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The water quality improvement of landfill leachate after sequencing batch reactor (SBR) activated sludge process were evaluated by chemical oxygen demand (COD), dissolved organic matter (DOM) fractions, and three-dimensional excitation-emission matrix (EEM), from which the new understanding was obtained. The results indicated that less than 14 % COD was removed by SBR. The EEM of leachate and SBR...
This paper focuses on piecewise linear growth model of water quality about the river. The experiment was performed on South Sewage Discharge River of a certain Coastal City, in China. Physical, chemical parameters such as water temperature (T), turbidity (Tur) were measured over a one-year period including dry period, level period (May), wet period, level period (Oct.). Based on multilevel models,...
According to the application of secondary water-supply system has been used more and more, the problem of water pollution in secondary water-supply system turns serious. Research was made on distributing rules of bacteria in secondary water-supply system; the variety and correlativity of water quality index were analyzed. Index that reflecting total bacteria number in water-supply system was indicated;...
According to Environmental Quality Standards for Surface Water in China (GB3838-2002), we used the 2006-2007 monitoring data to evaluate and characterize the water quality condition of a landscape river in Tianjin based on the comprehensive index methods such as Nemerow Index and single-factor assessment. The results are obtained as follows: (1) The water quality of M River belongs to class V water...
According to Environmental Quality Standards for Surface Water in China (GB3838-2002), monitoring data were used to evaluate and characterize the water quality condition of a landscape river in Tianjin based on the comprehensive index methods such as Nemerow Index and single-factor assessment. The results showed that the water quality of J River belongs to class V water body; the main pollutants of...
In order to study the bacteria status in bulk water and biofilm and better understand the mechanism of second pollution in distribution networks, a pilot distribution networks was built. Different methods, such as heterotrophic plate counts (HPC), acidine orange direct count (AODC), direct viable counts-nalidixic acid (DVC-N.A.) and direct viable counts-5-cyano-2, 3-ditolyl tetrazolium chloride (DVC-CTC)...
In order to study the bacterial regrowth status in bulk water, a laboratorial drinking-water distribution networks was built. Bacteria in water samples were numerated by three different methods. The result indicated that viable bacteria number in drinking water got from culture method (R2A medium) is 1-3 orders of magnitude lower than the result of DVC-N.A. and DVC-CTC. Direct viable counts method...
Parameter identification plays an important role in environmental model application. An integrated method of Markov Chain Monte Carlo simulation (MCMC) and EPANET Multi-Species Extension toolkit was constructed for the parameter identification of water quality model of distribution system, taking bacterial regrowth model with chlorine inhibition as an example. Combined with the prior distribution...
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