Bio-contact oxidation process was applied to treat partly hydrolyzed polyacrylamides (HPAM) in simulation wastewater. Under the condition of HRT 38 h, DO 3～4 mg/L, testing inflow 0.38 L/h, the influence of temperature, inflow concentration of HPAM and carbon resource in wastewater on the remove of COD and degradation of HPAM were investigated. The results show that it is technical feasibility to treat polyacrylamides in simulation wastewater with the process. The average COD removal efficiency reached 60.1% and 56.5%,respectivily, at 37 ℃ and 45 ℃, meanwhile the average degradation rate of HPAM reached

         The effect of mass concentration of starch on accuracy of determining partially hydrolyzed poly acry lamide(H PAM) concentration by use of starch - cadmium iodide method was studied. The results show that the Abs not only increases with the increase of H PAM mass concent ration, but also with the increase of straight chain starch mass concentration. A way to improve the solubility of straight chain starch was adopted and the best added quantity of starch was found. The improved process for determining H PAM mass concentration was displayed. In the range from 0 to 25 mg /L of H PAM mass concentration , a standard working curve of H PAM mass concentrationvs. solution absorbency was constructed with R2 is equal to 0. 999 8.