Bio STP
In bio digestor technology anaerobic microbes perform fermentation under anaerobic conditions in anoxic environment. Since this is anaerobic condition, almost 99% organic waste mater gets degraded with hardly any sludge left over or H2S produced.
Bio-STP tanks are made up of FRP material. These are airtight and only treated effluent comes out of the tank.
The microbial load used in this process are developed by DRDO and can bio-degrade human waste (organic waste) in wise range of temperature and aby cleaning agent (in moderate quantity).
Shree Jee Bio-STP gives flexibility to design as per site conditions and customer’s comfort. We have a wide range of Bio-STP suitable for small houses, apartments, societies, factories and institutions. We have successfully installed more than 500 Bio-STP across the nation.
DISTINCTIVE ADVANTAGES OF BIO-STP
- Works on gravity
- Fast installation and ready for operation
- Disposes of human waste in a 100% Eco-friendly manner
- Generates colourless, odourless inflammable Bio-Gas
- Economically viable
- Inoculums charging is only once during the entire life of Bio-Digesters
- Doesn’t involve human intervention at any stage of its functioning
- Minimum maintenance
- Can be installed in a smaller space as compared to Normal STPs due to underground construction
- Absolutely clear odourless water discharge.
- Discharge water is full of nutrients and minerals and is good for irrigation purpose of nearby gardens, lawns etc.
- No dependence on the limited and costly conventional energy source
- More Hygienic than normal STPs
- All pathogens are killed inside the Bio-digester Tank
- Suitable for any geoclimatic conditions, malls, offices, residential societies, and Institutions
- Complete elimination of pathogens

Normal-STP | BIO-STP | |
Waste Degradation | Aerobic dominant | Anaerobic |
Design | Design complex | Very simple design and easy to maintain DRDO technology |
Waste Decompositions | 30% pathogen reduction | 99% pathogen reduction |
Additives | Periodic addition | One time charge |
Sludge formation | Yes | No |
Maintenance | Required regular cleaning | Maintenance free |
Discharge | Odorous, harmful discharge | Odourless, colourless, safe for gardening |
Toilet Cleaning agent | Not recommended | Permitted |
Size | 3 times bigger than bio-STP | One third of normal STP |
Eco-friendly | No | Yes |
Space required | Required larger space above ground | Required less space |
Installation Cost | Higher | Lower |
Quality | Inferior to Bio-STP in terms of BOD, COD, pathogens and smell | Superior to Normal STP in terms of BOD, COD, pathogens, and smell |
Effluent Gas | CO2 H2S | Biogas composed of CO2 and Methane |
Installation | Limitation and space requirement | Suitable in any geoclimatic condition |
Modular design | No | Yes |