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Package treatment plant

Package treatment plant

Package treatment plantDefinition of a Sewage Treatment plant

A sewage treatment plant is intended primarily for individual homes and business (package treatment plant) which are not connected to a mains sewer. It works on the same principle as the collective purification plants, but in miniaturized version for individual use. The owners of sewage treatment plant must follow the Small Sewage discharges in England: General Binding Rules as issued by the Department of the Environment, Food and Rural Affairs. There are different rules for sewage treatment plants in Northern Ireland, Scotland and Wale.

The diverse types of sewage treatment plants

The Sewage treatment plants are divided into 2 large families

  1. With free bacterial culture.
  2. With a culture fixed on a support.
  • free cultures: Two technologies are available. On the one hand the “classic” activated sludge sewage treatment plant, and on the other, a more technically developed version, the SBR:
    • Activated sludge: the most common solution in package treatment. This technology is generally based on a tank with two compartments only:
  1. one for aeration and treatment.
  2. the other for settling and clarification.

It is the least efficient of the solutions compared to the two other technologies presented below, because it generates more sludge and does not support the variations of loads.

  • SBR (Sequencing Batch Reactor): sludge is suspended in the sewage treatment plant, usually in a single tank. The effluents will be treated thanks to a complex electronic system which activates the distinct phases of treatment intermittently to allow the oxygenation of the effluents:
  1. the decantation.
  2. the clarification.
  3. the evacuation
  • fixed bed: the design of sewage treatment plants with fixed bed does not normally include any electronics. A compressor sends air into the treatment compartment, which a diffuser transforms into micro-bubbles to oxygenate the effluents. Bacteria that attach and grow on the bacterial bed use this oxygen to degrade the pollution contained in the effluents.

How a Tricel Novo plant is working?

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Package treatment plant

The operation of a waste water treatment, more commonly known as sewage treatment plant, is based on a biological process. Micro-organisms, naturally present in the wastewater of the house, will feed on the organic pollution they contain and thus degrade it by developing. To do this, some of these bacteria need oxygen. The wastewater treatment process is broken down into several stages. There are three:

  1. The primary settling: during this phase, the sludge and the heaviest solids are deposited at the bottom of the pond. The effluents are thus rid of most of their pollution before proceeding to the 2nd phase of the treatment. This step is not always taken up in free crop operation, and it is altered for SBR stations that combine the 1st and 2nd stages into one.
  2. Aeration: this phase makes it possible to feed the bacteria with oxygen. The means employed vary from one type of sewage treatment plant to another. As a rule, airing is done by means of the air supply of a compressor accompanied by a diffuser. The bacteria thus have the oxygen molecules necessary for the biological degradation of the pollution.
  3. Final settling and clarification: during this stage, residual sludge, denser than water, will settle at the bottom of the tank. This allows a final separation between water and residual pollution. The water thus treated is then in compliance with the standards of rejection in force and can be evacuated from the tank to the natural environment.

All sewage treatment solutions manufactured by Tricel are tested and certified for structural strength, water tightness, durability and treatment efficiency, adhering to European Standard EN12566- 3.

Advantages and disadvantages of a Tricel Novo plant

Like any equipment, package treatment plant systems have advantages and disadvantages. They could be summarized as follows for the sewage treatment plant:

Advantages:

  • compact: about 5 m² of floor space (for 5 or 6 population equivalents)
  • light weight: (200 to 300 kg): easy and inexpensive installation (sewage treatment plant with concrete tank weigh more than 2 tons).
  • efficient: effective treatment, no risk of clogging.
  • adaptable: suitable for all types of terrain (difficult ground, presence of groundwater).
  • Reliable: long life (20 to 40 years, whereas the spreading of a traditional die must be replaced every 10 to 20 years).

Disadvantages:

  • not suitable for secondary homes.
  • electricity consumption (cost: around 45£per year).
  • relatively restrictive annual maintenance for some brands of sewage treatment plant.

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