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MARPOL73/78公约附则Ⅳ—防止船舶生活污水污染规则是公约最初的5个附则中唯一至今仍未生效的附则。环境保护委员会为了搞清其原因所在,于1997年以环保会通函的形式向国际海事组织的各成员国调查没有接受、加入或批准该附则的原因和困难。根据问卷反馈分析,相当多国家不准备接受原附则Ⅳ的主要原因是在提供接收船上生活污水的设施方面存在困难。另外,对附则的适用性、船上的处理和排放标准等存在实施中的具体问题也是重要的影响因素。
MARPOL 73/78 Annex IV - Rules for the Prevention of Domestic Sewage Pollution from Ships is the only annex to the first five Annexes to the Convention which has not yet entered into force. In order to clarify its causes, the MEP investigated with IMO member states in 1997 in the form of a Circular on Environmental Protection the reasons and difficulties of not accepting, acceding to or approving the Annex. According to the questionnaire feedback analysis, the main reason why a considerable number of countries are not prepared to accept former Annex IV is the difficulty in providing facilities for receiving domestic sewage from ships. In addition, the applicability of by-laws, the existence of specific standards on the handling and emission standards on board, etc., are also important influencing factors.