The Research On Treatment Of Paper Making Waetewater With Ferric-Carbon Micro-Electrolysis

Water is a very important resource for the existence and development of our human society. Modern industry produces more and more wastewater, and water pollution situations are increasingly more serious than ever before. Industrial wastewater has attracted a great deal of attention because of its high concentration, high toxicity, complex composition and low biodegradability, the country sewage increasingly stringent emission standards. Papers to daqing as a paper making wastewater treatment, and in the light of difficult biochemical treatment, the result is not satisfactory, ferric-carbon micro-electrolysis to the main process, combined with the coagulation sedimentation, biochemistry processes of a pilot study with a view to establishing a reasonable process and operating parameters, papermaking wastewater treatment COD below 100 mg/L, so as to achieve national emission standards.Though the erperiment and single factor rotates,research the effrcts of pH, reaction time, iron to wastewater ratio,iron to carbon ratio and other factors on the ferric-carbon micro-electrolysis method treatment result are inspected; And the effects of coagulant dosage, pH, assistant coagulant dosage on the result of coagulatoin treatment ore inspected. The optimum operating conditions for the ferric-carbon micro-electrolysis method is that the wastewater pH is 4, the reaction time is 45 minute, the iron to wastewater ratio is 1:6, and the iron to carbon ratio is 1:1. The optimum operating conditions for coagulation treatment is that the coagulant dosage is 80mg/L, the pH is 3, the assistant coagulant dosage is 5mg/L, the total distribution time is in 18 min around, and then 30 min for sedimentation.Papers through static test of ferric-carbon micro-electrolysis-biochemistry, ferric-carbon micro-electrolysis - coagulation. coagulation - biochemical research, inspected the ferric-carbon micro-electrolytic method for the follow-up process, and ferric-carbon micro-electrolysis right papermaking wastewater performance improvements. Test results show that, the ferric-carbon micro-electrolysis pretreatment of paper making wastewater, the biochemical properties of enhanced, ferric-carbon micro-electrolysis effluent water relative coagulation, used as a biochemical treatment after the treatment process better, COD removal efficiency better COD value from 156 mg/L reduced to 126 mg/L.Ferric-carbon micro-electrolysis, coagulation, bio-chemical method joint operation conducted the following test: bio-chemical– micro-electrolysis– bio-chemical method, COD from 700 ~ 740mg / L to 90 ~ 95mg/L, bio-chemical– micro-electrolysis - coagulation method, COD from 700 ~ 740mg / L to 105 ~ 115mg/L, coagulation- microelectrolysis- bio-chemistry, COD from 880 ~ 940mg / L to 85 ~ 95mg/L. Experimental studies, coagulation - precipitation - microelectrolysis - biochemical methods, papermaking wastewater treatment operating conditions closer to the convergence process, COD removal efficiency optimization.Economic and technical analysis, coagulation– micro-electrolysis - biochemical process for papermaking wastewater, total investment 2.527 million yuan. Total operating costs of about 1.042 yuan/t. The papermaking wastewater treatment process, the effluent quality indicators below the national emission standards, protection of the environment, and lower cost, with good economic returns, so as to achieve the economic, social and environmental benefits of three reunification.