Treatment Of Coke-Plant Wastewater By MBR Combined With Microwave

This paper took coke wastewater as the research object, sueveyed the effects between biological treatment and physicochemical treatment, which economic was analyzed. At last, the best treatment process that treated coke wastewater were determined. The research results had important significance for coke wastewater treatment.The treatment effects between conventional activated sludge (CAS) and membrane bioreactor (MBR) were compared. The results showed that the removal rate of CODcr, NH3-N, TN, TOC reached 88%,100%,86% and 88.3% respectively by MBR, which was better than CAS. On the base of MBR, the two deep treatment process including activated carbon adsorption and microwave-assisted activated carbon were adopted to treat membrane effluent, at the same time the effect and cost were compared between them. According to the experiment results, treatment of coke-plant wastewater by MBR combined with microwave can receive better effect. In the best operating condition, the CODcr of influent was lower than 80 mg/L, the TOC of influent was lower than 25 mg/L, the NH3-N of influent was lower than 0.5 mg/L, the TN of influent was lower than 25 mg/L, the UV254 of influent was lower than 0.9 cm-1 and the color of influent was lower than 50 TCU. All of indexes could achieve the national I emission standards. Moreover, the cost of microwave-assisted activated carbon process was lower than activated carbon adsorption because that microwave can regenerate activated carbon.The influential factors such as species and dosage of carbon, pH, the time of microwave, the power of microwave and using times of carbon that impacted on CODcr,TOC,TN and color were investigated in the paper. When the kind of carbon was coal carbon, the dosage of carbon was 60g/L, the time of microwave was 3min and the power of microwave was 464W, removal rate of CODcr, TOC, TN, UV254 and color reached 63%,75%.68%.80% and 78% respectively.