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Journal of Environmental Sciences (China)

Mohammad Shahid, Mohd Saghir Khan
Bacterial strain RV9 recovered from greengram nodules tolerated 2400μg/mL of hexaconazole and was identified by 16S rDNA sequence analysis as Bradyrhizobium japonicum (KY940048). Strain RV9 produced IAA (61.6μg/mL), ACC deaminase (51.7mg/(protein·hr)), solubilized TCP (105μg/mL), secreted 337.6μg/mL EPS, and produced SA (52.2μg/mL) and 2,3-DHBA (28.3μg/mL). Exopolysaccharides produced by strain RV9 was quantified and characterized by SEM, AFM, EDX and FTIR. Beyond tolerance limit, hexaconazole caused cellular impairment and reduced the viability of strain RV9 revealed by SEM and CLSM...
April 2019: Journal of Environmental Sciences (China)
Yan Kong, Yuan Zhuang, Zhiyong Han, Jianwei Yu, Baoyou Shi, Kun Han, Haotian Hao
Hydrogels have attracted large attention in wastewater treatment fields due to their low-cost and good interaction with pollutants, among which novel double network hydrogel is an outstanding class. To expand the application of double network hydrogel in water treatment, in this study, eco-friendly physically cross-linked double network polymer hydrogel beads (DAP) are prepared and studied in depth on the mechanism of Methylene Blue (MB) adsorption; and then the polymer hydrogels are further functionalized by inorganic materials...
April 2019: Journal of Environmental Sciences (China)
Sam Toan, William O'Dell, Christopher K Russell, Sun Zhao, Qinghua Lai, Huiping Song, Ying Zhao, Maohong Fan
Amine-basedcarbon-capture technologies have been shown to be energetically expensive and to cause significant environmental and epidemiological impacts due to their volatility. Bicarbonate formation from carbon dioxide's reaction with water has been suggested as an effective alternative for capturing CO2 ; however, the thermodynamics of this reaction are not well understood. This study experimentally determined the equilibrium constant of sodium bicarbonate (NaHCO3 ) decomposition to sodium, water, and carbon dioxide; the study also compared the equilibrium constant to theoretical calculations...
April 2019: Journal of Environmental Sciences (China)
Xiang Shi, Shufeng Wang, Dongxue Wang, Haijing Sun, Yitai Chen, Jianfeng Liu, Zeping Jiang
Screening potential plant species is a crucial consideration in phytoremediation technology. Our previous study demonstrated that Rhus chinensis Mill. seedlings had potentials for phytoremediation of Pb contaminated soil. However, its bioaccumulation and tolerance characteristics remain unclear. Seedling growth, LMWOAs secreted by roots, Pb subcellular distribution and chemical forms, and mineral elements in R. chinensis tissues were evaluated under different Pb concentrations (0, 25, 50, 100, 200 and 400 mg/L) in culture solution at 14 days after planting...
April 2019: Journal of Environmental Sciences (China)
Jie Gao, Yu Duan, Ying Liu, Xuliang Zhuang, Yichen Liu, Zhihui Bai, Wenlin Ma, Guoqiang Zhuang
Quorum sensing (QS) regulation of the composition of ammonia-oxidising archaea (AOA) and ammonia-oxidising bacteria (AOB) communities and functions in wastewater treatment was investigated. Specifically, we explored the role of N-acyl-l-homoserine lactones (AHLs) in microbial community dynamics in activated sludge. On average, the specific ammonia-oxidising-rate increased from 1.6 to 2.8 mg NH4 + -N/g MLSS/hr after treatment with long-chain AHLs for 16 days, and the addition of AHLs to sludge resulted in an increased number of AOA/AOB amoA genes...
April 2019: Journal of Environmental Sciences (China)
Ran Jing, Soliver Fusi, Alisha Chan, Staci Capozzi, Birthe V Kjellerup
This study involved an evaluation of the potential for bioremediation of polychlorinated biphenyls (PCBs) in the effluent from a large municipal wastewater treatment plant. It was focused on the presence of PCBs in two types of effluents: the continuous effluent present during dry weather conditions and the intermittently present effluent that was present during wet weather due to incoming stormwater. The annual discharge of PCBs for both types of effluent was calculated based on a five-year dataset (2011-2015)...
April 2019: Journal of Environmental Sciences (China)
Yongmin Wang, Qing Xie, Qinqin Xu, Jinping Xue, Cheng Zhang, Dingyong Wang
As a global toxic pollutant, mercury (Hg) bioaccumulation within food chain could be influenced by human disturbance. Ten typical fish species were collected from Changshou Lake, an artificial lake used to carry out cage fish culture, to investigate the C/N isotopic compositions and Hg bioaccumulation in fish. The results showed that the total Hg (THg) and methylmercury (MeHg) levels in fish muscles ((56.03 ± 43.96) and (32.35 ± 29.57) ng/g, wet weight), comparable with those in most studies in China, were significantly lower than the international marketing limit (0...
April 2019: Journal of Environmental Sciences (China)
Peng Xu, Enrong Xiao, Junmei Wu, Feng He, Yi Zhang, Zhenbin Wu
High nitrate (NO3 - ) loading in water bodies is a crucial factor inducing the eutrophication of lakes. We tried to enhance NO3 - reduction in overlying water by coupling sediment microbial fuel cells (SMFCs) with submerged aquatic plant Ceratophyllum demersum. A comparative study was conducted by setting four treatments: open-circuit SMFC (Control), closed-circuit SMFC (SMFC-c), open-circuit SMFC with C. demersum (Plant), and closed-circuit SMFC with C. demersum (P-SMFC-c). The electrochemical parameters were documented to illustrate the bio-electrochemical characteristics of SMFC-c and P-SMFC-c...
April 2019: Journal of Environmental Sciences (China)
Jun Bai, Yuanqing Chao, Yanmei Chen, Shizhong Wang, Rongliang Qiu
The effects of interaction between Bacillus subtilis DBM and soil minerals on Cu(II) and Pb(II) adsorption were investigated. After combination with DBM, the Cu(II) and Pb(II) adsorption capacities of kaolinite and goethite improved compared with the application of the minerals independently. The modeling results of potentiometric titration data proved that the site concentrations of kaolinite and goethite increased by 80% and 30%, respectively after combination with DBM. However, the involvement of functional groups in the DBM/mineral combinations resulted in lower concentrations of observed sites than the theoretical values and led to the enhancement of desorption rates by NH4 NO3 and EDTA-Na2 ...
April 2019: Journal of Environmental Sciences (China)
Yinghan Chen, Tao Lin, Wei Chen
The organic matter and two types of disinfection byproduct (DBP) precursors in micro-polluted source water were removed using an iron-carbon micro-electrolysis (ICME) combined with up-flow biological aerated filter (UBAF) process. Two pilot-scale experiments (ICME-UBAF and UBAF alone) were used to investigate the effect of the ICME system on the removal of organic matter and DBP precursors. The results showed that ICME pretreatment removed 15.6% of dissolved organic matter (DOM) and significantly improved the removal rate in the subsequent UBAF process...
April 2019: Journal of Environmental Sciences (China)
Lin Chen, Chengyi Wang, Shanshan Liu, Liang Zhu
The adsorption and desorption behavior of Cr(VI) in membrane capacitive deionization (MCDI) was investigated systematically in the presence of bovine serum albumin (BSA) and KCl with different concentrations, respectively. Results revealed that Cr(VI) absorption was enhanced and the adsorption amount for Cr(VI) increased from 155.7 to 190.8 mg/g when KCl concentration increased from 100 to 200 mg/L in the adsorption process, which was attributed to the stronger driving force. However, the adsorption amount sharply decreased to 90...
April 2019: Journal of Environmental Sciences (China)
Xiaoqi Wang, Wei Wei, Shuiyuan Cheng, Chong Zhang, Wenjiao Duan
SO4 2- and NO3 - are important chemical components of fine particulate matter (PM2.5 ), especially during haze periods. This study selected two haze episodes in Beijing, China with similar meteorological conditions. A monitoring-modeling approach was developed to estimate the secondary conversion ratios of sulfur and nitrogen based on monitored and simulated concentrations. Measurements showed that in Episode 1 (24th-25th October, 2014), the concentrations (proportions) of SO4 2- and NO3 - reached 35.1 μg/m3 (14...
April 2019: Journal of Environmental Sciences (China)
Md Manik Mian, Guijian Liu, Balal Yousaf, Biao Fu, Rafay Ahmed, Qumber Abbas, Mehr Ahmed Mujtaba Munir, Liu Ruijia
A series of new biochar-supported composite based on the combination of biochar and metallic nanoparticles (NPs) were produced through single-step pyrolysis of FeCl3 -Ti(OBu)4 laden agar biomass under NH3 environment. The physiochemical properties of composites were characterized thoroughly. It has found that heating temperature and N-doping through NH3 -ambiance pyrolysis significantly influence the visible-light sensitivity and bandgap energy of composites. The catalytic activities of composites were measured by degradation of Methylene Blue (MB) in the presence or absence of H2 O2 and visible-light irradiation...
April 2019: Journal of Environmental Sciences (China)
Yubo Tu, Peiwei Han, Lianqi Wei, Xiaomeng Zhang, Bo Yu, Peng Qian, Shufeng Ye
Large amounts of cyanide tailings are produced during the cyanidation process in gold extraction, which are hazardous solid wastes due to the toxic cyanide. Pyrite is one of the main minerals in cyanide tailings. The removal of cyanide adsorbed on pyrite by H2 O2 oxidation under alkaline conditions was investigated in this study. It was found that the removal efficiency was positively correlated with pH from 5 to 12, but remained almost constant when pH was higher than 12. The highest cyanide removal efficiency of 91...
April 2019: Journal of Environmental Sciences (China)
Shengguo Xue, Yuzhen Ye, Feng Zhu, Qiongli Wang, Jun Jiang, William Hartley
Bauxite residue is a highly alkaline byproduct which is routinely discarded at residue disposal areas. Improving soil formation process to revegetate the special degraded lands is a promising strategy for sustainable management of the refining industry. A laboratory incubation experiment was used to evaluate the effects of gypsum and vermicompost on stable aggregate formation of bauxite residue. Aggregate size distribution was quantified by fractal theory, whilst residue microstructure was determined by scanning electron microscopy and synchrotron-based X-ray micro-computed tomography...
April 2019: Journal of Environmental Sciences (China)
Baiwen Ma, Wenjing Xue, Yanyan Ding, Chengzhi Hu, Huijuan Liu, Jiuhui Qu
Microplastics have caused great concern worldwide recently due to their ubiquitous presence within the marine environment. Up to now, most attention has been paid to their sources, distributions, measurement methods, and especially their eco-toxicological effects. With microplastics being increasingly detected in freshwater, it is urgently necessary to evaluate their behaviors during coagulation and ultrafiltration (UF) processes. Herein, the removal behavior of polyethylene (PE), which is easily suspended in water and is the main component of microplastics, was investigated with commonly used Fe-based salts...
April 2019: Journal of Environmental Sciences (China)
Advanio Inácio Siqueira-Silva, Camilla Oliveira Rios, Eduardo Gusmão Pereira
The revegetation of mined areas poses a great challenge to the iron ore mining industry. The initial recovery process in degraded areas might rely on the use of Fe-resistant grasses. Tropical grasses, such as Paspalum densum and Echinochloa crus-galli, show different resistance strategies to iron toxicity; however, these mechanisms are poorly understood. The Fe-resistance mechanisms and direct iron toxicity as a function of root apex removal were investigated. To achieve this purpose, both grass species were grown for up to 480 hr in a nutrient solution containing 0...
April 2019: Journal of Environmental Sciences (China)
Youngjae Yu, Keun-Young Park, Jaehyun Jung, Wonjung Song, Jaehyeok Kim, Junhee Ryu, Harshad Lade, Jihyang Kweon
A monitoring method of biofouling in reverse osmosis (RO) system was proposed based on the fluorescent signal of resorufin, which is reduced by nicotinamide adenine dinucleotide released from viable cells during aerobic respiration. The fluorescent signal of resorufin reduced by planktonic cells and microorganisms of biofilm showed linearity, indicating its feasibility to monitor biofouling in a RO system. For the application of the method to the lab-scale RO system, the injection concentration of resazurin and the injection flow rate were optimized...
April 2019: Journal of Environmental Sciences (China)
Xiaoyong Liao, Qiongzhi Liu, You Li, Xuegang Gong, Hongying Cao
Removal of polycyclic aromatic hydrocarbons (PAHs) from different soil fractions of contaminated soil was investigated by using activated persulfate oxidation remediation in our research. The results showed that the light fraction, which accounted for only 10% of the soil, contained 30% of the PAHs at a concentration of 4352 mg/kg. The heavy fraction contained more high-molecular-weight PAHs, and the total PAH concentration was 625 mg/kg. After being oxidized, the removal rate of PAHs was 39% in the light fraction and nearly 90% in the heavy fraction...
April 2019: Journal of Environmental Sciences (China)
Yang Peng, Dunchao Xiao, Gaobo Yu, Yuhong Feng, Jiacheng Li, Xinyu Zhao, Yiyuan Tang, Longzheng Wang, Quan Zhang
The effects of amphiphilic O/W emulsions, stabilized by the alkyl polyglycoside (APG) or cholesterol-grafted sodium alginate (CSAD)/APG systems, on lambda-cyhalothrin adsorption/desorption mechanisms on natural soil minerals (i.e., illite and kaolinite) were investigated. Sorption and desorption of lambda-cyhalothrin onto soil minerals was studied via batch equilibration to give insight into the adsorption equilibrium, kinetics, and thermodynamics of lambda-cyhalothrin adsorption onto minerals. The results indicate the following: (i) The adsorption processes for the APG system and CSAD/APG system include: rapid adsorption, slow adsorption, and adsorption equilibrium...
April 2019: Journal of Environmental Sciences (China)
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