Method for treating casing processing wastewater and application of treatment product

Abstract

The invention discloses a method for treating casing processing wastewater. The method comprises the following steps: (1) regulating the PH value of the casing processing wastewater to be 6.0-7.0 with hydrochloric acid with mass concentration of 10%, thus obtaining a solution I; (2) adding a chelating agent to the obtained solution I, thus obtaining a solution II; (3) adding a coagulant aid to the obtained solution II, thus obtaining a solution III; (4) adding a flocculant to the obtained solution III, thus obtaining a solution IV; (5) enabling the obtained solution IV to stand for 1-3 hours, collecting the supernatant, and then filtering the precipitate; (6) drying the filtered precipitate; (7) treating the collected supernatant with ultrafiltration and nanofiltration membranes. The method has the advantages that polypeptides and amino acids, which are not easy to extract, in the casing processing wastewater are extracted by synthesizing an amino acid chelate with the polypeptides and amino acids, so that the extraction ratio is high; the reclaimed water can be recycled, thus saving the resources; the treatment method is simple, is easy to control and simultaneously has economic and environmental benefits.

Description

Technical field [0001] The present invention is a technical field of water treatment in environmental engineering. It is specifically a method of processing the wastewater and the application of the processing products. Background technique [0002] my country is the big country of pig resources, the largest producer of the world's casing, and the main supply country of heparin raw materials.Due to the abundant small intestine resources, the heparin content in its mucosa is also high. At present, most of the domestic lated mucosal waste shaved in the process of gastropics is used as raw materials to extract heparin sodium.my country exports more than 100 tons of heparin and sodium sodium sodium each year. According to the estimation of the discharge of the wastewater in my country ’s casing processing, it is 2250 to 7500T / d, and the heparin processing wastewater is about 6000T / d.Including wastewater is an organic wastewater. It is rich in organic substances such as animal protein...

AI Technical Summary

Problems solved by technology

Casing wastewater belongs to organic wastewater, which is rich in animal protein, fat and other organic substances that are difficult to degrade. It should not be discharged directly. The chemical oxygen consumption is also relatively high, ranging from 625 to 21000mg / L, while the content of inorganic nitrogen is very low. That is, the nutrient structure of the wastewater composition is extremely unreasonable, the wastewater is difficult to be treated by conventional methods, and there is a huge environmental risk in the direct discharge of high-concentration wastewater

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