The Chinese Government announced the prohibition of discharge of the wash water from open loop scrubbers.
The following paragraphs were selected from the announcement, for your reference:
Discharge of water pollutants from the exhaust gas post-treatment equipment shall be in compliance with relevant specifications. Discharge of the wash-water from open loop exhaust gas cleaning systems into in Inland River and port water of coastal control areas and Bohai Sea is prohibited. Discharge of the residual of wash-water from the exhaust cleaning system or incineration on board is prohibited. Storage and disposal of the residual of wash-water from the exhaust cleaning system on board shall be recorded realistically.
For ships with exhaust gas cleaning system, it is to be checked to verify whether the “Sulfur Oxide Emission Compliance Certificate”, technical manual of the exhaust gas cleaning system, onboard monitoring manual and records of the exhaust gas cleaning system are held. The exhaust gas cleaning system approved according with scheme B is checked to verify whether the continuous exhaust gas monitoring system is installed. The residual of wash water from the ship exhaust gas cleaning system shall be managed as per operational wastes. Records of the ship exhaust gas cleaning system and garbage records are checked to verify whether the residual of wash water from the exhaust gas cleaning system is received by the ship pollutant receiver or discharged to the onshore receipt facility and whether the residual of wash water is discharged into a water area or incineration on board.