Anaerobic digestion in wastewater treatment plants produces a methane-rich byproduct, biogas, which can be used as an energy source. In large wastewater treatment plants, anaerobic digestion breaks down organic waste. The process produces digester gas by breaking down sewage sludge from primary or secondary purifiers.

Digester is biogas. Its composition varies, but the main components are methane (CH4) and carbon dioxide (CO2). Trace amounts of nitrogen (N2), oxygen (O2) and hydrogen sulfide (H2S) may also be present. Although gas compensation fluctuates depending on temperature and process, methane-rich gas (about 60-75% CH4) becomes an attractive energy source. Biogas can be burned in engines to generate electricity or to heat digestion tanks to accelerate decomposition. In addition, biogas can sometimes supplement natural gas to heat the facility.

Innovative biogas digester
Innovative biogas digester

The main functions of biogas digester wastewater treatment for example to treat farm wastewater: Firstly, it reduces the COD content of the wastewater, with a removal rate of more than 85% COD, often the digesters of farms are not fully fermented that is discharged. Secondly, the livestock manure is harmlessly treated.

In order to comply with local policies and industry norms for standard discharge, it is necessary to let livestock and poultry manure fully fermented, and then the digestate and digestate are separated and treated. The digestate can be used as organic fertilizer. The digestate enters the impermeable storage tank for settling. At the end of the impermeable storage pond, a biological purification pond is then built, and the precipitated digestate can be discharged into the purification pond, where aquatic plants are planted for treatment.

Using the biogas generated from sewage treatment, firstly, we should improve the biogas collection and storage system. Utilization methods are.

  1. Biogas agitation, using the biogas generated to agitate the primary and secondary sludge digesters to promote the digestion process.
  2. Biogas heating, using biogas to burn boilers, the heat generated will be used as a medium for water, through a special circulation pipeline, to heat the sludge digestion tank; in alpine regions can also be heated to the water treatment area.
  3. Biogas power generation, provided that the amount of biogas produced is stable and can meet the demand of the generator, and most of the electricity produced is for self-use.
  4. Community residential life heating, applied to boiling water room, canteen, dormitory, etc., this is the most used biogas utilization.

Anaerobic wastewater digestion system is a series of processes in which microorganisms break down biodegradable materials in the absence of oxygen. Anaerobic digestion effectively reduces the amount of organic material and utilizes it. Whether converting waste to energy or conditioning biosolids prior to treatment, KUOSI offers complete wastewater treatment solutions and equipment. Helping to capture biogas for conversion into usable energy. Improves biogas utilization by combining sewage sludge, food waste and manure in an anaerobic digester. Equipment such as dissolved air flotation systems and roots blowers are often used. Contact us for equipment quotes or to inquire about industry solutions.