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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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.