Please check this link for a ...

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Please check this link for a Technology of River Water Treatment, on the supposition that the issue is one of pathogen contamination:  https://drive.google.com/file/d/0B3E-qEW1tsGmM2pXcmlLMVFoNXJacktzYm9qbDhMdmpSX0Y4/view?usp=sharing

Please note that this approach to treatment is simply by gravity on the presumption that the plant to which you refer would require electricity and chemicals.