Practical Applications, Inc. (PAI), a leading environmental company, has designed and built a Metal Precipitation System for SPIECAPAG, a subsidiary of ENTREPOSE Contracting. Esso Highlands Limited (a subsidiary of Exxon Mobil Corporation) is the operator of the Papua New Guinea Liquefied Natural Gas Project (PNG LNG) and will use the system to treat wastewater from the PNG LNG Project.
The PAI 1878 pH Adjustment and Metal Precipitation skid-mounted batch reactor is designed to treat alkaline and acid wastewater with heavy metal contaminants. The pH is adjusted in the final sequence to achieve the permissible discharge limits. The portable, skid-mounted system is composed of the following equipment: one conical reactor vessel, one mixer, four chemical suction stations, four metering pumps two pH/temperature sensors, one pH analyzer, one flow meter with flow totalization, two electrically-actuated ball valves, two continuous capacitance level sensors (one operating and one spare), four drum low-level detector indicators, two spill containment pads, and one main control panel. The Metal Precipitation System is completely wired and plumbed for use, with only minor modifications required on-site. Likewise, the chemical metering pumps are cord and plug connected to allow for maintenance and easy set-up.
The PAI 1878 Metal Precipitation System is designed to operate automatically in batch processing mode. The Operator Interface Terminal (OIT) displays the tank pH, effluent pH and flow. The OIT tracks the number of batches the reactor has processed, allows for user modification of set points, and indicates alarm/abnormal conditions. The system is designed to operate automatically with only minimal operator interaction beyond reagent refill and inspections/maintenance.
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Source: Practical Applications, June 2, 2011;