Pilot-Scale Study On High Concentration No Phosphorus Pesticide Wastewater Treatment

With the rapid development of pesticide industry, the pollution of waterbody due to the discharge of pesticide wastewater becomes more and more serious. Since its hard biodegrability, high concentration and toxity, pesticide wastewater has been one of the main sources of water pollution. So it is necessary for us to search for an economical and effective method to solve this problem. Anaerobic-aerobic biological treatment process is an effective conventional process which has been applied widely. While Expanded Granular Sludge Bed (EGSB) and Biological Aerated Filter (BIOFOR) are comparably new developed reactors, which have also attracted great attention. In this paper, combining these two technologies together was studied to treat pharmaceutical wastewater and exert advantages of each method, expecting to obtain best treatment effects and optical economical benefit.The experiment procedure consisted of three parts: the first was previous treatment; the second was anaerobic treatment process, and the third was aerobic treatment process, all tested samples adopt the pharmaceutical wastewater.Experimental results showed that: COD of the three wastewater are10000mg/L,130000mg/L and 40000mg/L.NH₃-N of the three wastewater are 25mg/L,186mg/L and 184mg/L. After the treatment of previous treatment,EGSB and BIOFOR, the water quality of the final effluent in this system meet the First Grade of integrate wastewater discharge standard(GB8978-1996).So compared with other treatment, anaerobic-aerobic biological treatment process is a more effective and feasible way to be applied in the practice of pharmaceutical wastewater treatment.