【正文】 struction method in this System, BOD degradation is a continuous process, nitrification and denitrification occurred in the same pool. Because of the limitation of structure of the oxidation ditch can be effective for BOD, but phosphorus removal denitrification ability is limited. Carrousel Moseley oxidation ditch the influence factors of biological nitrogen removal Influence factors of phosphorus removal from Carrousel Moseley oxidation ditch is primarily a sludge age, nitrate concentration and substrate concentration. Research shows that when the total sludge age of 8 ~ 10 d, the lion39。 Non filamentous bacteria mainly in wastewater sludge bulking sludge load at high temperature is low. Microbial load is high, the bacteria absorb a large amount of nutrients, because of the low temperature, metabolic speed is slow, product storage on a large amount of high viscosity polysaccharide substances, the adhered on the surface of the activated sludge in the water increase greatly, SVI value is very high, the formation of sludge bulking. Aiming at the cause of sludge bulking, can adopt different countermeasures: caused by a lack of oxygen, high water temperature, can increase air or cut into the water to lighten the load, or decrease the MLSS (control sludge return flow), reduce oxygen demand。 Can be adjusted by adding the nitrogen fertilizer, phosphate fertilizer, mixture of nutrient balance (BOD5: N: P = 100:5)。 Chlorine bleaching powder and liquid (% ~ % in dry sludge dosing), inhibit filamentous fungi reproduction, bined with water sludge bulking control. Bubble problem Due to water with a large number of oil, processing System can39。 The sludge age slightly long, sludge aging, also easy to produce foam. With surface spray water or remove foam deforming agent, deforming agent monly used engine oil, kerosene, silicone oil, turnover of ~ mg/L. By increasing the sludge concentration in aeration or reduced air, also can effectively control the bubble. When the wastewater contains surface active material is large, easily removed by foam separation process or other method in advance. Also can consider adding a set of oil removal device. But the most important is the better water management, reduce the high oilbearing wastewater and other toxic wastewater into. Sludge upfloating problem When the oil content in waste water is too large, qualitative light, the whole System in the process of operation can39。 When the aeration time is too long, high nitrification occurred in the pool, the nitrate concentration is high, in the second pond, prone to denitrification, produce nitrogen gas, sludge floating。 Such as water load should be reduced into water or step back flow。 Denitrification is found, should reduce air, increasing the backflow or mud。 Downstream of the guide plate is installed in is apart from the wheel turn (brush) axis of m. Guide plate material can be made of metal or glass reinforced plastics, but is better to glass fiber reinforced plastic. Guide plate pared with other measures for improvement, not only does not increase the power consumption and operating costs, but also can greatly improve the efficiency of oxygen transfer ability and the theory of motivation. In addition, through setting underwater in the aerator upstream driver can also turn on aeration brush at the bottom of the low speed region mixture flow circulation play a positive role, so as to solve oxidation ditch of velocity is low, the sludge sedimentation problem. Set the underwater vehicle is dedicated to promoting mixture operation mode of oxidation ditch can be more flexible。s considerable improvement in performance in 3000 Systems: one is to increase the pool is deep, can reach ~ 8 m, concentric circles type, wall sharing, reduce cover an area of an area, reduce cost and at the same time could improve the ability of resistance to low temperature (up to 7 ℃ )。 Three is the use of the advanced QUTE aeration