Anovel hydrodynamic cavitation system has been used for the treatment of activated sludge, which will generate extreme conditions of high temperature and high pressure at a microscopic level, and cause microbial cell disruption in the sludge, thereby reducing the moisture content of the sludge by 8-15% in the dehydration stage, achieving substantial sludge reduction up to over 40% when used with biochemical system.
In recent years, low-temperature drying and incineration treatment are necessary to get lower sludge moisture level. Now, with CHC system, operators can get lower moisture level, less sludge volume and more microbial cell disruption in sludge, which means a significant reduction in disposal costs.
CHC system can also be used to treat circulating cooling water. Water from the tower sump is pumped under high pressure into the cavitation chamber, where it is forced to rotate at high velocity through precision nozzles. The opposing water streams collide in the cavitation zone, where millions of high energy, micron-sized bubbles cavitate. The treated water exiting the cavitation chamber is returned to tower sump where the precipitated calcium carbonate is removed by the integral filtration system.
CHC system has been put into operation in a large wastewater treatment plant in Shandong, China, and showed its excellent performance in improving sludge sedimentation, reducing sludge moisture content and providing additional carbon sources for biochemical systems.