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?zé)崮?/span>
- 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(rèn)為污泥處理、處置的終極手段，也是正在實(shí)踐中的工程應(yīng)用趨勢(shì)。但是，干化熱源選擇對(duì)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(lái)國(guó)內(nèi)外普遍關(guān)注的熱點(diǎn)，特別是基于清潔能源的低溫干化技術(shù)。為此，太陽(yáng)能、微波源、空氣源、地?zé)嵩�、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?zé)崮軇t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(shí)現(xiàn)碳中和運(yùn)行。因此，污水廠出水余溫?zé)崮芊稚⑹礁苫�、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(biāo)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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