ZHANGYang,LILi,TONGYi-wei,et al.Influence of Particle Disturbances on Turbidity Measurements in Low Turbidity Water[J].China Water & Wastewater,2022,38(20):131-138.
低浊水中颗粒扰动对浊度测量的影响
- Title:
- Influence of Particle Disturbances on Turbidity Measurements in Low Turbidity Water
- Keywords:
- turbidity; low turbidity water; pipe network water; desktop turbidity meter; disturbed turbidity; persistent turbidity
- 摘要:
- 城市供水系统从出厂水到末梢水中存在着庞大的低浊度水群体（浊度<0.5 NTU），在使用台式浊度仪检测其浊度值时存在数据波动明显、人工读数方法不统一等问题，使得这一群体水样的浊度检测结果可比性差，不利于对比分析。为此研究了大量此类低浊水的浊度测量曲线并对曲线波动规律及其产生原因进行了分析。结果表明，大部分浊度测量曲线均具有两大特征阶段，即波动阶段和平稳阶段，两阶段对应体现出扰动浊度和持久浊度；水样中致浊颗粒本身的沉淀特性是导致浊度测量曲线产生波动的普遍原因。将持久浊度作为检测结果能够更准确地表达低浊水的浊度，使数据在更广的范围内具有可比性和分析价值。为了读取持久浊度，建议检测低浊度水样时在样品置入仪器40 s或60 s后再进行数值的读取。
- Abstract:
- There is a large amount of low turbidity water (less than 0.5 NTU) in the urban water supply system from the product water of the waterworks to the terminal water. There are some problems when using a desktop turbidity meter to detect the low turbidity water, such as obvious data fluctuation and inconsistent manual reading methods, which makes the turbidity detection results of the water samples not comparable and is not good for comparative analysis. To solve this problem, a large number of turbidity measurement curves of this kind of low turbidity water were investigated, and the fluctuation law of the curves and the reasons were analyzed. Most turbidity measurement curves consisted of two stages, namely, the fluctuation stage and the steady stage. The two stages corresponded to the disturbed turbidity and the persistent turbidity. The precipitation characteristics of turbidity particles in water samples were the common reason for the fluctuation of turbidity measurement curve. Taking the persistent turbidity as the detection result reflected the turbidity of low turbidity water more accurately and made the data comparable and valuable in a wider range. To read the persistent turbidity, it is recommended to read the turbidity value of low turbidity water samples after 40 s or 60 s of sample placement in the instrument.
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