Views: 5 Author: Site Editor Publish Time: 2021-11-11 Origin: Site
Potato starch processing industry is an important channel for digesting potato, which has developed rapidly in recent years. In the process of potato starch processing, a large amount of production wastewater will be produced. About 5 ~ 8 T potatoes can produce 1T starch, while the production of 1T potato starch produces about 8T wastewater, and the concentration of wastewater pollutants is high, so it is difficult to meet the standard by biochemical treatment.
In recent years, the application of membrane process in sewage treatment has developed rapidly. The pore size range of reverse osmosis (RO) membrane is generally 0.1 ~ 1 nm. It can remove ions and small molecular organics. It has the advantages of high removal rate of organics, nitrogen and phosphorus and stable water quality. However, RO membrane is easy to be polluted and blocked, and has high requirements for water inlet. Ceramic membrane has the advantages of effectively removing divalent and multivalent ions and good separation effect on low molecular weight organics and salts. It has been more and more widely used in the field of wastewater treatment, and its separation performance is better than ultrafiltration and microfiltration.
By using delanmeier ceramic membrane pretreatment and biochemical process, the treated potato starch wastewater can meet the water quality requirements of water as farmland irrigation. Ultrafiltration Ceramic membrane equipment can remove excessive protein in wastewater. Examples show that the rejection rate of protein is more than 85% and the concentration multiple is more than 10 times. On the one hand, it can reduce the burden for subsequent biochemical processes, on the other hand, it can recover the protein for other purposes. Its technical features are as follows:
1, Easy to clean: due to the high corrosion resistance of ceramic membrane, solid plugging can be dissolved by strong acid, the oily sediment is washed with alkaline solution, and the gel containing the enzyme is used to treat the protein gel stuck on the membrane. The ceramic membrane element has asymmetric structure, so the dirt on the membrane surface can be removed by using the recoil method.
2. Easy disinfection: the membrane can be sterilized by high-temperature steam or high-pressure cooking, and in chlor alkali environment.
3. Good mechanical properties: the ceramic membrane has high structural stability, does not deform under certain pressure, does not dissolve and swell in any solvent, and can withstand the wear of solid particles.
Potato starch processing industry plays an important role in improving agricultural comprehensive economic benefits, increasing farmers' income and local financial income, and expanding rural and urban employment. Optimize potato starch wastewater treatment technology, organically combine ecological environmental protection with "membrane process" technology, improve the recycling utilization rate of water in the production process, so as to reduce the generation and discharge of wastewater. Effectively solving the pollution problem of potato starch processing wastewater has good environmental, economic and social benefits for the development of the industry.