摘要
污水处理碳中和运行已成为未来污水处理的核心内容,这就使得剩余污泥将成为潜在的能源载体物质,需要以增量方式去获得,从而彻底改变污泥是污水处理过程中的一种"负担"、需以减量方式使之消灭的现行观念。的确,具有足够的剩余污泥量方能保证其在厌氧消化过程中转化为碳中和运行的自给自足所需能量。为此,欧美等国家通过COD内源截留与外源挖潜方式最大限度地去实现"污泥增量"。在内源截留方面,可对进水COD实施前端浓缩或筛分,但仅限于高负荷COD进水情况。针对我国市政污水COD普遍偏低的情况,前端浓缩或筛分COD似乎并不适用,应寻求与厨余垃圾等市政有机固体废弃物共消化方能实现"污泥"增量的目的。其实,污水处理碳中和运行的关键并不存在技术障碍,主要受限于政府的宏观环境政策。只要政府高瞻远瞩,予以政策支持、甚至是财政补贴,才能真正与国际接轨,触动污水处理行业朝着碳中和方向迈进,从而获得被普遍看好的综合环境效益。
Carbon-neutral operation has become one of the cores for future wastewater treatment, which will make excess sludge become a potential energy carrier towards increasing sludge production. This fashion will definitely change the current concept that excess sludge is a burden of wastewater treat- ment and should be reduced to a large extent. Indeed, enough sludge production is a prerequisite that producing methane in anaerobic digestion meets the need of carbon-neutral operation. For this reason, European and American countries have tried to increase sludge production by trapping influent COD and/ or adding external organic solid wastes. Trapping COD is clearly limited to those cases with high influent organic loads, which does not suit the China＇ s condition the circumstance, wastewater treatment in China should with extensively low influent COD loads. Under search for municipal organic solid wastes like kitchen waste towards co-digestion with excess sludge. Actually, there are no any obstacles of carbon- neutral operation in technology, and the key obstacle lies in governmental environmental policies. As long as governments are visionary and policies support and even subsidy are followed, China＇ s wastewater could act on international convention, and carbon-neutral operation would be promoted. In this way, a highly foreseen comprehensive environmental benefit would be realized.
出处
《中国给水排水》
CAS
CSCD
北大核心
2016年第12期1-6,共6页
China Water & Wastewater
基金
国家自然科学基金资助项目(51578036)
北京市财政专项"科研基地建设--节能减排协同创新中心"(2016)
关键词
污水处理
碳中和
剩余污泥
厌氧消化
污泥增量
共消化
wastewater treatment
carbon neutrality
excess sludge
anaerobic digestion
sludge increment
co-digestion
