Engineering domestic sewage treatment equipment

The domestic sewage treatment equipment is a modular and efficient sewage biological treatment device, which is a sewage biological treatment system with biofilm as the purification main body. It fully utilizes the characteristics of high biological density, strong pollution resistance, low power consumption, stable operation, and easy maintenance of biofilm reactors such as anaerobic biofilters and contact oxidation beds, making the system have a wide range of application prospects and promotion value.


Working principle


Introduction to Anaerobic Biofilter


1. The principle of the effectiveness of anaerobic biofilters


1) Filtering effect: The packing material intercepts and filters large particles and suspended solids in the incoming water;


2) Hydrolysis effect: Anaerobic microorganisms can hydrolyze insoluble substances of large molecules into soluble substances of small molecules;


3) Absorption effect: Anaerobic microorganisms adsorb and absorb organic pollutants in water, some of which are used for their own growth and reproduction, and some are sealed with U-shaped water using biogas;


4) Denitrification effect: The effluent from the contact oxidation bed is refluxed to the anaerobic filter, and denitrifying bacteria in the anaerobic microorganisms can use the nitrate nitrogen in the reflux water and convert it into nitrogen gas to remove nitrogen substances from the wastewater.


After anaerobic filtration treatment, the concentration of suspended solids, organic pollutants, and nitrogen in village sewage decreased, and the subsequent load on the contact oxidation bed also decreased.


2. The principle of the effect of contact oxidation bed


1) Adsorption effect: During the growth and reproduction of aerobic microorganisms on fillers, they form biofilms with larger surface areas and higher concentrations, which can adsorb most of the organic pollutants in water and reduce the concentration of pollutants;


2) Absorption and decomposition effects: With continuous air flow into the reactor, aerobic microorganisms can absorb the adsorbed organic pollutants as nutrients and metabolize them. Some of them are used for their own growth and reproduction, while others are converted into carbon dioxide and water.


The contact oxidation bed further reduces the concentration of organic pollutants in village sewage, and the removal rate of CODcr and BOD5 in the effluent reaches over 80%, which can meet the national sewage discharge level two standard.


3. Working principle of sedimentation tank


1) By utilizing the gravity effect, suspended sludge with a specific gravity greater than that of water in the effluent from the contact oxidation bed can sink to the bottom of the tank, thereby removing it from the water and ensuring better effluent quality;


2) The sludge that settles to the bottom automatically returns to the contact oxidation bed to maintain the sludge concentration in the contact oxidation bed.


4. The disinfection pool uses solid chlorine to disinfect the effluent, which can effectively kill pathogenic microorganisms such as bacteria, Escherichia coli, and viruses in the water. The treated water is clear, transparent, odorless, and the bacterial and Escherichia coli counts meet the national sewage discharge standards.


Characteristics of buried daily sewage treatment equipment


Benefits of domestic sewage treatment equipment:


There are various processes for treating domestic sewage, and the most outstanding benefits are:


1. The equipment is buried underground and can be beautified on top, creating a beautiful environment.


2. The entire device generally does not require dedicated management.


3. It can reduce the footprint and build parking lots above the equipment without the need for building factories or other equipment.


4. The standards include no impact on the surrounding environment, minimal sludge generation, and noise levels below Class II areas.


5. The operation is concise, the technology is new, the effect is good, and the service life is long.


6. The equipment can be arranged according to standards or specially arranged according to terrain requirements.


Under what conditions is it suitable to choose buried daily sewage treatment?


The water volume is small, the concentration of pollutants is low, the composition is not messy, the site is limited, and the surrounding environment beautification factors need to be considered. In general, it is recommended to use domestic sewage treatment equipment systems for the above situations


Equipment application


1. Daily residential areas, villas, and office buildings


2. Hotels, canteens, and bathing centers


3. Small and medium-sized factories


4. Hospitals and small and medium-sized medical institutions


5. Stations, airports, docks, commercial districts


6. Tourist attractions such as parks and historical sites


7. Campus, military, and government agencies