肠衣废水的预处理技术（Pretreatment technology of casing wastewater）.docVIP

肠衣废水的预处理技术（Pretreatment technology of casing wastewater） Pretreatment technology of casing wastewater Abstract: casing wastewater is a kind of organic wastewater with high concentration. The wastewater has large CODCr value, high nitrogen, phosphorus and salt content. According to the characteristics of the wastewater, two steps of coagulation biochemical treatment are adopted. The experimental results show that the combination of ferric chloride and non-ionic PAM and amphoteric PAM is better, the water quality after coagulation is relatively clear, and the removal rate of CODCr can reach 50%. Keywords: coagulant, ferric chloride, aerobic treatment I. Introduction In recent years, Chinas food industry, especially the rapid development of meat industry, promote the economic development and improve peoples quality of life, but a large amount of wastewater discharged directly, the water environment caused great pressure especially slaughtering wastewater [1]. There are several methods used in wastewater treatment in our country, such as sequencing batch activated sludge process (SBR), anaerobic contact process, UASB process, coagulation process, anaerobic aerobic two step method, etc. [2, 3]. This experiment will Two 、 experimental principle 1. coagulation pretreatment Coagulation technology with chemical coagulant removal of fine dispersed particles and colloidal substances, the coagulation mechanism of the main mechanism, the compression of the electrical double layer adsorption and charge neutralization mechanism, adsorption bridging mechanism and sediment trap mechanism. This study use poly aluminum chloride, ferric chloride, polyacrylamide, diatomite, inorganic and organic flocculant on casing wastewater to deal with the experiment of coagulation treatment, through coagulation after the removal efficiency of CODCr to choose one or several mixed flocculant as mixed flocculant coagulation treatment. 2. biochemical treatment Activated sludge method was used in this e