White Rot Fungi Experimental Study Of The Coking Wastewater

The treatment process of coking plant wastewater was the integrated processes of "pre-treated physico-chemical treatment — anaerobic treatment — aerobic treatment — white rot fungus treatment".The ideal conditions were determined in coking plant wastewater treatment by white rot fungus. The ideal conditions were: first, to the acclimated white rot fungus, the ideal pH was the one of original wastewater, and in this pH, the COD of wastewater, treated by white rot fungus in 10 days, was 665.74mg/L from its original concentration of 2545.08mg/L. On the contrary, after 8 days anaerobic treatment with general bacteria, the COD of treated water was 2531.50mg/L from its original 2689.73mg/L, with only 6.42% removal efficiency. The aerobic treatment of 10 days time-interval was implemented after anaerobic treatment and the COD of output was 1049.19mg/L from its original 2690.01mg/L, with only 61.00% removal efficiency.Activity inhibition of ammonia to white rot fungus became obvious after 6 days treatment. Moreover, when ammonia concentration was more than 300mg/L, inhibition was not much more obviously with the increase of ammonia concentration, and when the concentration was below 300mg/L, inhibition was less with the decrease of concentration.The integration of white rot fungus and ammonia removal bacteria can make full use of two organisms, e.g. it could remove both organic compounds and ammonia at same time. Through 11 days treatment, COD of output was 654.79mg/L from its original 3162.06mg/L, with79.29% removal efficiency and ammonia output was 9.79mg/L from its original 83.34mg/L, with 88.25% high removal efficiency. Through experiment analysis, the mechanics of these two bacteria is synergism mechanics.The pre-treated physico-chemical treatment was mainly on ammonium magnesium treatment to remove ammonia in wastewater. The ideal conditions of the treatment were determined by the experiments: The ideal reagent distribution (mol ratio) is MgCl₂·6H₂O : NH₃-N : Na₂HPO₄·12H₂O =1.2 : 1 : 1, and ideal pH 9.75. The removal efficiency under ideal conditions is that ammonia concentration of output water is 63.01mg/L from its original concentration of 560.63mg/L, with 88.76% removal efficiency.