Time filter

Source Type

Chai B.-B.,Xian University of Science and Technology | Huang T.-L.,Xian University of Architecture and Technology | Huang T.-L.,Key Laboratory of Northwest Water Resource | Zhao X.-G.,Xian University of Science and Technology | Li Y.-J.,Xian University of Science and Technology
Journal of Environmental Biology | Year: 2015

Microbial communities in three drinking water reservoirs, with different depth in Xi'an city, were quantified by phospholipids fatty acids analysis and multivariate statistical analysis was employed to interpret their response to different hydrostatic pressure and other physico-chemical properties of sediment and overlying water. Principle component analyses of sediment characteristics parameters showed that hydrostatic pressure was the most important effect factor to differentiate the overlying water quality from three drinking water reservoirs from each other. NH4+ ontent in overlying water was positive by related to hydrostatic pressure, while DO in water-sediment interface and sediment OC in sediment were negative by related with it. Three drinking water reservoir sediments were characterized by microbial communities dominated by common and facultative anaerobic Gram-positive bacteria, as well as, by sulfur oxidizing bacteria. Hydrostatic pressure and physico-chemical properties of sediments (such as sediment OC, sediment TN and sediment TP) were important effect factors to microbial community structure, especially hydrostatic pressure. It is also suggested that high hydrostatic pressure and low dissolved oxygen concentration stimulated Gram-positive and sulfate-reducing bacteria (SRB) bacterial population in drinking water reservoir sediment. This research supplied a successful application of phospholipids fatty acids and multivariate analysis to investigate microbial community composition response to different environmental factors. Thus, few physico-chemical factors can be used to estimate composition microbial of community as reflected by phospholipids fatty acids, which is difficult to detect. © Triveni Enterprises, Lucknow (India).

Kuschk P.,Helmholtz Center for Environmental Research | Stottmeister U.,Helmholtz Center for Environmental Research | Liu Y.-J.,Key Laboratory of Northwest Water Resource | Wiessner A.,Helmholtz Center for Environmental Research | And 2 more authors.
Journal of Environmental Sciences | Year: 2010

Coke plant effluents with high contents of organic compounds are mainly treated by biological aerobic fermentation after physical pre-treatment. In this study, a brown coal condensate wastewater from a low temperature coking process was fermented under methanogenic conditions in discontinuous experiments. By this fermentation, acetate, propionate, and the main polyphenolic compounds (catechol, resorcinol and hydroquinone) were degraded to a level below the detection limit. The COD was reduced by 72% with a residual concentration of 2.1 g/L. This anaerobic fermented wastewater had a residual BOD5 of 0.66 g/L and 2.2 L CH4 were formed per litre of wastewater. An abiotic pre-treatment for this wastewater with air had a negative effect on the COD reduction and decrease of colour on the methanogenic fermentation due to the autoxidation of polyphenolic compounds to humic-like compounds. This study showed that methanogenic fermentations in the treatment sequence of brown coal coking wastewaters could reduce energy consumption for aeration in further treatment processes and had the potential for a better effluent quality due to a less formation of recalcitrant humic-like compounds. © 2010 The Research Centre for Eco-Environmental Sciences, Chinese Academy of Sciences.

Wang X.M.,Xian University of Architecture and Technology | Wang X.M.,Key Laboratory of Northwest Water Resource | Huang T.L.,Xian University of Architecture and Technology | Huang T.L.,Key Laboratory of Northwest Water Resource | And 2 more authors.
Applied Mechanics and Materials | Year: 2012

The random discharge status of acid wastewater in laboratory is a potential hazard to the municipal drainage system, wastewater treatment system and water resources. In this paper, an in-situ acid wastewater treatment equipment for laboratory is suggested. It is composed of an acid wastewater tank, an alkali wastewater tank, a neutralization tank, a washing gas box, pipes and other accessories. It can make the best use of the alkali wastewater produced in the laboratory to deal with the acid wastewater on site. The neutralization reaction takes place in the neutralization tank, and the solution reacted couldn't be discharged into the indoor drainage pipeline until its pH qualifies the standard. Through the sludge discharge pipe, the deposits can be collected individually, and then be hurtlessly treated and reused. Meanwhile, through the washing gas box the waste gas is decontaminated and discharged into atmosphere. So it can not only reduce the environmental pollution but also lower the treatment cost which corresponds with the idea of green laboratory. This equipment has the economical, practical, and workable property. Not only that, through a reasonable transformation, it is also suitable for other kinds of wastewater, so it has a certain technical populization value. © (2012) Trans Tech Publications, Switzerland.

Chai B.,Key Laboratory of Northwest Water Resource | Chai B.,Xian University of Architecture and Technology | Huang T.,Key Laboratory of Northwest Water Resource | Huang T.,Xian University of Architecture and Technology | And 4 more authors.
Journal of Environmental Sciences | Year: 2011

Source water reservoirs easily become thermally and dynamically stratified. Internal pollution released from reservoir sediments is the main cause of water quality problems. To mitigate the internal pollution more effectively, a new method, which combined chemical stabilization with water lifting aerator (WLA) technology, was proposed and its efficiency in inhibiting pollutant release was studied by controlled sediment-water interface experiments. The results showed that this new method can inhibit pollutant release from sediment effectively. The values of mean efficiency (E) in different reactors 2#-5# (1# with no agent, 2# 10 mg/L polymeric aluminum chloride (PAC) was added, 3# 20 mg/L PAC was added, 4# 30 mg/L PAC was added, 5# 20 mg/L PAC and 0.2 mg/L palyacrylamide (PAM) were added) for PO 4 3- were 35.0%, 43.9%, 50.4% and 63.6%, respectively. This showed that the higher the PAC concentration was, the better the inhibiting efficiency was, and PAM addition strengthened the inhibiting efficiency significantly. For Fe 2+, the corresponding values of E for the reactors 2#-5# were 22.9%, 47.2%, 34.3% and 46.2%, respectively. The inhibiting effect of PAC and PAM on Mn release remained positive for a relatively short time, about 10 days, and was not so effective as for PO 4 3- and Fe 2+. The average efficiencies in inhibiting the release of UV 254 were 35.3%, 25.9%, 35.5%, 38.9% and 39.5% for reactors 2#-5#, respectively. The inhibiting mechanisms of the agents for different pollutants varied among the conditions and should be studied further. © 2011 The Research Centre for Eco-Environmental Sciences, Chinese Academy of Sciences.

Zhou S.-L.,Key Laboratory of Northwest Water Resource | Huang T.-L.,Key Laboratory of Northwest Water Resource | Bai S.-Y.,Key Laboratory of Northwest Water Resource | He X.-X.,Key Laboratory of Northwest Water Resource
Zhongguo Huanjing Kexue/China Environmental Science | Year: 2016

In order to isolate the aerobic denitrifiers from oligotrophic reservoir system, and study the taxonomic status and nitrogen removal characteristics for providing evidence to remediate the micro-polluted source water. The oligotrophic aerobic denitrifiers were obtained, through enrichment, domestication, and screening processes, and taxonomic statuses were determined by 16S rRNA, and the nitrogen removal characteristics was detected in the pure culture and source water experiment. As a result, 196 strains were isolated, and 14 strains (ZHF2, ZHF3, ZHF5, ZHF6, ZHF8, ZMF2, ZMF5, ZMF6, N299, G107, 81Y, SF9, SF18, and SXF14) demonstrated the perfect nitrogen removal performances. Based on morphological, physiological, and phylogenetic analysis, ZHF3, ZHF5, ZHF6, ZMF2, G107, 81Y, SF18, and SXF14 were identified as Acinetobacter sp.; ZHF2, and ZHF8 were identified as Novosphingobium sp.; ZMF5 was identified as Aquabacterium sp.; ZMF6 was identified as Sphingomonas sp.; N299 was identified as Zoogloea sp.; SF9 was identified as Delftia sp.. The nitrate removal rates of G107 and 81Y reached 98.88% and 99.44%, in 72 h. Meanwhile, the oligotrophic aerobic denitrification bacteria G107 and 81Y demonstrated the obvious nitrogen removal performances in nitrite medium, ammonia medium and source water medium. From all the results, the isolations of oligotrophic aerobic denitrifiers enriched the species of aerobic denitrification bacteria, and the perfect nitrogen removal performances provided a significant parameter to remediate the micro-polluted reservoir water system. © 2016, Chinese Society for Environmental Sciences. All right reserved.

Discover hidden collaborations