Dissertation > Environmental science, safety science > Processing and comprehensive utilization of waste > General issues > Wastewater treatment and utilization

Study on the Low Carbon Domestic Sewage Treating by the Anaerobic/Aerobic Biological Beds

Author LiuLingHui
Tutor HeGuoWei
School Guangzhou University
Course Environmental Science
Keywords Sewage Low-carbon source Zeolite Ceramsite Activated sludge Biobeds Removal efficiency
CLC X703
Type Master's thesis
Year 2011
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With the rapid development of urbanization in China, especially in Guangdong Province, the urban sewage will also be included in the deal with the scope of the study low energy consumption, low resource consumption, less secondary pollution, small footprint, highly integrated urban sewage The processing technology is particularly important. Due to the low carbon sources of urban sewage, carbon, nitrogen, phosphorus ratio imbalance, the generally activated sludge or biological aerated filter is difficult to achieve efficient nitrogen and phosphorus removal, how to achieve efficient urban sewage nitrogen and phosphorus removal has become concern for many researchers. This test bio-bed filler zeolite and haydite, anaerobic / aerobic activated sludge process for reference, the study two fillers biological bed anaerobic / aerobic process of low-carbon source of sewage treatment effect compare their treatment effect, to elect better biological anaerobic / aerobic process filler. The test results show that: anaerobic / aerobic the zeolites biological bed the COD Cr NH 3 -N and TP removal rates were as follows: 86.18%, 83.76% and 70.96 % of the final effluent COD the Cr , NH 3 -N and TP concentrations were: 19.23 mg / L, 2.66 mg / L and 0.36 mg / L, both excellent A standard comprehensive emissions in China's urban sewage treatment plant; anaerobic / aerobic zeolite bio-bed treatment is better than anaerobic / aerobic haydite, bio-bed and anaerobic / aerobic activated sludge sewage treatment effect; disgust oxygen / aerobic zeolite biological bed anaerobic treatment removes most of the sewage of COD Cr , NH 3 -N and TP pollution reduced aerobic biological bed physical load to achieve efficient processing capability of anaerobic / aerobic the zeolites biological bed, and also to save power, and reduce the cost of sewage treatment. the COD Cr / NH 3 -N for nitrogen and phosphorus removal study showed that: the influent COD Cr / NH 3 -N 5 1 0: anaerobic / aerobic the filler biological bed NH 3 -N removal rate and TP removal better than tired oxygen / aerobic activated sludge process; NO3 - N concentration of nitrogen and phosphorus removal studies show that: low concentrations of NO3 - N (0.5 mg / L 1 .2 mg / L ) anaerobic bio-bed and anaerobic activated sludge NH 3 -N and TP treatment effect is not obvious, NO3 - N (0.5mg / L 3 .0 mg / L) concentration changes of the aerobic organisms bed and aerobic activated sludge NH 3 -N and TP treatment effect more obvious. Zeolite biological bed biofilm growth is faster and more stable biofilm amount, indicating that the the stable zeolite biofilm attached, not aging, filler layer is not easy to harden, suitable for long-term operation; the ceramsite biobeds biofilm amount of fluctuation is more frequent, indicating Tao grains grow on the surface of the biofilm adhesion is poor, easy to fall off, if the long-running, bed fillers prone to compaction, may be more difficult to achieve stable operation. Application of test research results show that: anaerobic / aerobic biological bed process naturally linked to the film, COD Cr , NH 3 -N and TP concentration treatment effect is not obvious Aeration can only improve aerobic effluent DO concentration, not to improve processing efficiency; anaerobic / aerobic biological bed process hanging membrane activated sludge, COD Cr aerobic treatment effect , and sometimes the aerobic effluent of COD Cr concentrations below 50mg / L, NH 3 -N and TP treatment effect is not obvious. To improve the efficiency of processing required to make the following adjustments: intake pump automatic control system will be adjusted to the appropriate time interval stable intermittent influent; aeration machine automatically control, intermittent water aerobic pool the intermittent aeration; daily scheduled start sludge pump, timely reflux sedimentation tank sludge; aerobic tank inlet in the bottom of the pool instead.

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