《深入推进城市黑臭水体治理攻坚战实施方案》的发布，引发了对细节的关注，如：建立完善垃圾回收(打捞)转运体系，不应盲目提高污水处理厂出水标准和新建污水处理设施；到2025年，进水BOD浓度高于100mg/L的城市生活污水处理厂规模占比将达90%以上；加强“农家乐”、种植采摘园等区域内生活及农产品产生污水及垃圾治理；将黑臭水体整治不力问题纳入中央生态环境保护督察和长江经济带、黄河流域生态环境警示片现场调查拍摄范畴；落实污水处理收费政策，并推广以进水污染物浓度、排放量削减量和污泥处置量为依据支付运营服务费用等。以下我们就探讨“进水BOD”这一问题。
什么是BOD
BOD，即生物化学需氧量，是指在一定条件下微生物分解存在于water中的可生化有机物进行的生物化学反应过程中消耗溶解氧数量的一个综合指标，也是重要的water quality pollution parameter。一般清净river flow five-day BOD不超过2mg/L，工业、农业用water等要求五日BOD小于5mg/L，而生活饮用water应小于1mg/L。《城镇pollution discharge standard》明确，five-day BOD一次监测最高允许排放浓度为一级A15mg/L, 一级B30mg/L, 二级45mg/L, 三级70mg/L。
为何进Watered BDO低了不行
从上述定义看,BDO数值高表明有机pollutant含量高，但难道不是进Watered BDO数值越低越好吗？矛盾症结点还是在清purified是否分流。
从BOO看rainfall and sewage separation and pipe network improvement
专家普遍认为，过低的BOO直接原因大部分可以归结到非living sewage into diluted water sources，以及pipe network flow speed too low (large amount of BOO in the pipe network) such factors above thus will have "progressive BOO" focus point.
Rainfall and sewage separation renovation and pipe network construction
Rainfall and sewage separation renovation is a common topic discussed by experts, which involves the process of improving pipe networks. The pipe network has been repeatedly mentioned in recent years due to its widespread problems.
In addition to the issue of price mechanisms, the work of expanding or repairing pipes is indeed a heavy task.
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标签： 地理资讯
