Multi Media System

Multi-Media Grey Water Systems

The Aquaco Multi-Media Grey Water System is an incredibly high flow, fully packaged, and small footprint, grey water recycling solution. It is an incredibly energy efficient filtration system for larger projects.

It is primarily targeted at the Middle Eastern market, where the traditional treatment method is sand filtration, and where there is requirement for treating the water rapidly due to the higher ambient temperatures. Our Multi-Media system offers some massive benefits over sand filtration. Aquaco have many systems installed throughout this part of the world, including, Egypt, Jordan and Kuwait.

How does it work?

The high level philosophy of the system works in a similar way to a traditional sand filter. However, Aquaco use a 4 layer multi-media instead of sand in order to increase filter efficiency, prolong the time between backwash cycles, and reduce the cost of filtration in kW/1,000 litres of treated water. Details of our process are below, specific process item details can be found in the downloads section:

  • Incoming grey water from showers, wash hand basins and baths passes through the Aquaco pre-filter, which removes any excess hair and large particulates from the grey water stack. The filter comes with built in spray bars and is supplied with a timed backwash system to be attached to the boosted treated water. The filtered outlet of the pre-filter connects to the pre-treatment tank.
  • The pre-treatment tank is used as a buffer to store the incoming grey water before it is filtered. The tank is aerated and equipped with perforated EDPM aeration tubes and provide a highly oxygenated environment to promote the aerobic biological growth of bacteria. The bacteria digests suspended solids, and helps to reduce the loading on the filters. The process of aeration prevents the bacteria from respiring anaerobically, stopping any risk of fouls smells and stagnation.
  • The water leaves the pre-treatment tank and enters into multi-media filtration skid. It is drawn off using the filter feed pump, which is part of the packaged unit. The water is dosed with Sodium Hypochlorite to disinfect the water and prevent a bacterial film from building up in the filter vessel. The water then passes through the filter bed and is pumped to the post-treatment tank.
  • Prior to entering the post-treatment tank, Aquaco offer an optional activated carbon filter which removes any latent turbidity cause by dyes etc. the activated carbon is also very good at removing any excess chemicals should the water be used for any sensitive purposes i.e. irrigation.
  • The post-treatment tank is where the water is stored prior to being utilized at the point-of-use by either an Aquaco Master Control Unit packaged booster pump set, or a traditional booster set. Aquaco use All the major booster set suppliers for traditional booster use and can provide a set to suit the clients preferred supplier; Grundfos, Armstrong, KSB, Lowara etc.
  • The filtration is controlled by the Aquaco multi-media control panel. The panel is a full PLC panel, and supports MODBUS. All set points, controls, filtration rates, and volt free contacts are manageable and editable from this single point of control. The panel is also responsible for the  backwash cycle and the control of any high-level diversion valves.

Benefits

  • More cost-effective with smaller footprint than most membrane filtration or sand filter systems.
  • Minimal use of chemicals.
  • Naturally mined media.
  • Low volume of water for backwash.
  • Low whole of life cost.
  • Simple annual maintenance.
  • Generally filters suspended solids to 0.5 micron depending on influent.
  • Fully automated backwash
  • Integral self cleaning backwash system
  • Deals with contaminate concentrations of up to 500 mg/litre – filtering to less than 0.5 NTU (officially classified as “ultra-clear”)

 

Typical system schematic: