Filters – Carpark Stormwater

carparkRaHa Clean Close Water systems collect, treat and harvest both rain- and storm waters.

Stormwater treatment is becoming more and more interesting for authorities and planners. It is seen as an important measure, as it can be deployed very precisely, and therefore cost effectively.

It is able to filter and bind pollutants like PAH´s, HC´s, heavy metals like Cd, Zn, Cu, Pb as well as phosphate and ammonium.



The pollutants then can be disposed of safely and easily.

This allows stormwaters from high traffic areas (car parks and roads), industrial areas and metal roofs to be cleaned at site level, and then discharged safely to ground or surface water bodies locally.

carpark2The stormwater is treated in two steps: 1. Solids and particulates are settled in the first step

2. Dissolved contaminants are then absorbed in the filter matrix

Water weirs over from the sedimentation chamber and passes down to the filter bag with the filter matrix inside it.
carpark3Both organic and inorganic contaminants are removed by adsorption and precipitation.

The filtered water then flows within the Channel to the collection point where it can either be re-used or discharged to infiltration.

The initial sedimentation step ensures the long working life of the filter bag, and the granular filter material within it.

The filter is designed to promote an even and homogenous flow distribution within it. Separation of the material is near impossible, by proven and certified design. The pad will need be replaced at about 10 years, depending on site conditions.


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