Aquatech International Corp. recently received an order from AES for their 800 MW Coal Fired Power Plant in the Commonwealth of Puerto Rico. This AES power plant operates on treated sewage as feedwater and thus faces a combination of makeup water treatment and discharge challenges.
Prior to obtaining the order, Aquatech worked diligently with the project site to pilot test equipment to arrive at the most optimum solution to solve the challenges faced by the customer. This order includes an Ultrafiltration Unit as pretreatment for an existing Demineralization Reverse Osmosis unit and Brine Concentrator followed by a Forced Circulation Crystallizer for a Zero Liquid Discharge (ZLD) System to evaporate the Demineralization Reverse Osmosis reject plus cooling tower blowdown.
Aquatech’s Ultrafiltration system will use Hollow Fiber membranes configured in two trains of 300 gpm each. The Ultrafiltration system will treat cooling tower blowdown that utilizes treated sewage water for makeup to improve the quality of the feedwater to the demineralization reverse osmosis unit.
The Brine Concentrator and Crystallizer system will utilize seeded slurry technology and will be capable of continuous operation, 24 hours per day, producing distillate for reuse in the process. As specified, the system is configured as 1 x 100% Brine Concentrators and 1 x 100% Crystallizer, processing 100 gpm of wastewater stream. The Crystallizer unit, specially designed to handle organic laden waste stream, will be fully integrated with the Brine Concentrator to produce semi-solid sludge to be disposed off site.
“This latest win further reaffirms customer confidence in Aquatech’s Zero Liquid Discharge process equipment in general and especially in treating wastewaters emanating from power plants operating on treated sewage as feedwater,” said Devesh Mittal, Aquatech’s sales director of North America. “The customer definitely benefited from our integrated process capability of being able to review the entire water and wastewater treatment process at the power plant from start to finish.”