There is no Sewerage System in most of the towns in Odisha at present. Most of the households discharge the sewage into natural drains and waterways causing serious public health and environmental hazards to the people. Some of the households use septic tanks followed by soak away pits for collection of sewage. In septic tanks the sewage effluent is allowed infiltrate into the ground via soakpit while sludge is accumulated in the tank. The sludge collected from the septic tanks is transported and disposed off randomly at various places in the town.
The untreated sewage in streams and waterways can be potential sources of sewage borne diseases as the sewage contains pathogens which can pose serious disease such as Cholera, Typhoid, Dysentery etc. Discharge of untreated sewage into streams or ponds also cause environmental degradation as the organic material in the sewage can deplete the oxygen content of the streams, ponds and other water bodies and thereby making them unsuitable for fish and other aquatic species to exist. Sewage contamination of low-surface ground water which will be used by the public for drinking purposes.
Sewerage treatment is the process of removing contaminants from wastewater. It includes physical, chemical, and biological processes to remove these contaminants and produce environmentally safe treated wastewater. Pathogens or disease-causing organisms are present in sewage which needs to be removed before the sewage can be released back into the environment. The objective is to reduce or remove organic matter, solids, nutrients, disease-causing organisms and other pollutants from the sewage.
Sewerage system projects are the thrust area sectors of OUIDF in terms of the agreement executed with KfW. For Focus area projects, 60% of the total fund received from KfW is to be invested in this sector.
It is proposed to set up a Sewage Treatment Plant (STP) on a modular approach in a phased manner as the population grows. An STP with capacity of 42 MLD at Bhatra proposed to serve all catchment areas of Sambalpur town for a design period 10 years. The treatment plant will be augmented every ten years as the population grows to meet the additional capacity. The ultimate design period of the plant is 30 years. The technology adopted for the Sewerage Treatment Plant is Activated Sludge Process (ASP). The process is widely used and relied upon by Water Authorities in municipal sewage works. The quality of sewage after treatment for disposal in river shall comply with National River Conservation Directorate (NRCD) Effluent Standards. The total Project Cost is Rs. 309 cr approx.
Rourkela East comprises mainly Koel Nagar, Jagada, Jhirpani and adjacent areas. The existing Sewerage System in Koel Nagar is not functioning well, as it has served its design life and it needs to be replaced. Abatement of pollution to river Koel will be achieved by providing Sewerage System to Rourkela East area. The estimated average sewage flow for year 2030 is 8 MLD and accordingly STP of 8 MLD based on Sequential Batch Reactor (SBR) technology has been proposed. The Sewerage System for Roureka East comprises laying of sewerage network of a total length of 46.4 Km which would cover all the 3 sewerage catchments of Rourkela- East. The quality of sewage after treatment for disposal in river shall comply with National River Conservation Directorate (NRCD) Effluent Standards. The total Project Cost is Rs.89 cr. approx.
Rourkela West is the Municipality area except Rourkela-East and Bondamunda which is a railway colony. The key components of the Project are Sewer Network of 189 Km, Four Intermediate Sewerage Pumping Station, one Terminal Sewage Pumping Station and one Sewage Treatment Plant of 40 MLD based on Sequential Batch Reactor (SBR) Technology. Additional Package Treatment Plant of 1 MLD is proposed at Tharpur area. The STP will cater to the demand upto 2030. The total Project Cost is Rs.315 cr. approx.