Study On Treatment Of Cocking Wastewater By Different Flocculants

In this paper cocking wastewater was treated by chlorine dioxide, chlorine, compound ferrate and PASS, respectively. Experiment result indicate chlorine dioxide and ferrate was superior than the other flocculants, either in the CODcr removal efficiency or in the chroma and SS removal efficiencies. Only the PASS is better than the sodium ferrate in the turbidity removal efficiency.The removal efficiency of the ammonia-nitrogen in cocking wastewater by combined ferrate was studied. The effects of the FeO4~" concentration, pH and temperature in the removal of NH3-N were investigated. The results were suggested that the NH3-N in the crude cocking wastewater could be removed from3493.8mg/L to 1653.9mg/L when the ferrate concentration was 60.14mg/L and the temperature was 71; while in the disposed cocking wastewater, the NHb-N concentration was decreased from 2.706mg/L to 0.0345mg/L when the ferrate concentration was 13.278mg/L, and the removal rate reached 98.7%.The stability of the compound ferrate,the influences of the concentration of the compound ferrate, pH value, reaction time and temperature have been studied in the decolouration of the cocking wastewater. The experiment results indicate that the additive A can obviously improve the stability of the solution of the fresh compound ferrate. The compound ferrate exhibits excellent decolorant effect, in the decolonration of the cocking wastewater. The colority of the treated cocking wastewater was less than GB standard limits of drain off water.