Study On The New Technology Of Coal Chemical Wastewater Treatment

The paper adopted a variety of methods to deal with coal chemical wastewater on the found of analyzing domestic and foreign status quo. It determined that coagulation + MAP precipitation was the pretreatment on wastewater and ascertained the optimum conditions. UV/Fenton reagent, photocatalysis of nanometer TiO₂ power (low-pressure/ high-pressure), UV/Fenton reagent + photocatalysis of nanometer TiO₂ power (high- pressure) were used for further treatment on the effluent and ascertained the optimum conditions respectively through experiment. In optimum conditions, the removal efficiencies of COD, BOD₅, volatile phenol, ammonia, cyanide and color were 85.82%, 78.91%, 74.88%, 96.15%, 33.94% and 99.50% respectively by UV/Fenton reagent, the value of BOD₅/COD increased from 0.35 to 0.58, above guide lines were 78.82%, 67.33%, 69.50%, 95.83%, 77.19% and 99.00% respectively by photocatalysis of nanometer TiO₂ power(low-pressure), the value of BOD₅/COD increased to 0.54, above guide lines were 76.79%, 67.51%, 69.50%, 93.08%, 72.44% and 98.00% respectively by photocatalysis of nanometer TiO₂ power(high-pressure), the value of BOD₅/COD increased to 0.49, above guide lines were 90.91%, 84.42%, 74.88%, 96.15%, 83.94%and 99.80% respectively by UV/Fenton reagent + photocatalysis of nanometer TiO₂ power(high-pressure), the value of BOD₅/COD increased to 0.60. The condition of organic pollutants decomposition in wastewater was discussed by high performance liquid chromatography. The paper researched the inactivation and regeneration of nanometer TiO₂ power and analyzed the mechanism of these technologies and estimated the economic benefits. It also finalized the process of coagulation + MAP precipitation- UV/Fenton reagent as the best project on treating coal chemical wastewater. The contents of COD, BOD₅, ammonia nitrogen, volatile phenol, cyanide and color reduced to 191.79mg/L, 111.24 mg/L, 14.74 mg/L, 3.6 mg/L, 3.62 mg/L and 25 times respectively by this process, the biochemical properties was advanced effectively.