Faqs – Waste water Treatment plant

Why we need Waste Water Treatment Plant (WWTP)?

As the world has industrialized and its population has grown, the problem of water pollution has intensified. With numerous factories having no choice, inject untreated effluents directly into the ground, contaminating underground aquifers.

Another cause of water contamination is improper strategy of sewage treatment. Since human waste contain bacteria that can cause disease. Once water becomes infected with these bacteria, it becomes a health hazard. There are following sources of sewerage effluent as:

  • Residential apartment
  • Commercial complex
  • Public amenities/convenience
  • Labour camp/Defence/Refugee camp
  • Resorts & clubs
  • Factories/Industries

Effluent Treatment Plant

Waste management is the collection, transport, processing, recycling or disposal, and monitoring of waste materials, without affecting humans and other life systems and without disturbing the environment. The term usually relates to materials produced by human activity either at home / office / industry / agricultural fields / mines etc., and is generally undertaken to reduce their effect on health, the environment or aesthetics. Waste Management is also carried out to recover resources from it.

Sewage / Effluent Treatment Plant is a facility designed to receive the waste from domestic, commercial and industrial sources and to remove materials (containing physical, chemical and biological contaminants) that damage water quality and compromise public health and safety when discharged into water receiving systems.

Shubham Inc Waste Water Treatment

Key Components :

  • Sewage / Effluent collection tank: Where preliminary, effluent is collected.
  • Screening: Any solid materials like; iron particles, stones, plastic items, grass weed, polythene paper, cloth etc are checked through bar screen filter to avoid any damages of the transferring pump.
  • Screening: Any solid materials like; iron particles, stones, plastic items, grass weed, polythene paper, cloth etc are checked through bar screen filter to avoid any damages of the transferring pump.
  • Equalization tank: In which, suspended materials are mixed properly to make a homogeneous mixture. An steering arrangement is employed in the tank.
  • Neutralization tank: Some chemicals are added for maintaining Ph, and for quick flocculation.
  • Sludge tank: After neutralization and flocculation of effluent, the suspended matter undergoes settling which is called sludge. The tank is used for sludge collection.
  • Aeration tank: A mechanical aeration system is adopted in the tank for growth of biomass which are easily coagulates suspended and dissolved particle.
  • Bio reactor: Where biomass is developed in aerobic condition.
  • Lamella filtration: After aeration of effluent, it allows to further settling with certain contact time.
  • Gradually all solids matter deposits at the bottom while the liquid water passed to PSF
  • Pressure sand filter (PSF): Used to remove suspended impurities from the water.
  • Activated carbon filter (ACF): De-odorize any smell in the water.
  • UV/chlorination disinfection: After de-odorizing of water, it is disinfected by either UV (ultraviolet radiation) or with chlorine. So that all types of micro-organisms, pathogens are killed before going to further use.
  • Final water discharge: The discharged water is used for various purpose like, gardening, cleaning, irrigation, car washing

What is waste Water Treatment & Its purpose?

Wastewater Treatment Purpose: To manage water discharged from homes, businesses, and industries to reduce the threat of water pollution. Wastewater Treatment

  • Pre-treatment

Occurs in business or industry prior to discharge
Prevention of toxic chemicals or excess nutrients being discharged in wastewater

  • Preliminary Treatment

removes large objects and non-degradable materials

protects pumps and equipment from damage

bar screen and grit chamber

  • Bar Screen

catches large objects that have gotten into sewer system such as bricks, bottles, pieces of wood, etc.

  • Grit Chamber

removes rocks, gravel, broken glass, etc.

  • Mesh Screen

removes diapers, combs, towels, plastic bags, syringes, etc.

  • Measurement and sampling at the inlet structure

a flow meter continuously records the volume of water entering the treatment plant

water samples are taken for determination of suspended solids and B.O.D

  • Suspended Solids

the quantity of solid materials floating in the water column

  • B.O.D. = Biochemical Oxygen Demand

a measure of the amount of oxygen required to aerobically decompose organic matter in the water

Measurements of Suspended Solids and B.O.D. indicate the effectiveness of treatment processes

Both Suspended Solids and B.O.D. decrease as water moves through the wastewater treatment processes

  • Primary Treatment

a physical process

wastewater flow is slowed down and suspended solids settle to the bottom by gravity

the material that settles is called sludge or biosolids

  • Sludge from the primary sedimentation tanks is pumped to the sludge thickener.

more settling occurs to concentrate the sludge prior to disposal

Primary treatment reduces the suspended solids and the B.O.D. of the wastewater.

From the primary treatment tanks water is pumped to the trickling filter for secondary treatment.

Secondary treatment will further reduce the suspended solids and B.O.D. of the wastewater

  • Secondary Treatment

Secondary treatment is a biological process

Utilizes bacteria and algae to metabolize organic matter in the wastewater

In Cape Girardeau secondary treatment occurs on the trickling filter

the trickling filter does not “filter” the water

water runs over a plastic media and organisms clinging to the media remove organic matter from the water

From secondary treatment on the trickling filter water flows to the final clarifiers for further removal of sludge.

The final clarifiers are another set of primary sedimentation tanks.

What is sewage water treatment?

Sewage treatment is the process of removing contaminants from wastewater, primarily from household sewage. It includes physical, chemical, and biological processes to remove these contaminants and produce environmentally safe treated wastewater (or treated effluent).

What is the purpose of tertiary wastewater treatment?

Tertiary treatment is the next wastewater treatment process after secondary treatment. This step removes stubborn contaminants that secondary treatment was not able to clean up. Wastewater effluent becomes even cleaner in this treatment process through the use of stronger and more advanced treatment systems.

 

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