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In order to solve the increasingly serious problem of eutrophication in China, the government had issued a new wastewater discharge standard that focuses on reducing the nutrients from effluents (TN < 15 mg/L, TP<0.5 mg/L). These stringent new requirements had resulted in the need for improved nutriment removal from existing full-scale wastewater treatment plants. In this study a series...
By investigating the nitrogen concentrations in effluents of the horizontal subsurface-flow constructed wetlands under the conditions of different kinds of substrates, residence time and heights, as well as the nitrogen concentrations changes along the flow in the wetlands, the nitrogen removal routes in the wetlands were analyzed. The results demonstrated that the wetland system with zeolites demonstrated...
Static and dynamic simulation of effect of carbon source and hydraulic retention time (HRT) on removal performance of nitrogen and phosphorous were carried out by using activated sludge model software Biowin3 for typical anaerobic-anoxic-aerobic (A2/O) process in municipal wastewater treatment plant. The static simulation results showed that increasing C/N and C/P could improve obviously removal performance...
An innovative process step-feed Anaerobic-(Anoxic/Oxic) n -Membrane Bioreactor [An-(A/O) n-MBR] was developed to treat synthetic domestic wastewater. Performance of the lab-scale system was investigated at different organic compounds in the influent. The results showed that, under the conditions imposed, although the COD concentration fluctuated in the range of 120–1200mg/L, high performance on COD...
The modified DE Oxidation Ditch Process adopted by the Xindu Wastewater Treatment plant has proven to be a good engineering practice in Wastewater treatment. This article analyses the sewage DE oxidation ditch process and the improvements made at the Xindu plant, concluding with the experience of the removal of nitrogen and phosphors.
In membrane bioreactor (MBR) technology, the membrane fouling is the main problem. In this study, the integrated plate MBR was used to treat the municipal wastewater. It is ascertained that the critical flux of polyethersulfone(PES) membrane with MWCO of 70,000 Da is 43.6L/m2.h. And the membrane was made by a domestic firm. The tests revealed that in the operation process of a MBR, membrane fouling...
Recently, the study of nitrous oxide (N2O) and methane (CH4) emission in the process of treating domestic wastewater drived more and more people's attention.N2O is by-product of nitrification. Some studies showed that N2O emission influenced by temperature, pH value, DO, salinity and plant species. CH4 was produced in strictly anaerobic conditions through the reduction of CO2 by methane bacteria....
There is obvious effect for eutrophic wastewater treatment by constructing mangrove wetland, but mangrove plants grow under circumstances of a certain salinity, so this may influence the wastewater purification efficiency. Rhizophora stylosa, one of dominant mangrove species in South China, was used to construct simulated wetlands for eutrophic wastewater treatment. After 9 months irrigation to 8...
A modified oxidation ditch process is applied in a full-scale municipal wastewater treatment plant. Compared with the conventional oxidation ditch, the modified oxidation ditch adds some microporous aerators to improve oxygen utilization. The measures bring about a further improvement of nitrogen and phosphorus in the urban wastewater. The monitoring results for one year show that the influent concentrations...
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