污泥调理脱水后残余水分存在形态及空间分布

吴佳欢; 张岳琦; 朱明; 杨光; 王文想; 姜红星; 段鹏飞; 蒋鹏; 袁浩然; 陈勇

doi:10.13205/j.hjgc.202303006

污泥调理脱水后残余水分存在形态及空间分布

doi: 10.13205/j.hjgc.202303006

吴佳欢^1,2,
张岳琦^1,3,
朱明^4,5,
杨光²,
王文想²,
姜红星²,
段鹏飞²,
蒋鹏²,
袁浩然^1,6, ,,
陈勇^1,6

1. 中国科学院广州能源研究所, 广州 510640;
2. 深圳市燃气集团股份有限公司, 广东深圳 518000;
3. 中国广核能源国际股份有限公司, 广东深圳 518028;
4. 生态环境部华南环境科学研究所, 广州 510655;
5. 国家环境保护环境污染健康风险评价重点实验室, 广州 510655;
6. 南方海洋科学与工程广东省实验室, 广州 511458

基金项目:

南方海洋科学与工程广东省实验室(广州)人才团队引进重大专项(GML2019ZD0101)

国家重点研发计划(2018YFC1901200)

详细信息

作者简介:
吴佳欢(1992-),女,博士,主要研究方向为有机固废清洁再利用。huaniewu@outlook.com

通讯作者:
袁浩然(1981-),男,博士生导师,主要研究方向为有机固废热转化。yuanhr@ms.giec.ac.cn

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出版历程
- 收稿日期: 2021-10-13
- 网络出版日期: 2023-05-26
- 刊出日期: 2023-03-01

WATER COMBINATION TYPES AND SPATIAL DISTRIBUTION OF RESIDUAL WATER IN SLUDGE CAKE

1. Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510640, China;
2. Shenzhen Gas Corporation Ltd, Shenzhen 518000, China;
3. China General Nuclear Power Corporation, Shenzhen 518028, China;
4. South China Institute of Environmental Sciences, Ministry of Ecology and Environment, Guangzhou 510655, China;
5. State Environmental Protection Key Laboratory of Environmental Pollution Health Risk Assessment, Guangzhou 510655, China;
6. Southern Marine Science and Engineering Guangdong Laboratory, Guangzhou 511458, China

摘要

摘要: 污泥脱水是污泥资源化利用的前提,采用高铁酸钾(K₂FeO₄)和污泥生物炭(脱水污泥在500℃热解制得污泥生物炭,记为BC500)作为调理剂对污泥进行预处理。污泥经3.00 g/L K₂FeO₄和9.00 g/L BC500调理脱水后,泥饼含水率降低至42.33%,较未经调理脱水后泥饼含水率(78.80%)减少36.47百分点。通过低场核磁共振技术(low field nuclear magnetic resonance,LF-NMR)检测脱水泥饼中残留水分的存在形式,并对水分种类进行划分。在K₂FeO₄氧化作用下,水分子与有机物的结合能被削弱,泥饼中残余结合水(0.23~10.72 ms)占比为99.68%~99.81%,毛细管水(70.00~700.00 ms)占比为0.19%~0.32%,原污泥泥饼中强结合水转化为弱结合水、毛细管水、自由水,弱结合水转化为毛细管水或自由水,毛细管水则转化为自由水,而自由水在机械脱水过程中几乎可以完全脱除。根据成像结果:泥饼中水分分布与图像亮度呈线性相关关系。该研究可为污泥深度脱水提供数据支撑和理论基础。
- 污水污泥 /
- 脱水性能 /
- 低场核磁 /
- 水分分布
Abstract: Sludge dewatering is a prerequisite for sludge utilization. In this study, potassium ferrate (K₂FeO₄) and sludge biochar (sludge biochar obtained by pyrolysis of dehydrated sludge at 500 ℃, recorded as BC500) were used as conditioning agents for sludge pretreatment. After the sewage sludge was conditioned with 3.00 g/L K₂FeO₄ and 9.00 g/L BC500, the water content of the sludge cake was reduced to 42.33%, which was 36.47 percentage points lower than that in raw sludge cake. The existing forms of residual water in the sludge cake were detected by the low-field nuclear magnetic field. According to the strength of binding energy, residual water was divided into three types: bound water (0.23~10.72 ms) accounting for 99.68%~99.81%, capillary water (70.00~700.00 ms) accounting for 0.19%~0.32%, and free water. The binding energy of water molecules and organic matter was weakened due to oxidation of K₂FeO₄, and it also made the strongly bound water in the original sludge cake transform into weakly bound water, capillary water or free water; weakly bound water was transformed into capillary water or free water; capillary water was transformed into free water; and free water can be almost completely removed by mechanical dewatering. The imaging results showed that water content in sludge cake was linearly related to the brightness of images. In the production process, real-time online detection results can be used to guide the pressure adjustment of the dewatering process. This research can provide data support and theoretical basis for future deep sludge dewatering study.
- sewage sludge /
- dewaterability /
- low-field nuclear magnetic field /
- water distribution

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参考文献(31)

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