At present, China has relevant standards for the discharge of sewage treatment plants, and the requirements for microbial indicators are relatively high, so in order to ensure that the effluent meets the standards, treatment plants generally have disinfection processes. However, some disinfectants will also follow the effluent into the unpolluted water body, causing a certain degree of damage to the microecology of this natural water body, which not only increases the cost of treatment, but also is not conducive to the improvement of water environmental quality. Deepwater Haina Company understands the long-standing problem, so in the disinfection of sewage, it will be combined with ecological problems to deal with.
Deepwater Haina pays attention to the combination of sewage treatment and disinfection and ecology
What pathogenic microorganisms are contained in the sewage
As mentioned above, municipal sewage treatment is disinfected during the discharge process, with the aim of reducing the number of pathogenic microorganisms in the sewage. At present, the pathogenic microorganisms in the sewage are mainly coliforms, which usually refer to bacteria related to fecal pollution, such as E. coli, Salmonella, Klebsiella gas production, etc., if the content in domestic water is relatively high, it is easy to cause infection, food poisoning and other problems, weak and sick, poor immunity of the population will cause a series of serious complications, healthy people will also have the risk of infection.
What disinfection methods are used for sewage treatment
At present, most of China's municipal sewage treatment plants use ultraviolet rays, liquid chlorine, ozone and other disinfection methods. Through ultraviolet radiation on the water body overcurrent, can make most of the microbial nucleic acids in the water body irreversibly destroyed, but also will appear enzymatic transformation or passivation, this method is indeed simple and fast, but also does not require additional injection, to minimize the impact on the water ecology. However, the effect of sterilization and disinfection will be affected by the flow rate of the water and the turbidity of the effluent. Liquid chlorine is more direct for the killing of microorganisms, but the effect on parasitic spores is not very ideal, this chemical has greater toxicity and corrosiveness, transportation is already a major problem. Ozone is a strong oxidant, its killing effect on pathogenic microorganisms is hundreds of times that of ordinary disinfectants, but at present, its cost is high and energy consumption is large, which increases the cost of operation.
What are the ways to improve
At present, when the municipal sewage treatment plant uses the above disinfection methods, the effect is limited, and it will also destroy the balance of micro-ecology. If you look at it from the perspective of protecting the ecological environment, the most effective way should be to promote the increase of beneficial bacteria, which is used to inhibit the coliform bacteria and other harmful bacteria. So, what are some ways it can be used?
The first is to increase the number of microorganisms, especially protozoa capable of engulfing the coliform and other harmful flora. The most common is the small mouth bellworm, pear-shaped tetramembranous worm can effectively reduce the number of Escherichia coli, their presence can basically reduce by more than 90%, and there are many ciliates and flagellar metabolites can promote the growth of beneficial flora. Secondly, microecological preparations with high net bacterial power can be put into the water inlet of the sewage treatment plant or the main facilities, which can also significantly reduce the number of various harmful bacteria. Finally, there is the intensive depth treatment, which can effectively reduce pathogenic microorganisms on the suspended particles under adhesion through coagulation, precipitation and filtration. At the same time, ecological construction can be strengthened, with the goal of restoring the self-purification capacity of natural water bodies and restoring biodiversity to allow harmful flora to disappear naturally.
Through the combination with microecology, deep-water Haina adopts the safest disinfection method, which can effectively reduce harmful bacteria and increase beneficial bacteria, so that the water body will not be contaminated by various chemical agents. Avoid disinfection of water bodies that do not meet emission standards.