Largest Treatment Capacity to Date, Enabling up to 100% Increase in Treatment Capacity and 80% Reduction in Excess Sludge Volume Mitsubishi Heavy Industries Mechatronics Systems, Ltd. , a group company of Mitsubishi Heavy Industries, Ltd. , has received an order for wastewater treatment facilities employing its proprietary "two-phase activated sludge system," an advanced wastewater treatment technology, for installation at Mitsubishi Chemical Corporation's Yokkaichi Plant in Mie Prefecture.