Chemical Industry and Engineering Progress ›› 2020, Vol. 39 ›› Issue (2): 805-811.DOI: 10.16085/j.issn.1000-6613.2019-0844

• Resources and environmental engineering • Previous Articles    

Effects of Fenton treatment on sewage sludge dewaterability, heavy metal speciation and leaching efficiency

Jinxin ZHENG1(),Chunsheng QIU1,2(),Chenchen WANG1,2,Nannan LIU1,2,Dong WANG1,2,Shaopo WANG1,2,Liping SUN1,2,Yifan ZHANG3   

  1. 1.School of Environmental and Municipal Engineering, Tianjin Chengjian University, Tianjin 300384, China
    2.Tianjin Key Laboratory of Aquatic Science and Technology, Tianjin 300384, China
    3.Tianjin Capital Environmental Protection Group Company Limited, Tianjin 300381, China
  • Received:2019-05-26 Online:2020-03-12 Published:2020-02-05
  • Contact: Chunsheng QIU

Fenton处理对污泥脱水性、重金属形态及生物淋滤效率影响

郑金鑫1(),邱春生1,2(),王晨晨1,2,刘楠楠1,2,王栋1,2,王少坡1,2,孙力平1,2,张轶凡3   

  1. 1.天津城建大学环境与市政工程学院,天津 300384
    2.天津市水质科学与技术重点实验室,天津 300384
    3.天津创业环保集团股份有限公司,天津 300381
  • 通讯作者: 邱春生
  • 作者简介:郑金鑫(1995—),男,硕士研究生,研究方向为废弃物资源化。E-mail:17865163996@163.com
  • 基金资助:
    水体污染控制与治理科技重大专项(2017ZX07106001);天津市教委科研计划(2016CJ07);天津市企业科技特派员项目(18JCTPJC59600)

Abstract:

To investigate the law of heavy metal migration and transformation during sludge pretreatment process, the sludge was treated with different amounts of Fenton reagents, and the chemical morphological changes of the heavy metals, including Zn, Cd, Mn and Ni, and the dissolution behavior in the subsequent bioleaching process were analyzed. The results showed that after Fenton treatment (Fe2+=1.00g/L, H2O2=9.00g/L), the capillary suction time decreased in a short time, but it had no significant effect on the final sludge dewatering after bioleaching. The proportion of the unstable states of heavy metals Zn, Cd and Mn increased from 37%, 84% and 79% to 90%, 93% and 84%, respectively. But there was no significant change in Ni. Furthermore, the contents of the four heavy metals Zn, Cd, Mn and Ni after bioleaching decreased from 3451.52mg/kg, 6.45mg/kg, 443.40mg/kg and 94.96mg/kg to 376.74mg/kg, 1.10mg/kg, 141.66mg/kg and 21.77mg/kg, respectively. Compared with the individual bioleaching treatment process, the residual content of these four heavy metals was decreased by 36.2%, 26.17%, 30.92% and 27.89%, respectively. The relative dissolution rates of the heavy metals in the bioleaching process were described by the kinetic equation, and the order was Mn<Cd<Zn<Ni.

Key words: sewage sludge, Fenton, dewaterability, heavy metal speciation, bioleaching

摘要:

为考察污泥预处理过程中重金属迁移转化规律,通过投加不同量的Fenton试剂对污泥进行处理,分析了Zn、Cd、Mn、Ni四种重金属的化学形态变化与后继生物淋滤过程的溶出行为。研究结果表明,污泥经Fenton处理后,毛细吸水时间在短时间内降低,但对生物淋滤后最终的污泥脱水性没有显著提升作用;重金属Zn、Cd、Mn的不稳定态(弱酸提取态、可还原态)比例不同程度提高,当投加Fe2+=1.00g/L、H2O2=9.00g/L时,其比例分别由37%、84%、79%上升至90%、93%、84%,但Ni无明显变化。此外,Fenton处理污泥中Zn、Cd、Mn、Ni四种重金属生物淋滤后含量分别由3451.52mg/kg、6.45mg/kg、443.40mg/kg、94.96mg/kg降至376.74mg/kg、1.10mg/kg、141.66mg/kg、21.77mg/kg,比单独生物淋滤处理污泥重金属残余量分别降低了36.20%、26.17%、30.92%和27.89%。利用动力学方程较好地描述了生物淋滤过程中Zn、Cd、Mn、Ni四种重金属的溶出速率的相对大小,排序为Mn<Cd<Zn<Ni。

关键词: 污泥, Fenton, 脱水性, 重金属形态, 生物淋滤

CLC Number: 

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