中文摘要：

采用响应面中心组合设计,研究了pH和C/N对污泥厌氧发酵产沼气的影响,并利用回归方程对其产气量进行模拟。结果表明,当pH 6.50～8.00时,C/N 20～30之间变化时,产气量随之发生明显变化,当pH 7.25和C/N 25时,污泥单位产气量最高;以pH为因素A,C/N为因素B,单位产气量为响应值R1,进行响应面分析,建立模型得到二次系数方程,根据方程预测,当pH 7.09和C/N 25时,其理论最高产气量可达345 m L/g,而实际验证试验的产气量结果为（348±6）m L/g,与预测值相差仅0.8%,可见该方法确定的最佳条件合理,可以很好地用于污泥厌氧发酵条件的优化。

英文摘要：

The effects of pH and carbon and nitrogen ratio on the method of central composite design,and the gas production sludge anaerobic fermentation gas production were studied with was simulated by using the regression equation. The resuhs in- dicated that the great change of gas production was detected with the variation of pH from 6.50 to 8.00, and C/N ratio from 20 to 30. The gas production reached the maximum when pH was 7.25 and C/N ratio was 25. Then the response surface analysis was used for building the following second-order polynomial model, where R1 represented the gas production,A was the pH and B was the ratio of C/N. According to the second-order polynomial model, the theoretical maximum gas produc- tion was 345 mIJg when the pH was 7.09 and C/N ratio was 25.The actual gas production of the verification test was （348± 5） mL/g at the same condition, the standard deviation was only 8% compared to the predicted value, which suggested that the performance of sludge anaerobic fermentation gas production could be optimized reasonably and accurately through the central composite design.