In the absence of oxygen, microorganisms degrade organic contaminants in anaerobic wastewater treatment. Water enters a bioreactor receptacle in a basic anaerobic treatment cycle. The bioreactor contains sludge, a thick, semi-solid substance made up of anaerobic bacteria and other microorganisms.
These anaerobic microorganisms, or "anaerobes," digest the biodegradable matter in the wastewater, resulting in effluent with lower BOD, COD, or TSS, as well as biogas by-products.
What is high rate anaerobic sewage treatment?
Modern high-rate reactors are extremely compact, with volumetric loading rates of up to 30-40 kg COD/m3 per day. The energy output per day can reach 400 MJ/m3reactor installed. The excess sludge produced by these reactors is small but of high quality. It even has a monetary value!
High-rate anaerobic treatment has emerged as a viable alternative, for the treatment of many industrial and municipal wastewaters due to its ability, to properly separate hydraulic and solid retention durations. High-rate anaerobic treatment systems can tolerate relatively short hydraulic retention durations, because significant biomass concentrations can be stored in the system.
Need for change in anaerobic treatment systems
The development of psychrophilic high-rate anaerobic treatment systems, will undoubtedly have a significant economic and ecological impact, due to the numerous advantages of anaerobic treatment systems over conventional aerobic treatment systems.
The viability of high-rate anaerobic reactor systems for cold wastewater, is primarily determined by
(i) the quality of the seed sludge in the reactors used and its development under psychrophilic conditions;
(ii) the nature of the organic pollutants in the wastewater;
(iii) the reactor design, particularly its ability to retain viable sludge.
The Benefits of High-Efficiency Anaerobic Treatment Systems
(i) The challenge for anaerobic technology is to broaden its applicability to lower-level wastewaters, such as sewage and residential effluent. Direct sewage treatment is unquestionably an appealing and acceptable option, particularly for poor nations, because anaerobic techniques require less initial investment and require less maintenance, than standard aerobic processes and produce less sludge.
(ii) Because, of the possibility of anaerobic process applications in both centralized and decentralized forms, these technologies are intriguing. The investment costs of sewage systems are greatly reduced, when anaerobic operations are carried out decentralized. Before being reused or disposed of, both primary and biological sludge from aerobic treatment facilities, must be stabilized.
(iii) If a practical process design is used and the organisms are acclimatized to desirable temperatures, the reactors can be operated even under psychrophilic conditions, and biomass adaptation allows for a high treatment capacity in the anaerobic process.
(iv) Additionally, usable sludge can be stored unfed. Anaerobic sewage treatment is promoted, particularly in tropical areas, because it allows for much lower treatment costs, due to its ability to function at low temperatures (10-20°C).
If you have any questions about wastewater treatment plants, or if you would like to discuss about high-rate anaerobic sewage treatment, please contact the Netsol Water team right away. Our team is an expert in wastewater treatment and can help you tailor a solution to your specific requirements.
We collaborate with our clients to design a customized water treatment solution that meets your specific requirements, as well as an on-going service plan to completely or partially maintain your system.