Quick measurement method for different forms of water in sludge

Abstract

The invention discloses a quick measurement method for different forms of water in sludge. The quick measurement method comprises the following steps of: (1) performing low-field nuclear magnetic resonance measurement on the sludge to obtain a transverse relaxation time T2 spectrum of different forms of water in the sludge; (2) stewing and settling activated sludge, preparing a standard sample by supernatant liquid at equal mass interval, and constructing a standard curve; (3) according to the obtained standard curve, matrixing the low-field nuclear magnetic resonance transverse relaxation time of the sludge to obtain three different forms of water, namely free water mass, interstitial water mass and surface combined water mass in the sludge; and (4) drying the sludge to be measured until the weight is balanced, subtracting the final mass from the initial mass, and calculating the fourth form of water in the sludge, namely the internal combined water mass. Compared with the conventional method, the quick measurement method for measuring the content of different forms of water in the sludge by a nuclear magnetic resonance technology has the advantages of short experiment time, harmlessness to experiment samples, precision of measurement and the like.

Description

technical field [0001] The invention relates to the field of measuring the characteristics of different water forms of sludge. Specifically, the invention relates to a rapid determination method for different forms of moisture in sludge. Background technique [0002] With the continuous improvement of my country's urban sewage treatment rate, the sludge output of urban sewage treatment plants has also increased sharply. In 2009, 1,992 urban sewage treatment plants were put into operation across the country, treating 28 billion m3 of sewage and producing about 20.05 million tons of sludge with a moisture content of 80%. With the increase of urbanization level, the amount of sludge will soon exceed 30 million tons. Sludge contains toxic and harmful substances such as pathogens, heavy metals, and persistent organic matter. Without effective treatment and disposal, it is very easy to cause secondary pollution to groundwater and soil, directly threatening environmental safety a...

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Problems solved by technology

[0004] Common research methods for different forms of moisture content in sludge mainly include: vacuum drying method, natural drying method, expansion test method, centrifugal sedimentation test method, filtration test method, pressing test method, differential scanning calorimetry method, combined Thermogravimetric analysis and differential thermal analysis, etc., the above-mentioned methods have the same problems and defects, namely: 1. Only the proportion of bound water and free water can be roughly obtained; 2. Free water, interstitial water, and surface bound water cannot be distinguished , internal bound water, and the influence of a certain treatment method on the content of each component cannot be obtained; 3. The test time is long and the efficiency is low, and online monitoring cannot be realized; 4. The operation is complicated, and the sample cannot be repeatedly tested

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