Rural integrated sewage treatment equipment

beautifulRural integrated sewage treatment equipment

Lusheng Water Treatment Equipment Co., Ltd. specializes in productsbeautifulRural integrated sewage treatment equipment.

The company produces year-round: underground integrated sewage treatment equipment, air flotation machines, chlorine dioxide generators, oral and dental sewage treatment equipment, ozone generators, ultraviolet disinfection equipment, inclined tube sedimentation equipment, UASB anaerobic equipment, filter presses, etc., with a complete range of models.

The company sells nationwide, ensuring home delivery and installation. The company also provides customers with various services such as technical support, personnel training, drawing, and technical solutions.

Buy equipment, compare prices from three sources, pay attention to quality, after-sales service, and water quality.

Basic principles of biological deodorization
The basic principle of biological odor treatment is to use microorganisms to absorb odorous substances dissolved in water into their own bodies, and to degrade them through microbial metabolic activities. The target substance is eventually decomposed by microorganisms into inorganic acids, forming an acidic environment that is not conducive to microbial life, and fundamentally degrading substances that produce foul odors during decomposition.
Microbial deodorization can be divided into three processes:
The dissolution process of odorous gases, that is, the transfer from the gas phase to the liquid phase;
2. Odor components in aqueous solutions are absorbed by microorganisms, that is, odors dissolved in water are absorbed by microorganisms through their cell walls and membranes, while odors insoluble in water first adhere to the outside of microorganisms and are decomposed into soluble substances by extracellular enzymes secreted by microorganisms before infiltrating cells;

3. The odorous components that enter microbial cells are decomposed and utilized by microorganisms as nutrients, enabling the removal of pollutants.
The main methods of biological deodorization
According to the existence form of microorganisms in deodorization, treatment methods are mainly divided into biological filtration and biological absorption. Biofilm deodorization technology combines these two methods and can effectively remove odorous substances from sewage treatment plants.
1. Biological filtration method
Biological filtration deodorization is currently a widely researched, mature, and widely used biological deodorization method. This deodorization method involves passing the collected exhaust gas through a filling material filled with microorganisms under suitable conditions. The odor source material is first absorbed by the filling material and then oxidized and decomposed into carbon dioxide and water by the microorganisms on it, thereby removing the odor.
During the deodorization process, microorganisms growing on solid carriers play an important role in substance conversion. Microbial growth requires sufficient organic nutrients, so solid carriers should contain
There is a certain concentration of organic matter. At the same time, in order to maintain the activity of microorganisms, it is necessary to create a good living environment for them. During the operation process, attention should be paid to controlling temperature, humidity pH、 Nutrient and other indicators.

2. Biological absorption method
Biological absorption method (also known as biological washing method) often uses activated sludge method to transfer odorous components into water first, and then treat the contaminated water with microorganisms. According to the gas-liquid contact method, it can be divided into two forms: aeration and washing. Aeration type is similar to biological aeration in sewage treatment plants, except that odor is injected into activated sludge instead of air. The equipment used is usually an aeration tank with an air flow rate of 0.1-1mm/s. This method is applicable to various types of odorous gases and has good results. Its removal rate is related to the concentration of sludge pH、 Dissolved oxygen (DO) and aeration intensity are related.
The washing method uses a microbial absorption solution composed of microorganisms, nutrients, and water to treat exhaust gas. This method is suitable for absorbing soluble gaseous substances. The microbial mixture that absorbs exhaust gas is then subjected to aerobic treatment to remove pollutants absorbed in the liquid. The treated absorption solution can be reused. In the biological washing method, microorganisms and their nutrient ingredients exist in the liquid, and pollutants in the gas are transferred to the liquid through contact with the suspension for microbial degradation.

Carrousel oxidation ditch denitrification and phosphorus removal process
Traditional Carrousel oxidation ditch process
The Carrousel oxidation ditch was developed and researched by the Dutch company DHV in 1967. Its development purpose is to meet the requirements of fully mixing the mixed liquid in deeper oxidation channels and maintaining high mass transfer efficiency, in order to overcome the shortcomings of small oxidation channels with shallow depths and poor mixing effects. Up to now, more than 850 Carrousel oxidation ditch systems are in operation worldwide. Practice has proven that this process has the advantages of low investment, high processing efficiency, good reliability, convenient management, and low operation and maintenance costs. The Carrousel oxidation ditch uses a vertical surface aerator installed at one end of the ditch, thus forming an oxygen rich zone near the downstream of the aerator and an oxygen deficient zone upstream, which is conducive to biological flocculation and makes the activated sludge easy to settle. The designed effective water depth is 4.0-4.5 meters, and the flow rate in the ditch is 0.3 meters per second. The removal rate of BOD5 can reach 95% -99%, the nitrogen removal efficiency is about 90%, and the phosphorus removal efficiency is about 50%. If iron salt is added, the phosphorus removal efficiency can reach 95%.

Single stage Carrousel oxidation ditch denitrification and phosphorus removal process
There are two forms of single-stage Carrousel oxidation ditch: one is the Carrousel oxidation ditch with an anoxic section, which can achieve partial denitrification in a single tank and is used in situations where partial denitrification is required but the requirements are not high. Another method is the Carrousel A/C process, which involves adding an anaerobic tank upstream of the oxidation ditch to improve the settling performance of activated sludge and effectively control its expansion. The phosphorus content in the effluent is usually below 2.0mg/l. The above two processes are generally used for the renovation of existing oxidation ditches, with little change compared to the standard Carrousel oxidation ditch process, equivalent to the A/O and A2/O processes of traditional activated sludge processes.
Jointly built Karusel oxidation ditch
A biological nitrogen and phosphorus removal process (Carrousel 2000 model) designed by EIMCO in the United States specifically for the Carrousel system, which combines anaerobic and aerobic zones to form an oxidation ditch. The main improvement in its construction is the establishment of an independent oxygen deficient zone within the oxidation ditch. There is an adjustable valve installed at the port of the return channel in the anoxic zone. According to the requirement of nitrogen content in the effluent, adjusting the opening degree of the valve can control the flow rate entering the anoxic zone. The key to constructing a co built oxidation ditch in the anoxic and aerobic zones lies in controlling the oxygen filling of the aeration equipment. It is necessary to ensure that the mixed liquid entering the reflux channel is in an anoxic state, creating a favorable environment for denitrification. There is a submersible agitator in the anoxic zone, which has the function of mixing and maintaining sludge suspension.
On the basis of the Carrousel 2000 model, adding a pre anaerobic zone can achieve the purpose of nitrogen and phosphorus removal, which is called A2/C Carrousel oxidation ditch.?

The four stage Carrousel Bardenpho system has added a second anoxic tank and a re aeration tank downstream of the Carrousel 2000 system to achieve a higher degree of denitrification. The five stage Carrousel Bardenpho system has added a second anoxic tank and an aeration tank downstream of the A2/C Carrousel system to achieve higher levels of nitrogen and phosphorus removal.
In summary, the anaerobic, anoxic, and aerobic oxidation ditch system can be divided into three-stage A2/O system and four - and five stage Bardenpho system, all of which are enhanced and repeated by the A/O system. Therefore, this process has a good denitrification and phosphorus removal effect, with a denitrification rate of 90% -95%.