Hello Maymoun,  Some good ...

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Hello Maymoun, 

Some good suggestions below but my advice is to call in an independent specialist waste water treatment plant process consultant who is not aligned with any particular product or technology. They need to have access to a good lab so that the failure of the current process is understood and then make recommendations.  A good consultant will provide you with several options and give you some idea of the OPEX/CAPEX cost for each. If you have a budget problem (who doesn't?) then the consultant should also be able to tell you what might be possible with the funding you have available and how it might be possible to stage the works. 

Best wishes,

Harry.