Removal of Organic Categories from Coking Wastewater by Inner Electrolysis UASB A/O2 Process

Abstract:

A study was conducted in treating coking wastewater by inner electrolysis UASB （upflow analerobic sludge bed) A/O2 process, with electrolysis as the pretreatment technology. The results show that on optimal operation condition, the chemical oxygen demand (COD) and phenol concentration pretreated by inner electrolysis, can decrease from 2 500 mg?L-1 and 320.0 mg?L-1 in influent to below 150 mg?L-1 and 0.1 mg?L-1in effluent, respectively. According to gas chromatography mass spectrometer (GC MS) analysis, the inner electrolysis pretreatment can degrade heterocyclic compounds, which contributes to the biodegradability improvement of the units followed, while the UASB can effectively change multi branched phenol into a relatively simple structure and it is of a high removal rate of quinolone. The GC MS analysis also indicates that the effluent has a sharp reduction in its organic categories by adopting the A/O2 process.

Key words:coking wastewater; upflow analerobic sludge bed (UASB); anoxic; contact oxidation