JI Sha-sha,HUANG Jin.Phosphorus Forms Distribution and Migration in Sludge Incineration Project[J].China Water & Wastewater,2021,37(5):26-30.
污泥焚燒工程中的磷形態(tài)分布與磷遷移研究
- Title:
- Phosphorus Forms Distribution and Migration in Sludge Incineration Project
- Keywords:
- sludge; incineration; form of phosphorus
- 摘要:
- 以竹園污泥焚燒工程為依托，采用SMT方法研究磷在干污泥、爐渣和飛灰中的含量及賦存形態(tài)。結(jié)果表明，焚燒過程使爐渣及飛灰中的總磷（TP）含量比干污泥提高了2~3倍，還使其中的無機磷（IP）含量大幅提升至TP總量的99%以上，在實現(xiàn)磷富集的同時有效提升了磷的生物可利用性。分析焚燒過程對磷灰石無機磷（AP）和非磷灰石無機磷（NAIP）的影響，發(fā)現(xiàn)鎂離子與鈣離子會與污泥中的NAIP發(fā)生反應(yīng)，取代鋁離子從而生成鈣鎂結(jié)合形式的AP；與爐渣相比，飛灰在布袋處受CaO添加的影響，此種轉(zhuǎn)化趨勢更為明顯，AP已經(jīng)超過NAIP成為優(yōu)勢形態(tài)，占IP總量的78.4%。焚燒是上海地區(qū)處理污泥的主要方式，該研究結(jié)果從營養(yǎng)物回收角度為污泥焚燒飛灰的資源化利用提供了新思路。
Abstract:- Based on Zhuyuan sludge incineration project, contents and forms of phosphorus in dry sludge, slag and fly ash were explored by using SMT method. The total phosphorus (TP) contents in slag and fly ash were 2 to 3 times higher than that in dry sludge, and the inorganic phosphorus (IP) contents in slag and fly ash were increased to more than 99% of the total TP. Therefore, the phosphorus bioavailability was effectively improved while phosphorus enrichment was realized. The effects of incineration process on apatite inorganic phosphorus (AP) and non-apatite inorganic phosphorus (NAIP) were analyzed. It was found that magnesium and calcium ions reacted with NAIP in sludge, replacing aluminum ion to form calcium-magnesium binding AP. Compared with slag, this transformation trend in fly ash was more obvious because of CaO addition in bags, and the AP surpassed NAIP to become the dominant form, accounting for 78.4% of the total IP. As incineration is the main way of sludge treatment in Shanghai, the above conclusions provide a new idea for resource utilization of fly ash created in sludge incineration from the perspective of nutrient recovery.
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