Treatment of Wastewater ...

Treatment of Wastewater Coming from Urinals, Basins

Dear Aiden Ogley,

The wastewater coming from Urinals, Wash Basins, Showers and Sinks is considered or termed as "Grey Water", this is called Grey Water as this has low polluting in it as easy to treat or handle as compare to Sewage or Industrial Wastewater.

The EU Sewage Directive concerning urban wastewater treatment stipulates a maximum concentration of 10 – 15 mg N/lit for sensitive areas or a reduction of the nitrogen load by 70 - 80 % (Council of European Communities, 1991a). In the USA, treated sewage contains between 10 -  20 mg N/lit (Metcalf and Eddy INC., 1991). Normal Untreated Domestic Sewage has Nitrates ranging 20 - 80 mg N/lit, this shows  your output water is quite good in that sense.

Anyway, your wastewater coming will not only have Nitrates rather having BOD, COD, TSS etc. If you want a simple Biological System then the following schemes will be workable depending upon flow rate etc.

Option 1: Anaerobic Digestion which will reduce Nitrates, BOD, COD TSS.

Option 2: Scheme a proper treatment

Anoxic Tank ---> Aeration Tank ---> Settling Tank---> Output.

Option 3: If this has no other TSS or impurities, then may be you can employ Nitrate Removal Filters which are equipped with Anionic Resins for Nitrate Removals (in case only Nitrate is the main concern nothing else).

Your question still needs some more clarifications which I think will come after this above recommendations.

Thanks

Mansoor Ahmed