Scrubber wash water testing

Scrubber water wash testing is a vital procedure conducted to assess the efficiency and effectiveness of exhaust gas cleaning systems, commonly known as scrubbers, installed on ships. During maritime operations, scrubbers are utilized to reduce harmful air pollutants, such as sulfur oxides (SOx), by washing exhaust gases with water or alkaline solutions. The wash water generated during this process contains pollutants captured from the exhaust gases and must be treated to comply with environmental regulations before discharge into the ocean. Scrubber water wash testing involves sampling and analyzing the wash water to ensure compliance with regulatory limits for pollutants such as heavy metals, polycyclic aromatic hydrocarbons (PAHs), and pH levels.

As per VGP, Vessel owner/operators must collect and analyze two samples in the first year of permit coverage or system operation, whichever is first, for each of the constituents analyzed in Part to demonstrate treatment equipment maintenance, probe accuracy, and compliance with this permit.
Samples must not be collected within 14 days of each other.
Samples must be collected for inlet water (for background), water after the scrubber (but before any treatment system), and discharge water. For all vessels, one of those samples may be conducted as part a vessel’s annual or other survey, and during the first year, one of those sampling events may be conducted as part of the installation of the system to ensure it is functioning properly.
After the first year, samples must be collected at least once per calendar year for inlet water (for background), water after the scrubber (but before any treatment system), and discharge water, and may be collected as part of the vessel’s annual survey as appropriate. Records of the sampling and testing results must be retained onboard for a period of 3 years in the vessel’s recordkeeping documentation consistent with Part 4.2.

Scrubber wash Water Testing

Ocean World FZE Scrubber Wash Water Testing Services

By monitoring and verifying the performance of scrubber systems through rigorous testing, ship operators can demonstrate compliance with emissions regulations and minimize environmental impacts associated with marine exhaust emissions.

Appendix 3 of RESOLUTION MEPC.259(68) (adopted on 15 May 2015) states regarding Scrubber Wash Water Collection

  1. The wash water discharge criteria are intended to act as initial guidance for implementing EGC system designs. The criteria should be revised in the future as more data becomes available on the contents of the discharge and its effects, taking into account any advice given by GESAMP.
  2. Administrations should therefore provide for collection of relevant data. To this end, shipowners in conjunction with the EGC manufacturer are requested to sample and analyse samples of:
    • inlet water (for background);
    • water after the scrubber (but before any treatment system); and
    • discharge water.
  3. This sampling could be made during approval testing or shortly after commissioning and at about twelve-month intervals for a period of two years of operation (minimum of three samples). Sampling guidance and analysis should be undertaken by laboratories using EPA or ISO test procedures for the following parameters:
    • pH
    • PAH and oil (detailed GC-MS analysis)
    • Nitrate
    • Nitrite
    • Cd ,Cu,Ni ,Pb ,Zn ,As ,Cr ,V
  4. The extent of laboratory testing may be varied or enhanced in the light of developing knowledge.
  5. When submitting sample data to the Administration, information should also be included on wash water discharge flow rates, dilution of discharge, if applicable, and engine power should be included as well as specifications of the fuel used from the bunker delivery note as a minimum.
  6. It is recommended that the ship that has provided this information to the satisfaction of the Administration should be granted a waiver for compliance of the existing installation(s) to possible future stricter wash water discharge standards. The Administration should forward information submitted on this issue to the Organization for dissemination by the appropriate mechanisms.

In Ocean World FZE, we perform the required analytical monitoring for Scrubber Washwater.

  • Sampling Kits packed with all the necessary materials for sampling
  • Transportation of the kits towards the vessels
  • Step – by – Step Sampling Instructions
  • Transportation of the samples to the lab in the required time frames
  • Analysis as per EPA designated methods
  • Reporting as per EPA requirement

Analytes for Exhaust Gas Scrubber Washwater

Analytical Group Specific Compounds
Dissolved Metals
Arsenic Cadmium Chromium Copper Lead
Nickel Selenium Thallium Vanadium Zinc
Total Metals
Arsenic Cadmium Chromium Copper Lead
Nickel Selenium Thallium Vanadium Zinc
Polycyclic Aromatic Hydrocarbons (PAHs)
Acenaphthylene Acenaphthene Anthracene Benz[a]anthracene Benzo[ghi]perylene Benzo[a]pyrene Benzo[b]fluoranthene Benzo[k]fluoranthene
Chrysene Dibenz[a,h]anthracene Fluoranthene Fluorene Indeno[1,2,3-cd]pyrene Naphthalene Phenanthrene Pyrene

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