Laserfiche WebLink
labTREAT pH Adjustment / pH Neutralization systems by Digital Analysis Corp. Page 3 of 4 <br />Reagent Storage Tanks :Chemicals for treatment are <br />pumped directly from 55 gallon DOT drtuns using our <br />unique suction wands. An alternate to pumping directly <br />from DOT drums is utilization of day tanks which can be <br />automatically refilled from customers bulk chemical <br />delivery system within the plant. Redundant level sensors <br />and redundant fill valves provide protection against <br />overfilling. <br />log : All recirculation, transfer and discharge lines aze <br />icated from solvent welded PVC SCH 80 pipe. <br />eaded fittings are not used unless absolutely necessary. <br />reagent delivery lines are flexible PFA mbe double <br />twined within a clear flexible PVC hose, clamped at <br />~ end to seal leaks. Alternate piping systems are <br />ilable and commonly used. <br />Valves :All ball valves are true union field serviceable <br />valves. All diaphregm valves are flange mounted. <br />Hlastomers are EPDM and Teflon except on concentrated <br />acid lines where dte elastomers are Viton and / or Teflon. <br />Alternate piping systems are available and commonly <br />ctrical :All enclosures are NEMA 4X, where metallic <br />losures are used they are provided with epoxy or <br />/ester fmishes for corrosion resistance. All conduit is <br />aic coated where possible. Low voltage 24VDC is used <br />iughout to minimiu service personnel exposure to high <br />:age. All panels are OSHA LOTO and NFPA 79 <br />[pliant, additionally UL-508 listing is available. <br />Process Description : The pH adjustment system featured here is an "Optimized Hybrid Batch" pH <br />adjustment system. This technology, developed by Digital Analysis Corp., couples the simplicity and <br />efficiency of continuous flow through design with the inherent safety of "Optimized Batch" system design. <br />All continuous flow through designs are plagued by one major weakness and that is the inability to shut <br />down dischazge flow. Since the treatment tank of a continuous flow through system is always full, one <br />gallon of influent flow will displace one gallon of effluent. This occurs regazdless of effluent pH. <br />Therefore, if somebody decides to dump to drain a chemistry that the system can't possibly handle due to <br />the concentration then an effluent contravention will occur. <br />The "Hybrid" Batch design will shut down discharge flow whenever the effluent pH becomes unstable or <br />approaches the effluent limits. The flow then begins to backup into the treatment tanks while an <br />equilibrium is re-established. Typically 5 minutes of reserve volume is provided for. Once an equilibrium <br />is reestablished and the treatment system pH re-stabilizes discharge flow resumes. This system <br />azchitecture is not designed for effluent streams that fluctuate wildly inflow or influent chemistry. Rather <br />these are designed for effluent streams that have relatively constant or slow changing flow and relatively <br />constant or slowly changing chemistry. Streams that are characterized by concentrated dischazges or batch <br />discharges are best treated with one of our "Optimized Batch" pH adjustment systems from our Hp ASE or <br />batclrTREAT family of pH adjustment /neutralization systems. <br />This system uses two "Optimized" Control Loops. The fast is afeed-forward loop that uses incoming pH <br />and flow rate in an intelligent algorithm to provide coarse treatment of the incoming waste water. This <br />stage, although not terribly accurate does neutralize the majority of the alkalinity or acidity of the influent <br />http://www.phadjustment.com/pI-I/labtreat_LT200.htm 11/1 I/04 <br />