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Grey water treating using plants

Canna banana cattails vetiver phragmitis are some of the quick growing plants which can be used for bio filtering of waste waters. Each of these plants or several based on water to be purified are to be grown in buckets filled with sand. Each bucket has a tap at the bottom to allow the treated water to flow into the next bucket. Feeding of waste water is from top while withdrawal is at the bottom. Each bucket has a perforated tube embedded to allow air to be introduced into the interiors of the bucket. When the waste water enters the first bucket the tap is kept closed so that the roots of the plant are inundated with this waste water. Once the bucket is filled indicated by bubbles seizing coming out of the perforated tube the bottom tap is opened to allow water to flow into the next bucket and continued. The moment the tap is opened the water drains out sucking air in through the perforated tube. Thus the roots of the plant absorb nutrients from the waste water and air too and grow. The waste water too gets oxygenated and cleaned in the process. After a lapse of sufficient time the cleansed water could be passed through an activated charcoal filter and is ready for re-use.

Cannas have been successfully used in a few places in Chennai,India to purify grey water. The water after having passed through a canna bed is used to recharge borewells...

Especially in high rise apartments the grey water can be cleaned by passing through a canna bed and the cleansed water used for their gardening needs easily. For flushing toilets the grey water is to be pumped up to a separate tank and sent to fill the flushes in the toilets through a separate pipeline. No real need to clean up the grey water for it to end up as black water. If the bathing area is kept separate from the toilet the waste water could be stored and pumped to the flush tanks using a small HP motor whenever required.

Canna
 phragmitis 
 vetiver 
 cattails
 Banana

These can be planted around a grey water pond to treat grey water efficiently. 

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