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Wastewater discharged from the campus is characterized as low-strength and relative centralization of usage period. The feasibility of sequencing batch activated reactor (SBR) treating low strength domestic wastewater generated in a campus were investigated through orthogonal test. Considering the pollution decomposition efficiency and the energy consuming, the optimal parameters for SBR treating...
This research studied enhanced treatment of sewage from channel discharge with enzyme and the effect of enzyme-biofilm process on the treatment of sewage from channel discharge, and investigated the changes of removal rates of the main pollution indexes at different hydraulic retention time (HRT) to ensure the optimal HRT. Meanwhile, compared the difference between the laboratory developed compounded...
The research studied enhanced treatment of sewage from discharging points of rivers by biofilm process dosing with enzyme and the effect of mineral oil on removal rates of the main pollution indexes, and investigated promotion effect of enzyme (including the laboratory developed compounded enzyme and the foreign composite enzyme) on treatment of sewage by biofilm process. The research results indicated...
The research studied enhanced treatment of sewage from discharging points of rivers by biofilm process dosing with enzyme and the effect of phenol on removal rates of the main pollution indexes, and investigated promotion effect of enzyme (including the laboratory developed compounded enzyme and the foreign composite enzyme) on treatment of sewage by biofilm process. The research results indicated...
The research studied enhanced treatment of sewage from discharging points of rivers by biofilm process dosing with enzyme and the effect of mineral oil on removal rates of the main pollution indexes, and investigated promotion effect of enzyme (including the laboratory developed compounded enzyme and the foreign composite enzyme) on treatment of sewage by biofilm process. The research results indicated...
The research studied enhanced treatment of sewage from discharging points of rivers by biofilm process dosing with enzyme and the effect of phenol on removal rates of the main pollution indexes, and investigated promotion effect of enzyme (including the laboratory developed compounded enzyme and the foreign composite enzyme) on treatment of sewage by biofilm process. The research results indicated...
Characterization of urban stormwater runoff was carried out in commercial, residential and cultural and educational zones during 2009 rainy season in Tianjin. The pH, DO, BOD5, COD, TOC, TSS, TN, TP, NH3-N, As, Pb, Zn, Cd, LAS and fecal coliforms in stormwater runoff were analyzed. The ranges of arithmetic mean concentration of COD, TSS, TN, LAS and fecal coliforms were 67-331 mg/L, 134-480 mg/L,...
There are many case studies of vertical flow constructed wetlands. However, issues of effectiveness of the vertical flow constructed wetland plants in filtering pollutants needs to be addressed. In the current experiment, three plant species are discussed. The results show that among the three chosen plant species, Juncus effuses was more effective in removing pollutants than Canna generalis and Typha...
The effects of dissolved oxygen concentration, temperature and other operation factors on shortcut nitrification and denitrification process for the treatment of landfill leachate was studied in a sequencing batch reactor. The results showed that the termination of aeration could effectively control the reaction at the phase of nitrite and could get stable removal rate of ammonia nitrogen and relatively...
A three-dimensional coupled physical and water quality model was developed and applied to Jiaozhou Bay to study water quality involving nutrients, biochemical oxygen demand, dissolved oxygen, and phytoplankton. The water quality model is based on WASP5 which quantifies processes governing internal nutrients cycling, dissolved oxygen balance, and phytoplankton growth. The model was used to simulate...
The remains of zooplankton subfossil and sediment characteristics were examined from a macrophyte dominated shallow lake Wuliangsuhai in Inner Mongolia, China, in order to study past limnological changes. The lake began to switch to eutrophication gradually in the middle 1980s, creating a Transitional Sediment Layer (TSL, about 17 cm depth) that can be visually used to separate sediments derived from...
Three different operation modes were used in vertical flow constructed wetland system treating rural wastewater. The results showed that, low water level operation can provide more oxygen for organic matter and NH4+-N removal, but lack of the anoxic condition for denitrification. Remarkable removals of organic matter, NH4+-N and TN were achieved under the cyclic batch operation. Due to the lack...
A synergetic process for simultaneously filtration and denitrogenation in two cascaded deep beds was studied for advanced treatment of secondary effluent. Both the deep beds were up-flow and packed with 2 m height of 3~4 mm polystyrene foam pellets. The first bed was assembled an aerator in its bottom for nitration, and the second bed was added methanol in its influent for denitrificaion. When HRT=1~2...
The purpose of this study was to choose a fine chemical to efficiently remove ammonia nitrogen from the ammonia water in AS Process, which provides a new available approach to treat coking wastewater. The experiment adopted "Air Stripping and Adsorption" to remove ammonia nitrogen from the ammonia water, and studied the reaction temperature T, pH, the time of stripping t, the dosage of the...
Ammonia nitrogen is a common pollutant in water environment, and the nitrogen removal techniques have been studied extensively. In this work, a new kind of annular reactor was developed and the photocatalysis with suspended TiO2 was used for degradation of ammonia nitrogen. The effects of experimental conditions on the ammonia degradation efficiency and the photocatalytic products in the effluent...
Water pollution in rural areas or small cities has been a key environmental problem in China. Limited by underdeveloped economy and poor technical capacity, cost- effective and easily operable treatment technologies are highly needed at present, especially for China's western small mountain cities and/or rural areas. An Anaerobic Sequencing Batch Biofilm Reactor (ASBBR) was developed and a bench-scale...
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