Patent ID: 7404926

Claim:
A system for treating concrete process waste water containing entrained cementitious particles, the system comprising: a pre-filtering means for receiving waste water from an input line and filtering relatively large particulate matter from the waste water, said pre-filtering means having a first output line; at least one polymeric membrane tangential flow filter connected to said output line of the pre-filtering means, and having a pressure vessel adapted for receiving the waste water under pressure, a polymeric membrane filter disposed within the pressure vessel, for filtering relatively small particulate matter from the waste water, and a second output line for discharging filtered waste water; pH adjusting means for adjusting the pH of waste water filtered by the at least one polymeric membrane tangential flow filter, said pH adjusting means connected to said second output line downstream of said pre-filtering means and said polymeric membrane tangential flow filter; said pH adjusting means including: a reservoir containing a quantity of neutralizing agent; a flow meter connected to said second output line for measuring the flow rate of the filtered waste water; a metering pump connected to said reservoir for metering the neutralizing agent from said reservoir into the filtered waste water; an injection valve receiving neutralizing agent from said metering pump, and connected to said second output line downstream of said pre-filtering means and said flow meter, said injection valve injecting the neutralizing agent into the filtered wastewater; a pH probe connected to said second output line downstream of said injection valve for measuring the pH of the filtered waste water; and a controller electrically connected to the flow meter, the metering pump, the injection valve and the pH probe, the controller being programmed to signal the metering pump to maintain the pH of the filtered waste water between predetermined limits; whereby said controller is adapted to be computer monitored via a connection selectively chosen from the group consisting of local and internet connections; mixing means, connected to said second output line, for mixing the neutralizing agent with the filtered waste water; a housing including a base and a frame mounted on the base, said base forming a skid adapted for moving the system using a forklift, whereby said filter, said mixing means, and said pH adjusting means are mounted on said skid and within said frame, said housing being adapted for transportation and protection of the system; a container connected to said second output line for storing the filtered and pH adjusted waste water; wherein the filtered and pH adjusted waste water is reusable; and means for disposing the filtered particulate matter.