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学者姓名:周志伟

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Hydrodynamic solar-driven interfacial evaporation - Gone with the flow SCIE
期刊论文 | 2024 , 266 | WATER RESEARCH
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Abstract :

Evaporation has been one of the most classic desalination processes on the Earth. When we try to use the power of water flow itself, the evaporation process can perform even better. Here, we report a hydrodynamic solardriven interfacial evaporation process which water evaporation rate can achieve 6.58 kg & sdot;m(-2)& sdot;h(-1) (over 100 times higher than natural evaporation). A waterwheel-structure solar interfacial evaporator was designed and assembled by printed filter papers. The evaporator can both rapidly distribute solution on the evaporation interface and be hydraulically driven to rotate continuously to improve the evaporation rate by water flow. The hydrodynamic solar-driven interfacial evaporation process successfully overcomes the problem of slow diffusion of water vapor, but also realizes the day-and-night operation of process and the self-cleaning of salt fouling. Apart from the application in solar desalination, the developed evaporator has great potentials in vapor production and salt recovery for industrial use.

Keyword :

Salt fouling removal Salt fouling removal Day-and-night operation Day-and-night operation Hydrodynamic evaporation system Hydrodynamic evaporation system Ultra-high evaporation rate Ultra-high evaporation rate Dynamic solar-driven interfacial evaporation Dynamic solar-driven interfacial evaporation Waterwheel evaporator Waterwheel evaporator

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GB/T 7714 Ren, Jiawei , Xu, Jia , Tian, Shuangchao et al. Hydrodynamic solar-driven interfacial evaporation - Gone with the flow [J]. | WATER RESEARCH , 2024 , 266 .
MLA Ren, Jiawei et al. "Hydrodynamic solar-driven interfacial evaporation - Gone with the flow" . | WATER RESEARCH 266 (2024) .
APA Ren, Jiawei , Xu, Jia , Tian, Shuangchao , Shi, Ke , Gu, Tianyu , Zhao, Jiaheng et al. Hydrodynamic solar-driven interfacial evaporation - Gone with the flow . | WATER RESEARCH , 2024 , 266 .
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Ultrasonic-Thermal Regeneration of Spent Powdered Activated Carbon SCIE SSCI
期刊论文 | 2023 , 15 (11) | SUSTAINABILITY
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Abstract :

This study investigated the ultrasonic-thermal regeneration of powdered activated carbon (PAC) spent using 4-chlorophenol (4-CP). Similarly, a thermal regeneration process was also studied and the reaction conditions (i.e., regeneration temperature, heating rate, regeneration time) were tested. Fourier transform infrared spectroscopy (FT-IR), thermogravimetric analysis (TGA), scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS) and X-ray diffraction (XRD) analysis were applied to characterize the regenerated PACs under different treatments (thermal, ultrasonic and ultrasonic-thermal) and also compare them with the fresh and exhausted PACs. According to our regeneration observations, the ideal regeneration parameters were determined to be a 40 kHz frequency, 0.18 W/mL sonication power, 0.1 M NaOH and 50% (v/v) ethyl alcohol as the regeneration solution, and 1 g/L of saturated PAC mass with thermal regeneration as the second stage at 500 ?, desorbed for 30 min with a heating rate of 20 ? min(-1). Under these conditions, the RE value achieved 90.99% and the ? value reached 5.6%. The results of FTIR, XPS and XRD revealed that the oxygen functional group content of ultrasonic-thermal regenerated PAC significantly increased. These oxygenous groups exerted a positive effect on the adsorption process of the regenerated PAC and the subsequent adsorption-regeneration process.

Keyword :

characteristic characteristic powdered activated carbon powdered activated carbon thermal thermal ultrasonic ultrasonic regeneration regeneration

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GB/T 7714 Zhang, Tingting , Yang, Yanling , Li, Xing et al. Ultrasonic-Thermal Regeneration of Spent Powdered Activated Carbon [J]. | SUSTAINABILITY , 2023 , 15 (11) .
MLA Zhang, Tingting et al. "Ultrasonic-Thermal Regeneration of Spent Powdered Activated Carbon" . | SUSTAINABILITY 15 . 11 (2023) .
APA Zhang, Tingting , Yang, Yanling , Li, Xing , Zhou, Zhiwei , Wei, Bigui . Ultrasonic-Thermal Regeneration of Spent Powdered Activated Carbon . | SUSTAINABILITY , 2023 , 15 (11) .
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Enhanced permeation performance of biofiltration-facilitated gravity-driven membrane (GDM) systems by in-situ application of UV and VUV: Comprehensive insights from thermodynamic and multi-omics perspectives SCIE
期刊论文 | 2023 , 242 | WATER RESEARCH
WoS CC Cited Count: 7
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Abstract :

Biofouling is a major challenge limiting the practical application of biofiltration-facilitated gravity-driven membrane (GDM) systems in drinking water treatment. In this study, ultraviolet irradiation, including ultraviolet (UV) and vacuum ultraviolet (VUV) irradiation, was used for in-situ purification of membrane tanks to control membrane biofouling. After using UV and VUV, the permeate flux increased significantly by 26.1% and 78.3%, respectively, which was mainly due to the decreased cake layer resistance (Rc). The permeability of the biofouling layer improved after UV and VUV application, as evidenced by the increased surface porosity and decreased thickness. The contents of loosely bound extracellular proteins (LB-PN) and tightly bound extracellular proteins (TB-PN) in the biofouling layer were reduced after UV and VUV irradiation. The decreased LB-PN and TB-PN improved the interfacial free energy between the fouling itself and between the fouling and the membrane, which contributed to the reduction of interfacial cohesion and adhesion, resulting in a looser and thinner biofouling layer and a cleaner membrane. The concentration of protein-like material in the membrane tank decreased after UV and VUV irradiation, significantly altering the bacterial community structure on the membrane surface (Mantel's r > 0.7, p < 0.05). The changes in the metabolic state were responsible for the differences in the LB-PN and TB-PN contents. The inhibition of "Alanine, aspartate and glutamate metabolism" and "Glycine, serine and threonine metabolism" reduced amino acid biosynthesis, which restricted the secretion of LB-PN and TB-PN. Critical genera in the Proteobacteria phylum, such as Hirschia, Rhodobacter, Nordella, Candidatus_Berkiella, and Limnohabitans, were involved in metabolite transformation. Overall, the in-situ application of UV and VUV can be an effective alternative strategy to mitigate membrane biofouling, which would facilitate the practical application of biofiltration-facilitated GDM systems in drinking water treatment.

Keyword :

Metabolic pathway Metabolic pathway Gravity-driven membrane (GDM) Gravity-driven membrane (GDM) Ultraviolet (UV) Ultraviolet (UV) Interface free energy Interface free energy Extracellular polymeric substances (EPS) Extracellular polymeric substances (EPS) Vacuum ultraviolet (VUV) Vacuum ultraviolet (VUV)

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GB/T 7714 Feng, Jianyong , Li, Xing , Lu, Zedong et al. Enhanced permeation performance of biofiltration-facilitated gravity-driven membrane (GDM) systems by in-situ application of UV and VUV: Comprehensive insights from thermodynamic and multi-omics perspectives [J]. | WATER RESEARCH , 2023 , 242 .
MLA Feng, Jianyong et al. "Enhanced permeation performance of biofiltration-facilitated gravity-driven membrane (GDM) systems by in-situ application of UV and VUV: Comprehensive insights from thermodynamic and multi-omics perspectives" . | WATER RESEARCH 242 (2023) .
APA Feng, Jianyong , Li, Xing , Lu, Zedong , Yang, Yanling , Zhou, Zhiwei , Liang, Heng . Enhanced permeation performance of biofiltration-facilitated gravity-driven membrane (GDM) systems by in-situ application of UV and VUV: Comprehensive insights from thermodynamic and multi-omics perspectives . | WATER RESEARCH , 2023 , 242 .
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Role of visible light photocatalysis in alleviation and mechanism transformation of ultrafiltration membrane fouling caused by natural organic matter SCIE
期刊论文 | 2023 , 324 | SEPARATION AND PURIFICATION TECHNOLOGY
WoS CC Cited Count: 3
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Abstract :

In this study, a novel composite based on bismuth oxide, reduced graphene oxide and titanium dioxide (labeled as BRGT) was utilized for visible light photocatalysis to mitigate ultrafiltration membrane fouling caused by natural organic matter (NOM). The results show that the coexistence of NOM and the BRGT composite (without photocatalysis) did not aggravate membrane fouling, and the membrane preferentially retained a high molecular weight, hydrophobic component of NOM that formed a dense cake layer with BRGT composite. As the photo-catalysis time increased, the extent of membrane fouling was alleviated. The maximum specific flux recovered from 0.21 to 0.73 at 60 min, and the hydraulic reversible and irreversible resistances ere 1.15 x 1010 and 4.23 x 1010 m-1, respectively. The reduction of NOM in the feed water, especially the removal of UV254, played a significant role in the alleviation of membrane fouling. Additionally, the changes in the properties of NOM, including the reduction of fluorescent humic and protein/polyphenol components corresponding to reversible and irreversible fouling, respectively, the photo-degradation of high molecular weight NOM into low molecular weight NOM (such as low molecular weight-acids), and the conversion of hydrophobic fractions into hydrophilic fractions, contributed to the mitigation of membrane fouling. We also found a strong negative correlation be-tween the roughness of the cake layer and irreversible fouling. Overall, the changes in the properties of NOM in feed water can hinder or even inhibit the formation of the cake layer, and the use of visible light photocatalysis of the BRGT composite has great potential to alleviate ultrafiltration membrane fouling caused by natural organic matter.

Keyword :

Mechanism of fouling development Mechanism of fouling development Fouling mitigation Fouling mitigation Ultrafiltration Ultrafiltration Natural organic matter Natural organic matter Visible light photocatalysis Visible light photocatalysis

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GB/T 7714 Yu, Rui , Yang, Yanling , Zhou, Zhiwei et al. Role of visible light photocatalysis in alleviation and mechanism transformation of ultrafiltration membrane fouling caused by natural organic matter [J]. | SEPARATION AND PURIFICATION TECHNOLOGY , 2023 , 324 .
MLA Yu, Rui et al. "Role of visible light photocatalysis in alleviation and mechanism transformation of ultrafiltration membrane fouling caused by natural organic matter" . | SEPARATION AND PURIFICATION TECHNOLOGY 324 (2023) .
APA Yu, Rui , Yang, Yanling , Zhou, Zhiwei , Li, Xing , Liu, Chunjiao , Sun, Tianjie . Role of visible light photocatalysis in alleviation and mechanism transformation of ultrafiltration membrane fouling caused by natural organic matter . | SEPARATION AND PURIFICATION TECHNOLOGY , 2023 , 324 .
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Fate of sulfamerazine by synchronous adsorption and photocatalysis dependent on natural organic matter properties SCIE
期刊论文 | 2023 , 45 (18) , 3635-3647 | ENVIRONMENTAL TECHNOLOGY
WoS CC Cited Count: 1
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Abstract :

Natural organic matter (NOM) can impede the removal of organic micro-pollutants (OMPs) through several mechanisms, including inner filter effect, competition with the target OMP, and radical scavenging, during synchronous adsorption/photocatalysis of multi-functional composites. In this study, the fate and inhibitory mechanisms of sulfamerazine (SMZ, a model OMP) that occurred in presence of seven different NOM samples (i.e. three standard NOM surrogates, a river water sample, a carbon filter effluent and two different sand filter effluents) during the adsorption/photocatalysis by a composite of Bi2O3-TiO2 supported on powdered activated carbon (Bi2O3-TiO2/PAC, abbreviated as BTP) when exposed to visible light irradiation were revealed. The results indicated that adsorption played a greater attribution than photocatalysis on SMZ removal. The primary impediment to the adsorption and photocatalytic degradation of SMZ was attributed to the presence of terrestrial-derived, humic-like NOM fractions with high aromaticity. The adsorption efficacy of SMZ was weakened by the absorption of NOM and its degradation products onto the BTP surface. The inner filter effect, competition between NOM and SMZ, and radical scavenging were responsible for the reduced photocatalysis of SMZ. In the cases of real water matrices, the presence of inorganic anion and co-existed NOM reduced the removal of SMZ. In summary, the findings of this work offer a comprehensive comprehension of the impact of NOM fractions on photocatalysis, emphasizing the necessity to examine the interplay between NOM and background inorganic constituents in the degradation of OMP via adsorption/photocatalysis.

Keyword :

inhibition inhibition Bi2O3-TiO2 Bi2O3-TiO2 PAC composite PAC composite multi-functional composite multi-functional composite natural organic matter natural organic matter adsorption and photocatalysis adsorption and photocatalysis

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GB/T 7714 Zhou, Zhiwei , Zhang, Ruixin , Yang, Yanling et al. Fate of sulfamerazine by synchronous adsorption and photocatalysis dependent on natural organic matter properties [J]. | ENVIRONMENTAL TECHNOLOGY , 2023 , 45 (18) : 3635-3647 .
MLA Zhou, Zhiwei et al. "Fate of sulfamerazine by synchronous adsorption and photocatalysis dependent on natural organic matter properties" . | ENVIRONMENTAL TECHNOLOGY 45 . 18 (2023) : 3635-3647 .
APA Zhou, Zhiwei , Zhang, Ruixin , Yang, Yanling , Li, Xing , Ren, Jiawei . Fate of sulfamerazine by synchronous adsorption and photocatalysis dependent on natural organic matter properties . | ENVIRONMENTAL TECHNOLOGY , 2023 , 45 (18) , 3635-3647 .
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Reduction of fouling of gravity-driven membrane by combined treatment of persulphate/nanoscale zero-valent iron/ultraviolet and dynamic dual coagulant flocs layer SCIE
期刊论文 | 2023 , 45 (17) , 3405-3417 | ENVIRONMENTAL TECHNOLOGY
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In this study, persulphate and nanoscale zero-valent iron were activated by ultraviolet irradiation (PS/nZVI/UV), followed by formation of dynamic flocs with AlCl3-TiCl4 coagulant directly injected into a gravity-driven membrane (GDM) tank. Membrane fouling caused by typical organic matter fractions including humic acid (HA), HA together with bovine serum albumin (HA-BSA), HA combined with polysaccharide (HA-SA) and the HA-BSA-SA mixture at pH of 6.0, 7.5 and 9.0 were evaluated by specific flux and fouling resistance distribution. The results showed that GDM pre-layered with AlCl3-TiCl4 flocs exhibited the maximum specific flux, followed by AlCl3 and TiCl4. Pre-oxidation with 0.5 mM PS and 0.1 g nZVI under UV radiation for 20 min was beneficial to degrade HA and SA fraction with molecular weight >100 kDa and <30 kDa, and BSA fraction with <30 kDa. The presence of BSA attributed mostly to irreversible fouling, SA together with BAS could exacerbate irreversible fouling, while HA caused the least fouling. The irreversible resistance of a PS/nZVI/UV-GDM system was 62.79%, 27.27%, 58.03% and 49.68% lower than that of control GDM in the treatment of HA, HA-BSA, HA-SA and HA-BSA-SA, respectively. The PS/nZVI/UV-GDM system could achieve the highest foulants removal efficiency at pH of 6.0. Morphological observations confirmed the differences in biofouling layers in different water types. Over 30-day operation, the bacterial genera on the biofouling layer could affect the organic removals, while the type of organic matter that was present influenced the relative abundance of bacterial genera.

Keyword :

Gravity-driven membrane Gravity-driven membrane nanoscale zero-valent iron nanoscale zero-valent iron flocs layer flocs layer biofouling layer biofouling layer ultraviolet (PS ultraviolet (PS nZVI nZVI persulphate persulphate NOM fractions NOM fractions UV) UV)

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GB/T 7714 Zhao, Fuwang , Zhou, Zhiwei , Du, Peng et al. Reduction of fouling of gravity-driven membrane by combined treatment of persulphate/nanoscale zero-valent iron/ultraviolet and dynamic dual coagulant flocs layer [J]. | ENVIRONMENTAL TECHNOLOGY , 2023 , 45 (17) : 3405-3417 .
MLA Zhao, Fuwang et al. "Reduction of fouling of gravity-driven membrane by combined treatment of persulphate/nanoscale zero-valent iron/ultraviolet and dynamic dual coagulant flocs layer" . | ENVIRONMENTAL TECHNOLOGY 45 . 17 (2023) : 3405-3417 .
APA Zhao, Fuwang , Zhou, Zhiwei , Du, Peng , Li, Xing , Lu, Qingxuan . Reduction of fouling of gravity-driven membrane by combined treatment of persulphate/nanoscale zero-valent iron/ultraviolet and dynamic dual coagulant flocs layer . | ENVIRONMENTAL TECHNOLOGY , 2023 , 45 (17) , 3405-3417 .
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Role of biological granular activated carbon in contaminant removal and ultrafiltration membrane performance in a full-scale system SCIE
期刊论文 | 2022 , 644 | JOURNAL OF MEMBRANE SCIENCE
WoS CC Cited Count: 11
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This study evaluated a long-term impact of biological activated carbon (BAC) filter that was employed in a fullscale drinking water treatment plant to enhance the removal of contaminants by the ultrafiltration (UF) process. The results showed that BAC enhanced UF performance by increasing the flux by 18.5% and extending the filtration run by 45%. The presence of BAC improved the removal of primary contaminants, including dissolved organic carbon (4-40%), UV254 (10-57.7%), geosmin and 2-methylisoborneol (80%). BAC was also effective in decreasing the concentration of biopolymers, humic substances, (semi-)volatile organics, chlorite and halonitromethanes, thereby lowering contaminant load on the UF unit. The changes in primary water quality parameters in the combined process showed that the humic substances in dissolved organic nitrogen, low molecular weight substances in UV254, and fluorescence protein-like substances could be useful indicators for DBPs as these organic fractions had strong correlation with DBPs. Obvious spatio-temporal characteristics of GAC grain and microbial communities in BAC filter were observed with operation time and filter depth. The bacterial community in BAC filter was highly diverse and was less influenced by influent quality with an increase in filter depth, while the communities in UF cake layer correlated with organic removal in the UF system.

Keyword :

Ultrafiltration Ultrafiltration Bacterial community Bacterial community Biological activated carbon (BAC) Biological activated carbon (BAC) Disinfection byproduct formation potential (DBPFP) Disinfection byproduct formation potential (DBPFP) Organic fractions Organic fractions

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GB/T 7714 Chang, Haiqing , Yu, Haikuan , Li, Xing et al. Role of biological granular activated carbon in contaminant removal and ultrafiltration membrane performance in a full-scale system [J]. | JOURNAL OF MEMBRANE SCIENCE , 2022 , 644 .
MLA Chang, Haiqing et al. "Role of biological granular activated carbon in contaminant removal and ultrafiltration membrane performance in a full-scale system" . | JOURNAL OF MEMBRANE SCIENCE 644 (2022) .
APA Chang, Haiqing , Yu, Haikuan , Li, Xing , Zhou, Zhiwei , Liang, Heng , Song, Wuchang et al. Role of biological granular activated carbon in contaminant removal and ultrafiltration membrane performance in a full-scale system . | JOURNAL OF MEMBRANE SCIENCE , 2022 , 644 .
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Regulated-biofilms enhance the permeate flux and quality of gravity-driven membrane (GDM) by in situ coagulation combined with activated alumina filtration SCIE
期刊论文 | 2022 , 209 | WATER RESEARCH
WoS CC Cited Count: 22
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Abstract :

It is a critical challenge for drinking water production when treating algae-contaminated surface water. In this study, the impact of in situ coagulation (C), activated alumina filtration (AA) and their combination (CAA) on the performance of gravity-driven membrane (GDM) was systematically assessed during 105-day operation. The results indicated that pretreatments in particular CAA could effectively enhance GDM flux, and the stable fluxes were increased to 3.1, 4.9 and 8.3 L/(m(2).h) (LMH) for CGDM, AA/GDM and CAA/GDM, respectively when compared to the control GDM (2.0 LMH). Coagulation was beneficial to formation of thick but loose biofouling layer, while AA filtration was effective to retain foulants including extracellular polymeric substances (EPS), organics, total nitrogen and total phosphorus. The CAA/GDM could mostly remove these foulants, and facilitate the proliferation of bacterial genera that could consume EPS, further alleviating membrane fouling. The dif-ference in loosely bound EPS and tightly bound EPS of biofouling layer attributed to the difference of reversible fouling and irreversible fouling, respectively. Morphological observations, variation in functional groups or el-ements further confirmed the difference in biological layers in different GDM systems. The occurrence of specific bacterial genera involving the potential to degrade protein, chitin and other high molecular weight organics was responsible for contaminant removals.

Keyword :

In situ coagulation In situ coagulation Biofouling layer Biofouling layer Gravity-driven membrane (GDM) Gravity-driven membrane (GDM) Flux stabilization Flux stabilization Bacterial community Bacterial community Extracellular polymeric substances (EPS) Extracellular polymeric substances (EPS)

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GB/T 7714 Du, Peng , Li, Xing , Yang, Yanling et al. Regulated-biofilms enhance the permeate flux and quality of gravity-driven membrane (GDM) by in situ coagulation combined with activated alumina filtration [J]. | WATER RESEARCH , 2022 , 209 .
MLA Du, Peng et al. "Regulated-biofilms enhance the permeate flux and quality of gravity-driven membrane (GDM) by in situ coagulation combined with activated alumina filtration" . | WATER RESEARCH 209 (2022) .
APA Du, Peng , Li, Xing , Yang, Yanling , Zhou, Zhiwei , Fan, Xiaoyan , Chang, Haiqing et al. Regulated-biofilms enhance the permeate flux and quality of gravity-driven membrane (GDM) by in situ coagulation combined with activated alumina filtration . | WATER RESEARCH , 2022 , 209 .
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Long-term fouling evolution of polyvinyl chloride ultrafiltration membranes in a hybrid short-length sedimentation/ ultrafiltration process for drinking water production SCIE
期刊论文 | 2021 , 630 | JOURNAL OF MEMBRANE SCIENCE
WoS CC Cited Count: 2
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Despite the rapid increase of ultrafiltration (UF) membranes in water treatment, the UF performance in largescale drinking water treatment plants (DWTPs) in long-term operation has not been well understood. This study was carried out to investigate the fouling evolution of two types of polyvinyl chloride (PVC) hollow fiber UF membranes in a hybrid coagulation/short-length sedimentation/UF process. Water quality analysis showed that safe drinking water could be produced in the life time (i.e., 5 years) of the UF membranes. The fractions with large molecular weight (e.g., biopolymers), microbial by-product and aromatic protein II in raw water were easily removed, and the formation potentials of most disinfection by-products except trihalomethanes were found to decrease in the DWTP. Constant filtration fluxes were maintained for both types of UF membranes, while PVC composite membranes exhibited higher anti-fouling properties than PVC alloy membranes. The key fouling factors varied with operation time, and the top three factors were hydraulically cleaning efficiency, temperature and chemical oxygen demand using statistical analyses. Finally, the evolution model of membrane fouling in the first 5-year with potential fouling factors was established using artificial neural network, and membrane fouling of another year was predicted after UF membranes were replaced with new ones.

Keyword :

Fouling prediction Fouling prediction Statistical analysis Statistical analysis Polyvinyl chloride membranes Polyvinyl chloride membranes Ultrafiltration Ultrafiltration Short-length sedimentation Short-length sedimentation

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GB/T 7714 Yu, Haikuan , Chang, Haiqing , Li, Xing et al. Long-term fouling evolution of polyvinyl chloride ultrafiltration membranes in a hybrid short-length sedimentation/ ultrafiltration process for drinking water production [J]. | JOURNAL OF MEMBRANE SCIENCE , 2021 , 630 .
MLA Yu, Haikuan et al. "Long-term fouling evolution of polyvinyl chloride ultrafiltration membranes in a hybrid short-length sedimentation/ ultrafiltration process for drinking water production" . | JOURNAL OF MEMBRANE SCIENCE 630 (2021) .
APA Yu, Haikuan , Chang, Haiqing , Li, Xing , Zhou, Zhiwei , Song, Wuchang , Ji, Hongjie et al. Long-term fouling evolution of polyvinyl chloride ultrafiltration membranes in a hybrid short-length sedimentation/ ultrafiltration process for drinking water production . | JOURNAL OF MEMBRANE SCIENCE , 2021 , 630 .
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Modeling and optimizing of NH4+ removal from stormwater by coal-based granular activated carbon using RSM and ANN coupled with GA EI
期刊论文 | 2021 , 13 (5) | Water (Switzerland)
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Abstract :

As a key parameter in the adsorption process, removal rate is not available under most operating conditions due to the time and cost of experimental testing. To address this issue, evaluation of the efficiency of NH4+ removal from stormwater by coal-based granular activated carbon (CB-GAC), a novel approach, the response surface methodology (RSM), back-propagation artificial neural network (BP-ANN) coupled with genetic algorithm (GA), has been applied in this research. The sorption process was modeled based on Box-Behnben design (BBD) RSM method for independent variables: Contact time, initial concentration, temperature, and pH; suggesting a quadratic polynomial model with p-value 2 = 0.9762. The BP-ANN with a structure of 4-8-1 gave the best performance. Compared with the BBD-RSM model, the BP-ANN model indicated better prediction of the response with R2 = 0.9959. The weights derived from BP-ANN was further analyzed by Garson equation, and the results showed that the order of the variables’ effectiveness is as follow: Contact time (31.23%) > pH (24.68%) > temperature (22.93%) > initial concentration (21.16%). The process parameters were optimized via RSM optimization tools and GA. The results of validation experiments showed that the optimization results of GA-ANN are more accurate than BBD-RSM, with contact time = 899.41 min, initial concentration = 17.35 mg/L, temperature = 15 °C, pH = 6.98, NH4+ removal rate = 63.74%, and relative error = 0.87%. Furthermore, the CB-GAC has been characterized by Scanning electron microscopy (SEM), X-ray diffraction (XRD) and Brunauer-Emmett-Teller (BET). The isotherm and kinetic studies of the adsorption process illustrated that adsorption of NH4+ onto CB-GAC corresponded Langmuir isotherm and pseudo-second-order kinetic models. The calculated maximum adsorption capacity was 0.2821 mg/g. © 2021 by the authors. Licensee MDPI, Basel, Switzerland.

Keyword :

Storms Storms Genetic algorithms Genetic algorithms Granular materials Granular materials Backpropagation Backpropagation Scanning electron microscopy Scanning electron microscopy Isotherms Isotherms Neural networks Neural networks Kinetic theory Kinetic theory Activated carbon Activated carbon Adsorption Adsorption

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GB/T 7714 Yu, Aixin , Liu, Yuankun , Li, Xing et al. Modeling and optimizing of NH4+ removal from stormwater by coal-based granular activated carbon using RSM and ANN coupled with GA [J]. | Water (Switzerland) , 2021 , 13 (5) .
MLA Yu, Aixin et al. "Modeling and optimizing of NH4+ removal from stormwater by coal-based granular activated carbon using RSM and ANN coupled with GA" . | Water (Switzerland) 13 . 5 (2021) .
APA Yu, Aixin , Liu, Yuankun , Li, Xing , Yang, Yanling , Zhou, Zhiwei , Liu, Hongrun . Modeling and optimizing of NH4+ removal from stormwater by coal-based granular activated carbon using RSM and ANN coupled with GA . | Water (Switzerland) , 2021 , 13 (5) .
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