Pilot-scale Application on Treatment Technology of Wastewater from Oily Sludge Pyrolysis
Wastewater from oily sludge pyrolysis with high oil content,high ammonia nitrogen,high COD was difficult to be treated.Qualitative analysis using GC-MS revealed that the wastewater contained 52 kinds of organic compounds.The wastewater was treated by"Pretreatment+Fenton oxidation+Biochemical+Fenton oxidation+BAF"process.The water quality of each unit after treatment was measured for 6 consecutive days.The results showed that the COD concentration in wastewater after treatment by this process was less than or equal to 150 mg/L,and the NH4+-N concentration was less than or equal to 25 mg/L,and petroleum concentration was less than or equal to 10 mg/L,which met the secondary discharge standard requirements of GB 8978-1996"Integrated Wastewater Discharge Standard".The bentonite was used for adsorption pretreatment under acidic conditions,and the removal rates of COD and petroleum in wastewater could reach to 60%and 72%～75%;respectively,ammonia nitrogen was mainly removed in the biochemical unit,and the removal effect of bentonite adsorption and Fenton oxidation on ammonia nitrogen were not significant.The research results provide a new treatment approach for wastewater derived from oily sludge treatment,and provide some references and guidances for the harmless treatment of oily sludge throughout the entire process.
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