First sludge from TPH to digester at WWTP Echten

In May 2015, the TPH pilot plant at WWTP Echten was put into operation. The first batch of sludge is hydrolyzed with steam and pumped to the digester.

In a thermal pressure hydrolysis (TPH) plant, a pre-treatment of the sludge takes place by the use of steam injection. After this pre-treatment, the sludge is pumped to the sludge digestion plant, also built by HoSt. With the TPH-technology, an increased biogas production, a  reduction of residual sludge, and an improved dewaterability is expected. This results in higher revenues, lower costs, and less waste.