The effluent quality at the Jardim Conduta Sewage Treatment Plant (STP) – which reached peaks of 99% for the removal of organic loads as the result of an efficient treatment process with state-of-the-art technology – allowed the Foz do Brasil Rio Claro Unit to make increasing investments in sustainability.
The company installed a system to reuse water within the station itself. More than an economic factor, the environmental gain in this investment reinforces the Foz do Brasil principle of seeking sustainable practices and solutions to preserve water resources.
With the installation of the new supply system, which uses treated effluent instead of potable water, it is possible to maintain equipment such as the centrifuge and pumps, which require refrigeration, without wasting treated water. The company’s electromechanical team worked for months to prepare all of the hydraulic installation necessary to supply the station with reuse water. Of the 230,000 liters of water used during a day of operation, at least 44% – which corresponds only to one of the cooling processes – are reuse waters.
The system operates in a simple fashion. The same water that would be returned to the river is first treated and then pumped until reaching a reservoir where there is a sand filter designed to retain small solid particles that may be found in the treated effluent, guaranteeing final water of good quality and allowing for its use in the process equipment, for example.
After the reservoir is supplied and operating normally, the filter will come into play, filtering all of the water that leaves this reservoir and powering the hydraulic system that refrigerates the equipment.
The use of reuse water in the Conduta STP process represents an environmental gain, since the potable water that would be used in the sewage treatment process can then be directed for more noble purposes.