A mainstay for projects at McWong are in the area of water recycling. McWong has built water recycling projects for the steel, petrochemical and food processing industries in order to minimize utilization of domestic supply water at large factories.

Water recycling of low-quality water demands removal of the organic and inorgainic materials, water softening and disinfection. Since many water recycling projects are installed in large factories after multiple wastewater treament systems, the treatment process is relatively simple. This however can be a challenge since the demand to keep the system capital costs and operating costs low are usually of premium importance.

A typical system will include influent straining and equalization and will sometimes include some oil removal processes. The system will then usually include a lime-softening process to reduce hardness levels making the recycled water more suitable for a variety of uses. Follwing the lime-softening, rapid sand filters are used as a polishing step to reduce suspended solids concentrations. Finally, a disinfectant is added to make the recycled water safe for handling wherever it may be used around the factory.

McWong has successfully designed water recycling systems to reuse water for landscaping purposes, as boiler feed water, as feed water for UF or RO systems, and as water for general washdown purposes. McWong is very attentive to the needs of each client and the ultimate use of the recycled water to ensure that each of the selected treatment steps are necessary.