Research on Air Flotation-Biochemistry-Ultra-Filtration Treatment Technology of Heavy Oil Sewage

At present, the quality of effluent water from the pretreatment process of ultra-filtration in BinYi station is poor, which lead to late block and effluent water is not up to A1 standard. Based on the analysis of the ultra-filtration membrane pollutants, a scale of 1 m3/d field experiment was carried out in Binyi station. Air flotation- biochemistry –ultra-filtration process was used, biochemical degradation strains of COD (BW-1, BW-2, BW-3, WSW-4) and heavy oil degradation strains (3-2-1, 1-2-1) were inoculated. After treatment, the COD of ultra-filtration effluent decreased from 300-400 mg/L to 60-80mg/L, oil content decreased from 20-60 mg/L to about 1 mg/L, suspended solids reduced from 50-100 mg/L to under 1mg/L, the median diameter decreased from 6.4 μm to 0.8 μm, SRB reduced from 25 to 0 per milliliter, HCO3- decreased from 500-600 mg/L to below 100 mg/L, the hardness decreased from 11-12 mmol/L to 10-11 mmol/L, NO3- increased from 0 to 63 mg/L, SDI reduced to 4.8.