SEWAGE TREATMENT

Holloway Agri-Drain Ltd cover many aspects of sewage treatment for commercial, industrial, agricultural and domestic clients. ​We specialise in a range of services and installations including the following:
  • Sewage Plants 
  • Septic Tanks
  • Soakaways
  • Reed Beds 
  • Leach Fields/ Septic Fields
Please note that we are unable to empty septic or sewage plants, a licensed waste disposal contractor is required to take waste to licensed sewage treatment works.

Sewage Treatment Plants

The Conder HDPE ASP 6 (Activated Sludge Process) is a unit consisting of a conical tank that contains an inner tank aeration chamber. Where the sewage enters (1), the aeration chamber allows air surging up from the draft tube to aerate the sewage (2), allowing for aerobic bacterial colony's to establish themselves as they digest the organic matter (3).

​As more raw sewage enters the chamber (1), an equal amount of effluent is displaced through the weir (5).

The quiet conditions in the plant allow all the suspended solids to sink to the base of the plant (4), where they are drawn back up the draft tube by displacement from the upward flow of air (2), causing further digestion in the aeration chamber.

The Conder HDPE ASP series are made to constantly recycle the sewage via gravity and the airlift system, achieving near total solids digestion.
​Unlike other sewage treatment plants that require multi stage systems, the Conder does without a primary settlement tank and so can achieve extended intervals of up to 1 to 3 years without the need to empty.
The Conder HDPE ASP 6 - 25pe series has a quiet and odourless operation giving a reliable and low key performance. 
​Installation is a low cost and easy process that allows for a fully below ground installation, minimising visual impact.
The unit has no moving parts which allows for a more reliable performance and lower maintenance requirements.
Optional parts include:
  • Pumped outlet (if gravity feed is to difficult to fit).
  • ASP riser if extra depth is required.
  • ASP alarm for signalling the owner if there is a problem.
  • External air blower for increased aerobic performance.
  • UV treatment for discharge from system.
  • Covers for vents, lockable access hatches and ladders.
  • Grease and oil separators/traps to prevent fats and oils entering the system.

Septic Tanks

A septic tank refers to the anaerobic environment which bacteria can live and grow within the tank. These bacteria (anaerobes) then breakdown the waste from the household into decomposed solids and water. The solids then fall to the bottom as sludge and the waste-water, once treated by the bacteria, flows to a drain type specified by the customer.

A normal function septic system is odour free and should last many years. Minimal to no maintenance is required in its upkeep with visual inspections only being needed once to twice a year.
Septic tanks require to be pumped out every four years to remove irreducible solids, on average for a family of four it's recommended to be checked for this once or twice a year.

Observing the colour of the grass growing around your septic tank can reveal unseen issues with it. If the grass is darker than the surrounding lawn you could have a problem.

Reed Beds

Wetland plants have been used in the UK for decades as bio filters for waste water. These are several designs that can be used, but the most common is the horizontal sub surface flow beds (HSSF).
Provided the pre-treatment systems are working correctly, reed beds are an effective and efficient way of treating domestic waste-water without the need to connect to existing sewage pipes, and requiring no electricity to process the waste-water.
The species of reed that we use is the Common Reed (Phragmites Australis), to populate the beds. This species is hardy and grown in a gravel media.

Soakaways

Soakaway drains and trenches are a simple way of dispersing grey water and surface waters, working as a reverse well.

Their ability to work efficiently is reliant on the soil type, heavy clay soils will need more remedial work than a sandy loam. Areas that are waterlogged will need to be drained first or avoided altogether when selecting a site to build on.
Soakaways are also reliant on the height of the water table and need to be placed above the water table. Areas with a high water table will find that soakaways are not always the best option available.

​Once installed there is little to no maintenance required but it's recommended to check the soakaway for problems 
​every time the septic tank is inspected. Soakaways are often the weak link in sewage treatment systems due to the ease in which they can block up, catchpits are used to remove silt and fines, but its up to the owner to ensure the waste-water leaving the home is fit for processing in the septic tank.

Leach Fields/ Septic Fields

Leach fields are networked perforated pipes laid in underground gravel filled trenches covered by a layer of soil, used to dissipate effluent from septic tanks after digestion by the bacteria. The soil then acts as a filter removing or deactivating pathogenic microbes and fine particulate matter from the water. The soil fauna then begin to break-down any remaining organic matter before allowing the waste-water to percolate away.

By the time the water has reached a surface water supply, it should present no harmful effects and allows groundwater bodies a safe way to recharge reserves.
Care should be used when using detergents, solvents, fats and products that contain dissolved metals or salts.
All of which can clog pipes and kill helpful microbial life.
Holloway Agri-Drain Ltd
47 Winchcombe Road
Sedgeberrow
Worcestershire
WR11 7UZ

Office: 01386 881923     Mobile: 07779247552

Email: [email protected]
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