Study on Key Process Parameters for Commissioning and Operation of a Water Purification Plant in Shenzhen
In recent years,with the rapid development of Shenzhen economy,the water consumption and sewage discharge in the district are increasing day by day.Due to the continuous improvement of the supporting sewage pipe network facilities,a large amount of domestic sewage and industrial waste water is discharged into the mu-nicipal sewage pipe.The scale of the existing water purification plants can no longer meet the demand.In order to meet the requirements of Shenzhen Water Quality Improvement Action Plan,guarantee the realization of various planning objectives,ensure the benefit of existing supporting projects and improve the regional water environ-ment,it is necessary to expand a water quality purification plant.Multi-stage AO process was adopted in the water purification plant,and the main effluent indexes were in accordance with the Surface Water Environmental Quality Standard(GB3838-2002)for class Ⅳ surface water(TN≤10mg/L).After a period of debugging,the effluent COD,NH3-N,TP,and SS of the plant have stably reached the Class Ⅳ standard for surface water(effluent TN≤10mg/L).Based on the actual operation effect,two sets of influent water ratios of 1:0:0 and 9:5:1 were set.Under the operation of different influent ratio,the operation process parameters such as reflux ratio,external circulation reflux ratio,total ratio of steam to water,sludge age,dissolved oxygen and dosage of PAC,PAM,sodium hypo-chlorite and sodium acetate in each biochemical tank were summarized and the operation effect was analyzed,which provides a reference for the commissioning and operation of water purification plant.
multi-stage A/O processstep-feednitrogen and phosphorus removalremoval ratelow dissolved oxygen
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