工业水处理 ›› 2024, Vol. 44 ›› Issue (3): 177-183. doi: 10.19965/j.cnki.iwt.2023-0656

• 试验研究 • 上一篇    下一篇

市政污泥热解残渣中磷回收及鸟粪石合成研究

余波1,2(), 李箫宁1,2(), 严寒1,2, 张名1,2, 沈鹏飞2,3, 赵浩1,2, 万丽1,2   

  1. 1. 中铁水务集团有限公司, 陕西 西安 710000
    2. 中国铁工投资建设集团有限公司, 北京 100000
    3. 中国中铁生态环境专业研发中心, 上海 200331
  • 收稿日期:2023-01-08 出版日期:2024-03-20 发布日期:2024-03-21
  • 作者简介:

    余波(1987— ),硕士,高工。E-mail:

    李箫宁,博士,工程师。E-mail:

Study on phosphorus recovery and struvite synthesis from municipal sludge pyrolysis residue

Bo YU1,2(), Xiaoning LI1,2(), Han YAN1,2, Ming ZHANG1,2, Pengfei SHEN2,3, Hao ZHAO1,2, Li WAN1,2   

  1. 1. China Railway Water Group Co. , Ltd. , Xi’an 710000, China
    2. China Tiegong Investment & Construction Group Co. , Ltd. , Beijing 100000, China
    3. Eco-Environmental Research and Development Center of China Railway Group, Shanghai 200331, China
  • Received:2023-01-08 Online:2024-03-20 Published:2024-03-21

摘要:

针对污泥残渣的资源化应用开展了磷资源回收实验研究,系统分析了酸种类和不同浸出条件对污泥残渣中磷浸出率的影响,同时考察了pH、n(Mg)∶n(N)∶n(P)对含磷溶液合成鸟粪石的影响。实验结果表明,污泥残渣在液固比为20 mL/g、盐酸浓度0.4 mol/L、浸出时间4 h条件下,磷浸出率可达96.9%。通过阳离子交换树脂净化后的磷净化液在pH=10、n(Mg)∶n(N)∶n(P)=1.2∶1.2∶1的条件下结晶率可达98.1%,且获得的鸟粪石晶体中重金属含量均满足《有机无机复混肥料》(GB/T 18877—2020)标准限值。综上,通过磷提取、净化和结晶后可最终将污泥残渣中79%的磷进行回收。

关键词: 污泥残渣, 资源化, 磷回收, 鸟粪石

Abstract:

An experimental study on the recovery of phosphorus resource was carried out for the resource application of sludge residue. The effects of acid species and different leaching conditions on the leaching of phosphorus from sludge residue were systematically analyzed,and the effects of pH and n(Mg)∶n(N)∶n(P) on the synthesis of struvite from the solution containing phosphorus were investigated. The results showed that the leaching rate of phosphorus from sludge residue could reach 96.9% under the conditions of liquid/solid ratio of 20 mL/g,hydrochloric acid concentration of 0.4 mol/L and leaching time of 4 h. Moreover,the crystallization rate of the phosphorus purification solution purified by cation exchange resin could reach 98.1% at pH=10,n(Mg)∶n(N)∶n(P)=1.2∶1.2∶1,and the heavy metal content in the obtained struvite met the standard limit of Organic and Inorganic Compound Fertilizer (GB/T 18877-2020). In summary,79% of phosphorus in sludge residue could be recovered after phosphorus extraction,purification and crystallization.

Key words: sludge residue, resource utilization, phosphorus recovery, struvite

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