Equipment Description:

I. Principle of Underground Wastewater Treatment Equipment
‌1. Multi-Stage Biological Treatment Process‌
Wastewater passes through pretreatment (screens intercept large impurities), a regulating tank (water quality and quantity homogenization), an anaerobic zone (organic matter hydrolysis and denitrification), an aerobic zone (organic matter oxidation and nitrification), an anoxic zone (denitrification and denitrification), and a sedimentation zone (sludge separation). Finally, it undergoes disinfection before discharge or reuse.
‌Anaerobic Zone: Anaerobic bacteria decompose large organic molecules, releasing biogas and performing preliminary nitrogen removal.
‌Aerobic Zone: Aerobic bacteria mineralize organic matter and nitrify ammonia nitrogen.
‌Anoxic Zone: Denitrifying bacteria convert nitrates into nitrogen gas, completing nitrogen removal.
‌2. Synergistic Effect of Biofilm and Activated Sludge‌
Combining the biofilm process (biofilm-forming microorganisms) with the activated sludge process (suspended microbial communities) improves organic matter degradation efficiency and shock load resistance, while reducing sludge production.

II. Core Structure
1. Pretreatment Unit
Screens: Intercept large particles such as hair and plastic to prevent pipe blockage;
Equalization Tank: Buffers water volume fluctuations and maintains balanced water quality.
2. Biological Treatment Unit
Anaerobic Zone: Utilizes elastic fillers to enhance microbial attachment, promotes organic matter hydrolysis, and denitrification;
Aerobic Zone: Equipped with aeration devices, oxygen is supplied through forced aeration or mechanical aeration;
Anoxic Zone: Utilizes an internal circulation design to achieve denitrification.
3. Post-Treatment Unit
Sedimentation Tank: Utilizes inclined tube or vertical flow sedimentation to separate sludge;
Disinfection Device: Utilizes UV or chemical disinfection to ensure effluent safety.
4. Intelligent Control System
Integrated PLC automatic control module monitors water quality parameters (such as DO and pH) in real time, automatically starts and stops aeration pumps, sludge return pumps, and other equipment, and supports remote monitoring.

III. Technical Advantages
1. Space Efficiency: The fully buried design allows for landscaping or roads, reducing floor space by over 70%.
2. Stable Operation: The modular design adapts to water quality fluctuations, and the effluent meets Class A standards of the "Pollutant Discharge Standards for Urban Wastewater Treatment Plants."
3. Convenient Operation and Maintenance: Low sludge production (sludge is discharged once every 90 days), and automated control reduces manual intervention.
4. Energy Saving and Low Carbon: The optimized aeration system reduces energy consumption by 30% compared to traditional activated sludge processes.

IV. Scope of Application
It is suitable for small- to medium-scale (20-500 m³/d) applications such as domestic sewage (rural areas, scenic spots, and residential areas), food processing wastewater, and hospital wastewater.

V. Technical Parameter Examples

Main structures and components:

I. Pretreatment Unit
1. Screens intercept large impurities (such as hair and plastic) in wastewater, preventing clogging of subsequent equipment. Filtering is performed in two stages: coarse and fine screens.
2. Equalization Tanks homogenize water quality and volume, buffering against fluctuations in wastewater flow. These tanks are typically constructed of reinforced concrete or fiberglass.

II. Biological Treatment Unit
1. Anaerobic Zone: Anaerobic bacteria decompose large organic molecules, while elastic packing enhances microbial attachment for initial nitrogen removal.
2. Anoxic Zone: Incorporating an internal circulation design, denitrifying bacteria convert nitrates into nitrogen gas, further removing nitrogen.
3. Aerobic Zone (Contact Oxidation Tank): Forced aeration or microporous aerators provide oxygen, promoting aerobic bacteria to degrade organic matter and nitrify ammonia nitrogen. Built-in modular or fixed biological packing increases the specific surface area.
4. Membrane Bioreactor (MBR) (Optional): Integrated MBR membrane modules replace traditional secondary clarifiers for efficient solid-liquid separation and improved effluent quality (significantly increasing turbidity and bacterial removal rates).

III. Post-treatment Units
‌1. Sedimentation Tanks: Inclined plate sedimentation tanks or vertical flow sedimentation tanks separate suspended sludge after biological treatment; sludge is lifted by air to the sludge tank.
‌2. Disinfection Tanks: Ultraviolet light or chemical disinfection (such as chlorine tablets) is used to ensure that the effluent meets microbial standards.
‌3. Clear Water Tanks: Store qualified effluent for reuse or discharge.

IV. Auxiliary Systems
‌1. Sludge Treatment System: The sludge tank collects sludge from the sedimentation tank and returns it to the biochemical tank via a sludge pump or periodically discharges it to the outside. This supports aerobic digestion to reduce sludge production.
‌2. Aeration System: Consists of a blower, aeration piping, and microporous aeration heads, providing oxygen to the biological treatment unit. The oxygen supply can be adjusted to optimize energy consumption.
‌3. Intelligent Control System: The PLC automation module monitors water quality parameters (such as dissolved oxygen and pH) in real time, controls equipment startup and shutdown, and issues alarms. It also supports remote operation and maintenance management.

V. Structural Materials and Layout
Main Materials: Fiberglass tanks or reinforced concrete structures are corrosion-resistant and suitable for underground environments.
Underground Design: The entire equipment is buried underground, allowing the surface to be restored to greenery or roads, saving space.

VI. Examples of Key Components

Features:

1.High cost performance: Based on the customer's product positioning and development strategy, and with economic affordability as the foundation, we achieve the best cost performance.
2.The advanced and meticulous design concept of the equipment, along with the highly automated industrial equipment, showcases the image of a modern and advanced enterprise.
3. It has high adaptability, meeting the current production requirements and reserving room for development, taking into account the needs of increased production and improved quality in the future.
4.Quality compliance strictly adheres to the ISO900 quality management system, with every minute detail of the entire equipment installation being strictly controlled.