Scope for Decentralized Wastewater Treatment System (DEWATS)

[keerthi sureshbabu]

 

DEWATS are effective, reliable , cost efficient and custom-made wastewater treatment systems, which are perfectly suited for small to medium size systems(5-1000m3 /d) on community level and for individual users like institutions, hospitals or enterprises(SME). On community level ,DEWATS can be integrated into a sanitation complex, which is operated on pay and use basis, ccreating income opportunities for local personal. DEWATS solutions are not intended to replace but rather to complement centralized systems in applicable areas.

The technical options within DEWATS are based on a modular and partly standardized design. DEWATS is based on basic technical treatment processes:

• Mechanical treatment (sedimentation and flotation) and
• Biological (anaerobic and aerobic) treatment.

The most common DEWATS modules are settlers, biogass settlers, anaerobic baffled reactors (ABR), anaerobic filters(AF), planted gravel filters(PGF) , and polishing ponds. These systems can be designed for individual needs.

Areas of application of DEWATS

• Where individual onsite systems fail and the community cannot afford the cost of a conventional wastewater management system
• Where the community or facility is remote from existing sewers
• Where local water reuse options are available
• Where existing wastewater treatment plant capacity is limited
• The expansion of the existing wastewater collection and treatment facilities would involve unnecessary disruption of the community,
• Where residential density is spare
• Specific wastewater constituents are treated or altered more appropriately at the point of generation.

Merits of DEWATS

• Cost efficient as no or only simplified underground sewer system needed.
• Low running costs and energy savings as no electrical devices needed.
• Minimal O&M needs and costs as lower human resources capacity levels needed.
• Reliable, long lasting and tolerant towards inflow fluctuation.
• High variety of local water, energy and nutrient reuse options.
• No ground water pollution.
• Easy and efficient user involvement and participation; and high user acceptance,
• Applicable on household, cluster and community level.

[Dr Prakash Tewari]

it is good and does'nt cause ground water pollution

 

[SANJAY AGGARWAL]

yes, I know about DEWATS and it is a good system to treat sewage without the use of energy or space. However, it does suffer from problems of: Foul odour and large area needed underground and consequent high cost. We have come up with a cross between DEWATS and septic tanks. Concept is the same however we have included powerful microbes called NatureVel - WW to eat into the organic matter, thereby reducing the need for space and also suppress foul odour within 2-3 days.