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.