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Coal Gasification Wastewater Pretreatment with Coagulation and N_2 Flotation Combined System 被引量:5

Coal Gasification Wastewater Pretreatment with Coagulation and N_2 Flotation Combined System
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摘要 A N 2 flotation tank combined with coagulation was developed as a pretreatment equipment of biological process to remove oil and other pollutants in coal gasification wastewater( CGW). With optimal PAC dosage of 20 mg / L,the sole coagulation process achieves removal efficiencies of 29. 34% and 26. 83% for oil and COD,respectively. For the sole N 2 floatation process,the optimal N 2 flux and HRT are 20 m3/ h and 20 min. Meanwhile,the oil and COD removal efficiencies are 35. 41% and 14. 26%,respectively. For the combined system of coagulation and N 2 floatation,the optimal parameter values are the same as the ones of separate processes. Correspondingly,the removal efficiencies are 46. 28% and 31. 89% for oil and COD, respectively. Besides,BOD 5 / COD of the effluent is improved. In contrast with conventional dissolved air floatation,the inert gas- N 2 prevents the formation of cyclopentenone, pyridine derivatives, and other heterocyclic aromatic hydrocarbons,thus improving the biodegradability of influent for the subsequent biological processes. A N2 flotation tank combined with coagulation was developed as a pretreatment equipment of biological process to remove oil and other pollutants in coal gasification wastewater (CGW). With optimal PAC dosage of 20 mg/L, the sole coagulation process achieves removal efficiencies of 29. 34% anti 26. 83% for oil and COD, respectively. For the sole N2 floatation process, the optimal N2 flux and HRT are 20 m3/h and 20 min. Meanwhile, the oil and COD removal effieiencies are 35.41% and 14. 26%, respectively. For the combined system of coagulation and N2 floatation, the optimal parameter values are the same as the ones of separate processes. Correspondingly, the removal efficieneies are 46. 28% and 31.89% for oil and COD, respectively. Besides, BODs/COD of the effluent is improved. In contrast with conventional dissolved air floatation, the inert gas - N2 prevents the formation of cyclopentenone, pyridine derivatives, and other heterocyclic aromatic hydrocarbons, thus improving the biodegradability of influent for the subsequent biological processes.
出处 《Journal of Harbin Institute of Technology(New Series)》 EI CAS 2013年第5期20-24,共5页 哈尔滨工业大学学报(英文版)
基金 Sponsored by the Sino-Dutch Research Program(Grant No.SDRP-WRZ) the State Key Laboratory of Urban Water Resource and Environment,Harbin Institute of Technology(Grant No.2013DX10)
关键词 N2 flotation tank COAGULATION coal gasification wastewater OIL BIODEGRADABILITY N2 flotation tank coagulation coal gasification wastewater oil biodegradability
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