Society for Renewable Energy Technology (SREE TECH) trivandrum is an approved service provider and manufacturer of waste treatment project for solid waste management and handling by Government of Kerala vide G.O. (Rt) No. 796/05/LSGD dt. 3/3/2005 of Clean Kerala Mission. Sree tech is also a trained and approved Bio-gas Contractor of ANERT. (Agency for non conventional Energy and rural technology) Government of Kerala for setting up of waste treatment plant for recovery of Energy in accordance with the ministry of non conventional Energy sources, MNES, Government of india, it is also registered SSI units for manufacturing of NRSE (new and renewable sourse of energy devices). we have been in the field since 1999. our all installations are working satisfactorily.

Waste to Energy Projects

Back Ground
Generation of waste both in the solid and liquid forms, is associated with the various activities of humanbeing. It is generally generated in urban, municipalities, domestic and industrial sectors. The solid waste includes human excreta, household waste, city garbage, fruit and vegetable waste, market waste, commercial waste, slaughter house waste and industrial waste. The liquid form includes domestic sewage and effluent from the community, institutional and industrial activities. It is the fact about 0.4kg per capita per day of municipal solid waste is generated in urban areas. Similarly about 150 litres of per capita per day sewage waste is also generated. Due to improper waste management facilities and treatment, these waste find their way into the environment. However due to strict pollution control measures, it is impertive to treat the waste in a hygenic way and ensure its safe disposal. Problem of waste could be mintigated through adoption of improved and scientific methods and environment friendly technologies for collection, treatment and processing before it is disposed off. These technologies not only reduce the quantity but also improve the quality of the waste to meet the pollution standard, besides genrating substantial amount of energy. New technologies are available to harness energy and power as bye products of tretment process.

Socio - Economic Environment Benefits
Clean environment, better sanitation and hygiene
Convinient utilisation of waste
Effective saving in fuel cost
Generation of power
Prevent deforestation
Employment generation
Carbon abatement and green gas emission .Etc.

Anaerobic fermentation technologies is the best suited technologies for bio -degaradable waste to harness energy power and bio fertiliser. Bio-gas production technologies is based on the phenomenon of biological decomposition of organic material in the absence of air. Different groups of bacteria act upon complex organic material in the absence of air produces bio-gas rich in Methane. During decomposition of waste in a bio-gas unit, most of the disease causing hook worm, round worm etc. are killed. The digested slury remains free from foul smell and most of the pathogens. Mosquitoes and files do not breed in the digested slurry. Bio-gas considered a better fuel than natural gas and LPG because it does not contain sulphur, also bio-gas units improves sanitation. The main factors influence, bio-gas production is depends on airtightness of the unit, PH, CN ratio, temperature, total solid content present in the waste and toxic content.

Types Of Design

(a) Floating gas holder digester (KVIC and ANERT approved)
(b) Fixed Dome RCC digester (ANERT /MNES approved)

Basic Component Of The System

1. Bio-reactor or fermantation chamber
2. Gas holder or gas storage chamber
3. Inlet tank
4. Out let tank
5. Mixing and pre treatment tank
6. Gas outlet pipe and gas distribution and cleaning system
7. Displacement chamber
8. Pulvoriser machine
9. Bio-gas burner
10.Engine with alternator etc.

KVIC Floating Drum Model

KVIC floating drum model is the apt one for anaerobic digestion of canteen and mess waste. This plant comprises of Bio reactor tank with a partition wall built under the ground with RCC and brick man masonery. The digestor should be of water proof. The gas holder is a blancing tank for continuously recieving the gas produced in the digester and delivering it at a predetermined pressure to the user end. The gas holder is fabricated in steel sheets and welding skill. The gas holder is coated with FRP (fiber reinforcement plastic) for two layers for anti corrosion, gas leak and for long life. The gas holder is also act as a cover of the digester. The plant has inlet and outlet provision for slurry movement.

Fixed Dome Digester Model
Fixed dome, (NEDA, UP and ANERT approved) bio-gas plant are being adopted for treating the waste for recovery of energy. It is usually builty below the ground level with RCCN and brick masonery. The vertical wall of the digester and dome built in RCCand brick masanery. The digester should be of water proof. The gas portion is built in RCC and has a displacement chamber. Normaly the waste undergoes anaerobic fermentation process for 40 days in the digester. The life span of the plant is more than 30 years. The plant has inlet and outlet provision for slurry movement. Under optimum process, a high gas yield of 0.96m3/kg of volatile solid is obtained.

Approximate Composition Of Waste (% Dry wt)

Moisture - 74%
Total solid - 26
Volatile solid - 95
Ash - 5
Carbon - 52
Nitrogen - 3.5
Cellulose - 10.4
Protien - 22
Starch - 32
Lignin - 4 etc...

Gas Equivalent

1. 1M3 Bio gas 0.42 Ltrs of Diesel
2.1M3 Bio gas 0.62 Ltrs of Kerosene
3. 1M3 Bio gas 3.5 kg Fire wood
4. 1M3 Bio gas 1.25 KW Electricity

Reduction Of Global Warming
Anaerobic digestion occuring in natural and in man made lagoons, land fills, and waste dumps release biologically produced CH4 to the tune of over 250 millons tonnes per annum. CH4 gas traps heat 30 times more than that by CO2 and contributes to 18% of the global warming. A 20% reduction in global warming can be achieved by converting organic wastes and residues to bio-fuels.