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Aug 2

Who invented STP Sewage Treatment Plants


In the early 1800s, the development of sewers was began in London. In 1843, the primary sewer device, in Hamburg, Germany, was once formally designed by means of a British engineer, Lindley (Anon, 2011). In 17th century Colonial America, household sewage wastewater control consisted of a privy (toilet) with an outlet built at floor degree that discharged outside to a cesspool or a sewer. With low population densities, privies and cesspools built on this method didn't create many problems (Duffy, 1968).

But because the inhabitants increment, the desire and need for an engineered device for sewage wastewater control in large cities changed into extra evident. Scientists and public health officers started to know the relationship between illness outbreaks and contamination of consuming water from wastewater.

Nuisance caused by means of odors, outbreak of diseases, e.g. cholera, and different public health considerations brought about the design of a comprehensive sewer system in Chicago in the 1850s.

At that point, the sewer system was used to transport the untreated sewage wastewater outside of the residential community to a stream of river . Dilution of the wastewater with the stream water was the primary manner of pollutant reduction.

These had been known as water-carriage sewer system.

Public health concern in the 1850s also resulted in the planning and development

of a water-carriage sewer system for the city of London.

A cholera epidemic struck London in 1848 and once more in 1854, causing more than 25,000 deaths (Burian et al., 2000). Dr. John Snow used to be the first doctor at the moment to establish a connection between the cholera outbreak and a contaminated fresh water supply on the Broad Street public well. In addition, he showed statistically that cholera victims had drawn their consuming water from a sewage-contaminated part of the river Thames, whilst those who remained healthy drew water from an uncontaminated a part of the river.

These findings, together with the discoveries by means of Pasteur and Koch, prompted the British Parliament to go an act in 1855 to strengthen London’s waste control machine.

This led to the development of a comprehensive water-carriage sewer gadget for London, designed via Joseph Bazalgette (Hey and Waggy, 1979).

Toward the start of the twentieth century, STP mainly used settling tanks (primary treatment) to take away suspended particles from the wastewater sooner than discharge to streams and rivers. In the early 1900s, about 1,000,000 other folks in the United States were served through 60 such STPs.

In the early 1900s, the primary trickling filter was built in Madison, Wisconsin, to offer organic (secondary) treatment to wastewater. The Imhoff tank was once advanced through German engineer Karl Imhoff in 1906 for solids separation and further remedy.

The first activated sludge procedure was once constructed in San Marcos, Texas, in 1916 (Burian et al., 2000)


New Posts
  • a. Selection of process The selection of specific unit processes depends on the nature of the sewage water , including degradability and treatability by selected processes plus the selection also depends on the discharge requirements . Other important factors for selecting any stp design are environmental impact , land availability , projected life of plant design and cost. All the relevant factors in process selection should be considered , although their relative importance will vary due to social , environmental , political differences as well as technological availability and expertise. b. Design of Biological reactor . The rate at which components of wastewater , such as organic matter are removed and the rate at which biomass is produced within a reactor are important criteria in the design and calculation of the size of biological reactors . c. Environmental Factors Affection growth. A number of environmental factors affect the activity of wastewater microbial populations and the rate of biochemical reaction. The factors include temperature , pH , Dissolved Oxygen , nutrient concentration and inhibition by toxic compounds. It is possible to control all these factors within a biological treatment system , except temperature .
  • After primary treatment the settled sewage water enters a specially designed reactor where it is mixed to a dense microbial population under aerobic conditions. Micro organisms , mainly bacteria convert soluble and colloidal organic matter into new cells . Now all that is required is to separate the dense microbial biomass from the purified wastewater . This is done by clarifier ( tube settler , lamella clarifier , upflow filter ) . The sludge from the clarifier is very different from the primary sludge , being composed mainly of biological cells rather than gross faecal solids . There are many different biological technologies available for sewage treatment including fixed film reactors , activated sludge systems , stabilization ponds eg . SAFF , FAB STP , Moving Bed Bioreactor MBBR based Sewage Treatment Plant , MBR , SBR Membrane Biological Reactor Sewage Treatment Plant
  • 1. To convert the waste materials present in the sewage into stable oxidized end products that can be safely disposed of to inland waters without any adverse ecological effects. 2. To protect public health 3. To ensure wastewater is effectively disposed of on a regular and reliable basis without offence. 4. To recycle and recover the valuable components of the wastewater 5. To provide an economic method of disposal 6. To comply with legal standards and consent conditions placed on dischargers
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