Products Description
The compact sewage treatment plant is equipped with underwater aeration and dual-function water flow-driven aerators. When treating sewage, the sewage flows into the aeration zone from the top of the device. The aerator operates underwater, aerating and stirring the sewage. The incoming sewage quickly mixes with the original mixed liquid, adapting to changes in the inlet water quality. The aerator utilizes the dual functions of water flow and underwater aeration to create a regular circulation of sewage in the aeration zone, rapidly increasing the dissolved oxygen content. Since the sewage circulates continuously in the aeration zone, the water quality at each point remains relatively uniform, and the number and nature of microorganisms are generally consistent. This ensures that the working conditions throughout the aeration zone are nearly identical, optimizing the entire biochemical reaction. Organic matter is gradually degraded by microorganisms, purifying the sewage.
The compact sewage treatment plant uses the activated sludge method to purify sewage. The equipment works by utilizing the life activities of aerobic bacteria. The biological flocs formed by microorganisms in the sewage destabilize and flocculate the suspended and colloidal organic pollutants. These pollutants are then adsorbed onto the surface of the activated sludge, where they are degraded, significantly reducing the BOD and COD levels in the water.
This system is suitable for domestic sewage treatment in residential areas, tourist attractions, hotels, sanatoriums, schools, mines, factories, and similar industrial sewage treatment applications.
Features
The structure is reasonable and compact, allowing it to be buried underground, which helps with heat preservation. It can operate normally even in cold winters (-30°C) and adapt to harsh climatic conditions. It can also be placed in a pond, utilizing the terrain to blend into the surrounding environment and reduce the required floor space. There is no pollution, no noise, and no odor, which helps minimize secondary pollution.
The system is not limited by the amount of sewage and is flexible, allowing it to be used individually or in combination. Therefore, it is suitable for installation near residential areas, tourist attractions, hotels, villas, barracks, schools, and other living spaces, without the need to lay extensive sewage collection pipelines. If the water volume is large, it can be arranged in clusters for central treatment and set up as a small sewage treatment plant (station).
The device is made from fiberglass prefabricated components that are produced in the factory and assembled on-site. It is simple to operate and easy to maintain.
Fully automatic control with a high degree of automation, low energy consumption, low management costs, and no need for personnel management.
No sludge backflow, low noise, and no odor.
Lightweight, easy to transport, easy to install, corrosion-resistant, and has a long service life.
High purification efficiency, with a BOD removal rate of 80% to 90%.
The equipment is buried underground and has excellent water discharge performance. The surface greening rate can exceed 90%, and the sewage treatment project can be arranged as a landscape. If cold-resistant, water-loving tree species or lawns are used, a water treatment landscape incorporating streams, fountains, ponds, and fish ponds can be created, transforming turbidity into clear springs. This not only treats sewage but also enhances the environment.
Process Description
The design of domestic sewage treatment equipment is primarily intended for the treatment of domestic sewage and similar industrial organic sewage. The main treatment method used is the currently more mature biochemical treatment technology – the contact oxidation method. The water quality parameters are designed based on typical domestic water quality, with an inlet BOD of 200 mg/L and an outlet BOD of 20 mg/L. The system consists of six main parts:
Primary sedimentation tank
Contact oxidation tank
Secondary sedimentation tank
Disinfection tank and disinfection device
Sludge tank
Fan room and fan
The domestic sewage treatment equipment is described as follows:
Primary Sedimentation Tank: The primary sedimentation tank of the buried domestic sewage treatment equipment is a vertical-flow sedimentation tank. The rising flow rate of sewage in the sedimentation tank is 0.6-0.7 mm/s. The precipitated sludge is lifted to the sludge tank by air. (Note: For capacities between 0.5–5 m³/h, there is no primary sedimentation tank.)
Contact Oxidation Tank: After primary sedimentation, the water flows into the contact tank for biochemical treatment. The contact tank is divided into three levels, with a total retention time of more than 1 hour. The contact oxidation time for enhanced equipment can reach 6 hours. The filler used is a novel trapezoidal, environmentally friendly material that facilitates film formation and prevents clogging. The specific surface area of the water treatment filler is 160 m²/m³, and the air-to-water ratio in the contact tank is about 12:1. (For capacities between 0.5–5 T/h, the contact tank is a second level.)
Secondary Sedimentation Tank: After biochemical treatment, the sewage flows into the secondary sedimentation tank, which consists of two vertical-flow sedimentation tanks that operate in parallel. The rising flow rate is 0.3-0.4 mm/s. The sludge is lifted to the sludge tank by air. (For capacities between 0.5–5 m³/h, the sludge flows into the sludge pool by gravity.)
Disinfection Pool and Disinfection Device: If the sewage is hospital wastewater, the retention time in the disinfection pool can be increased to 1–1.5 hours, and solid chlorine tablets are used for contact dissolution. The disinfection device can continuously adjust the dosage according to the water flow, ensuring that more dosage is used for higher water output and less for lower water output. Other disinfection devices can be prepared separately. (Note: If the system is used for industrial sewage, the disinfection pool and device can be omitted.)
Sludge Pool: All sludge from the primary and secondary sedimentation tanks is lifted into the sludge pool by air for aerobic digestion. The clear liquid in the sludge pool is returned to the contact oxidation tank for further treatment. There is little residual sludge after digestion, and it is generally cleaned once every 1–2 years. The cleaning method involves using a fecal suction truck, which extends into the bottom of the sludge pool through the inspection hole to suck out and transport the sludge. (For capacities of 0.5–5 T/h, the sludge is digested anaerobically.)
Blower Room and Blower: The blower room is located above the disinfection tank. The inlet is double-layer sound-insulated, and the air inlet is equipped with a muffler and blower filter, ensuring no noise during operation. The fan system consists of two Roots blowers, which can automatically alternate operation. The operating life of each blower is approximately 30,000 hours.
Relationship between treatment capacity of compact sewage treatment plant and inlet and outlet BOD
| inlet BODmg/L | 200 | 300 | |
| outlet BODmg/L | 20 | 20 | |
| flow rate (m³/h) |
A-0.5 | 0.5 | 0.4 |
| A-1 | 1 | 0.8 | |
| A-3 | 3 | 2.4 | |
| A-5 | 5 | 4 | |
| A-10 | 10 | 8 | |
| A-20 | 20 | 16 | |
| A-30 | 30 | 24 | |
| inlet BODmg/L | 400 | 200 | |
| outlet BODmg/L | 20 | 30 | |
| flow rate (m³/h) |
A-0.5(model) | 0.33 | 0.5 |
| A-1 | 0.65 | 1 | |
| A-3 | 1.95 | 3 | |
| A-5 | 3.25 | 5 | |
| A-10 | 6.5 | 10 | |
| A-20 | 13 | 20 | |
| A-30 | 19.5 | 30 | |
| inlet BODmg/L | 300 | 400 | |
| outlet BODmg/L | 30 | 30 | |
| flow rate (m³/h) |
A-0.5 | 0.4 | 0.38 |
| A-1 | 0.9 | 0.75 | |
| A-3 | 2.7 | 2.55 | |
| A-5 | 4.5 | 3.75 | |
| A-10 | 9 | 7.5 | |
| A-20 | 18 | 15 | |
| A-30 | 27 | 22.5 | |
| inlet BODmg/L | 500 | 300 | |
| outlet BODmg/L | 30 | 60 | |
| flow rate (m³/h) |
A-0.5 | 0.3 | 0.5 |
| A-1 | 0.6 | 1 | |
| A-3 | 1.8 | 3 | |
| A-5 | 3 | 5 | |
| A-10 | 6 | 40 | |
| A-20 | 12 | 20 | |
| A-30 | 18 | 30 | |
| inlet BODmg/L | 400 | 500 | |
| outlet BODmg/L | 60 | 60 | |
| flow rate (m³/h) |
A-0.5 | 0.43 | 0.38 |
| A-1 | 0.85 | 0.75 | |
| A-3 | 2.55 | 2.55 | |
| A-5 | 4.25 | 3.75 | |
| A-10 | 8.5 | 7.5 | |
| A-20 | 17 | 15 | |
| A-30 | 25.5 | 22.5 | |
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