Dec 01

Solidification unit is an regular wat to treat material,GN solids control supply relate equipment

Solidification is an appropriate treatment method for highly concentrated, or difficult to treat waste stream which do not respond well to conventional wastewater treatment methods. Transport and off-site treatment of liquid waste can add up to high disposal costs. Solidification provides a cost benefit by converting liquid hazardous waste into solid, often non-hazardous waste material. Solidified material can be transported off-site as a solid waste.

The solidification process requires pre-selected solidification chemistry be added to the waste. The chemistry is mixed into the waste and within minutes the material is converted into a solid by stabilization of all free liquids.

The solidification process operates as a continuous flow treatment. Liquid waste material is pumped to the solidification unit. A chemical feed system introduces the solidification agent into the liquid waste at the required dosage rate. The liquid waste and solidification chemistry are thoroughly mixed. A steady flow of solidified material is deposited into a roll off bin for offsite disposal.

Each waste type/stabilization process combination can be further categorized according to one of several treatment levels based on regulatory regimes/disposal scenarios that are applicable now or might be in the near future. The three categories are:

Treatment Level A: Treatment to present commercial mixed waste disposal facility requirements. Since there is only one such facility presently operating in the Envirocare of Utah – the requirements for disposal at that facility are used in this document. These requirements comply with present RCRA LDRs and with NRC’s Class A LLW minimum requirements.

Treatment Level B: Treatment to typical RCRA requirements (present or future) that might be applied to mixed waste disposal facilities at some time in the future, based on proposed or pending regulations, as well as developments in the RCRA Corrective Action and CERCLA areas. This includes more stringent metals leaching levels, and higher strength specifications.

Treatment Level C: Treatment to NRC requirements or recommendations for low-level radioactive waste solidification waste form stability requirements (Classes B and C LLW) for cement and noncement waste forms. More stringent ANS 16.1 leachability standards may be required at specific site, for example, Westinghouse Savannah River Company.

The reasoning behind this further sort of classification is that all of these processes have been developed with some set of criteria in mind, but not the same set for all processes. For example, the PAT, SP, and PE processes were designed to produce moderate to high strength monoliths that would meet NRC requirements, while most Grout processes produces low to moderate strength waste forms that may be either granular and soil-like to meet the Envirocare Waste Acceptance Criteria (WAC) (Class A LLW), or monolithic to meet NRC Classes B and C LLW cement waste form requirements.

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