Abstract
At present, sewage from agriculture, industry and urban life has become the three major sources of sewage today. As global wastewater emissions continue to increase, people are trying to find more effective solutions. Among them, flocculation technology is widely favored as a more economical and simple one among many water treatment technologies. Inorganic and organic polymer flocculants are two types of chemical flocculants developed and applied in China for a long time. Both types of flocculants have their own advantages in different fields. However, in the process of using these two types of sewage treatment technology, it will bring many adverse effects on human health and ecological environment. Inorganic flocculants have a fast flocculation speed, and have a high specific gravity of alum flowers, and they are easy to sink, but they will bring a large amount of inorganic ions such as aluminum and iron into the treated liquid, and excessive intake of aluminum ions by the human body may cause dementia A series of diseases. Strong corrosiveness is the biggest problem of iron salt flocculants in use. It will shorten the service life of the equipment and bring color to the treated water. Organic polymer flocculant flocculates faster than inorganic flocculant, and has more advantages in terms of dosage, separation process, adaptability, etc., because some polymer flocculants monomer itself is toxic, even its hydrolysis or degradation the product is also toxic (such as polyacrylamide monomer). Therefore, researchers are committed to finding efficient, safe, and non-polluting flocculants to meet the requirements for safe use of flocculants and the reduction of secondary pollution during wastewater treatment. Compared with chemical flocculants, the outstanding advantages have caused the rapid development of microbial flocculants, and its outstanding advantages without secondary pollution have attracted the attention of many researchers, and the development prospect is broad.
Highlights
The flocculant can cause suspended solid particles in the liquid to aggregate and solidify so as to achieve the purpose of sinking
After a series of tests, it was concluded that microbial flocculants can be used in the pharmaceutical and food industries, and that the waste water treated with microbial flocculants can be recycled and reused, and the emissions can be effectively controlled. , In the pharmaceutical and food industry wastewater treatment links play an important role
The current wastewater treatment technology makes the five-day biochemical oxygen demand index lower, and the discoloration effect of the soluble pigment solution is not obvious, but the soluble pigment can be treated by using a microbial flocculant to achieve the expected effect
Summary
The flocculant can cause suspended solid particles in the liquid to aggregate and solidify so as to achieve the purpose of sinking. The new type of microbial flocculant is a natural high-molecular organic substance, which has the following characteristics: 1.1 Safe and non-toxic. In the pharmaceutical and food industry wastewater treatment links play an important role. Microbial flocculants can be produced by different types of microorganisms, and their components are different, which is more complicated. Most flocculants are made of high-molecular substances such as cellulose and glycoprotein and have relatively strong degradation ability. The use of new-type microbial flocculants will not cause secondary pollution. It has a good effect on the treatment of dye wastewater, building material wastewater, and livestock wastewater
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