SEWAGE TREATMENT PLANT (STP)

LET'S TOGETHER MAKE WATER SUSTAINABLE

SEWAGE TREATMENT PLANT:

Sewage is wastewater coming out from Residential Apartments, Tech Park, Hotels, Restaurant, Institutions, Shopping Centers, Recreational Places and many more which contains Kitchen waste, washing Cloths, faeces, urine, floor wash, Care wash and etc., Sewage treatment is a major problem in developing Countries due to water Scarcity.Sewage before disposed of either to surface water or on Land has to be treated, so as to make it free from pollution which contaminates our ENVIRONMENT and has dangerous impact on HUMAN HEALTH, LIFE and OTHER LIVING BEING. The Degree of treatment required depends upon the characteristics of Sewage and source of disposal.



Sewage can be treated in different ways. Treatment processes are classified as:

  • PRELIMINARY TREATMENT. The processes used are: SCREENING for removal of larger floating particles; GRIT CHAMBERS for removal of grit and sand; OIL AND GREASE TRAP for skimming of oils and greases.
  • PRIMARY TREATMENT. It consists of SETTLING BASINS & MECHANICAL COAGULATION AND FLOCCULATION TANKS for removal of Suspended particles and colloidal Particles.
  • SECONDARY TREATMENT. This is accomplished by biological treatment of effluent coming from the primary treatment tank. It Involves CONVENTIONAL ACTIVATED SLUDGE PROCESS (ASP), MOVING BED BIO REACTOR (MBBR), SEQUENTIAL BIO REACTOR (SBR) & MEMBRANE BIO REACTOR (MBR).
  • THE FINAL OR TERTIARY TREATMENT. This treatment consists in removing taste, odor and organic load left after secondary treatment (killing of pathogenic Bacteria). It consists of PRESSURE SAND FILTER (PSF), DUAL MEDIA FILTER (DMF), and ACTIVATED CARBON FILTER (ACF) and DISINFECTION UNIT. This treatment consists in removing taste, odor and organic load left after secondary treatment (killing of pathogenic Bacteria). It consists of PRESSURE SAND FILTER (PSF), DUAL MEDIA FILTER (DMF), and ACTIVATED CARBON FILTER (ACF) and DISINFECTION UNIT.
CONVENTIONAL ACTIVATED SLUDGE SEWAGE TREATMENT PLANT FLOW DIAGRAM:

Advantages of ASP

  • Good quality effluent
  • Loss of head is small
  • Free from fly and odor nuisance high degree of treatment

Disadvantages of ASP

  • Not very flexible method
  • Sludge disposal is required on large scale
  • Skilled supervision is required to check that the returned sludge remains active
  • More space requirement.
MOVING BED BIO REACTOR SEWAGE TREATMENT PLANT FLOW DIAGRAM:

ADVANTAGES OF MBBR

  • Capital Investment is low
  • Responds to load fluctuations without operator intervention
  • Lower sludge production
  • Less area required
  • Resilient to toxic shock
  • Process performance independent of secondary clarifier
  • No Sludge Handling Problem
  • High effluent quality
  • Operation & Maintenance cost is low
  • Can treat large amount of sewage
  • Cheaper construction
  • Cheaper MOC
  • Maintenance is easy.

DISADVANTGES OF MBBR

  • MBBR media tends to wash out of the systems over time
  • Installation can be made for smaller capacities.
SEQUENTIAL BATCH REACTOR SEWAGE TREATMENT PLANT FLOW DIAGRAM:

ADVANTAGES OF SBR

  • Less land required.
  • High effluent quality.
  • All steps are contained in one tank
  • Resistant against shock-loads and applicable for a large range of organic and hydraulic loading rates.
  • Flexibility in operating conditions allows for optimizing different treatment objectives.

DISADVANTGES OF SBR

  • Highly mechanized equipment (control panel).
  • Effluent and sludge might require further treatment.
  • Expense of providing aeration,
  • Possible requirement for more than one treatment unit to accommodate cleaning schedules, and
  • Requirement for monitoring and operating expertise to manage the reactor
  • Sludge Handling Problem
  • Operations and Maintenance cost is High.

CLIENTS

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