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STP

Page history last edited by CPN 11 years ago

Sewage Treatment Plant .

  • Status Complete
  •  Total costs of the project is 45L - 2006.  
  • 2008 July - it stands at 54L
  • Payment Information <<StpPayment>> 
  • Official Communication(s) <<Communication>>
  • Completion <<stpcomplete >>

 


 

Introduction

The residents of  Laughing Waters Ramagondanahalli, Bangalore560 066 represented by their Association LWORA, have  integrated  an  environmental friendly and low maintenance Waste Water Treatment plant for treating the domestic black and grey water generated within  the colony. The treated effluent is proposed to be utilized for secondary use like irrigation of the landscape.

 

The fundamental criteria for choosing the DTS is that it is an environment friendly and low maintenance waste water treatment option for treating the domestic black and grey water. The system is not dependant on electricity for its treatment and its installation cost is comparable to conventional STP. The treated effluent shall conform to the KPSCB norms and can  be utilized for secondary use like toilet flushing and irrigation of the landscape.

 

Where is the official communication 

You will find the communication sent by Dr. Somaiah , President of LWA. STPCommunication

 

 

Who are the experts.

Paradigm Environmental Strategies Pvt. Ltd.,

Pravinjith K.P.

email :pravinjith@gmail.com

 

What is a DTS

DTS stands for Decentralized wastewater Treatment Systems. It qualifies as an “Appropriate Decentralized Environmental Protection Technique” (ADEPT). All ADEPT applications are based on the principle of low-maintenance since most of the important parts of the system work with zero or minimal external energy input. ADEPT application provides state of the art technology at affordable prices because materials/inputs used for construction are locally available.

 

  • DTS is suitable for wastewater for both, domestic and industrial sources
  • DTS can cater to wastewater flows of 1-1000 KLD
  • DTS are reliable, long lasting and resistant to shock loads
  • DTS do not warrant skilled maintenance    

 

What Does DTS Consists of ?

  • Settler
  • Baffeled Reactor
  • Anaerobic Filter 
  • Planted Gravel filter

 

The Below diagram shows all the above in a snapshot.

 

 

 

Settler

 

 

Settler

The Settler is similar to a septic tank but with low hydraulic retention times. The key processes are physical treatment which retains contaminants by sedimentation/flotation and biological treatment whereby the remaining organic pollutants in the clarified wastewater are partly decomposed by microorganisms. The digestion process ensures that the accumulated sludge is reduced and stabilised. Storage volume for sludge is provided for 18 to 24 months, defining the desludging period. Average reduction of BOD is between 20 and 40% . The Settler is resistant to shock load and variable inflow.

  Settler has been constructed in the first phase.

 

 

 

 

Baffelled Reactor

 

Baffelled Reactor
Also known as Fluidized Bed Reactor

The Fluidized Bed Reactor consists of a series of chambers, in which the wastewater flows up-stream. Activated sludge is located at the bottom of each chamber.

 

 The inflowing effluent is intensively mixed up with the  sludge, wherein it is inoculated with bacterial mass which decompose the contained pollutants. In the first chambers the easily degradable substances are broken down. In the following chambers, decomposition of less decomposable substances takes place.

 

 

 

 

 

 

 The BOD reduction rate of the Fluidized Bed Reactor is 90 % . The pathogens reduction is in the range between 40 – 75 %. The Fluidized Bed Reactor is resistant to shock load and variable inflow, the operation and maintenance is simple and virtually no space is required since it is an underground  Construction.  

 

 

Anaerobic Filter

 

Anaerobic Filter
Fixed Film Reactor

The Fixed Film Reactor (FFR), also known as fixed bed or Anaerobic Filter Reactor is very similar to the Fluidized Bed Reactor (FBR). The bacterial mass is lodged on filter materials such as gravel, rocks, cinder or specially formed plastic pieces which provides additional surface area for bacteria to settle. Non-settleable and dissolved solids are treated by bringing them in close contact with a surplus of active bacterial mass fixed on filter material.

 

The picture shows the combination of an FFR with a settler. The FFR could also be combined with a Fluidized Bed Reactor by incorporating the FFR as the last chamber.

 

 

 

 

 

The BOD removal rate is in the range of 70-90% . The surplus of activated sludge produced has to be removed in intervals of 1 to 3 years.

 
 

 

 

Planted Gravel filter 

 

Planted Gravel Filter
 

 

 

 

Reduction rate of BOD is between 75 - 90 % . Reduction of infective organisms is over 95 %. Operation and maintenance of the system is simple. The spatial requirements are compensated by integrating it with the landscapes

 

The Planted Gravel Filter (PGF) also known as Root Zone treatment system is made of reed planted filter bodies consisting of fine gravel. Bottom slope is 1 %. The flow direction is mainly horizontal. The filter is planted with helophytes. The main removal mechanisms are biological conversion, physical filtration and chemical adsorption. Mechanisms of BOD removal are mainly aerobic and anoxic .

 

The function of the PGF is mainly post treatment.

 

Plant Gravel will be in the main park. Water shall be pumped from the first phase. The gravity is such that from the park, the treated water can be used for the tree park, side lanes on the main avenue, 2nd 4th main.

.

 

How often should DTS be cleaned ?

 

Sludge generation and disposal

Sludge will be produced in the settler and the Fluidized Bed Reactor. The design provides integrated storage volume for a period of 18 to 24 month.

 

Disposal:

Regular disposal through BWSSB every 18 to 24 months. An onsite processing through the installation of drying beds attached to the DTS could be an alternative option due to the fact that the sludge produced will be harmless and rich in plant nutrients.

 

What do we do with the Waste Water

 

About 30% of the treated wastewater is lost by evapotranspiration by the plants in the PGF. The outflow from the planted gravel filters is routed to individual underground sumps and pumped for landscaping  purposes. Thus a total of 120 KLD would be available for landscaping  purposes.

 

The water that is generated can be pumped back into the park. This water is very rich in minerals. A Pump with an Auto Level controller can be installed to pump the excess water.

***Update 2013 ***

1. All waste water is being pumped to the Park.

2. The water water is being used to water the Park and surrounding area. 

 

 

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