球状纳米CaO2的制备及其协同电渗透污泥深度脱水

doi:10.16085/j.issn.1000-6613.2020-1552

化工进展 ›› 2021, Vol. 40 ›› Issue (7): 4047-4054.DOI: 10.16085/j.issn.1000-6613.2020-1552

球状纳米CaO₂的制备及其协同电渗透污泥深度脱水

李亚林¹(), 刘蕾¹, 李坤鹏¹, 林康², 窦雪¹, 毕雅洁¹

^1.河南工程学院资源与环境学院，河南郑州 451191
^2.长江大学资源与环境学院，湖北武汉 430100

收稿日期:2020-08-05 修回日期:2020-09-21 出版日期:2021-07-06 发布日期:2021-07-19
通讯作者: 李亚林
作者简介:李亚林（1984—），男，博士，副教授，硕士生导师，研究方向为固体废物处理处置与资源化。E-mail: li_ya_lin@haue.edu.cn。
基金资助:
教育部中西部高等学校青年骨干教师国内访问学者项目(19042);河南省科技攻关项目(162102310402);河南省高等学校青年骨干教师培养计划(2019GGJS239);河南省科技攻关项目(212102310064)

Preparation of spherical nano-CaO₂ and its application in sludge deep-dewatering coupled with electro-osmotic

LI Yalin¹(), LIU Lei¹, LI Kunpeng¹, LIN Kang², DOU Xue¹, BI Yajie¹

^1.Department of Resources and Environment, Henan Institute of Engineering, Zhengzhou 451191, Henan, China
^2.College of Resources and Environment, Yangtze University, Wuhan 430100, Hubei, China

Received:2020-08-05 Revised:2020-09-21 Online:2021-07-06 Published:2021-07-19
Contact: LI Yalin

摘要/Abstract

摘要：

为了研究纳米CaO₂协同电渗透污泥深度脱水的可行性，首先采用钙盐法制备纳米CaO₂并优化了其制备条件，将制备的纳米CaO₂协同电渗透技术对城市污泥进行了深度脱水研究。结果表明，分散剂用量、搅拌速率、H₂O₂滴加速率及用量均会对CaO₂的纯度、产率和形貌造成影响，在分散剂用量为100mL、搅拌速率为500r/min、H₂O₂用量为22.5mL、H₂O₂滴加速率为0.75mL/min时，制备得到CaO₂的纯度和产率分别可以达到79.13%和74.62%，自制CaO₂呈现球状或椭球状，粒度在45～300nm之间；当CaO₂投加量为100mg/g DS、电压为50V、初始污泥量为705g时，自制纳米CaO₂协同电渗透可以将污泥含水率降至67.52%，相较于同样条件下使用市售CaO_2，污泥含水率降低了10.91%。

关键词: 过氧化钙, 氧化, 电渗透, 城市污泥, 脱水, 废物处理

Abstract:

In order to investigate the feasibility of sewage sludge deep-dewatering by coordination of nano-CaO₂ and electro-osmotic, the nano-CaO₂ was fabricated by calcium salt method under optimized parameters firstly, and then the prepared nano-CaO₂ coupled with electro-osmotic were used to investigate the deep-dewatering of sewage sludge. The results showed that the purity, yield and morphology of CaO₂ would be affected by dispersant dosage, stirring speed, the dosage and drip rate of H₂O₂.The purity and yield of CaO₂ could reach 79.13% and 74.62% with dispersant dosage of 100mL, stirring speed of 500r/min, drip rate of 0.75mL/min and H₂O₂ dosage of 22.5mL respectively. Homemade nano-CaO₂ was spherical or ellipsoidal, with a particle size within 45—300nm. The water content of dewatered sludge could be reduced to 67.52% with self-made nano-CaO₂ dosage of 100mg/g DS, voltage of 50V, initial sludge dosage of 705g. Compared to commercially available CaO₂ under the same conditions, the water content of dewatered sludge was reduced by 10.91%.

Key words: calcium peroxide, oxidation, electro-osmotic, sewage sludge, dewatering, waste treatment

中图分类号:

X705

李亚林, 刘蕾, 李坤鹏, 林康, 窦雪, 毕雅洁. 球状纳米CaO₂的制备及其协同电渗透污泥深度脱水[J]. 化工进展, 2021, 40(7): 4047-4054.

LI Yalin, LIU Lei, LI Kunpeng, LIN Kang, DOU Xue, BI Yajie. Preparation of spherical nano-CaO₂ and its application in sludge deep-dewatering coupled with electro-osmotic[J]. Chemical Industry and Engineering Progress, 2021, 40(7): 4047-4054.

图/表 11

图1 污泥电渗透脱水装置

图2 搅拌速率及分散剂用量对CaO2纯度和产率的影响

图3 不同搅拌速率条件下制得CaO2的SEM图像

图4 不同分散剂用量条件下制得CaO2的SEM图像

图5 H2O2滴加速率及用量对CaO2纯度和产率的影响

图6 不同H2O2滴加速率条件下制得CaO2的SEM图像

图7 不同H2O2用量条件下制得CaO2的SEM图像

图8 市售CaO2与自制CaO2表征结果

图9 不同操作参数对污泥脱水的影响

表1 自制和市售CaO2协同电渗透污泥脱水效果对比

原污泥含水率/%	脱水泥饼含水率/%
原污泥含水率/%	未添加CaO₂	市售CaO₂	自制CaO₂
98.8	85.30	78.43	67.52

图10 原污泥和CaO2脱水污泥的SEM图像

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球状纳米CaO₂的制备及其协同电渗透污泥深度脱水

Preparation of spherical nano-CaO₂ and its application in sludge deep-dewatering coupled with electro-osmotic

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