Fermentation liquid wastewater treatment
Amino acid fermentation waste liquid is the waste liquid discharged after the fermentation liquid is extracted amino acid by sedimentation and membrane filtration. In this waste liquid is rich in amino acids, bacterial bodies, proteins and other solid matter suspension, a variety of inorganic salts, organic acids, biotin and reducing sugar. It is a kind of industrial wastewater with high content of cod, so42-, nh4+-n and bacteria and low ph value, whether it is directly discharged, or simply treated and discharged, the amino acid fermentation waste liquid will have a great impact on the environment.
Colleges and universities, scientific research institutes, MSG production enterprises have made a lot of research around the treatment of fermentation waste liquid, how to carry out effective treatment according to the characteristics of the fermentation waste liquid put forward a number of management techniques and methods.
In the utilization of amino acid fermentation waste stream, the use of fermentation waste stream culture single-cell yeast protein to carry out some of the use of other research are stuck in the laboratory or small test stage, it is more difficult to achieve industrialization, mainly due to the following reasons: ① immature technology; ② high cost of treatment; ③ with the increase in amino acid production, the use of microbial treatment methods have not been able to meet the requirements of the discharge of waste streams; ④ treatment is not complete.
Currently, the process used by various factories to deal with amino acid fermentation waste liquid is: fermentation waste liquid → extraction of bacterial proteins → multi-effect concentration → slurry granulation → organic inorganic compound fertilizer. This process is the more ideal way to deal with amino acid fermentation waste liquid, effectively converting the pollutants in the amino acid waste liquid into organic and inorganic compound fertilizer with high economic value, but the key problem in this process is the secondary pollution of smoke in the process of slurry granulation. Fufeng Group has carried out research in this area and analyzed the flue gas for the first time, and put forward the solution process path to deal with the flue gas, and obtained better results, but there is a one-time investment in this process of high equipment complexity and huge defects.
Glutamic acid production will produce a large number of high-concentration ammonium-containing wastewater, the treatment of this part of the wastewater, the industry's traditional method is to add polymer flocculants to extract the bacterial proteins, evaporation and concentration in a vacuum state, the concentrate using a coal-fired hot-air furnace slurry granulation. Because the hot air furnace wind temperature up to 900 ℃ or so, so when drying a large number of organic matter and ammonium sulfate in the high temperature under the action of coking reaction, the loss of active ingredients, product solubility is low, the fertilizer effect is also a substantial decline in the sale can only be used as scraps!
