sanitation

Current scenario

  • 1.56 billion liters of untreated sewage flows into River Ganga every day
  • 75% of surface water resources are polluted and 80% is due to sewage alone
  • 61% of rural india and 10% of urban india defecate in the open

Our Work In This Sector

Bio Digesters

Bio Digester is a specially engineered fermentation tank which facilitates the process of anaerobic degradation of human waste converting it into water and methane

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Bio Toilets

Bio toilets is a combination of a Toilet shelter and Bio digester tank. This system can be designed and customized to cater to the exact requirement of the user.

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Comparison chart of Bio Digester and Septic Tank

Sl no

Characteristic

Septic tank

DRDE Bio Digester

1

Nature

facultative

Anaerobic

2

Human waste decomposition

Minimal waste decomposition (only 20-40%) resulting in high residual waste.

More than 90% solid waste is decomposed into gases and water.

3

Air pollution

Foul smelling H2S is emitted.

Emits natural methane and CO2.

4

Water pollution

As there is minimal waste decomposition, the effluent is polluting.

The remaining effluent is minimally polluting, pathogen free and can be easily discharged.

5

Pathogen reduction

Aerobic process - most of the diseases bearing pathogens remain active causing water borne disease.

Anaerobic, over 99% disease bearing pathogens are inactivated thus preventing spread of water borne disease.

6

Space requirement

Higher space for construction as it is designed for larger volume retention.

Requires 50% or less space as the waste gets decomposed and does not require higher retention.

7

Cost of construction

Larger volume for retention, the cost of septic tank is high.
This also requires soak pit which further add to cost and space.

Smaller volume- lesser cost - between 25% to 50% of a septic tank.

8

Operation and maintenance

Requires regular evacuation as the undecomposed waste fills up the tank frequently.

Does not require any evacuation or maintenance as the waste gets completely decomposed.

9

By-products

Septic tank does not yield any useful bi-product.

Bio digesters produces high quality balance nutrient rich effluent for horticulture.

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Bio Digester is a specially engineered tank which facilitates the process of anaerobic bio-degradation of human excreta. This process of anaerobic bio-degradation does not require any external energy for its operation which makes this system self-sustainable. The main by-products of this process are methane and water both of which can be recycled.
Our bio digesters are custom- designed and manufactured to meet the exact requirement of our clients.

Salient features of Bio digester:

  • Suitable for ambient as well as sub-zero temperature of Himalayan region, glaciers, plains of north India and coastal regions of south India.
  • In addition to human excreta, it can also be used for kitchen and animal waste disposal.
  • No dependence on the limited and costly conventional energy sources.
  • Easy to transport and install especially in hilly terrains.
  • Little or no maintenance requirement.
  • Significant reduction of pathogens.
  • Generation of odourless and inflammable biogas which can be used for energy generation.
  • Environmentally & economically superior to the existing practice of septic tanks and Leach pits.