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.