DSP Small Wastewater Treatment Plants

DSP Small Wastewater Treatment Plants

Hydraulic loading:

DSP-SH-05B, 0.5m3/Day
DSP-5P, 1m3/Day,
DSP-7P, 1.4m3/Day

How it Works

By using the proven biofiltration technology, DSP plants combine the best elements of anaerobic and aerobic digestion to provide superior wastewater treatment. Microorganisms attached to the surface of the plants’ media efficiently degrade the organic pollutants in the wastewater.

Treatment Process

1. Pre-settling Chamber

This chamber is designed to physically separate solids (sludge) and floating materials (scum) from the incoming water.

2. Anaerobic Chamber

This chamber contains plastic media. Microorganisms attached to the surface of the media degrade and digest organic substances in the wastewater, significant removing organic pollutants.

3. Aerobic Chamber

There is adequate dissolved oxygen as a result of the aeration of air pump. Thus aerobic bacteria thrive on the surface of plastic media and they oxidize and degrade organic contaminants. The filter media in the aeration chamber are backwashed regularly by the backwash system located at the bottom of the chamber. The backwashed effluent is transferred by air lift back to the pre-settling chamber for further digestion.

4. Clarification Chamber

The water flowing to the clarification chamber may carry small quantity of detached biofllm, which shall settle to the bottom and be transferred to Pre-settling tank for further treatment.
The treated effluent is ready for surface discharge or being transferred to the soil application system (depends on the local regulation).

Features of DSP Plants

Advanced Performance

The systems are designed for installations in environmentally sensitive area and the effluent can meet:
BOD≤20mg/L SS≤20mg/L

Nutrient removal (Optional)
Nitrogen removal

In anaerobic chambers, nitrogen-removing microorganisms grow on the surface of filter media. The microorganisms convert nitrates in the re-circulated water coming from the aerobic chamber to nitrogen gas which returns to the atmosphere without causing any harm.


The disinfection device is installed near the outlet. The treated effluent is air lift to the disinfection chamber, where the effluent makes contact with the chlorine tablets stored in a canister. The contact time can be adjusted via the flow adjustment valve.

Flow rate adjustment

Flow rate adjustment device easily controls the volume of both effluent water and re-circulated water.



Phosphorus removal

Througn electrolytic process of electrodes in the wastewater, phosphate is generated and
precipitated, thus removing phosphorus.

Automatic backwash

Automatic backwash controlled by timer ensures:
stable and highly efficient treatment performance automatically controlling the thickness of bio-film on the filter media better nitrogen and SS removal the filter media not clogging

Why choose DSP plants

  1. With a built-in pre-settlement tank, no additional septic tank is needed unless the local regulation requires otherwise.
  2. The specific surface area of the aerobic media is as high as 500m21m3. The available biomass per unit volume is much higher. Thus it can easily adapt to variable flows and loads. Comparably it requires shorter hydraulic retention time and smaller foot print.
  3. Low operation cost and easy maintenance
  4. 100% pre-assembled and lightweight ensures easy installation
  5. Weather-resistant and extremely durable tanks