HAOXiao-di,SHENZhan,LIJi,et al.Low?temperature Sludge Drying: Priority to Thermal Energy in Effluent[J].China Water & Wastewater,2023,39(6):1-8.
剩余汙泥低溫幹化熱源首選汙水廠出水余溫熱能
- Title:
- Low?temperature Sludge Drying: Priority to Thermal Energy in Effluent
- 關鍵詞:
- 剩余汙泥; 含水率; 低溫幹化; 汙泥焚燒; 余溫熱能; 水源熱泵
- Keywords:
- excess sludge; moisture content; low-temperature drying; sludge incineration; thermal energy; water source heat pump
摘要:- 污水处理剩余汙泥干化焚烧已被确认为污泥处理、处置的终极手段，也是正在实践中的工程应用趋势。但是，干化热源选择对能源消耗特别是与之相应的碳排放至关重要。除非有高温余热可以利用，否则，高温干化不具可持续性。在此情形下，污泥低温干化已成为近年来国内外普遍关注的热点，特别是基于清洁能源的低温干化技术。为此，太阳能、微波源、空气源、地热源、污水源等低温干化技术受到广泛关注。相形之下，污水处理厂的出水余温热能则是一种易得而又未得到重视的低品位能源。匡算表明，水源热泵交换4 ℃温差所产生的热能（~60 ℃热水）便是污泥低温干化所需能量的3倍之多，不仅可以完全满足干化需求，而且还可助力污水处理厂实现碳中和运行。因此，污水厂出水余温热能分散式干化、集中式焚烧电热转化应该成为今后污泥干化焚烧的目标与方向。
Abstract:- Sludge drying and incineration have been identified as an ultimate approach to treating and disposing excess sludge from wastewater treatment, which is also a technical trend in practice. However, choosing heat sources is a decisive factor on energy consumption and associated carbon emissions. Except for economically available high-temperature source, high-temperature sludge drying is unsustainable. Under the circumstance, low-temperature sludge drying has been become a research topic recently, especially with cleaner energy. In fact, renewable heat sources, such as solar energy, microwave energy, air-source heat, geothermal heat, and wastewater source heat, are gaining more and more attentions to. Among them, thermal energy extracted from effluent in wastewater treatment plants (WWTPs) is a kind of low-grade heat, which has been easily available but neglected chronically. The previous calculated results reveal that heat exchanged from effluent with 4 ℃ could offer 3 times higher thermal energy (about 60 ℃ hot water) needed of sludge drying, which could not only meet the need of drying energy but also achieve carbon-neutral operations of WWTPs. Thus, decentralized low-temperature sludge drying with thermal energy and centralized sludge incineration for combined heat and power (CHP) would become a developing goal for sludge treatment and disposal.
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