Bissingen, Germany Sludge Dryer Installation
In 2017 the German government put into place new, stricter, ordinances regarding the disposal of sewage sludge. This is to protect the drinking water from increasing contamination from industrialization, intensive farming, and sewage disposal. The new ordinances require municipalities to provide proof of enhanced disposal procedures which will result in higher costs for disposal. For example, the community of Bissingen, Germany, has found a way to recycle their sludge in a safe and cost-effective way, saving them many thousands of Euros per year. They use this new system in cooperation with the local industry of Gropper Dairy.
About 86% of the waste handled by the sewage plant in Bissingen is from Gropper Dairy. The community must dispose of a massive amount of liquid waste per day from the dairy plant and the community sewage waste water without violating the new laws. The solution is to dry the waste water to reduce the volume dramatically and the disposal costs considerably. After installing an STR-8 Jumbo Dryer, their annual savings in disposal costs are about €120,000 to €150,000 ($130,000 to $160,000) and it will pay for itself within the span of 3 to 4 years.
The shared waste water sewage plant operates 24hrs per day and processes nearly 400 million gallons of wastewater per year. The waste water is dewatered by a screw press from 3% dry solids content to at approximately 22% dry solids, and then it is conveyed into the Sludge Dryer. The sludge is dried with 572°F exhaust gas from their CHP and is completely sanitized. The dried sludge is then fed into the Pelletizer and produces a 90% dry pellet. These pellets are very easily stored and are free of dust. The employees no longer need to wear masks to protect themselves. All cost, efficiency, and health concerns are satisfied by the addition of a Jumbo Dryer and Pelletizer.