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.
剩余污泥低溫干化熱源首選污水廠出水余溫熱能
- Title:
- Low?temperature Sludge Drying: Priority to Thermal Energy in Effluent
- Keywords:
- excess sludge; moisture content; low-temperature drying; sludge incineration; thermal energy; water source heat pump
摘要:- 污水處理剩余污泥干化焚燒已被確認為污泥處理、處置的終極手段，也是正在實踐中的工程應(yīng)用趨勢。但是，干化熱源選擇對能源消耗特別是與之相應(yīng)的碳排放至關(guān)重要。除非有高溫余熱可以利用，否則，高溫干化不具可持續(xù)性。在此情形下，污泥低溫干化已成為近年來國內(nèi)外普遍關(guān)注的熱點，特別是基于清潔能源的低溫干化技術(shù)。為此，太陽能、微波源、空氣源、地熱源、污水源等低溫干化技術(shù)受到廣泛關(guān)注。相形之下，污水處理廠的出水余溫熱能則是一種易得而又未得到重視的低品位能源�？锼惚砻鳎礋岜媒粨Q4 ℃溫差所產(chǎn)生的熱能（~60 ℃熱水）便是污泥低溫干化所需能量的3倍之多，不僅可以完全滿足干化需求，而且還可助力污水處理廠實現(xiàn)碳中和運行。因此，污水廠出水余溫熱能分散式干化、集中式焚燒電熱轉(zhuǎn)化應(yīng)該成為今后污泥干化焚燒的目標與方向。
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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