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Water Science and Technology: a Journal of the International Association on Water Pollution Research

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https://read.qxmd.com/read/31070602/adsorption-of-cadmium-and-lead-in-wastewater-by-four-kinds-of-biomass-xanthates
#1
Wunan Li, Xiaoyong Liao, Lingqing Wang, Zhanbin Huang
This study determined the adsorption of Cd2+ and Pb2+ (100 mg·L-1 of each) in simulated wastewater by biomass xanthates made from starch, chitosan, wheat stalk and corn stalk. The results showed that the adsorption efficiency of Pb2+ and Cd2+ ions followed the order: corn stalk xanthate > wheat stalk xanthate ≥ chitosan xanthate > starch xanthate. The results of kinetic modeling showed that the adsorption process was characterized by physical-chemical adsorption, and that a second-order kinetics equation described the adsorption process well...
March 2019: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://read.qxmd.com/read/31070601/removal-of-chromium-vi-from-aqueous-solutions-using-diospyros-discolor-seed-activated-with-nitric-acid-isotherm-and-kinetic-studies
#2
Dian Arrisujaya, Nina Ariesta, Mamay Maslahat
No abstract text is available yet for this article.
March 2019: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://read.qxmd.com/read/31070600/high-rate-filtration-for-local-treatment-of-combined-sewer-overflow
#3
H Helness, C Sun, S Damman, M Ahmadi, G Raspati, V Bjerkelund, G Moldestad, K Hattori, T Kato, N Ando
Combined sewer overflows (CSOs) pollute receiving waters and have a negative impact on ecosystem services. In urban areas rehabilitation of the sewer system to avoid CSOs is associated with high investment costs. Furthermore, not all CSOs can be closed due to the need for hydraulic reliability of the system. Local treatment of CSO with high rate filtration offers an alternative to rehabilitation of the sewer system that is flexible with respect to design and has lower investment cost than separating sewage and storm water runoff...
March 2019: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://read.qxmd.com/read/31070599/optimization-and-mechanism-of-acid-orange-7-removal-by-powdered-activated-carbon-coupled-with-persulfate-by-response-surface-method
#4
Xuxu Wang, Xuebin Hu, Chun Zhao, Zhihua Sun, Huaili Zheng, Junfeng Li, Zhaoyang Wang
In this study, powder activated carbon (PAC) utilized to activate peroxydisulfate (PDS) was investigated for decolorization of Acid Orange 7 (AO7). The results indicated a remarkable synergistic effect in the PAC/PDS system. The effect of PAC, PDS dosages and initial pH on AO7 decolorization were studied and the processes followed first-order kinetics. Response surface method with central composite design (CCD) model was utilized to optimize these three factors and analyze the combined interaction. The optimum condition for the decolorization rate of AO7 was analyzed as the following: PAC (0...
March 2019: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://read.qxmd.com/read/31070598/decolorization-effect-and-related-mechanism-of-atmospheric-pressure-plasma-jet-on-eriochrome-black-t
#5
Xiaoyan Li, Jinren Liu, Yueming Wu, Lingge Gao, Yan Ma, Guimin Xu, Guoqiang Li, Longlong Zhang, Miao Li, Li You, Xingmin Shi, Wang Yuan
In this study, Eriochrome Black T (EBT) in water was decolorized by means of argon atmospheric pressure plasma jet (APPJ), which showed great decolorization performance. The results showed that the relatively high decolorization rate (approximately 80%) was obtained after plasma treatment for 6 min. Changes to some reactive oxygen and nitrogen species (RONS) in the liquid phase were detected. The contents of peroxide, HO·, O2 - ·, and NO· in the plasma-treated EBT solution were much less than those in the activated water...
March 2019: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://read.qxmd.com/read/31070597/effect-of-influent-ph-on-hydrolytic-acidification-performance-and-bacterial-community-structure-in-egsb-for-pretreating-crotonaldehyde-manufacture-wastewater-after-ozonation
#6
Tao Liu, Zhiqiang Shen, Chunyu Zhang, Yudong Song, Jie Li, Zongpu Yang, Guangqing Song, Zhenfeng Han, Yuexi Zhou
The objective of this work was to evaluate the effect of influent pH on the hydrolytic acidification (HA) performance and microbial community structure in an expanded granular sludge bed (EGSB) pretreating crotonaldehyde manufacture wastewater (CMW) after ozonation. The results showed that higher chemical oxygen demand (COD) removal rate (40.1%) and acidification degree (27.6%) were obtained at pH 8.0 than those at pH 6.0 and pH 4.0. The concentration of extractable extracellular polymeric substance (EPS) in the sludge gradually decreased with the pH decreasing from 8...
March 2019: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://read.qxmd.com/read/31070596/studies-on-the-reaction-mechanism-of-cu-sic-catalytic-oxidation-for-degradation-of-methyl-orange-in-presence-of-microwave
#7
Guotong Xia, Jie Sun, Wenjin Yang, Gao-Lin Wu, Weibo Shen
The removal of methyl orange (MO) in a copper-loaded silicon carbide (Cu/SiC) system under microwave (MW) irradiation was studied. Cu/SiC was synthesized by employing an impregnation method and the effects of parameters such as reaction time, catalyst dosage, hydrogen peroxide (H2 O2 ) dosage, microwave power and pH on the rate of degradation of MO were also studied. The obtained results showed that almost complete degradation was obtained in the presence of Cu/SiC catalyst within 8 min of irradiation when 100 mL of MO solution (20 mg/L), 3 ml/L of H2 O2 , 2 g/L of catalyst dose, 600 W of MW power, and pH 7 were applied...
March 2019: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://read.qxmd.com/read/31070595/influence-of-drainage-network-and-compensatory-techniques-on-urban-flooding-susceptibility
#8
Jakcemara Caprario, Aline Schuck Rech, Fabiane Andressa Tasca, Alexandra Rodrigues Finotti
Urban flooding due to accelerated urbanization and the resulting drainage problems have become a worldwide issue and the subject of several studies in recent decades. Alternative and holistic approaches such as sustainable drainage systems have been gaining prominence. Compensatory techniques represent one of these promising alternatives for managing flooding risk in the transition to regenerative urban environments. The goal of this study is to assess the effect of a drainage network together with compensatory techniques on the susceptibility to urban flooding in Campeche District...
March 2019: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://read.qxmd.com/read/31070594/a-simple-sensitivity-analysis-of-the-turbulence-induced-flocculation-model-of-cohesive-sediment
#9
Zhongfan Zhu
In this study, the local and global sensitivity analyses of the Winterwerp model to the input parameters have been carried out using the Garson algorithm and the PaD2 method by virtue of an artificial neural network. The main results of the sensitivity analyses are that the model is most sensitive to the breakup parameter and that only two parameters (the floc aggregation and breakup parameters) are significant. The result that the model output is less sensitive to the choice of fractal dimension seems to imply that the modification work on the fractal dimension might be unnecessary...
March 2019: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://read.qxmd.com/read/31070593/kinetic-study-of-dye-removal-using-tio-2-supported-on-polyethylene-terephthalate-by-advanced-oxidation-processes-through-neural-networks
#10
Ada Azevedo Barbosa, Ramon Vinicius Santos de Aquino, Naiana Santos da Cruz Santana Neves, Renato Falcão Dantas, Marta Maria Menezes Bezerra Duarte, Otidene Rossiter Sá da Rocha
This work investigated the efficiency of polyethylene terephthalate (PET) as support material for TiO2 films in the photocatalytic degradation of red Bordeaux and yellow tartrazine dyes. The optimum operating conditions were determined by a factorial design, which resulted after 180 min of treatment in degradations of 99.5% and 99.1% for the UVC/H2 O2 /TiO2Sup and solar/H2 O2 /TiO2Sup systems, respectively. For the kinetic study, the experimental data fitted to the pseudo-first-order model and the calculated kinetic constants (k) values were 0...
March 2019: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://read.qxmd.com/read/31070592/effects-of-different-substrates-on-microbial-electrolysis-cell-mec-anodic-membrane-biodiversity-and-hydrogen-production-performance
#11
Qiongli Shao, Jianchang Li, Sixia Yang, Helin Sun
To investigate the effects of different substrates on the biodiversity and hydrogen production performance of microbial electrolysis cell (MEC) anodic membranes, the vital electroactive microorganisms (e.g. in MEC hydrogen production) were worth identifying. In the present study, single-factor experiments were performed. Sodium acetate, sodium propionate, sodium butyrate, glucose and starch served as different substrates for MEC anodic culture experiments under the same condition. The effects of different substrates on the bioactivity, biomass and hydrogen production performance of MEC anodic films were analyzed...
March 2019: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://read.qxmd.com/read/31070591/decision-tree-dt-generalized-regression-neural-network-gr-and-multivariate-adaptive-regression-splines-mars-models-for-sediment-transport-in-sewer-pipes
#12
Mir Jafar Sadegh Safari
Sediment deposition in sewers and urban drainage systems has great effect on the hydraulic capacity of the channel. In this respect, the self-cleansing concept has been widely used for sewers and urban drainage systems design. This study investigates the bed load sediment transport in sewer pipes with particular reference to the non-deposition condition in clean bed channels. Four data sets available in the literature covering wide ranges of pipe size, sediment size and sediment volumetric concentration have been utilized through applying decision tree (DT), generalized regression neural network (GR) and multivariate adaptive regression splines (MARS) techniques for modeling...
March 2019: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://read.qxmd.com/read/31070590/environmental-and-economic-performance-evaluation-of-municipal-wastewater-treatment-plants-in-india-a-life-cycle-approach
#13
Sheetal Kamble, Anju Singh, Absar Kazmi, Markus Starkl
Life cycle assessment (LCA) was used to evaluate the environmental impacts associated with wastewater treatment plants (WWTPs). Moreover, an economic evaluation was also addressed using life cycle cost (LCC) approach. Emissions associated with electricity production for operating the WWTPs, emissions from the treated effluent and hazardous heavy metals emissions have been identified as the main contributors to the overall environmental impact. Among the WWTPs considered, soil biotechnology (SBT) obtained the lowest environmental impact in all the evaluated impact categories, except for eutrophication potential...
March 2019: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://read.qxmd.com/read/31070589/efficient-removal-of-hg-2-cd-2-and-pb-2-from-aqueous-solution-and-mixed-industrial-wastewater-using-a-designed-chelating-ligand-2-pyridyl-n-2-methylthiophenyl-methyleneimine-pmtpm
#14
Krishnendu Kumar Pobi, Biplab Mondal, Sumanta Nayek, Apurba K Patra, Rajnarayan Saha
The present study is focused on the removal of Hg2+ , Cd2+ and Pb2+ ions from aqueous solution using a tridentate chelating agent, 2-pyridyl-N-(2'-methylthiophenyl) methyleneimine (PMTPM); and applicability of such removal from industrial wastewater using PMTPM is also investigated. The results showed that the metal ions removal efficiency using PMTPM was in the order of Hg2+ (99.46%) > Cd2+ (95.42%) > Pb2+ (94.54%) under optimum reaction conditions (L:M2+ = 3:1, pH = 9, time = 24 h, temp. = 30 °C). Formed chelated complexes such as [Hg(PMTPM)Cl2 ] (1), [Cd(PMTPM)Cl2 ] (2) and [Pb(PMTPM)Cl2 ] (3) were characterized by numerous spectroscopic tools and X-ray structure determination of a representative complex of Hg2+ ...
March 2019: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://read.qxmd.com/read/31070588/the-effects-of-a-full-scale-anaerobic-side-stream-reactor-on-sludge-decay-and-biomass-activity
#15
V F Velho, G Andreottola, P Foladori, R H R Costa
A full-scale anaerobic side-stream reactor (ASSR) for sludge reduction was monitored in terms of sludge production and compared with the previous conventional activated sludge configuration (CAS). A detailed solid mass balance was calculated on the whole full-scale plant to estimate the sludge reduction associated with the ASSR. The activity of the biomass, which undergoes alternation of aerobic and anaerobic conditions, was investigated by the respirometric test. The ASSR promoted a reduction of heterotrophic biomass activity and the substrate consumption rate in the activated sludge implemented with ASSR (AS + ASSR) was 36% smaller than in the CAS period...
March 2019: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://read.qxmd.com/read/31070587/a-mediator-free-whole-cell-electrochemical-biosensing-system-for-sensitive-assessment-of-heavy-metal-toxicity-in-water
#16
Yuan Yang, Zhen Fang, Yang-Yang Yu, Yan-Zhai Wang, Saraschandra Naraginti, Yang-Chun Yong
A bioelectrochemical sensing system (BES) based on electroactive bacteria (EAB) has been used as a new and promising tool for water toxicity assessment. However, most EAB can reduce heavy metals, which usually results in low toxicity response. Herein, a starvation pre-incubation strategy was developed which successfully avoided the metal reduction during the toxicity sensing period. By integrating this starvation pre-incubation procedure with the amperometric BES, a sensitive, robust and mediator-free biosensing method for heavy metal toxicity assessment was developed...
March 2019: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://read.qxmd.com/read/31070586/the-impact-of-household-connection-to-public-network-wastewater-systems-regulatory-impact-assessment
#17
Bruno Eustaquio de Carvalho, Samuel Alves Barbi Costa, Rui Cunha Marques, Oscar Cordeiro Netto
Brazil faces a severe lack of wastewater coverage. Even in urban areas, wastewater is directly disposed of in watercourses without any treatment for a large part of the population. Although the federal, state, and local governments have invested in water and wastewater services (WWS), the expected results have not been achieved. To overcome this problem, the present paper provides an opportunity to observe an ex-ante regulatory impact assessment (RIA) as a policy tool in Brazil. The regulatory policy options will be appraised through the multiple criteria decision analysis (MCDA) according to the following objectives: (i) protect the customers with respect to social aspects; (ii) safeguard the economic, operational and infrastructure sustainability; and (iii) protect the environment...
March 2019: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://read.qxmd.com/read/31070585/on-the-performance-of-a-pilot-hybrid-constructed-wetland-for-stormwater-recovery-in-mediterranean-climate
#18
D Ventura, S Barbagallo, S Consoli, M Ferrante, M Milani, F Licciardello, G L Cirelli
The overall efficiency of a pilot-scale hybrid constructed wetland (H-CW), located on a retail store's parking area in Eastern Sicily, for alternative treatment of stormwater runoff and of sequential batch reactor (SBR) effluent was evaluated. Experimental activities were focused on system performances, including wastewater (WW) quality and hydraulic monitoring. System design, macrophyte growth and seasonal factors influenced the pilot plant performance. Very high removal efficiency for microbial indicators were reported within the subsurface horizontal flow unit (HF), playing a strategic role for Clostridium perfringens...
March 2019: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://read.qxmd.com/read/31070584/highly-efficient-and-selective-removal-of-tetracycline-from-aqueous-solutions-via-adsorption-onto-cu-ii-modified-hierarchical-zsm-5
#19
Subing Fan, Junmin Lv, Yulong Ma, Yaoyao Chen
Herein, we prepared Cu(II)-modified hierarchical ZSM-5 containing both micro- and mesopores by alkali treatment followed by ion exchange as an adsorbent, using it for tetracycline (TC) removal from aqueous solutions. The crystal structure, morphology, texture, and Si:Al ratio of this adsorbent by a range of instrumental techniques were investigated. Moreover, we studied the effect of pH and Cu(II) loading on adsorption performance and probed adsorption kinetics, thermodynamics and regeneration performance, revealing that modification of hierarchical ZSM-5 with Cu(II) not only significantly increased its TC removal efficiency but also allowed for good regenerability and suggested that the highly efficient and selective removal of TC from aqueous solutions could be ascribed to not only the strong interactions between Cu(II) and TC molecular but also the larger mesoporosity...
March 2019: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://read.qxmd.com/read/31070583/adsorptive-treatment-via-simultaneous-removal-of-copper-lead-and-zinc-from-soil-washing-wastewater-using-spent-coffee-grounds
#20
Cybelle M Futalan, Jongsik Kim, Jurng-Jae Yee
In the present work, the performance of spent coffee grounds (SCG) as an adsorbent in the treatment of real soil washing wastewater (SWW) was evaluated. Scanning electron microscopy, Fourier transform infrared spectroscopy, zeta potential measurement and Brunauer-Emmett-Teller analysis were utilized to determine the physicochemical characteristics of SCG. Maximum removal efficiency of 68.73% for Cu(II), 57.23% for Pb(II) and 84.55% for Zn(II) was attained at 2.5 g SCG, 300 min and 328 K. Error analysis was performed using root mean square error (RMSE) and sum of square error (SSE)...
March 2019: Water Science and Technology: a Journal of the International Association on Water Pollution Research
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