Study On The Influencing Factors And Control Of The Activated Sludge Bulking In Pharmaceutical Wastewater Treatment

With the rapid development of China’s pharmaceutical industry, pharmaceuticalwastewater pollution control has aroused great attention and concern. Pharmaceuticalwastewater with a feature that it has complex ingredients and high concentration of pollutants,high COD value, containing toxic and hazardous substances, some nonbio-degradablematerial, moreover, the salinity and chroma are very high sometimes. Activated sludge as amature technology has been a great deal of applications in pharmaceutical wastewatertreatment. However, the sludge bulking problems often occur lead to the deterioration of theeffluent water quality and processing efficiency is greatly reduced, which restricted theapplication of this method into full play. In view of this, the reasons of sludge bulking wereanalyzed while taking a wastewater treatment as target in pharmaceutical factory of ZhaoqingGuangdong provinces, and using the process operating data on the basis of relevant research.The chemical oxygen demand(COD), nitrogen, phosphorus content, sludge loading,sludge index and so on were investigated in the process. There were sludge bulkingphenomenon in the wastewater treatment plant from time to time. Its occurrence is mainlydue to the plant wastewater carbon: nitrogen: phosphorus can not be achieved100:5:1requirements, organic loading is a little low. In addition, we also recognize that with theincreasingly stringent environmental standards, the volume of sewage been treated in theprocess is too small to carry on, and both of the aeration and effluent COD is high.For the problems occurred in wastewater treatment, on one hand, effective early-warningmonitoring methods combined with operational data and parameters of the actual wastewatertreatment was proposed according to the mechanism of filamentous bacteria. On the otherhand, Operation of the system was smooth, wastewater treatment capacity was increased, theeffluent CODcr was reduced after the technological transformation. On the other hand, in theset water regulation acid and alkali dosing device pool was increased with appropriate addacid and alkali, in order to ensure that the biochemical treatment fill the system pH value in astable state;One of the two sets pool water regulation was retained, another transformed forhydrolysis acidification pool; The new system of high load aeration pool was built from themerger of low load aerobic pool and high load aeration pool in the original system; The secondary low load aerobic pool was transformed to efficient aerobic reaction pool of gas upcirculation; The Original pond and the sludge concentration pool were transformed into thesecond pond, combined with the Original second pond, with that the requirements of newsystem can meet4200m~3/d.Operation of the system was smooth, wastewater treatment capacity was increased, theeffluent CODcr was reduced after the technological transformation.