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Emissions to the environment in excess of nitrogen, phosphorus is the main pollutants of water eutrophication. In order to reduce such pollution, countries continuously improve nitrogen and phosphorus removal standards to efficient sewage nitrogen and phosphorus removal technology, research and development of a water treatment hot issues. Usually sewage biodegradable organic content less the competition carbon source of denitrifying bacteria and phosphorus removal bacteria seriously affect the biological nitrogen and phosphorus removal. Denitrifying phosphorus removal bacteria share the same carbon source denitrification and phosphorus removal process has the advantages of saving organic carbon source, reduce sludge production and energy consumption, attracted widespread attention. This paper combine MUCT and MBR formation MUCT-MBR process, strengthen the nitrogen and phosphorus removal performance. By continuously improve the influent load, inspect its demand for organic matter, nitrogen and phosphorus removal, anti-load capacity, sludge yield performance of phosphorus removing bacteria, membrane fouling. 1. Gradually reduce influent C / N ratio, increase the nitrogen load (0.088 kg · m -3 · d -1 ~ 0.137 kg · m -3 · d -1 ) visits MUCT-MBR process in addition to the pollution ability. Tests showed that the stable process performance, COD, TN, TP 90%, 81.6%, 75.2%, respectively. The C / N ratio 3.98 denitrifying phosphorus removal is most obvious. The anoxic nitrite as an electron acceptor absorption of phosphorus anoxic P uptake 99.8% of the total P uptake, sludge yield of 0.28kgVSS/kgCOD: anoxic nitrate as an electron acceptor absorption amount of anoxic phosphorus uptake of phosphorus 92% of the total P uptake, sludge yield of 0.32 kgVSS / kgCOD. Nitrite as an electron acceptor, not only TP and TN removal rate reached 89.1% and 82.2%, and the low yield of sludge. Anoxic phosphorus uptake, MUCT-MBR process will be able to get a better electron acceptor required sufficient quantities (experimental obtained> 14 mg N / L) TP removal. High nitrogen load, 2.MUCT-MBR process started, the short time COD, TN and TP average removal rates reached 89.3%, 75.4%, 79.2%; nitrogen and phosphorus removal MUCT-MBR process lies in hypoxia segment of denitrifying phosphorus effect. 3 anaerobic phosphorus release batch test: the of COD insufficient anaerobic phosphorus release to phosphorus uptake, especially sucrose as a carbon source of phosphorus absorption phenomenon. Description the enriched phosphorus removal bacteria (PAO) in the run mode MUCT-MBR certain anaerobic phosphorus absorption characteristics, but the mechanism is not clear. Under conditions of sufficient quantities of the electron acceptor, if the initial load increases, unit NO 3 - -N denitrification P uptake increased anoxic phosphorus uptake rate changes little; units NO 2 - -N denitrification and P uptake in anoxic phosphorus uptake rate reduced; the NO 2 - -N as an electron acceptor phosphorus absorption rate than NO 3 - -N as an electron acceptor phosphorus uptake rate is high, but NO 3 - -N NO 2 - -N as an electron acceptor phosphorus absorption rate is the highest. Anaerobic end, the lowest the sludge containing phosphorus rate and PAO body glycogen content, PHB highest; anoxic and aerobic process, with increasing rate of sludge containing phosphorus and glycogen, PHB declining verified denitrification phosphorus uptake phenomenon. MUCT-MBR long run in a low-carbon source prone to sludge bulking, but efficient Interception of the film to ensure high-quality water.
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