Method of processing waste water and recycling protein

Abstract

The invention relates to a method of processing waste water and recycling protein during the production of chondroitin sulfate, comprising the following steps: (1) adjusting the acidity; (2) adding powdery calcium-base bentonite; (3) adding chitosan: (4) adding polymeric aluminum; (5) filtering; and (6) drying and crushing. The invention has the advantages that bentonite of feedstuff is used as adsorbent to recycle the protein in the waste water from the production of the chondroitin sulfate, and the bentonite of feedstuff can be used as feedstuff additive; the chitosan which is polymeric flocculant can well process the protein in the waste water; after the protein in the waste water is recycled, the chemical oxygen demand (COD) of the waste water can be reduced by over 90 percent, and the subsequent low-concentration waste water can be easily processed by the conventional activated-sludge process; the waste water can be processed with simple process, the cost of investment is low, and the economic benefit and the environmental benefit are obvious.

Description

technical field [0001] The invention relates to the field of water treatment of environmental engineering, in particular to a method for wastewater treatment and protein recovery of chondroitin sulfate production. technical background [0002] Chondroitin sulfate is a mixture of 4-sulfate chondroitin, 6-sulfate, chondroitin A, B and other chondroitin sulfates extracted from the nasal bones, throat bones and other cartilages of pigs, cattle, sheep and other animals. Its trade name is "Kangdeling", its main use is to treat headache, migraine, arteriosclerosis, coronary heart disease, angina pectoris, myocardial hypoxia, myocardial infarction and other pharmaceutical agents, and it is also widely used in food and beverage And all kinds of health care products and nourishing products, the domestic demand is increasing day by day, and it is a very popular commodity in the domestic market. In recent years, with the continuous improvement of people's understanding of chondroitin s...

AI Technical Summary

Problems solved by technology

At present, the commonly used protein recovery method is spray drying technology. The advantage of this method is that almost 100% of the protein in the wastewater can be recovered. The disadvantage is that the initial protein content of recovery is too high (more than 20%), which restricts subsequent use as feed additives, etc. In addition, a large amount of exhaust gas is produced during the spray drying process, causing a certain degree of odor pollution

Reverse osmosis membrane technology, such as ultrafiltration, can also achieve good results when used to recover protein in wastewater, but it is rarely used due to its high investment and operating costs

Moreover, the production of chondroitin sulfate is often accompanied by a large amount of high-concentration production wastewater, which makes wastewater treatment difficult due to the special nature of the wastewater

Because its chemical oxygen demand (COD) value is generally higher than 100,000mg / L, but the inorganic nitrogen content is very low, that is, the nutritional structure of the wastewater composition is extremely unreasonable, and the wastewater is difficult to be treated by conventional activated sludge methods. High-concentration wastewater There is a huge environmental risk in the direct discharge of

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