Research Of Attached Growth Airlift Reactor In Wastewater Treatment

There is shortage of water resources seriously in China,especially Gansu,Qinghai and Ningxia Province in the west north of China. The lack of water resources has restricted the sustainable development of local society and economy. Attached Growth Airlift Reactor（AGAR） is an innovative technology,which is developing according to the different water quality and the different processing. Its advantages is good treatment effect,lower invest, smal er area, lower operation cost,and so on. In this paper,the industrial wastewater and municipal wastewater are treated by AGAR including different filler and high efficient bacteria,compared to the activated sludge process. The research contents are included:（1） Through experimental study on comparison of Aqwise bio-carrier and domestically produced bio-carrier In the LIUHUA Group of Sewage Treatment Plant. The removal rate of COD filled by the Aqwise bio-carrier is 53.26%, However, there is only 48.71% of the removal rate of COD filled by domestically produced bio-carrier. The removal rate of NH₃-N filled by the Aqwise biological carrier reactors is 26.92%, but the rate of homebred is 13.57%. Above of this data prove that the Two-way circulation flowing reactor treatment effect is not good in industrial wastewater with high NH₃-N and low COD. The main reason is this industrial wastewater’s biodegradability is not high. In order to cause the industrial wastewater’s treatment effect is not good.（2）The AGAR with Aqwise filler is strengthened by the high efficient bacteria. The removal rate of NH₃-N reaches to 87.14%,which is increased by 10% compared to the previous rate. When concentration of NH₃-N is very high,especial more than 150mg/L,the wastewater is belong to the high impact concentration of NH₃-N,the common bacteria is inhibited,the effect leads to the rate of NH₃-N,and more the bacteria is difficult to restoration. The high efficient bacteria in AGAR can resist effectively inhibiting the effect and more stable process. The removal rate of NH₃-N is usually more than 70% in the system. The biological film with high efficient bacteria in AGAR is studied by SEM,its structure is very abundant,which is conducive to degradation of organic compounds, increasing dissolved oxygen and mass transfer,and the structure is more stable.（3）The AGAR with Aqwise filler and the activated sludge process treat the municipal wastewater. The removal rate of COD is 90.08% with using AGAR,while it is 83.11% by using the activated sludge process. Moreover,the removal rate of NH₃-N is 79.85% with using AGAR,while it is 58.16% by the activated sludge process. The result indicates the AGAR with Aqwise filler can remove COD and NH₃-N more effectively.