《深入打好城市黑臭水体治理攻坚战实施方案》的发布，让不少目光聚焦到了更为细致的地方，如：“建立健全垃圾收集(打捞)转运体系”，“不应盲目提高污水处理厂出水标准、新扩建污水处理... 《深入打好城市黑臭水体治理攻坚战实施方案》的发布，让不少目光聚焦到了更为细致的地方，如：“建立健全垃圾收集(打捞)转运体系”，“不应盲目提高污水处理厂出水标准、新扩建污水处理厂”，“到 2025 年，进水BOD 浓度高于 100 毫克/升的城市生活污水处理厂规模占比达90%以上”，“严格做好‘农家乐’、种植采摘园等范围内的生活及农产品产生pollutant及waste治理”，“black water body整治not well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waste treatment fee政策”，推广以water pollution factory进water pollutant浓度、waste reduction量和sludge handling处置量等支付operating service费”等。本文就这个问题来探讨一下。
What is BOD?
BOD, biochemical oxygen demand, refers to the amount of dissolved oxygen consumed by microorganisms during the biological and chemical reactions that break down organic matter in water. It is a comprehensive indicator of the level of organic pollutants in water and an important parameter for assessing water quality.
Why can't we just reduce BOD?
From this definition, it seems that reducing BOD would be beneficial for improving water quality. However, there are several reasons why simply lowering BOD may not be enough:
a. The main reason for high levels of BOD in wastewater is due to industrial effluent and agricultural runoff.
b. The current wastewater collection system often lacks proper separation between sewage from households and other sources (such as factories), leading to cross-contamination.
c. Inadequate maintenance or upgrading of existing infrastructure results in reduced efficiency at treatment plants.
From a low-level perspective
The focus on "low-level" BOD concentrations highlights concerns about rainwater mixing with sewage (rainfall often dilutes pollutants) and slow-moving pipes where sedimentation occurs more easily within them; these factors contribute significantly to poor-quality discharge into rivers.
4.. Rainwater drainage systems need improvements
Rainfall causes significant stress on urban drainage networks because it overwhelms their capacity when heavy rainfall events occur frequently or simultaneously across different parts of a city’s catchment area while also impacting storm drains directly connected through combined sewer overflows (CSO). These issues result from insufficient investment in green infrastructure such as green roofs & permeable pavements which can help manage surface run-off efficiently without causing harm environmentally speaking either way around!
标签： 基础地理
