Case Study: ParaDyne Activation Polymer System Profiles/Woodstock... · Case Study: ParaDyne...
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Transcript of Case Study: ParaDyne Activation Polymer System Profiles/Woodstock... · Case Study: ParaDyne...
Case Study: ParaDyne Activation Polymer System
25% Savings in Polymer Usage at the City of Woodstock, IL Treatment Facility The City of Woodstock, IL Wastewater Treatment Plant, located approximately 50 miles Northwest of Chicago, serves a population of 24,000 people in McHenry County Illinois. The City of Woodstock’s previous polymer system was installed in 1993 and was becoming a maintenance issue. IPM Systems and Energenecs, their local representative, visited the plant to review the solids dewatering system with Plant Superintendent Anne George. The existing polymer system had features which were not required, including an over complex control scheme which could be simplified based on the relatively constant sludge flow rate and solids concentration to the Cities belt filter press. After reviewing proposals from several manufacturers, the City of Woodstock chose IPM Systems of Lee’s Summit, MO to provide their ParaDyne polymer system. The Results are In: The patented ParaDyne polymer system, developed in the early 2000’s by the inventor of the first successful in‐line polymer system, has proven its ability to save plant operators time, maintenance hassles, and most importantly, money. Prior to installing the ParaDyne system, Woodstock’s polymer consumption was approximately 7.8 lbs. of active polymer per ton of dry solids, with a dewatered cake solids content of approximately 12‐13%. The plant’s 2 meter belt filter press runs at approximately 175 gpm at 2% solids concentration. Utilizing 55 gallon polymer feed drums; the City mixes Ashland Chemical Praestol K290 FLX with 44% active polymer content. On initial startup of the ParaDyne system, Woodstock’s polymer feed rate was decreased from 1.9 to 1.4 gph. Initial water flow rate was set at 480 gph resulting in a polymer solution concentration of 0.3% by volume.
After installing the ParaDyne system, Woodstock’s polymer consumption decreased by 25% with dewatered cake solids exceeding 14%. City of Woodstock’s Solids Processing Summary: Aerobically digested sludge with 2% solids content is pumped to a 2 meter belt press at a flow rate of 175 gpm for dewatering. Sludge is dewatered approximately 1 day per week, 7 hours per day Sludge from the belt filter press is stored on sludge drying beds until farm fields are ready for application. Polymer System Installation and Startup: The City of Woodstock installed the Paradyne polymer system themselves utilizing the plants existing utilities and polymer solution piping to the belt press polymer/sludge mixer. After installation, Energenecs service personnel started up the polymer system, training the operators on proper operation and maintenance. Major improvements in the ParaDyne design over existing technologies include;
A non‐impinging rotor that pulls polymer through the mixing zone as opposed to pushing it with an impeller. A VFD is supplied to vary the rotor speed to optimize polymer mixing energy.
No Recirculation: All polymer and water introduced into the mixing chamber passes through the high shear mixing zone without recirculation, eliminating the possibility of partially hydrated polymer molecules re‐circulating through the high shear zone resulting in fracture of the polymer molecules.
The “Stay Clean” check valve spring is located outside of the flow path. This eliminates polymer gumming or clogging around the spring.