Loureiro Engineering was contracted for the design and installation of a Closed Loop Wastewater Treatment & Recycling System (WWT&RS). Installation, startup, and training was completed between July and December of 2016.
The WWT&RS was designed and installed to replace four existing 2,500-gallon tanks used for temporary storage of wastewater from etching, developing, and stripping manufacturing processes, prior to shipment off-site as waste.
A treatability study was performed on the effluent wastewaters generated from the etching, developing, and stripping manufacturing processes, to determine the proper treatment methods and technologies. The treatability study was performed at Loureiro’s in-house analytical laboratory, Tunxis Laboratories, LLC.
Based on the results of the treatability study, the treatment technologies selected for the acidic etching wastewaters were equalization, chemical precipitation, microfiltration, and reverse osmosis (RO) filtration. The treatment technologies selected for the basic developing and stripping wastewaters were equalization, particulate filtration, carbon filtration, and vacuum distillation. Ion exchange was selected as a final treatment step, to polish the RO permeate and vacuum distillate water, prior to recycling these waters back to the etching, developing, and stripping manufacturing processes for reuse.
A pilot study was performed at the facility to treat wastewaters generated from the etching, developing, and stripping manufacturing processes. The operating and analytical sample data gathered during the pilot study was used to select the WWT&RS equipment to be installed at the facility for wastewater reuse.
The goals of the WWT&RS Design-Build project were to reduce the volume of wastewater being shipped off-site as waste, and reduce the volume of supply water used in the etching, developing, and stripping manufacturing processes. The dilute wastewaters generated from these manufacturing processes are now recycled back to the processes as supply water, eliminating the need for a wastewater discharge permit. The WWT&RS project has also reduced operating costs associated with shipment of wastewater off-site, and has eliminated the compliance risk associated with a permitted wastewater discharge.