It looks a really interesting ...

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It looks a really interesting project. Are they just showers or are toilets involved?  It may be advantageous to put some form of separation prior to the wetlands to remove some of the carbon.  If it is just showers, then wetlands would be suitable and relatively low maintenance and would clean up the water.  The carbon particles would become incorporated into the soil.

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Hi Don, yes its very interesting! 

The current situation is as follows: 200 employees working in shifts, 7 mobile long drop toilets, 10 showers with grey water draining to a 5m3 Clarus Fusion activated sludge package plant (PP),1 kitchen/butchery where blood and fat is trapped and then drained to PP 

As the PP only receives grey water, there is insufficient COD for microbial growth and digestion. Futhermore, as the staff work in a charcoal factory, their bodies are covered in charcoal dust which makes its way into the plant via the shower water. 

Thus I decided to change the system to the following:

Install 8 low flush toilets (Eaziflush from Envirosan with 2l per flush), Urine, Faeces and kitchen drains to existing PP for AS treatment, effluent used on tree orchard at the factory, Showers drain to new constructed wetland or alternative treatment (capacity = 5m3 per day, BOD 269 mg/l). 

 

So to answer your question, yes it is just grey water- and a constructed wetland should provide adequate treatment. 

 

Regards

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