KOH改性污泥生物碳及对富营养化水体吸附研究  

Preparation of the KOH-modified Sludge Biochar by Pyrolysis and Adsorption of Eutrophic Water

作　　者：周树烽 陈成广[1] 刘允初 胡艺[1] 胡保卫[2] 

机构地区：[1]绍兴文理学院元培学院建筑工程系 [2]绍兴文理学院生命科学学院,浙江绍兴312000

出　　处：《环境科学与技术》2017年第8期43-49,共7页Environmental Science & Technology

基　　金：绍兴市科技计划项目(2014B70041);浙江省大学生科技创新活动计划项目(2015R428027;2016R428009)

摘　　要：将城市污水处理厂剩余污泥缺氧热解成生物碳,并进行了KOH改性,研究了其对富营养化模拟废水中NH_4^+-N、PO4_3^--P和COD的吸附,探索了KOH改性方式、热解温度、热解时间等对吸附效果的影响。结果表明:污泥生物碳比表面积大小与热解温度和时间呈正相关,而其平均孔径情况则反之;KOH共热解方式不利于改善生物碳的理化性能;污泥600℃热解的生物碳对NH_4^+-N和PO_4^(3-)-P均呈正吸附;生物碳的KOH改性对NH_4^+-N吸附不利,但与KOH共热解时能很好吸附PO_4^(3-)-P;8种生物碳吸附COD在3 h时效果较好。Biochars were prepared with excess sludge by pyrolysis at hypoxia. The effects of KOH-modified method, pyrolysis temperature and duration on production of sludge biochars were investigated, and adsorption of NI-Ia＋-N, POa3--P, COD in simulated eutrophic water by sludge biochars were further discussed. The results showed that by increasing the pyrolysis temperature （over the range from 400℃ to 800 ℃ ） or duration （over the range from 2 hours to 4 hours） the specific surface area of biochars increased, but the pore size decreased. Co-pyrolysis of sludge-KOH was adverse to improving the physicochemical properties of biochars. The amounts of NH4^＋-N and PO4^3--P absorbed by sludge biochars which prepared at 600 ~C was proportional to the adsorption time. It was found that KOH-modified sludge biochars could not absorb NH4^＋-N in simulated eutrophic water effectively, however, biochars which were prepared by co-pyrolysis of sludge- KOH absorbed PO4^3--P well. Moreover, the optimum adsorption time for adsorbing COD by eight kinds of biochars basically was 3 h.

关 键 词：污泥 KOH改性 生物碳 吸附 富营养化水体 

分 类 号：X703[环境科学与工程—环境工程] TQ424.1[化学工程]