The corn straw was hydrolyzed by diluted acid via microwave radiation under the conditions of the metal salt ferrous sulfate as catalyst. The effect on the reducing sugar production rate was investigated by the concentration of ferrous sulfate, sulfuric acid content, ratio of liquid to solid, the microwave radiation power, time and pressure. The results show that the product yield can reach 38.5% under the best hydrolysis conditions: ferrous sulfate mass fraction of 3%, sulfuric acid mass fraction of 2%, mass ratio of liquid to solid 15, the microwave radiation power 187.5 W, the microwave radiation time 30 min and the microwave radiation pressure 0.3 MPa. Compared to the method without ferrous sulfate or without microwave radiation, this method shows higher yields by 1.1 and 2.8 times, respectively. 

Based on the experimental program of uniform design, PAC coagulation treatment for COD contained in industrial wastewater samples was studied. Effects of PAC dosage, pH and COD concentration of the sample on the COD removal rate (Y, % COD removal) and efficiency (Z, COD removed per PAC) were determined in 10 test runs for wastewater. Non-linear multi variable regression equations were defined to correlate Y and Z with the influencing factors. COD removal, Y and Z were correlated with pH, the best pH is 6~8. COD removal and Y are increased with COD concentration of the sample, the optimizing parameters was correlated with COD concentration of the sample. Z is decreased with the increase of PAC dosage. The optimum PAC dosage was determined by experiment in order to optimize the process conditions.