Method for dewatering sludge and detecting water content

Abstract

The invention discloses a method for dewatering sludge and detecting the water content. The method comprises the following steps that 1, a calibration curve is built, wherein by using a Helmholtz coiland a detection coil, a standard sample with the known water content is obtained and subjected to low-field nuclear magnetic testing, the standard sample and the nuclear magnetic resonance semaphoreare subjected to primary linear fitting, and the calibration curve is built; 2, feeding, wherein sludge is introduced into a filter-press chamber so as to achieve feeding; 3, filter pressing for dewatering, wherein by using thrust of an oil cylinder and electromagnetic force between a left push plate and a right push plate, the filter-press chamber is subjected to filter pressing; 4, detection ofthe water content, wherein by using the electromagnetic force, a detection unit is pushed to move rightwards to the detection position, an echo attenuation curve is obtained, and a transverse relaxation time T2 curve of samples is obtained; 5, calculation of the water content of a sample, wherein the transverse relaxation time T2 curve, obtained in the step 4, of the samples is subjected to area integral and calculated to be substituted into the calibration curve in the step 1, and the water content is obtained. In the method, the water content of the sludge can be conveniently and quickly detected on line in the dewatering process without sampling.

Description

Technical field [0001] The invention relates to a sludge treatment technology, in particular to a method for sludge dewatering and moisture content detection. Background technique [0002] Sludge dewatering refers to the chemical conditioning treatment of sludge with higher moisture content, and then pressing and dewatering. Generally, the moisture content of the sludge can be reduced to less than 60%. The deep dehydrated sludge is not only in quality Reduced, the volume and transportation cost will also be greatly reduced. More importantly, it can make the subsequent disposal of sludge more extensive. It can be used as a low-grade fuel for power plants or as a material in the cement production process to achieve stability. , Harmless disposal and resource utilization. In the process of sludge treatment and disposal, the moisture content is an important indicator to characterize the sludge treatment method and the quality of the treatment effect. The change of the moisture conte...

AI Technical Summary

Problems solved by technology

NMR detection has the advantage of being non-destructive, but in the field of sludge treatment, there is no technology that uses NMR to detect online moisture content in the sludge treatment process, and the sludge treatment equipment cannot directly match the NMR device for detecting moisture content. and methods

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