引用本文:
李达, 张崇剑, 马文成, 韩洪军, 陈志强. 剩余污泥强化混凝气浮预处理煤气化废水[J]. 环境化学, 2018, 37(12): 2585-2595
LI Da, ZHANG Chongjian, MA Wencheng, HAN Hongjun, CHEN Zhiqiang. Pretreatment of coal gasification wastewater by excess sludge enhanced coagulation-flotation[J]. Environmental Chemistry, 2018, 37(12): 2585-2595

剩余污泥强化混凝气浮预处理煤气化废水
李达1, 张崇剑2, 马文成1, 韩洪军1, 陈志强1
1. 哈尔滨工业大学环境学院, 城市水资源与水环境国家重点实验室, 哈尔滨, 150090;
2. 中国市政工程中南设计研究总院有限公司, 武汉, 430000
摘要:
为解决低浑浊度煤气化含油废水混凝气浮药剂投加量大、效率低的问题,本文开展混凝剂污泥共投加提高气浮工艺除污染能力的研究.研究表明,剩余污泥的投加明显改善了混凝沉淀对油类污染物的去除,在剩余污泥投加量从0增加到1200 mg·L-1时,含油量去除率由28.1%提升至44.1%.聚合氯化铝(PAC)、聚丙烯酰胺(PAM)和剩余污泥的最适宜投加量分别为150、2、1200 mg·L-1.A/O工艺二沉池剩余污泥强化混凝气浮效果最佳,充分气浮反应后对含油量的去除率由46%提升至84%,且气浮池油水分离区微气泡的稳定性得到明显改善.
关键词:    剩余污泥    混凝剂    混凝气浮    煤气化废水   
Pretreatment of coal gasification wastewater by excess sludge enhanced coagulation-flotation
LI Da1, ZHANG Chongjian2, MA Wencheng1, HAN Hongjun1, CHEN Zhiqiang1
1. State Key Laboratory of Urban Water Resource and Environment(SKLUWRE), School of Environment, Harbin Institute of Technology, Harbin, 150090, China;
2. Central & Southern China Municipal Engineering Design and rResearch General Institute, Wuhan, 430000, China
Abstract:
To solve the problems of high dosfage and low efficiency of the coagulation-flotation process in treating low turbidity gasification oily wastewater, coagulant and excess sludge were added together to improve the removal capability of air floatation process in this paper. Results showed that the addition of excess sludge significantly improved the removal of oil pollutants by coagulation precipitation. When the amount of excess sludge was increased from 0 to 1200 mg·L-1, the removal rate of oil content was increased from 28.1% to 44.1%.The optimal dosages of polyaluminum chloride (PAC), polyacrylamide (PAM) and excess sludge were 150, 2 and 1200 mg·L-1, respectively. Excess sludge from the secondary sedimentation tank of A/O process achieved the best performance, and the removal rate of the oil increased from 46% to 84% after sufficient airflow reaction time. And the stability of the microbubbles in the oil-water separation zone of the flotation tank was improved significantly.
Key words:    excess sludge    coagulant    coagulation-flotation    coal gasification wastewater   
收稿日期: 2018-05-08
基金项目: 国家重点研发计划(2016YFB0600502)和黑龙江省级别资助项目(GX17C003)资助.
陈志强,Tel:15904603951,E-mail:czqhit@163.com
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