XU Jin,XU Jun,LQiu-ying,et al.Perspectives on Hydrothermal Carbonization Technology for Municipal Sludge Treatment and Disposal[J].China Water & Wastewater,2020,36(16):54-59.
水熱碳化技術用于污泥處理處置前景分析
- Title:
- Perspectives on Hydrothermal Carbonization Technology for Municipal Sludge Treatment and Disposal
- Keywords:
- hydrothermal carbonization; municipal sludge treatment and disposal; biomass conversion technology; sludge-based hydrothermal biochar
摘要:- 由于土地利用受阻、填埋空間有限以及二次污染等問題，污泥處理處置主流技術路線在國內面臨困境，所以亟需從科學方法角度分析其可行路徑。根據污泥處置途徑對含水率的要求，建議當污泥水分存在時先去除或轉化有機物；同時從生物質轉化技術角度進行了可行性分析，其中水熱碳化技術具有處理對象無需干燥、易與其他廢棄生物質及技術組合、產物無菌、磷回收率高等優勢。污泥基水熱生物炭有固-固轉化和液相晶核轉化兩條形成途徑，其熱值與煤相當，脫水性能良好、磷富集回收率高、可固定重金屬，其碳骨架作為氮磷緩釋載體可增加土壤肥力，而且與無機肥減量配施兼具農業經濟價值和環境生態效益。污泥水熱碳化處理可實現污泥減量化、穩定化、無害化和資源化，推薦污泥處理處置方案為重力濃縮/機械脫水+水熱碳化，該工藝適用于原位與分散處理，同時建議采用低溫（150~170 ℃）水熱碳化以避免高溫下污泥發生美拉德反應生成溶解性難降解有機物，其液體產物可作為有效碳源補充到低碳源污水廠進水。
Abstract:- Due to hindered agriculture use and limited space for landfill as well as secondary pollution, the mainstream technology route of municipal sludge treatment and disposal is facing difficulties in China. So it is urgent to analyze its feasible path from scientific approaches. According to requirements of moisture content in sludge disposal process, it is suggested to remove or transform organic matter when sludge moisture exists. Meanwhile, the feasibility analysis is carried out from the point of view of biomass conversion technology. Among them, hydrothermal carbonization (HTC) technology has the advantages of treating object without drying, easy to combine with other waste biomass and technology, sterile product and high recovery rate of phosphorus. Sludge-based hydrothermal biochar has two formation pathways, which are solid-solid and liquid phase nucleation transformations. It has the same calorific value as coal, good dehydration performance, high phosphorus enrichment recovery rate, and could fix heavy metals. Its carbon backbone could be used as a slow-release carrier of nitrogen and phosphorus so as to increase soil fertility. Moreover, the biochar with inorganic fertilizer reduction and application has both functions of agricultural economic value and environmental ecological benefits. Sludge HTC treatment could realize sludge reduction, stabilization, harmlessness and resource recovery. As a result, the process of gravity concentration/mechanical dehydration+HTC was taken as the recommended sludge treatment and disposal scheme, which was suitable for in situ and decentralized processing. In addition, low temperature (150-170 ℃) in HTC was suggested to prevent soluble refractory organics generating from Maillard reaction during high temperature, consequently, the liquid product could be used as an effective carbon source to supplement the low-carbon WWTP.
相似文獻/References:
[1]郭恰.IPCC污泥碳排放核算模型中DOC取值的不足與修正[J].中國給水排水,2020,36(16):49.
GUO Qia.Lack and Correction of DOC Value in IPCC Calculation Model of Sludge Carbon Emission[J].China Water & Wastewater,2020,36(16):49.
[2]李爾,曾祥英.武漢市主城區污水廠污泥處理處置現狀及展望[J].中國給水排水,2021,37(18):8.
LI Er,ZENG Xiang-ying.Current Situation and Prospect of Sludge Treatment and Disposal of WWTPs in the Main Urban Area of Wuhan[J].China Water & Wastewater,2021,37(16):8.
[3]宋曉雅.集中式污泥處理中心的建設與思考[J].中國給水排水,2021,37(20):22.
SONG Xiao-ya.Construction and Thinking of Centralized Sludge Treatment Center[J].China Water & Wastewater,2021,37(16):22.
[4]李雪怡,梁遠,方小鋒,等.北京市污泥處理處置現狀總結分析[J].中國給水排水,2021,37(22):38.
LI Xue-yi,LIANG Yuan,FANG Xiao-feng,et al.Summarization and Analysis of Sludge Treatment and Disposal in Beijing[J].China Water & Wastewater,2021,37(16):38.
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