TECHNOLOGIES

MERICON™ SPENT CAUSTIC TREATING SYSTEM

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MERICON™ technology provides an on-site solution for the processing of spent caustics to reduce their biological oxygen demand (BOD) and chemical oxygen demand (COD), control odor, adjust acidity and destroy phenolics.

Merichem Company's patented technology produces a neutral brine effluent stream that can be routed to waste-water treating facilities, evaporation ponds, or waterways.

MERICON technology was first licensed in 1988. To date, Merichem has granted 30 operating licenses worldwide.

MERICON Benefits

  • Guaranteed final brine effluent quality.
  • Minimal capital investment needed to meet required BOD and COD levels and produce a non-odorous brine effluent.
  • Design of a system based on over 70 combined years of know-how developed in Merichem's own processing plants for sulfidic, cresylic and naphthenic caustics.
  • Minimal contaminants in final brine effluent, which minimizes treatment requirements in WWTP.
  • Specifications for materials of construction and pH control are based on long useful life and minimal maintenance requirements.
  • System design is based on minimal requirements for operator attention.
  • Ability to maintain a 100% on-stream service factor between maintenance turnarounds.
  • Totally enclosed design will prevent odors from acid gases released during the neutralization process.
  • Fully dedicated technical service staff.

The MERICON pre-treatment process enables the handling of spent caustics in an environmentally responsible way that meets regulations with low capital and operating costs when compared to other options. In cases where used caustics cannot be reclaimed, MERICON provides a non-energy intensive and straightforward option to pre-treat the caustic before handling in the wastewater biological treatment units.

Wet Air Oxidation

Discharging toxic and hazardous chemicals into the environment has been a global topic of concern for many years. Many countries have created and are implementing strict laws to protect the public and the environment from these hazardous materials. Wet air oxidation is an established technology that has proven to be effective in the treatment of several classifications of toxic and hazardous wastewaters. The technology is best suited for industrial wastewater streams that are too dilute for incineration and too toxic for biological treatment.

What is Wet Air Oxidation?

Wet air oxidation (WAO) is an aqueous phase process that operates under elevated temperatures and pressure whereby organic and inorganic wastewater streams contaminated with hazardous and/or toxic elements are oxidized by adding air or oxygen to produce carbon dioxide, water and carboxylic acids. When air is used as the oxidant the process is refer to as wet air oxidation.

The process has been successfully used to treat a variety of wastewater streams generated from several manufacturing and industrial processes including wastewater from refinery, petroleum, petrochemical, pulp and paper, automotive, pharmaceutical, chemical, brewing and distilling plants. Oxidation has also been used for the past several decades for the treatment of bio-solids generated from municipal wastewater treatment plants.

When is WAO suitable?

  • Treatment of aqueous streams containing organic material with hazardous elements
  • Substantial reduction of wastewater Chemical Oxygen Demand (COD)
  • Wastewater streams too toxic for biological treatment
  • Pre-treatment of highly contaminated wastewater to produce a biodegradable stream
  • Detoxification and/or pathogen kill of organic sludges
  • Treatment of industrial liquor to economically recover metals


What is unique about the Merichem process?

The primary design variables that affect oxidation performance are reactor temperature, reactor pressure (a function of temperature), hydraulic retention and oxygen partial pressure. Oxidation performance is most sensitive to process temperature, with an increase in process temperature oxygen solubility increases and oxidation performance improves. The Merichem process utilizes solution mixing to enhance oxygen solubility, mixing within the reactor system generates superior oxidation performance at less severe operating conditions. As a result, capital, operation and maintenance costs savings can be realized. Typically the Merichem operating conditions range between 200°C to 260°C and 35 kg/cm2 to 75 kg/cm2.