Engineering Design Research And Running Analysis On The Treatment Of Integrated Tanning Wastewater In Xinji

This thesis is based on practice of the reconstructive project for treating wastewater from some tanning industrial area in Xinji of Hebei province. The integrated wastewater from tanneries is complicated and not easily biodegradable including high concentration of organic substances and sulfides. The purpose of the research is to put forward a reasonable process to treat the above wastewater effectively and economically in order to meet the demand of Integrated Wastewater Discharge Standard (GB8978-1996). It is useful to achieve eligible discharge of tanning wastewater for the Xinji area and its surrounding region. The static sedimentation experiment and coagulation sedimentation experiment are conducted in the laboratory in terms of wastewater quality analysis. Based on the result of experiments the treatment process which is suitable for this kind of wastewater is set up. That is the process of presedimentation -coagulation sedimentation – adsorption biodegradation. The sludge is treated by direct thicking and dewatering. About these detailed technical proposal and design have been made. The operating records indicate that this wastewater treatment process have high removal efficiency of organic substances and sulfides. When actual water quality index of influent exceed greatly the design index, effluent quality can fulfill the design requirement, furthermore, it is better than the design index. In conclusion all these results demonstrate that this treatment process is reasonable and effective for integrated tanning wastewater, and it can be applied to practice and spread by a model project.