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Planning

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Planning

December 5, 2014 Read more

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Planning

December 5, 2014 Read more

Project Details

Client

Awesome Company

Background

Meadwestvaco (MWV) refines crude tall oil received from a variety of Kraft pulp and paper mills to manufacture tall oil rosin, pitch, fatty acids, and light ends. MWV is required to measure the whole effluent toxicity (WET) of its process wastewater outfalls by its LPDES permit conditions. MWV discharges exhibited periodic lethal and sublethal toxicity to the Ceriodaphia dubia. MWV requested that CK identify the cause of effluent toxicity by class; work with an analytical laboratory to identify the toxic compounds by name, if possible; and identify a method to reduce toxicity to acceptable levels based on the LPDES permit conditions.

Findings

CK performed the full spectrum of EPA-recommended, and several custom, toxicity identification evaluation (TIE) tests and was able to demonstrate that the toxicity was associated with colloidal suspended solidsWhile identification of the toxicant(s) was not achieved, toxicity was reduced to the point of compliance through removal of colloidal particles.CK worked with MWV and chemical vendors to identify a coagulant and flocculant that were capable of removing all lethal and sublethal toxicity from the facility effluent at the bench scale.

Resolution

CK is currently assisting MWV in a pilot-scale treatment system to determine if coagulation and flocculation will be an effective treatment technique within the facility’s wastewater treatment system.

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