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Study on the Alkali Recovery Performance and Mixed Wastewater Treatment Technology of Effluent from Bamboo Chemical Mechanical Pulping Process
Received:May 14, 2021  
DOI：10.11980/j.issn.0254-508X.2021.07.006
Key Words:bamboo chemical mechanical pulping  alkali recovery  anaerobic-aerobic  Fenton
Fund Project:对发展中国家科技援助项目（KY201801001）。
Author NameAffiliationPostcode
ZHANG Yu China National Pulp and Paper Research Institute Co.， Ltd.， Beijing， 100102
National Engineering Lab for Pulp and Paper， Beijing， 100102 		100102
SU Zhenhua China National Pulp and Paper Research Institute Co.， Ltd.， Beijing， 100102
National Engineering Lab for Pulp and Paper， Beijing， 100102 		100102
FAN Shujie China National Pulp and Paper Research Institute Co.， Ltd.， Beijing， 100102
National Engineering Lab for Pulp and Paper， Beijing， 100102 		100102
GONG Chen China National Pulp and Paper Research Institute Co.， Ltd.， Beijing， 100102
National Engineering Lab for Pulp and Paper， Beijing， 100102 		100102
NI Jianping China National Pulp and Paper Research Institute Co.， Ltd.， Beijing， 100102
National Engineering Lab for Pulp and Paper， Beijing， 100102 		100102
YANG Bin China National Pulp and Paper Research Institute Co.， Ltd.， Beijing， 100102
National Engineering Lab for Pulp and Paper， Beijing， 100102 		100102
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Abstract:The physical and chemical characteristics of effluent from bamboo chemical mechanical pulping process were analyzed to evaluate its feasibility of alkali recovery， and the anaerobic-aerobic+Fenton deep oxidation process was used to treat its mixed wastewater （including white water and washing water of paper machine with CODCr concentration of 2950 mg/L） to study the discharge water quality in this study. The results showed that the rheological property of concentrated effluent from bamboo chemical mechanical pulping process was better than that of black liquor from bamboo chemical pulping process at the same concentration. The chlorine content of concentrated effluent （0.94%） was closed to that of bamboo chemical pulping black liquor. Both calorific value （high calorific value was 11.91 MJ/kg， low calorific value was 10.89 MJ/kg） and expansion volume （19.52 mL/g） were slightly lower than bamboo chemical pulping black liquor. There was a linear relationship between the solid concentration （Y） and Baume degree （X） in the concentrated effluent with the relationship equation of Y=1.5196X-1.693， indicating that alkali recovery technology could be used for its treatment. After the mixed wastewater was treated by anaerobic-aerobic+Fenton deep oxidation， the removal rate of CODCr was 97.3%. The qualities of the treated effluent could meet the demand of Discharge Standard of Pulp and Paper Industry Water Pollutants （GB 3544—2008）.
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