Very Interesting. SO does the presence of Poly not lower your Biogas yield based on what you designed for. We do not want to use potable water. Here in SA we work hard to reuse our treated water produced by the plant, so the municipality avoids using potable as much as possible. The remedy would be to replace chlorine dosing with UV treatment. But I would like to know how the biogas deviates with poly compare to conditions when not using with poly. I am thinking at initial design stage when sizing the Anaerobic digesters you did not take the the Poly affect into account and only found that out afterwards??

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Very Interesting. SO does the presence of Poly not lower your Biogas yield based on what you designed for. We do not want to use potable water. Here in SA we work hard to reuse our treated water produced by the plant, so the municipality avoids using potable as much as possible. The remedy would be to replace chlorine dosing with UV treatment.

But I would like to know how the biogas deviates with poly compare to conditions when not using with poly. I am thinking at initial design stage when sizing the Anaerobic digesters you did not take the the Poly affect into account and only found that out afterwards??

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I've never heard that Polymers used in wastewater treatment can affect the production of biogas. Not in a positive way, neither in a negative way. 

 

What the Dutch water authorities did in recent years is switching from digestion of sludge that was thickened by gravity (1% DS) to digestion of sludge is thickened by rotating belt filters (5 - 7 % DS). In this way they were able to handle much more sludge in their existing digesters or extending the residence time of the sludge in the reactor. In many cases they collected the sludge from different locations via vacuum transport trucks to one central digester. The rotating belt filters were operated unmanned and in most cases the whole wwtp was operated unmanned. 

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