Manganese salt sludge conditioner and sludge dewatering method

A technology for sludge conditioning and conditioning agent, which is applied in sludge treatment, electrochemical sludge treatment, water/sludge/sewage treatment, etc. It can solve the operation requirements and high energy consumption, the influence of climate factors, and the damage of filter media. and other problems, to achieve the effect of speeding up the dehydration rate, low price, and accelerated removal

Inactive Publication Date: 2016-12-21
BEIJING FORESTRY UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The natural drying method is simple, but it occupies a large area, the treatment cycle is long, the sanitary conditions are poor, and it is affected by climate factors
Thermal drying can remove the difficult-to-remove surface water and hydrated water inside the sludge, which can maximize the reduction of sludge, but the process equipment is complicated, the operation requirements and energy consumption are high
Mechanical dehydration such as compression filtration, gravity settling, centrifugation, etc. can effectively remove free water in sludge, but interstitial water, surface water, and hydrated water are difficult to remove
During the dehydration process, with the removal of free water, particles will accumulate on the filter medium, resulting in blockage of the medium, affecting the further progress of dehydration; the application of mechanical pressure will also cause damage to the filter medium

Method used

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  • Manganese salt sludge conditioner and sludge dewatering method
  • Manganese salt sludge conditioner and sludge dewatering method
  • Manganese salt sludge conditioner and sludge dewatering method

Examples

Experimental program
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Effect test

Embodiment 1

[0031] After the activated sludge was retrieved, it was concentrated by gravity for 2 hours and passed through 10-mesh and 50-mesh screens. The sludge concentration (MLSS) reached 16.2g / L, the moisture content was 98.35%, and the pH value was 7.34.

[0032] 1) Put the activated sludge in the container.

[0033] 2) Accurately weigh 0.03mol / L of MnCl in wet sludge 2 , at 300rpm / min stirring intensity MnCl 2 Put it into the sludge quickly and stir for 30 minutes.

[0034] 3) Transfer the conditioned sludge to a vacuum filtration device, and perform suction filtration at a pressure of 0.6 MPa for 15 minutes. Collect all the filtrate after the reaction and weigh its mass, collect the dehydrated sludge in the sludge chamber after the reaction, and measure its water content by gravimetric method.

[0035] The measurement results are shown in Table 1.

Embodiment 2

[0037] After the activated sludge was retrieved, it was concentrated by gravity for 2 hours and passed through 10-mesh and 50-mesh screens. The sludge concentration (MLSS) reached 16.2g / L, the moisture content was 98.35%, and the pH value was 7.34.

[0038] 1) Put the activated sludge in the container.

[0039] 2) Accurately weigh 0.05mol / L KMnO in wet sludge 4 , KMnO 4 Put it into the sludge quickly and stir for 30 minutes.

[0040] 3) Transfer the conditioned sludge to a vacuum filtration device, and perform suction filtration at a pressure of 0.6 MPa for 15 minutes. Collect all the filtrate after the reaction and weigh its mass, collect the dehydrated sludge in the sludge chamber after the reaction, and measure its water content by gravimetric method.

[0041] The measurement results are shown in Table 1.

Embodiment 3

[0043] After the activated sludge was retrieved, it was concentrated by gravity for 2 hours and passed through 10-mesh and 50-mesh screens. The sludge concentration (MLSS) reached 16.2g / L, the moisture content was 98.35%, and the pH value was 7.34.

[0044] 1) Put the activated sludge in the container.

[0045] 2) Accurately weigh 0.04mol / L KMnO in wet sludge 4 and NaHSO of 0.2mol / L wet sludge 3 , KMnO 4 Put it into the sludge quickly and stir for 30 minutes.

[0046] 3) Transfer the conditioned sludge to a vacuum filtration device, and perform suction filtration at a pressure of 0.6 MPa for 15 minutes. Collect all the filtrate after the reaction and weigh its mass, collect the dehydrated sludge in the sludge chamber after the reaction, and measure its water content by gravimetric method.

[0047] The measurement results are shown in Table 1.

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Abstract

The invention provides a manganese salt sludge conditioner and a sludge dewatering method. The manganese salt sludge conditioner comprises compounds of bivalent, trivalent, tetravalent and heptavalent manganese; the manganese salts can cause sludge floc flocculation or extracellular organic matter damage; partial bound water is released; in addition, a sludge framework and a dewatering passage can be built. The method for conditioning and dewatering the sludge by using the sludge conditioner comprises the following steps that (1) sludge pretreatment is performed; (2) manganese slat, including single Mn(II) salts or Mn(VII) salts and KMnO4 and NaHSO3(Na2SO3) are added; oxidation-reduction reaction is performed to produce Mn(III) and reaction products of Mn(II), Mn(IV) and Mn(VII) in situ; (3) sludge dewatering is performed; suction filtration or horizontal electric field is used for water removal. The manganese salt sludge conditioner and the sludge dewatering method provided by the invention have the advantages that the dewatering time is short; the operation is simple; pathogenic microorganisms in the sludge are killed in an auxiliary way; the water content of the sludge can be effectively reduced; the safe and sanitation performance of the sludge can be improved.

Description

technical field [0001] The invention relates to a manganese salt sludge conditioner and a sludge dehydration method using the manganese salt conditioner, belonging to the technical field of environmental protection. Background technique [0002] Municipal sludge is solid waste produced by sewage treatment units in municipal sewage treatment plants. In China, the total output of sludge increased at an annual rate of 13% from 2007 to 2013. In 2013, 6.25 million tons of dry weight sludge was produced. It is estimated that by 2018, the output of sludge with 80% moisture content will exceed 40 million t / a. The main components of municipal sludge are water (about 95% to 99%) and organic matter, as well as a small amount of nitrides, phosphides, polycyclic aromatic hydrocarbons, heavy metal ions, etc., and each component passes through special forces such as electrostatic force, Van der Waals forces and hydrophobic forces are combined together. The main characteristics of munic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/14C02F11/12C02F11/00
CPCC02F11/14C02F11/006C02F11/12C02F11/121
Inventor 王毅力郭昕昕
Owner BEIJING FORESTRY UNIVERSITY
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