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wastewater treatment

Edna M S Oliveira, Francisco R Silva, Crislânia C O Morais, Thiago Mielle B F Oliveira, Carlos A Martínez-Huitle, Artur J Motheo, Cynthia C Albuquerque, Suely S L Castro
This study investigated the anodic oxidation of phenolic wastewater generated by cashew-nut processing industry (CNPI) using active (Ti/RuO2 -TiO2 ) and inactive (boron doped diamond, BDD) anodes. During electrochemical treatment, various operating parameters were investigated, such as current density, chemical oxygen demand (COD), total phenols, O2 production, temperature, pH, as well as current efficiency and energy consumption. After electrolysis under optimized working conditions, samples were evaluated by chromatography and toxicological tests against L...
February 9, 2018: Chemosphere
Mahfuza Mubarak, Hyokyung Jeon, Md Shahinul Islam, Cheolho Yoon, Jong-Seong Bae, Seong-Ju Hwang, Won San Choi, Ha-Jin Lee
Herein, Mg/Fe layered double hydroxide (MF-LDH) hollow nanospheres were successfully prepared by a one-step thermal method. After the thermal treatment of MF-LDH nanospheres at 400 °C, the MF-LDH was converted into the corresponding oxide, Mg/Fe layered double oxide (MF-LDO), which maintained the hollow nanosphere structure. The MF-LDO hollow nanospheres exhibited excellent adsorption efficiency for both As(V) and Cr(VI), showing 99% removal within 5 min and providing maximum removal capacities of 178...
March 6, 2018: Chemosphere
Jin-Na Zhang, Guang-Guo Ying, Yuan-Yuan Yang, Wang-Rong Liu, Shuang-Shuang Liu, Jun Chen, You-Sheng Liu, Jian-Liang Zhao, Qian-Qian Zhang
Androgens are one class of steroids that could cause endocrine disrupting effects in aquatic organisms. However, little information is available about androgens in wastewater treatment plants (WWTPs) with different treatment technologies. Here we investigated the occurrence, removal, and fate of fourteen natural and synthetic androgens in ten WWTPs of Guangdong province, south China. The results showed detection of ten androgens in the influents of the ten WWTPs, with concentrations up to 4650 ng/L (androsta-1,4-diene-3,17-dione)...
February 26, 2018: Chemosphere
Jiade Wang, Tian Zhang, Yu Mei, Bingjun Pan
Reverse osmosis concentrate (ROC) of printing and dyeing wastewater remains as a daunting environmental issue, which is characterized by high salinity, chemical oxygen demand (COD), chroma and low biodegradability. In this study electro-oxidation process (PbO2 /Ti electrode) coupled with oxidation-reduction potential (ORP) online monitor was applied to treat such a ROC effluent. The results show that with the increase of specific electrical charge (Qsp ), the removal efficiencies of COD, TN and chroma increased significantly at the incipience and then reached a gentle stage; the optimal total current efficiency (12...
March 8, 2018: Chemosphere
Ya'nan Liu, Na Liu, Yuning Chen, Weifeng Zhang, Ruixiang Qu, Qingdong Zhang, Tzungyu-Shih, Lin Feng, Yen Wei
Food waste water is one of the most urgent environmental problems for the close connection between food and our daily life. Herein, we use a simple hydrothermal method to prepare a highly efficient catalyst-CeO2 /Co3 O4 compound on the stainless steel mesh, aiming for food waste water treatment. Possessing the superhydrophilic property and catalytic ability under ultraviolet light, CeO2 /Co3 O4 coated mesh has successfully processed three representative contaminants in food wastewater, which are soybean oil (food oil), AR (food dye) and VA (food flavor) simultaneously with an one-step filtration...
March 9, 2018: Water Research
Christine Prouty, Shima Mohebbi, Qiong Zhang
Given the increasing vulnerability of communities to the negative impacts of untreated wastewater, resource recovery (RR) systems provide a paradigm shift away from a traditional approach of waste separation and treatment towards a productive recovery of water, energy and nutrients. The aim of this research is to understand the relationships between factors that influence the adoption and sustainability of wastewater-based RR systems to inform technology implementation strategies. The study presents a theory-informed, community-influenced system dynamics (SD) model to provide decision-makers with an adaptable tool that simulates system-level responses to the strategies that are developed for the coastal town of Placencia, Belize...
March 7, 2018: Water Research
Jianliang Sun, Lianghai Li, Guangying Zhou, Xue Wang, Liang Zhang, Yueping Liu, Jierui Yang, Xianghong Lü, Feng Jiang
The conventional flue gas treatment technologies require high capital investments and chemical costs, which limit their application in industrial sectors. This study developed a sulfur-cycling technology to integrate sulfide production by biological sulfur reduction and simultaneous catalytic desulfurization and denitrification with H2 S (H2 S-SCDD) for flue gas treatment and sulfur recovery. In a packed bed reactor, high-rate sulfide production (1.63 ± 0.16 kg S/m3 -d) from biological sulfur reduction was achieved using organics in wastewater as electron donors at pH around 5...
March 16, 2018: Environmental Science & Technology
Bo Zhang, Quanwei Yu, Guoqi Yan, Hubo Zhu, Xiang Yang Xu, Liang Zhu
To understand the seasonal variation of the activated sludge (AS) bacterial community and identify core microbes in different wastewater processing systems, seasonal AS samples were taken from every biological treatment unit within 4 full-scale wastewater treatment plants. These plants adopted A2/O, A/O and oxidation ditch processes and were active in the treatment of different types and sources of wastewater, some domestic and others industrial. The bacterial community composition was analyzed using high-throughput sequencing technology...
March 15, 2018: Scientific Reports
Ande Rostvall, Wen Zhang, Wiebke Dürig, Gunno Renman, Karin Wiberg, Lutz Ahrens, Pablo Gago-Ferrero
This study evaluated the performance of five different sorbents (granular activated carbon (GAC), GAC + Polonite® (GAC + P), Xylit, lignite and sand) for a set of 83 micropollutants (MPs) (pharmaceuticals, perfluoroalkyl substances (PFASs), personal care products, artificial sweeteners, parabens, pesticide, stimulants), together representing a wide range of physicochemical properties. Treatment with GAC and GAC + P provided the highest removal efficiencies, with average values above 97%. Removal rates were generally lower for Xylit (on average 74%) and lignite (on average 68%), although they proved to be highly efficient for a few individual MPs...
March 6, 2018: Water Research
Eloi Parladé, Andrea Hom-Diaz, Paqui Blánquez, Maira Martínez-Alonso, Teresa Vicent, Nuria Gaju
The use of microalgal consortia for urban wastewater treatment is an increasing trend, as it allows simultaneous nutrient removal and biomass production. Emerging contaminants proposed for the list of priority substances such as the hormone 17β-estradiol are commonly found in urban wastewater, and their removal using algal monocultures has been accomplished. Due to the inherent potential of algae-based systems, this study aimed to assess the capability of native photobioreactor biomass to remove 17β-estradiol under indoor and outdoor conditions...
March 3, 2018: Water Research
Pavel Šauer, Alžběta Stará, Oksana Golovko, Olga Valentová, Adam Bořík, Roman Grabic, Hana Kocour Kroupová
Vast numbers of xenobiotics are known still to be present in treated municipal wastewater treatment plant (WWTP) effluents. Some of these possess endocrine-disrupting potency and pose risks for exposed aquatic animals. We searched for 17 potential environmental contaminants having affinity to the progesterone receptor. Relative potency values of these progesterone receptor-active chemicals were obtained. On the basis of relative potencies and measured environmental concentrations, the contribution of progestins to measured progestagenic activities was evaluated...
March 2, 2018: Water Research
Rodrigo de Abreu Domingos, Fabiana Valéria da Fonseca
The oil refinery industry seeks solutions to reduce its water uptake and consumption by encouraging the reuse of internal streams and wastewater from treatment systems. After conventional treatment the petroleum refinery wastewater still contains a considerable quantity of recalcitrant organics and the adsorption on activated carbon is currently used in Brazilian refineries, although it is still expensive due to the difficulty of its regeneration. This study evaluated the use of adsorbent and ion exchange resins for the removal of organic matter from refinery wastewater after conventional treatment in order to verify its feasibility, applying successive resin regenerations and comparing the results with those obtained for activated carbon process...
March 12, 2018: Journal of Environmental Management
Pengfei Guo, Yuejin Zhang, Yongjun Zhao
Abstract : Co-cultivation of microalgae and microbes for pollutant removal from sewage is considered as an effective wastewater treatment method. The aim of this study is to screen the optimal photoperiod, light intensity and microalgae co-cultivation method for simultaneously removing nutrients in biogas slurry and capturing CO₂ in biogas. The microalgae-fungi pellets are deemed to be a viable option because of their high specific growth rate and nutrient and CO2 removal efficiency under the photoperiod of 14 h light:10 h dark...
March 15, 2018: International Journal of Environmental Research and Public Health
Sahar Dalahmeh, Sana Tirgani, Allan John Komakech, Charles B Niwagaba, Lutz Ahrens
Occurrence and concentrations of 26 per- and polyfluoroalkyl substances (PFASs) were evaluated in wastewater, surface water, soil and crop plants (yam (Dioscorea spp.), maize (Zea mays) and sugarcane (Saccharum officinarum)) in Nakivubo wetland and Lake Victoria at Kampala, Uganda. ∑PFAS concentrations in effluent from Bugolobi wastewater treatment plant (WWTP) were higher (5.6-9.1ngL-1 ) than in the corresponding influent (3.4-5.1ngL-1 ), indicating poor removal of PFASs within the WWTP. ∑PFAS concentrations decreased by a factor of approximately five between Nakivubo channel (8...
March 11, 2018: Science of the Total Environment
Zheng-Zhe Zhang, Ya-Fei Cheng, Lian-Zeng-Ji Xu, Yu-Hui Bai, Ren-Cun Jin
The increasing use of engineered Ag nanoparticles (NPs) in consumer products raises great concerns about their environmental impacts, but their potential impact on anaerobic ammonium oxidation (anammox) bacteria in wastewater treatment remains unclear. In this study, the response of anammox consortia inhabiting in granules to long-term exposure of AgNPs was investigated. The gradually increased stress of AgNPs (1, 10, 50 mg L-1 ) showed no adverse effects on the nitrogen removal performance and on the relative abundance of Ca...
March 7, 2018: Bioresource Technology
Pei Biao, Chen Junjie, Liu Peng, He Tao, Li Xuemei, Zhang Lin
Generally, conventional polyamide reverse osmosis (RO) membranes suffer from a low water flux and serious oil pollution in the treatment of oil saline wastewater. Here, a novel RO membrane was successfully fabricated with hyperbranched polyamidoamine (PAMAM) and trimesoyl chloride (TMC) by interfacial reaction on polysulfone ultrafiltration membrane surface. The relatively smooth and thin PAMAM and TMC crosslinking active layer on the substrate membrane endowed the composite membrane with an excellent separation performance and remarkable anti-fouling performance simultaneously...
March 14, 2018: Environmental Technology
Pilar Mañas, Jorge de Las Heras
BACKGROUND: The objective of the study was to: firstly evaluate the response of nutrient uptake after applying 15 t ha-1 of sewage sludge, compost and a commercial fertiliser to soil in grain and straw of winter wheat (Triticum turgidum L. cv. Vitron); secondly investigate the composition of the same parameters in the original soil and compare them with soil after applying fertiliser treatments. A field-scale experiment established the agronomic performance of air-dried sewage sludge and composted sludge for winter wheat...
March 14, 2018: Journal of the Science of Food and Agriculture
Alejandro Gonzalez-Martinez, Alejandro Margareto, Alejandro Rodriguez-Sanchez, Chiara Pesciaroli, Silvia Diaz-Cruz, Damia Barcelo, Riku Vahala
The emergence and spread of antibiotics resistance in wastewater treatment systems have been pointed as a major environmental health problem. Nevertheless, research about adaptation and antibiotics resistance gain in wastewater treatment systems subjected to antibiotics has not been successfully developed considering bioreactor performance, microbial community dynamics and microbial activity dynamics at the same time. To observe this in autotrophic nitrogen removal systems, a partial-nitritation biofilter was subjected to a continuous loading of antibiotics mix of azithromycin, norfloxacin, trimethoprim, and sulfamethoxazole...
2018: Frontiers in Microbiology
Alua Omarova, Kamshat Tussupova, Ronny Berndtsson, Marat Kalishev, Kulyash Sharapatova
Improved water, sanitation and hygiene (WASH) are significant in preventing diarrhea morbidity and mortality caused by protozoa in low- and middle-income countries. Due to the intimate and complex relationships between the different WASH components, it is often necessary to improve not just one but all of these components to have sustainable results. The objective of this paper was to review the current state of WASH-related health problems caused by parasitic protozoa by: giving an overview and classification of protozoa and their effect on people's health, discussing different ways to improve accessibility to safe drinking water, sanitation services and personal hygiene behavior; and suggesting an institutional approach to ensure improved WASH...
March 12, 2018: International Journal of Environmental Research and Public Health
Morgan Petrovich, Binh Chu, Dorothy Wright, Jim Griffin, Maryam Elfeki, Brian T Murphy, Rachel Poretsky, George Wells
Wastewater treatment plants (WWTPs) are known to harbor antibiotic resistance genes (ARGs) that are disseminated into the environment via effluent. However, few studies have compared abundance, mobilization, and selective pressures for ARGs in WWTPs as a function of variations in secondary treatment bioprocesses. We used shotgun metagenomics to provide a comprehensive analysis of ARG composition, relationship to mobile genetic elements, and co-occurrences with antibiotic production genes (APGs) throughout two full-scale municipal WWTPs, one of which employs biofilm-based secondary treatment and another that uses a suspended growth system...
March 9, 2018: FEMS Microbiology Ecology
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