Gary Have you characterized ...

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Gary Have you characterized the wastewater? Do you know what fraction of the COD is particulate, soluble, biodegradable and unbiodegradable? If some of the COD is particulate biodegradable then you could consider primary sedimentation. Patrick's proposal of fine sieves is also not a bad idea. Bu ultimately you would have to know in what form the COD is and how much. Do your perhaps have a process flow diagram of the current installation ? Regards