Solids Removal and Management

Imagine you have a waste stream that is “too thin to plow; too thick to drink.” ProAct Services has the solids management equipment and expertise to remove the solids from the water, so your discharge will meet regulatory requirements. Let’s follow this waste stream through an imaginary ProAct system.

Solids Management Process

The first step in this example is dewatering. ProAct’s dewatering boxes are built at its Michigan plant to exact specification to hold a GeoTube®, which is a geotextile that will hold the bulk of the solids and allow water to flow through. The GeoTube® with the solids is handled separately. ProAct can arrange for testing. ProAct can arrange for disposal of non-hazardous wastes.

The water that continues through treatment would then enter one of ProAct’s SRS (sediment or solids removal system) trailers. There are 300 gpm and 500 gpm SRS trailers. Both are built in insulated temperature-controlled trailers, and both are automated. The 500 gpm SRS is described below.

A transfer pump draws water contaminated with suspended particles into the treatment trailer. Once inside the treatment system, the influent water pH and turbidity are measured and these measurements are transmitted to the Program Logic Controller (PLC). The system can be set so that if suspended particles and pH are acceptable, the water bypasses the treatment, and the effluent water discharges out of the treatment trailer.

If turbidity is too high, a metering pump injects polymer chemicals into the process stream. If pH is unacceptable, a different metering pump injects pH-adjusting chemicals. After the chemicals are injected, the water flows into a polytank for storage and mixing.

A transfer pump draws the water-chemical mixture from the polytank and additional polymers are injected. The pump forces the water out of the treatment trailer and into a GeoTube® water box. The polymers are selected to cause the suspended solids in the water to clump together, or “floc.” The GeoTubes® retain the large flocked solids.

A transfer pump draws the water-chemical mixture into the treatment trailer. Another turbidity measurement is transmitted to the PLC. The contaminated water then flows through a 3-pod sand filter, and then through a multi-stage bag filter to remove solids.

After the water passes through the bag filter, a final pH and turbidity measurement is transmitted to the PLC. If the pH and turbidity are unacceptable, the water diverts back to the treatment trailer influent for re-treatment. Water with acceptable pH and turbidity levels are discharged as trailer effluent. Some of the acceptable treated water is routed back a clean water tote for backwashing the sand filters.

Automated operation includes in-line metering to monitor the influent process water for turbidity and pH. The control measures are automatically metered to adjust the dosing for pH control and up to two polymer feed systems for superior floc of suspended solids. The automated features also allow control of the system from your office, home and even from your smart mobile device. Automated communication with the system provides status and alarm notifications to operators around the clock.

The SRS systems can be used as a final treatment step or can be coupled with ProAct’s additional treatment technologies to remove additional constituents of concern. Whatever the desired total volumes or flow rates, ProAct Services has the solution to tackle the wastewater treatment for your project. Contact a ProAct Services Water Treatment Specialist for more information and to discuss your project!