| 污泥调理脱水后残余水分存在形态及空间分布 |
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| 引用本文： | 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.污泥调理脱水后残余水分存在形态及空间分布[J].环境工程,2023,41(3):42-48. |
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| 作者姓名： | 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 |
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| 作者单位： | 1. 中国科学院广州能源研究所, 广州 510640; |
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| 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) |
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| 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...
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| 关 键 词： | 污水污泥 脱水性能 低场核磁 水分分布 |
| 收稿时间： | 2021-10-13 |
WATER COMBINATION TYPES AND SPATIAL DISTRIBUTION OF RESIDUAL WATER IN SLUDGE CAKE |
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| 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. |
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