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Offshore Support Journal

Ballast Water Treatment Technology

Envirocleanse to apply for USCG type-approval

Wed 03 Jan 2018 by Paul Gunton

Envirocleanse to apply for USCG type-approval
Envirocleanse’s inTank distributes its active substance via nozzles into the ballast tanks (credit: Envirocleanse)

Envirocleanse will be applying for US Coast Guard (USCG) type-approval during Q1 this year for its inTank ballast water management system (BWMS). It has completed all land-based and shipboard testing for its system, the company said in a statement yesterday.

Applications for IMO and Flag type-approvals will then be made, “after the appropriately-scheduled MEPC meetings,” the statement added. The next meeting of IMO’s Marine Environment Protection Committee (MEPC) is scheduled for 9-13 April this year.

All the tests have been carried out aboard the training ship Golden Bear, owned by the California State University Maritime Academy, with DNV GL as the independent laboratory.

As its name suggests, InTank treats water in transit using what the company describes as a unique nozzle dispersion system patented by the US Geological Survey for mixing its active substance in the ballast tanks. That substance is sodium hypochlorite (NaOCL), which can either be generated electrically from a small sample of ballast water or carried as a bulk chemical, depending on a ship’s operating profile.

A circulation module mixes one tank at a time, adding disinfectant until the target total residual oxidant (TRO) level is reached. After an initial hold time, the module rechecks the TRO in each tank, applying more NaOCL if required. Before discharge, the module checks the remaining TRO and applies sodium thiosulfate to neutralise any remaining active substance.

Envirocleanse executive vice president of sales and marketing Matt Hughes said in the company’s statement that its system needs no filter, imposes no repower requirements on the vessel and requires no crew interaction in port. “One of the primary concerns of today's ship operators – BWMS operational delays and related demurrage – has effectively been eliminated,” he said.

Its announcement comes two months after the company revealed an agreement with CMB/Bocimar to install an inTank BWMS aboard the Capesize bulk carrier Mineral New York. This is a pilot study and includes treating water in a cargo hold being used in part as a ballast tank. Speaking to BWTT today, Mr Hughes said that the system’s final module will be delivered to the vessel on 22 January and should be up and running soon after.  “We already know the system works due to recent dye trials that replicate our system,” he added.

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