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Study on the Synergistic Removal of Micro-stickies and Ca2+ from OCC Wastewater
Received:July 14, 2021  
DOI：10.11981/j.issn.1000-6842.2021.03.54
Key Words:OCC papermaking wastewater;micro-stickies;electrocoagulation;Ca2+;floc
Fund Project:国家自然科学基金（21868004）；广西重点研发计划项目（桂科AB19259013）。
Author NameAffiliationPostcode
LIU Hui College of Light Industry and Food Engineering， Guangxi University， Nanning， Guangxi Zhuang Autonomous Region， 530004
Guangxi Key Laboratory of Clean Pulp & Papermaking and Pollution Control， Guangxi University， Nanning， Guangxi Zhuang Autonomous Region， 530004 		530004
YANG Xiao College of Light Industry and Food Engineering， Guangxi University， Nanning， Guangxi Zhuang Autonomous Region， 530004
Guangxi Key Laboratory of Clean Pulp & Papermaking and Pollution Control， Guangxi University， Nanning， Guangxi Zhuang Autonomous Region， 530004 		530004
FU Wencai College of Light Industry and Food Engineering， Guangxi University， Nanning， Guangxi Zhuang Autonomous Region， 530004
Guangxi Key Laboratory of Clean Pulp & Papermaking and Pollution Control， Guangxi University， Nanning， Guangxi Zhuang Autonomous Region， 530004 		530004
DANG Wenhao College of Light Industry and Food Engineering， Guangxi University， Nanning， Guangxi Zhuang Autonomous Region， 530004
Guangxi Key Laboratory of Clean Pulp & Papermaking and Pollution Control， Guangxi University， Nanning， Guangxi Zhuang Autonomous Region， 530004 		530004
WANG Zhiwei College of Light Industry and Food Engineering， Guangxi University， Nanning， Guangxi Zhuang Autonomous Region， 530004
Guangxi Key Laboratory of Clean Pulp & Papermaking and Pollution Control， Guangxi University， Nanning， Guangxi Zhuang Autonomous Region， 530004 		530004
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Abstract:
      There are two problems in the reusing process of OCC papermaking wastewater， i.e.， the deposition of micro stickies and the calcification of anaerobic granular sludge caused by high Ca2+ concentration. The effects of electrocoagulation， physical， chemical， and biological enzymatic treatments towards OCC papermaking wastewater were compared in this study. The results showed that the electrocoagulation treatment could remove more micro-stickies and Ca2+ compared with other methods. The optimal conditions of electrocoagulation treatment were further explored： aluminum used as the anode， the current density， electrode distance， and reaction time were 115 A/m2， 5 cm， and 60 min， respectively. The relative contents of Al3+ and Ca2+ in flocs after electrocoagulation treatment （under the optimum conditions） were higher than those in the control group， indicating that the micro-stickies， COD， and Ca2+ in OCC wastewater were removed by electrocoagulation effectively， which is a green and non-pollutant process conforming to the requirements of sustainable development.
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