Abstract: The dry pyrolysis technology was proposed to prepare sludge-derived adsorbent based on existing problems of conventional chemical activation method. With zinc chloride as activator，the iodine value as evaluation index，the dry process was optimized by using response surface methodology，the results showed that there was significant interaction between the pyrolysis time and the pyrolysis temperature，when the pyrolysis temperature increased，the pyrolysis time can be shortened，the optimum technology parameters were obtained as follows：the pyrolysis temperature of 389.40 ℃，the pyrolysis time of 83.64 min and the concentration of zinc chloride of 21.40% (by mass). Comparative studies between conventional chemical activation method and dry pyrolysis method revealed that dry pyrolysis method needs lower pyrolysis temperature and shorter pyrolysis time than conventional chemical activation method. Under the optimum conditions，the surface area of sludge-derived adsorbent increased by 20.13%. The analysis results of sludge-derived adsorbent showed that mesoporous adsorption was dominant，the curve of BJH showed a wider pore size distribution，the peak at about 4.2nm，the BET surface area was 135.74 m2/g.

Key words: sludge, adsorbent, response surface methodology, preparation, dry pyrolysis

摘要： 针对传统化学活化法制备污泥吸附剂存在的问题，提出了采用化学干法热解技术制备污泥吸附剂工艺；以氯化锌为活化剂，以碘吸附值为工艺评价指标，采用响应面分析法研究了干法热解技术制备污泥吸附剂的工艺条件，结果表明：在热解时间和热解温度之间存在交互作用，当热解温度增加的时候，热解时间可以适当缩短，获得了污泥吸附剂的最佳制备工艺条件。即：热解温度为389.40 ℃，热解时间为83.64 min，氯化锌含量为21.40%；进行比较研究后发现，与传统化学活化法相比，化学干法热解技术制备污泥吸附剂的热解温度较低，热解时间较短，在此条件下制备的污泥吸附剂的比表面积增加了20.13%；污泥吸附剂的分析结果表明污泥吸附剂以中孔吸附为主，BJH孔径分布较宽，最高峰在4.2 nm左右，SBET为135.74 m2/g。

关键词: 污泥, 吸附剂, 响应面分析法, 制备, 干法热解