Chongqing Water Group Co

Chongqing, China

Chongqing Water Group Co

Chongqing, China

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PubMed | Chongqing Water Group Co, Tongji University and University of California at Los Angeles
Type: Journal Article | Journal: Water science and technology : a journal of the International Association on Water Pollution Research | Year: 2016

The primary goal of this study is to investigate ammonia removal, abundance of nitrifying bacteria and microbial community structures in a laboratory-scale integrated fixed film activated sludge (IFAS) reactor. The results of Illumina MiSeq sequencing based on 16S rRNA genes showed Proteobacteria and Bacteroidetes were the dominant phyla in both biofilm and suspended sludge samples in the IFAS reactor. The dominant ammonia-oxidizing bacteria (AOB) species was Nitrosomonas and the dominant nitrite-oxidizing bacteria species was Nitrospira. The contribution of biofilm to ammonia removal increased from 4.0 0.9% to 37.0 2% when the temperature decreased from 25 C to 10 C. The real-time polymerase chain reaction (PCR) result showed the abundance of AOB in suspended sludge was higher than that in biofilm at the same time. However, nitrification is more dependent on attached growth than on suspended growth in the IFAS reactor at 15 C and 10 C and the abundance of AOB in biofilm was also higher than that in suspended sludge. The more robust ammonia removal rate at low temperatures by biofilm contributed to the relatively stable ammonia removal, and biofilm attached on carriers in the IFAS reactor is advantageous for nitrification in low-temperature environment.


He Q.,Chongqing University | Hu C.,Chongqing University | Xu Z.,Kunming Chuyun Traffic Engineering Design Co. | Li H.,Chongqing Water Group Co.
Chinese Journal of Environmental Engineering | Year: 2013

The study on the particle size distribution, feature parameters of ultra-fine grit in combines sewer system of mourainous urban in Three Gorges Reserboir Region was processed. The results show that the average particle size of grit is less than 250 μm in combines sewer system of Fuling area in dry-weather and wet-weather. It is belong to ultra-fine grit. The characteristics and gradation of ultra-fine grit vary depending on a number of factors. These include the type of collection system(combined or separate), the physical condition, mountain landscape, rainfall intensity, dry days before rain, the primary activities(commercial, residential, etc) and soil and water loss etc. The ultra-fine grit content is up to 183.9 mg/L and the average particle size is only 182.6 μm in influent of Fuling Wastewater Treatment Plant. The ultra-fine grit is too fine to be removed by grit trap. When lots of ultra-fine grit into the aeration tank, it brings a series of operational issues such as attrition of pump and mechanical equipment, blockages resulting from grit deposition etc.


Jiang S.,Chongqing University | Jiang H.,Chongqing Jiaotong University | Xiang P.,Chongqing University | Zhang N.,Chongqing Sino French Water Supply Co. | And 2 more authors.
Chinese Journal of Environmental Engineering | Year: 2013

Because of the algae outbreak in Jialing River water system, the algae in source water was hard to be removed in pretreatment process, which caused more than 10 water factorties' blockage in filter and shorten the backwashing cycle from normal 24 h to 2 h. It seriously affected normal operation and dramatically decreased the producing ability of waterworks. Due to the algae outbreak (the dominant species was synedra acus belonging to Diatoms), the effect of PAFS, PAC, and PFC coagulants on algae removal and turbidity removal was compared, with PAFS presenting the best effects, which was chosen as the optimal coagulant. In addition, different pro-oxidations and coagulant aids were added to enhance flocculation removal effects of algae, the result showed that PDMDAAC combined with PAFC gave the best effect, and other promoting coagulation effect was PPC>ClO2>PAM>H2O2>HCA-1. Using 0.6 mg/L PDMDAAC+25 mg/L PAFS applied to exising plants, the residual algae decreased to 49×104~55×104 cells/L, the algae removal rate could reach up to 70%~75%, which greatly reduced the operation load of the filter and recoved the normal operating mode of the waterworks.


Huang L.,Southwest University | Chen Y.,Southwest University | Liu G.,Southwest University | Li S.,Southwest University | And 2 more authors.
Energy | Year: 2015

A constructed wetland plant waste, Arundo donax L. (AD), was pyrolyzed from room temperature to 1000°C under a dynamic high-purity nitrogen atmosphere at different heating rates. Results show that three stages occur during thermal degradation of AD. Mass loss rates associated with lignocellulose degradation were not affected by heating rates. Physical and chemical characterization of ADs pyrolyzed under different temperatures indicated that simultaneous pyrolysis occurred during the lignocellulose devolatilization process. The non-isothermal method indicated that the pyrolysis reaction should conform to a single-step reaction model with average E (activation energy) of 163kJmol-1, calculated by partial least squares linear regression. The most probable mechanism of thermal degradation of AD, determined by the Malek method with the calculated E as the initial value, is described with the random nucleation and later growth (Johnson-Mehl-Avrami (J-M-A) model). It can be written as f(α)=0.28(1-α)[-ln(1-α)]-2.57. Finally, E=163.44±3.50kJmol-1, the reaction order n=0.28±0.031, and the decimal logaritm of pre-exponential factor lg(A)=13.13±0.096lg(s-1) were estimated. © 2015 Elsevier Ltd.


Yan Q.,Chongqing University | Yan Q.,Chongqing Normal University | Gao X.,Chongqing Water Group Co. | Huang L.,Chongqing University | And 7 more authors.
Chemosphere | Year: 2014

The occurrence and fate of twenty-one pharmaceutically active compounds (PhACs) were investigated in different steps of the largest wastewater treatment plant (WWTP) in Southwest China. Concentrations of these PhACs were determined in both wastewater and sludge phases by a high-performance liquid chromatography coupled with electrospray ionization tandem mass spectrometry. Results showed that 21 target PhACs were present in wastewater and 18 in sludge. The calculated total mass load of PhACs per capita to the influent, the receiving water and sludge were 4.95mgd-1person-1, 889.94μgd-1person-1 and 78.57μgd-1person-1, respectively. The overall removal efficiency of the individual PhACs ranged from "negative removal" to almost complete removal. Mass balance analysis revealed that biodegradation is believed to be the predominant removal mechanism, and sorption onto sludge was a relevant removal pathway for quinolone antibiotics, azithromycin and simvastatin, accounting for 9.35-26.96% of the initial loadings. However, the sorption of the other selected PhACs was negligible. The overall pharmaceutical consumption in Chongqing, China, was back-calculated based on influent concentration by considering the pharmacokinetics of PhACs in humans. The back-estimated usage was in good agreement with usage of ofloxacin (agreement ratio: 72.5%). However, the back-estimated usage of PhACs requires further verification. Generally, the average influent mass loads and back-calculated annual per capita consumption of the selected antibiotics were comparable to or higher than those reported in developed countries, while the case of other target PhACs was opposite. © 2013 Elsevier Ltd.


PubMed | Chongqing Normal University, CAS Chongqing Institute of Green and Intelligent Technology, Chongqing University and Chongqing Water Group Co.
Type: | Journal: Chemosphere | Year: 2014

The occurrence and fate of twenty-one pharmaceutically active compounds (PhACs) were investigated in different steps of the largest wastewater treatment plant (WWTP) in Southwest China. Concentrations of these PhACs were determined in both wastewater and sludge phases by a high-performance liquid chromatography coupled with electrospray ionization tandem mass spectrometry. Results showed that 21 target PhACs were present in wastewater and 18 in sludge. The calculated total mass load of PhACs per capita to the influent, the receiving water and sludge were 4.95mgd(-1)person(-1), 889.94gd(-1)person(-1) and 78.57gd(-1)person(-1), respectively. The overall removal efficiency of the individual PhACs ranged from negative removal to almost complete removal. Mass balance analysis revealed that biodegradation is believed to be the predominant removal mechanism, and sorption onto sludge was a relevant removal pathway for quinolone antibiotics, azithromycin and simvastatin, accounting for 9.35-26.96% of the initial loadings. However, the sorption of the other selected PhACs was negligible. The overall pharmaceutical consumption in Chongqing, China, was back-calculated based on influent concentration by considering the pharmacokinetics of PhACs in humans. The back-estimated usage was in good agreement with usage of ofloxacin (agreement ratio: 72.5%). However, the back-estimated usage of PhACs requires further verification. Generally, the average influent mass loads and back-calculated annual per capita consumption of the selected antibiotics were comparable to or higher than those reported in developed countries, while the case of other target PhACs was opposite.


Kang J.,Chongqing University | Du G.,Chongqing University | Gao X.,Chongqing Water Group Co. | Zhao B.,Chongqing University | Guo J.,CAS Chongqing Institute of Green and Intelligent Technology
Water Environment Research | Year: 2014

The relationship between soluble microbial products (SMPs) and extracellular polymeric substances is described, and the characteristics of SMPs in the biological wastewater treatment process, including molecular weight distribution, metal-chelating property, biodegradability, biotoxicity, and membrane fouling, are investigated. The SMPs produced by autotrophs are degradable and utilizable for heterotrophs, thereby confirming the biodegradation of SMPs. Soluble microbial product models are designed through three approaches: establishment of SMP kinetic models or combination with Monod equations, incorporation of SMP generation and degradation into the unified theory raised by Laspidou and Rittmann (2002a), and introduction of the concept of SMP into activated sludge models. The effects of process parameters on SMP concentration are elaborated, based on the optimum biological treatment process operating parameters that can effectively minimize SMP production. The progress of SMP research in water biotreatment systems is presented, and suggestions for future studies are made.


Xiao J.,Chongqing University | Lu P.,Chongqing University | Zhang W.,Chongqing Water Group Corporation | Zhang D.,Chongqing University
Chinese Journal of Environmental Engineering | Year: 2016

Load changes of water quantity and quality characteristics of influent are important factors affecting the control and operation of sewage treatment plants, and they change continually. However, in the long view, the changes follow general rules. To study the influent laws of sewage treatment plants and explore the methods of establishing a prediction model of water quality and influent flow, the influence of the season, weather, and the type of daily on the Dadukou sewage treatment plant influent were analyzed. From this analysis, an influent mathematical model was constructed, and the water quantity, COD, BOD5, TN, NH4 +-N, and TP were evaluated using the checking coefficient η. The correlation coefficients of simulated and measured values of the parameters after checking were 80.6% to 85.4% for 2008 and 83.3% to 87.3% for 2009.The results of this research provide a data basis for computer simulation of regulation strategy for wastewater treatment systems. © 2016, Science Press. All right reserved.


Kang J.,Chongqing University | Ma T.-F.,Chongqing University | Zhang P.,Chongqing University | Gao X.,Chongqing Water Group Co. | Chen Y.-P.,CAS Chongqing Institute of Green and Intelligent Technology
Environmental Science and Pollution Research | Year: 2016

Utilization-associated products (UAPs) and biomass-associated products (BAPs) were quantified separately in this study to characterize soluble microbial products (SMPs) in a drinking water lab-scale biological aerated filter (BAF), and their basic characteristics were explored using gel filtration chromatography and three-dimensional excitation–emission matrix (3D-EEM) spectrophotometry with fluorescence regional integration analysis and parallel factor model. UAPs were observed increased with the increase of filter media depth and accumulated after BAF treatment, whereas BAPs were basically constant. 3D-EEM spectroscopy analysis result showed that tryptophan and protein-like compounds were the main components of UAPs and BAPs, and fulvic-acid-like substance was a major component of BAPs, rather than UAPs. In terms of molecular weight (MW) distribution, UAP MW presented a bimodal distribution in the range of 1–5 and >10 kDa, while BAP MW exhibited unimodal distribution with MW >20 kDa fraction accounting for more than 90 %. The macromolecules of UAPs accumulated after BAF treatment. This study provides theoretical support for in-depth study of SMP characteristics. © 2016 Springer-Verlag Berlin Heidelberg


PubMed | CAS Chongqing Institute of Green and Intelligent Technology, Chongqing University and Chongqing Water Group Co.
Type: Journal Article | Journal: Environmental science and pollution research international | Year: 2016

Utilization-associated products (UAPs) and biomass-associated products (BAPs) were quantified separately in this study to characterize soluble microbial products (SMPs) in a drinking water lab-scale biological aerated filter (BAF), and their basic characteristics were explored using gel filtration chromatography and three-dimensional excitation-emission matrix (3D-EEM) spectrophotometry with fluorescence regional integration analysis and parallel factor model. UAPs were observed increased with the increase of filter media depth and accumulated after BAF treatment, whereas BAPs were basically constant. 3D-EEM spectroscopy analysis result showed that tryptophan and protein-like compounds were the main components of UAPs and BAPs, and fulvic-acid-like substance was a major component of BAPs, rather than UAPs. In terms of molecular weight (MW) distribution, UAP MW presented a bimodal distribution in the range of 1-5 and >10kDa, while BAP MW exhibited unimodal distribution with MW >20kDa fraction accounting for more than 90%. The macromolecules of UAPs accumulated after BAF treatment. This study provides theoretical support for in-depth study of SMP characteristics.

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