Why Biological Treatment When water is heated, and most waste water has been heated - the naturally dissolved oxygen is driven out. Gas expands faster than water when heated. So it follows that laundry and most bath water is low in oxygen.
Thus it is prone to becoming anaerobic when stored. Wash sink water is not so bad, as ½ the water we use is drawn from the cold tap and has not gone through the electric cylinder, geyser, kettle, or been boiled during food preparation. Remember that water run from the hot tap, when cool, is ‘flat’ and tasteless.
Laundry water, with depleted oxygen and the typically high phosphate content, derived from incompletely expended soaps/detergents of which sodium tripolyphosphate is a principle ingredient, in conjunction with dissolved organic wastes, is an ideal medium for anaerobic bacteria to flourish.
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The BGWS version 1.1 System 1. All water used in our system is gathered via the re-plumbing of the bath, shower, basins, washing machine and preparation sinks.
2. The water used flows with the help of gravity in 50mm PVC pipes from the whole dwelling to a central manifold where all piping is then connected. The manifold allows for easy management of the water going into the filtration system and also provides a siphon node for ventilation of the drainage system.
3. The water passing through the manifold goes onto our filter system which will provide the removal of coarse debris and finer particles such as hair and soap build up. The filter unit is easily accessible so as to allow for maintenance of the filters inside.
4. ‘The Bio-Systems SA Grey Water Additive’ is of utmost importance at this point as it helps in the filtering of the water and in the storage process. Small dosages of the bacteria can also be added to all relevant drains as it will help in the control of odours in the drainage system.
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Materials in the SLP System 1. All materials used are to SABS approved standards.
2. Where possible recycled materials are an option and can be used.
3. All parts are easily accessible to allow for regular checking and maintenance.
4. Our filtration system provides for the removal of coarse debris and finer particles such as hair and soap build up.
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SLP System and the environment 1. The system is designed in such a manner that if not properly managed it will not adversely affect the environment.
2. Systems are constructed, operated and maintained to prevent the likelihood of discharged water causing offensive odours.
3. Where grey water is used in drip irrigation systems (recommended output method), adequate care must be taken to avoid the contamination of underlying aquifers and neighbouring water courses i.e. streams, rivers and dams.
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Health and Safety Requirements
1. All gross faecal contaminated waste from toilets is not be included in the system and will pass directly into sewer mains or septic tanks.
2. Contamination of domestic potable water must be avoided at all costs and may not be discharged directly into or reach any storm water drainage system.
3. Laundry outlet points that are likely to contain large amounts of soiled nappies etc. should not be connected to grey water systems.
4. Outlet points from kitchen sinks, dish washers and waste disposal units should not be included unless the correct grease traps and under-sink particle interceptors are installed. |
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SLP Services and Recommendations 1. We recommend that all installations are carried out by qualified installers i.e. Sustainable Living Projects and/or assigned contractors. The costs of installations are dependent on property size and certain requirements due to varying installation criteria. 2. We provide consultation services for clients and/or other installers.
3. We offer water audits on cost savings achievable.
4. The cost of our system is generally more competitive than other available systems as it provides a higher level of specification, treatment and technical backup. |
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