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Logo, Enpro Solutions, Inc., Process Engineering in Dublin, CA

6500 Dublin Boulevard, Suite 215,
Dublin, CA 94568-3152
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Process Engineering Case Studies

Denali, Multi-Chem Group, LLC – Air Emissions Modeling and Acrolein Scrubber Design

Acrolein is a toxic chemical used as an additive in oil field chemicals. As a sub-consultant to the Denali Group for an acrolein storage and packaging facility in Texas, Mr. Qadir designed a scrubber to control toxic vapor-phase emissions of acrolein.  He performed mass transfer modeling and process calculations to design the scrubber system using liquid phase, sodium bisulphite absorption.  The sources of these emissions were acrolein vapors generated during storage container purging and filling operations.  The scrubber was designed to meet stringent emission control limits both on a percentage removal basis and an allowable discharge concentration basis.


Denali, Grimes, California – Feasibility Study for High TDS Water Effluent Disposal

We conducted a feasibility study and engineering analysis to evaluate the disposal options for effluent from treatment of hard ground water as a boiler water feed. Mass balances were conducted to evaluate the volume and TDS content of waste water streams from a cooling tower, boiler, ion-exchange and reverse osmosis systems. The calculated TDS was compared to the State of California drinking water maximum contaminant level (MCL) to evaluate the feasibility of discharge to unlined ponds versus lined evaporation ponds for wastewater disposal. Cost estimates were prepared for the construction and operation of lined evaporation ponds.


Compliance and Closure, Inc. – Ground Water Remediation System Design

We performed process design to complete and re-commission a former ground water remediation system at an auto workshop site. Our design integrated new process equipment with existing granular activated carbon vessels and piping to form a fully functional remediation system capable of extracting and treating ground water and free petroleum product from onsite wells. Equipment sized and selected included a reciprocating compressor, pneumatic submersible well pumps, a settling/equalization tank, an oil/water separator and system process controls. We prepared a design package including a piping and instrumentation diagram (P&ID), equipment specifications and catalog cut sheets. We also certified the proposed treatment system as adequate to meet the requirements of the national pollutant discharge elimination system (NPDES) General Permit (VOC and Fuels).


Hexane Oil Seed Extraction Process Troubleshooting

Conducted an evaluation of unusually high hexane consumption in the oil seed extraction process at the plant. Observed process, reviewed PFDs, interviewed plant operators, collected plant logs and process measurements.  Examined the logs for trends that could indicate whether process variables such as miscella/solvent flow rate, steam flow/temperature, scrubber flow or operator error might account for the increased hexane losses.  Identified the routes through which hexane losses could occur: through vents and equipment leaks; or as residual in wastewater, meal, and product oil. After statistical data analysis and charting key variables identified deviations in four process variables that could explain the increased hexane consumption. Based on findings recommended measures for process improvements.