This is simply referred to as Anaerobic Wastewater Treatment System; A solution for sanitation, wastewater treatment, and renewable energy. Anaerobic wastewater treatment consists of a variety of approaches for collection, treatment, and dispersal/reuse of wastewater for individual dwellings, industrial or institutional facilities, clusters of homes or businesses, and entire communities.

Anaerobic wastewater treatment differs from conventional aerobic treatment. The absence of oxygen  leads  to  controlled  conversion  of  complex  organic  pollution’s,  mainly  to  carbon  dioxide  and  methane.  Anaerobic  treatment  has  favorable  effects  like  removal  of  higher  organic  loading,  low  sludge  production,  high  pathogen  removal,  bio-gas  gas  production  and  low  energy  consumption.  Anaerobic  treatment  can  be  an  attractive  option  to  conventional  anaerobic  digestion  for municipal sewage and industrial waste-waters that are discharged at moderate to low temperature.
Keywords;  Anaerobic bio-degradation, anaerobic processes, anaerobic wastewater treatment, energy recovery

An evaluation of site-specific conditions is performed to determine the appropriate type of treatment system for each location. These systems are a part of permanent infrastructure and can be managed as stand-alone facilities or be integrated with centralized sewage treatment systems.

They provide a range of treatment options from simple, passive treatment with soil dispersal, commonly referred to as septic or onsite systems, to more complex and mechanized approaches such as advanced treatment units that collect and treat waste from multiple buildings and discharge to either surface waters or the soil. They are typically installed at or near the point where the wastewater is generated.

The following are the various forms of Decentralized Waste Water Treatment systems and their target groups: