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To enhance enzymatic hydrolysis efficiency of the corn straw, a process microwave pretreatment of corn straw was optimized using response surface methodology (RSM). Estimated optimum parameters were as follows: water to corn straw ratio is 58:1, microwave power is 640w and processing time is 5 minutes. Under these conditions, a maximum enzyme hydrolysis ratio of corn straw (49.25%) after microwave pretreatment was reached.

To enhance further treatment efficiency of the sludge, a process microwave drying of sludge was optimized using response surface methodology (RSM). A quadratic polynomial mathematical model was developed through Box-Behnken experimental design to describe the relationship between tested variables and moisture content of sludge. The experimental values were found to be in accordance with the predicted values, the correlation coefficient is 0.9203(P < 0.001). Estimated optimum parameters were as follows: The sludge: tree bark is 58:1, microwave power is 630w and processing time is 5.32 minutes. Under these conditions, a lowest moisture content of sludge (49.12%) after microwave drying was reached.