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Moving bed biofilm reactor (MBBR) as a new wastewater treatment process , with its large load , high efficiency , less residual sludge , sludge bulking , simple equipment , easy to operate , can be miniaturized , and the supporting automation , etc. , are gradually move from research to small-scale industrialization , moving bed biofilm reactor will be a direction of the future development of sewage . Moving bed biofilm reactor should be solved first is filler hanging film start , therefore , the paper first the review moving bed biofilm reactor startup characteristics of progress . After experiments , detailed discussion of the inoculation sludge concentration , hydraulic retention time, a gas water than analog sewage . Experimental results show that : low concentration influent CODer ( ≤ 200 mg / L, ) , inoculated sludge concentration is more than 2 times the influent CODcr concentration , but not more than 1000mg / L . In for filler difficult to hang the film , its seed sludge concentration than hanging high concentration of membrane packing . Hydraulic retention time within 9.5h ~ 19h , filler (polypropylene multi-faceted hollow ball ) and fillers (modified polypropylene multi-faceted hollow ball ) showed a hydraulic retention time and CODcr removal , ammonia removal efficiency , fillers on the attached microbial biomass is directly proportional relationship . Gas-water ratio in the range of 25 to 65 for the packing 2 , as the air-water ratio increases , CODcr removal drastically reduced after a first increase relationship exists , CODcr removal effect within this range , an optimum value , ammonia nitrogen removal , packing on biomass with air-water ratio increase gradually reduce . Therefore further drawn : under normal temperature conditions (temperature range 20 to 30 ° C) , packing a hang the membrane time for seven days , the filling ratio of 50 % , HRT 19.0h water to 0.01m3 / L , and the gas-water ratio 65. CODcr average removal rate of approximately 75% , the average ammonia nitrogen removal rate of approximately 90% , an average of the biological approximately 0.08mg / L attached . Under low temperature conditions ( temperature range 10 to 20 ° C ) , packing 2 hanging film for six days , filling ratio of 10 % , HRT was 19.0h water to 0.01m3 / h , air-water ratio of 25 . CODcr average removal rate of about 71% , the average ammonia nitrogen removal rate of approximately 82% , an average of the biological approximately 0.13mg / L attached .
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