Design Of Wastewater Treatment Process For Chemical Engineering Laboratory In A University

With the growing development of higher education and the improvement of scientific and technological innovation ability of universities in China, more and more scientific research and experimental projects are carried out in the laboratory, and then a great amount of wastewater was generated Laboratory wastewater is complex and harmful, it can cause great harm to surrounding environment without timely thorough treatment. But the regulation for laboratory wastewater treatment and the corresponding sewage equipment were still lacked for most universities.Kinetics and the effects of factors on the removal efficiency of hexvalent chromium by iron-carbon micro-electrolysis with the process of pretreatment and integrated centralized wastewater treatment were examined in this research combined with sampling and analysis. According to water quality, water quality standards and water quantity of the survey data, capacity of comprehensive wastewater treatment was set for 100 m3/d, combined disposal technology of coagulation, microelectrohysis, fenton oxidation and the adsorption with activated carbon was selected for the centralized treatment, and special equipment and general equipment were also designed and selected.The optimal conditions for hexvalent chromium removal are found to be 2.0 of pH value,60 min of reaction time and 2.5 of iron/carbon ratio. The removal efficiency of hexvalent chromium at this optimum condition reached 97.85%, which less than the third standard of "Integrated Wastewater Discharge Standard"(GB 8978-1996) Large number of heavy metals (HMs) and suspended solids (SS) of comprehensive wastewater were removed, and the biodegradability was greatly improved with the combined handling of physicochemical treatment, micro electrolysis reduction and oxidation of fenton.