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Water Environment Research: a Research Publication of the Water Environment Federation

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https://read.qxmd.com/read/30742347/biofilm-development-dynamics-and-pollutant-removal-performance-of-ceramsite-made-from-drinking-water-treatment-sludge
#1
Shuaiqi Chen, Yang Chen, Haiyan Pei, Qingjie Hou
Alum-sludge ceramsite and denitrifying bacteria (XP-1, XP-2, CL-1, CL-3) were used as substrate and constructed biofilm for enhancing the removal of pollutants from wastewater. The results showed that, due to the large specific surface area, the maximum growth rate was 0.49 mg/(g.d) on the sludge ceramsite, and the mass of biofilm attached onto sludge ceramsite was 5.98 times higher than that when using commercial ceramsite as substrate. Better removal performance could be achieved with the combination of sludge ceramsite and bacteria, viz...
February 11, 2019: Water Environment Research: a Research Publication of the Water Environment Federation
https://read.qxmd.com/read/30742342/aqueous-cadmium-removal-with-ferrate-influencing-factors-removal-mechanism-and-effect-of-coexisting-ions
#2
Hongbo Wang, Ru Zhang, Haining Li, Mei Li, Yonglei Wang, Qian Zhao, Ning Wang
The aim of the work is to evaluate the potential of potassium ferrate (K2 FeO4 , Fe(VI)) removing Cd(II) from aqueous solution and to primarily investigate the mechanism. Batch experiments were carried out to evaluate the influence of various factors including dosage of K2 FeO4 , solution pH, the initial concentration of Cd(II), and coexisting ions. The results showed that increasing dosage of K2 FeO4 benefited the removal of Cd(II) with the efficiency up to 98.97%. The enhanced removal occurring at higher pH could be attributed to less self-decomposition of K2 FeO4 under alkaline conditions...
February 11, 2019: Water Environment Research: a Research Publication of the Water Environment Federation
https://read.qxmd.com/read/30739363/dynamics-of-phosphorus-content-in-the-water-sediment-interface-of-wetlands-in-a-mid-temperature-steppe
#3
Jing He, Derong Su, Shihai Lv, Zhaoyan Diao, He Bu, Zhiron Zheng, Shengxing Ye
In order to reveal dynamics changes in phosphorus release from the sediments of wetlands in a mid-temperature steppe without external phosphorus input, the relationship between phosphorus content in the overlying water, sediment, and interstitial water was studied using the variables control method. The results showed that, during the incubation period, the content of total phosphorus in the overlying water and the content of total phosphorus in interstitial water both presented in the order of August > September > July...
February 10, 2019: Water Environment Research: a Research Publication of the Water Environment Federation
https://read.qxmd.com/read/30737865/solubilization-of-organics-due-to-thermal-hydrolysis-pretreatment-and-the-shift-in-microbial-population-in-anaerobic-digestion
#4
Manisha S Berde, Domenec Jolis
A study was conducted to analyze the effect of solubilization due to thermal hydrolysis pretreatment on the microbial population responsible for anaerobic digestion at mesophilic temperature. Metagenomic and microbial population analysis was done on digesters receiving sludge with and without thermal hydrolysis pretreatment. The digester receiving thermal hydrolysis pretreatment was stable at lower detention times and showed a shift in microbial population with predominance of methane-producing population in comparison to conventional digesters receiving no thermal hydrolysis pretreatment...
February 8, 2019: Water Environment Research: a Research Publication of the Water Environment Federation
https://read.qxmd.com/read/30737861/urban-flood-estimation-and-evaluation-of-the-performance-of-an-urban-drainage-system-in-a-semi-arid-urban-area-using-swmm
#5
Ali Moafi Rabori, Reza Ghazavi
Estimation of urban runoff peak and volume is a fundamental step in determining the transferring capacity of urban drainage systems. The main aim of this study was to present an application of the Storm Water Management Model (SWMM) in order to estimate urban flooding of a semi-arid area (Zanjan city in the northwest of Iran). The performance of an urban drainage system in the study area was also investigated. According to the results, SWMM is an effective tool for urban flood estimation in a semi-arid area...
February 8, 2019: Water Environment Research: a Research Publication of the Water Environment Federation
https://read.qxmd.com/read/30737859/a-comparison-of-heterogeneous-homogeneous-crystallization-for-phosphate-recovery-from-biosolids
#6
Nan-Hung Lin, Yung-Hsu Hsieh, Shun-Hsing Chuang, Chun-Hao Wu, Yao-Hui Huang
In this study, a fluidized bed reactor was used to compare heterogeneous and homogeneous crystallization for recovering magnesium ammonia phosphate (MAP) from the dewatering filtrate at a municipal water resource recovery facility. Investigating the factors affecting crystallization revealed that pH exerted a greater effect than the Mg/P molar ratio. The results of a heterogeneous crystallization experiment showed that removal efficiency of phosphate (RP%) and crystal efficiency of phosphate (CP%) were 68% and 66%, respectively, at a PO4 -P concentration of 200 mg/L, pH of 8...
February 8, 2019: Water Environment Research: a Research Publication of the Water Environment Federation
https://read.qxmd.com/read/30737858/anaerobic-aerobic-combined-system-for-the-biological-treatment-of-azo-dye-solution-using-residual-yeast
#7
Marina Bahia, Fabiana Passos, Oscar F H Adarme, Sergio F Aquino, Silvana Q Silva
This study aimed to investigate the treatment efficiency of a synthetic dye solution in an anaerobic-aerobic combined reactor system, using pretreated residual yeast as a nutrient source and redox mediator. The applicability of the residual yeast as a nutrient source was firstly evaluated in anaerobic batch tests. Subsequently, two continuous bench-scale treatment settings were studied: (1) an Upflow Anaerobic Sludge Blanket (UASB) reactor, followed by an activated sludge system; and (2) a UASB reactor, followed by a shallow polishing pond...
February 8, 2019: Water Environment Research: a Research Publication of the Water Environment Federation
https://read.qxmd.com/read/30737854/review-of-the-factors-affecting-modeling-oxygen-transfer-by-fine-pore-diffusers-in-activated-sludge
#8
Gustavo Andrés Baquero-Rodríguez, Jaime Andrés Lara-Borrero, Daniel Nolasco, Diego Rosso
In this review, the factors affecting the transfer of oxygen in activated sludge processes using fine-pore diffusers for water resource recovery are critically discussed. In water resource recovery facilities, the energy required for aeration constitutes 50% to 80% of the total energy consumed by the plant. This critical review highlights the use of fine-pore diffuser aeration and emphasizes the significance of accounting for the following factors: diffuser aging and fouling, diffuser layout, diffuser type, selector benefits, local environmental conditions (temperature and atmospheric pressure), influent wastewater variability, dissolved oxygen control systems, and airflow rates...
February 8, 2019: Water Environment Research: a Research Publication of the Water Environment Federation
https://read.qxmd.com/read/30737850/effect-of-centrifugation-on-water-recycling-and-algal-growth-to-enable-algae-biodiesel-production
#9
Thomas Igou, Steven W Van Ginkel, Patricia Penalver-Argueso, Hao Fu, Shusuke Doi, Asmita Narode, Sarasija Cheruvu, Qian Zhang, Fariha Hassan, Frazier Woodruff, Yongsheng Chen
The latest research shows that algal biofuels, at the production levels mandated in the Energy Independence and Security Act of 2007, will place significant demands on water and compete with agriculture meant for food production. Thus, there is a great need to recycle water while producing algal biofuels. This study shows that when using a synthetic medium, soluble algal products, bacteria, and other inhibitors can be removed by centrifugation and enable water recycling. Average water recovery reached 84% and water could be recycled at least 10 times without reducing algal growth...
February 8, 2019: Water Environment Research: a Research Publication of the Water Environment Federation
https://read.qxmd.com/read/30737846/ion-exchange-nutrient-recovery-from-anaerobic-membrane-bioreactor-permeate
#10
Patrick Mullen, Kaushik Venkiteshwaran, Daniel H Zitomer, Brooke K Mayer
Nutrient recovery from municipal wastewater was evaluated using anion exchange media loaded with hydrated ferric oxide (HFO) and copper (Cu2+ ) (Dow-HFO-Cu resin) to selectively capture phosphate, followed by clinoptilolite for ammonium removal and recovery. Nutrients were concentrated in the regenerants and recovered as precipitated struvite. Media exchange capacity after multiple ion exchange cycles was determined using permeate from an anaerobic membrane bioreactor (AnMBR) treating synthetic or actual municipal wastewater from a full-scale water reclamation facility...
February 8, 2019: Water Environment Research: a Research Publication of the Water Environment Federation
https://read.qxmd.com/read/30735276/species-and-correlations-between-selenium-and-mercury-in-fishpond-ecosystems
#11
Xiaoping Yu, Mengxue Wang, Xuejiao Nan, Yafei Guo, Tianlong Deng
The chemical species and contents of selenium and mercury in water, sediments, and crucian carps collected from three wild and three aquaculture fishponds in Tianjin, China, were determined, and the interaction between selenium and mercury in water was also investigated by the calorimetry method. The results revealed that the average contents of total selenium (TSe) and total mercury (THg) in each item of the wild areas were higher than in those of the aquaculture areas, and significant differences (95% confidence) were presented for THg both in the sediments and crucian carps...
February 8, 2019: Water Environment Research: a Research Publication of the Water Environment Federation
https://read.qxmd.com/read/30714244/bone-derived-biochar-and-magnetic-biochar-for-effective-removal-of-fluoride-in-groundwater-effects-of-synthesis-method-and-coexisting-chromium
#12
Jingyao Zhou, Yuyan Liu, Yitong Han, Fanqi Jing, Jiawei Chen
The presence of fluoride in groundwater in excess of 1.5 mg/L is a major environmental health concern and biochar is a promising low cost adsorbent for the treatment of such water. In the present study, pristine and magnetic biochars were synthesized by peanut hull and bovine bone for the adsorption of fluoride. The biochars were systematically characterized by SEM-EDS, BET, XRD, VSM, FTIR and XPS. The experiment results showed that the magnetic biochar prepared by soaking biomass in FeCl3 solution and then pyrolyzing ('pre-pyrolysis') had a higher adsorption capacity than that prepared by mixing pristine biochar with Fe2+ /Fe3+ solution and then treating with NaOH ('post-pyrolysis')...
February 3, 2019: Water Environment Research: a Research Publication of the Water Environment Federation
https://read.qxmd.com/read/30698871/adsorption-of-cd-and-ni-from-water-by-graphene-oxide-and-graphene-oxide-almond-shell-composite
#13
Nasibeh Yari Moghaddam, Bahareh Lorestani, Mehrdad Cheraghi, Saeed Jamehbozorgi
The present study describes the preparation and capability of the graphene oxide/almond shell (GO@AS) composite by a freeze-drying method. The composite showed excellent ability to uptake nickel and cadmium ions, which were characterized by Fourier transform infrared spectrum and scanning electron microscopy techniques. The optimized values of pH, contact time, and adsorbent doses were found to be 7.5, 30-180 min, and 0.1 g, respectively. Also, adsorption isotherms of metal ions on adsorbents were determined and correlated with common isotherm equations such as Langmuir and Freundlich models...
January 30, 2019: Water Environment Research: a Research Publication of the Water Environment Federation
https://read.qxmd.com/read/30695123/effect-of-ph-and-temperature-on-vinasse-decolorization-by-lactic-acid-bacteria-in-batch-processes
#14
Marta Wilk, Małgorzata Krzywonos, Przemysław Seruga, Ewa Walaszczyk
The waste-free policy is part of the process of sugar production from beets in which the resulting molasses are used for ethanol production. However, during this process another byproduct, namely vinasse, is created. Therefore, there is a problem with the utilization of wastewater, which cannot be disposed to the environment without being treated. Melanoidins, caramels, and hexoses alkaline degradation products contained in the vinasse give it a dark brown color. The aim of the study was to investigate the effect of the pH and the temperature on the decolorization of vinasse by lactic acid bacteria (Lactobacillus plantarum, L...
January 29, 2019: Water Environment Research: a Research Publication of the Water Environment Federation
https://read.qxmd.com/read/30695122/activated-sludge-morphology-significantly-impacts-oxygen-transfer-at-the-air-liquid-boundary
#15
Ken Campbell, Jianmin Wang, Guoqiang Liu, Glen Daigger
Oxygen transfer is a key process determining the energy use of a biological wastewater treatment process. In this research, we investigated the effect of sludge morphology, especially the role of filamentous microorganisms, on oxygen transfer using bench-scale complete-mix activated sludge reactors with solids retention times (SRTs) of 10-, 20-, and 40-days, respectively. Results indicated 5 - 10% reduced aeration need in the 40-day SRT reactor, compared to 10- and 20-day SRT reactors to maintain the same dissolved oxygen level, due to the improvement in sludge settleability and oxygen transfer efficiency (OTE)...
January 29, 2019: Water Environment Research: a Research Publication of the Water Environment Federation
https://read.qxmd.com/read/30695121/durability-and-performance-of-loofah-sponge-as-carrier-for-wastewater-treatment-with-high-ammonium
#16
Jian Zhang, Jianpeng Yang, Qing Tian, Xing Liang, Yanbin Zhu, Wolfgang Sand, Fang Li, Chunyan Ma, Yanbiao Liu, Bo Yang
Loofah sponge (LS) was used as carrier for high ammonia wastewater treatment with a sequencing batch biofilm reactor (SBBR), aimed at evaluating its nitrogen removal performance and durability to changeable pH and microbial corrosion. The results indicate that the average removal for COD, NH4+-N and total nitrogen (TN) accounted to more than 80%, 90% and 70%, respectively, in 203 days. After SBBR operation for 108 days, the average weight loss of the loofah sponge was 49.1%. Yet, the main structure of utilized loofah sponge remained unaffected (proved by scanning electron microscopy)...
January 29, 2019: Water Environment Research: a Research Publication of the Water Environment Federation
https://read.qxmd.com/read/30695120/an-artificial-intelligent-platform-for-asset-management-contributes-to-better-decision-making-tools-for-operations-maintenance-and-utility-management
#17
D Sen, A Fashokun, R Angelotti, M Brooks, H Bhaumik, C Card, A Lodhi, A Godrej, C Chung
An Artificial Intelligence system was developed and implemented for water, wastewater, and reuse plants to improve management of sensors, short and long-term maintenance plans, asset and investment management plans. It is based on an integrated approach to capture data from different computer systems and files. It adds a layer of intelligence to the data. It serves as a repository of key current and future operations and maintenance conditions that a plant needs have knowledge of. With this information, it can simulate the configuration of processes and assets for those conditions to improve or optimize operations, maintenance and asset management, using the IViewOps (Intelligent View of Operations) model...
January 29, 2019: Water Environment Research: a Research Publication of the Water Environment Federation
https://read.qxmd.com/read/30693624/impacts-of-solids-retention-time-and-antibiotic-loading-in-activated-sludge-systems-on-secondary-effluent-water-quality-and-microbial-community-structure
#18
Daniel Gerrity, Majid Neyestani
Solids retention time (SRT) is one of the most important factors in designing and operating activated sludge systems for biological wastewater treatment. Longer SRTs have been shown to alter the structure and function of microbial communities, thereby leading to improved treatment efficacy with respect to bulk and trace organics, nutrient removal, and membrane fouling. Research has also shown that longer SRTs and/or higher influent antibiotic concentrations may lead to increased prevalence of antibiotic resistance...
January 28, 2019: Water Environment Research: a Research Publication of the Water Environment Federation
https://read.qxmd.com/read/30667126/immobilization-of-cr-vi-from-solution-by-a-graphene-oxide-nzvi-biochar-composite
#19
Jingge Shang, Jie Gao, Junting Xi, Yingjie Wang, Fangyu Ji, Ruijun Li
A graphene oxide (GO) - nano-scale zero valent iron (nZVI)- biochar composite (GO-nZVI/BC) was synthesized prior to characterization by X-ray diffraction (XRD), vibrating-sample magnetometer(VSM), transmission electron microscopy(TEM), X-ray photoelectron spectroscopy(XPS) and Raman spectroscopy analyses. Batch experiments were performed at different initial Cr(VI) concentrations, contact times, and solution pH values. The effects of coexisting anions, and chelating agents were also examined. The results indicated that the removal of Cr(VI) was highly pH-dependent and reached a maximum capacity at pH of 2...
January 22, 2019: Water Environment Research: a Research Publication of the Water Environment Federation
https://read.qxmd.com/read/30667125/water-treatment-residual-coated-wood-mulch-for-addressing-urban-stormwater-pollution
#20
Hanieh Soleimanifar, Yang Deng, Kirk Barrett, Huan Feng, Xiaona Li, Dibyendu Sarkar
Innovative treatment materials and technologies are demanded to address urban stormwater pollutants that challenge traditional infrastructure. This study aimed to investigate adsorption behaviors of aluminum-based water treatment residual (WTR) coated mulch for capturing representative runoff pollutants (i.e. P, Cu, Zn, and Pb) and evaluate its treatment performance in a filtration bed. Data from batch studies was fit using the nonlinear least square optimization technique. Adsorption kinetic data followed the pseudo 2nd -order reaction patterns, while the adsorption isotherm data obeyed the Freundlich models...
January 22, 2019: Water Environment Research: a Research Publication of the Water Environment Federation
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