A method for rapid evaluation of dewatering performance of oxidatively conditioned sludge based on redox potential

A technology for sludge dehydration and dehydration performance, which is applied in the directions of oxidation treatment of sludge, dehydration/drying/thickened sludge treatment, and electrochemical variables of materials, which can solve the problems of poor repeatability of experimental data, complicated operation, and long time consumption, etc., and achieve The sampling process is simple and easy, the operation is simple, and the effect of requiring less samples

Active Publication Date: 2019-12-13
HUAZHONG UNIV OF SCI & TECH
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Problems solved by technology

[0006] In view of the above defects or improvement needs of the prior art, the purpose of the present invention is to provide a method for quickly evaluating the dewatering performance of oxidation-conditioned sludge based on the oxidation-reduction potential, wherein the overall process design of the method and the selection of key measured parameters Compared with the existing technology, it can effectively solve the problems of complex operation, long time-consuming, poor repeatability of experimental data, and the need for additional agents in the method of evaluating the dewatering performance of oxidation-conditioned sludge. This method is based on oxidation-reduction potential. It can quickly and effectively compare and evaluate the dewatering performance index of oxidative chemical conditioning sludge. The invention can measure the dewatering performance of oxidative conditioning sludge, avoiding the weak oxidation and strong oxidation caused by the inability to accurately and effectively evaluate the sludge dewatering performance in oxidative conditioning. Oxidation problem; and, the present invention further optimizes the evaluation criterion, utilizes the relational expression satisfied between ΔORP and the sludge dewatering performance index, on the one hand, can directly judge the dewatering performance of the sludge after oxidation conditioning treatment, and on the other hand On the one hand, according to the desired dewatering performance requirements of the sludge after oxidative conditioning treatment, the ORP change value requirements corresponding to these requirements (ΔORP) can also be preset. 0 , and then judge whether the corresponding actual oxidation-conditioned sludge dewatering performance of ΔORP obtained by the experimental measurement matches the expected oxidation-conditioned sludge dewatering performance; using the present invention, the use of oxidation technology can be effectively controlled, avoiding the need to add Oxidant content is too large or too small

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  • A method for rapid evaluation of dewatering performance of oxidatively conditioned sludge based on redox potential
  • A method for rapid evaluation of dewatering performance of oxidatively conditioned sludge based on redox potential
  • A method for rapid evaluation of dewatering performance of oxidatively conditioned sludge based on redox potential

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Experimental program
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Embodiment 1

[0052] In this embodiment, based on the oxidation-reduction potential (ORP), the dehydration performance of the same oxidant with different concentrations of sludge is quickly compared and evaluated, and the following steps are carried out:

[0053] (1) The sludge in this example is taken from the thickening tank of Shahu Sewage Treatment Plant in Wuhan. Sludge samples were collected and transported back in polypropylene buckets. The sludge was pre-filtered through a 1mm standard sieve to remove large sand and gravel, and stored in a 4°C freezer. Since the sludge is perishable, the experiments were completed within 3 days after the sludge was collected;

[0054] (2) Take 40mL of raw mud in a 50mL centrifuge tube, add 0.1-0.6mmol g -1 VS Potassium persulfate compound salt (Oxone), oscillated at 150rpm in a horizontal shaker for 20min;

[0055] (3) Measure the change of ORP within 30 seconds in the process of conditioning sludge with different concentrations of Oxone;

[005...

Embodiment 2

[0059] In this example, based on the oxidation-reduction potential (ORP), the dehydration performance of different oxidants with the same concentration of sludge is quickly compared and evaluated, and the following steps are carried out:

[0060] (1) The sludge in this example is taken from the thickening tank of Shahu Sewage Treatment Plant in Wuhan. Sludge samples were collected and transported back in polypropylene buckets. Filter out large sand and gravel through a 1mm standard sieve, and store in a 4°C freezer. Since the sludge is perishable, the experiments were completed within 3 days after the sludge was collected;

[0061] (2) Pour 10kg of sludge into the sludge conditioning tank first, and add 0.9mmol g -1 VS potassium persulfate (K 2 S 2 o 8 ), potassium persulfate compound salt (Oxone) and hydrogen peroxide (H 2 o 2 ), let the conditioning agent and the sludge fully mix and react for 20 minutes. At the same time, the change value of ORP within 30 seconds is...

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Abstract

A method for rapidly evaluating dehydration performance, based on an oxidation reduction potential, of sludge subjected to oxidation conditioning is disclosed. Through measurement of influences of oxidation conditioning on the oxidation reduction potential (ORP) of the sludge, the dehydration performance of the sludge subjected to oxidation conditioning is evaluated according to an oxidation reduction potential (ORP) change measured. The method includes introducing an ORP electrode into a sludge system to be treated, measuring the oxidation reduction potential (ORP) in real time, adding an oxidation conditioning agent into the sludge system to be treated, and determining the dehydration performance of the sludge subjected to oxidation conditioning according to an ORP change. Based on the oxidation reduction potential, the dehydration performance index of the sludge subjected to oxidation chemical conditioning is rapidly and effectively compared and evaluated. Compared with the prior art, the method can effectively solve problems, such as complex operation, long time, poor experiment data repeatability and a need of additionally adding agents, of dehydration performance evaluating methods for sludge subjected to oxidation conditioning.

Description

technical field [0001] The invention belongs to the technical field of sludge treatment, and more specifically relates to a method for quickly evaluating the dewatering performance of oxidation-conditioned sludge based on oxidation-reduction potential, and the method can quickly evaluate the dewatering performance of oxidation-chemically-conditioned sludge. Background technique [0002] Sludge is the main by-product of sewage treatment. It has the characteristics of high water content, large output and high difficulty in treatment, which brings great challenges to the field of environmental engineering. The annual production of municipal sludge in my country is as high as 30 million tons (calculated with a moisture content of 80wt%). The moisture in the sludge exists in the form of interstitial water or free water (about 65-85% of the sludge moisture), capillary water (about 15-20% of the sludge moisture), adsorbed water (<10%) and Bound water (<10%) four. Due to the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/26C02F11/06C02F11/14
CPCC02F11/06C02F11/14G01N27/26
Inventor 杨家宽肖可可吕阳祝雨薇虞文波裴康越梁莎胡敬平侯慧杰刘冰川
Owner HUAZHONG UNIV OF SCI & TECH
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