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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。
The remaining sludge in urban sewage treatment plant was anaerobically pyrolyzed into biochar and KOH modified. The adsorption of NH_4 ~ + -N, PO4_3 ~ - P and COD in eutrophication simulated wastewater was studied KOH modified mode, pyrolysis temperature, pyrolysis time on the adsorption effect. The results showed that the specific surface area of sludge was positively correlated with pyrolysis temperature and time, while the average pore size was opposite. KOH co-pyrolysis method was not conducive to improving the physicochemical properties of biochar. Positive adsorption of NH_4 ~ + -N and PO_4 ~ (3 -) - P showed that KOH modification of biochar was detrimental to the adsorption of NH_4 ~ + -N, but it could adsorb PO_4 ~ (3- ) -P; COD adsorption of 8 kinds of biochar is better at 3 h.