Method for electric dehydration of sludge strengthened by conditioning salt

An electric dehydration and sludge technology, which is applied in the direction of electrochemical sludge treatment, chemical instruments and methods, water/sludge/sewage treatment, etc., can solve the problem of high energy consumption, reduce dehydration energy consumption, reduce energy consumption, The effect of enhancing the effect

Active Publication Date: 2017-06-13
SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to overcome the problem of high energy consumption in the current sludge single electroosmosis dewatering technology, and to provide a new method for strengthening sludge dehydration

Method used

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  • Method for electric dehydration of sludge strengthened by conditioning salt
  • Method for electric dehydration of sludge strengthened by conditioning salt
  • Method for electric dehydration of sludge strengthened by conditioning salt

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] as attached figure 1 As shown, this embodiment provides a sludge dewatering equipment with vertical pressurization combined with electro-osmosis technology, including a pressure applicator 3, an anode plate 4, a cathode plate 5, a drainage device 6 and a water storage device 7 arranged from top to bottom , also includes an external power supply 2; the anode plate and the cathode plate are respectively connected to the external power supply 2 (the connection method refers to the existing power supply anode and cathode connection mode); the anode plate 4 and the cathode plate 5 are arranged horizontally, and the anode plate 4 Placed on the cathode plate 5, the space between the anode plate 4 and the cathode plate 5 is used as a place for filling sludge, and the cathode plate 5 is provided with a number of holes 8 for the water in the sludge to flow out. The number and diameter of the holes 8 are not strictly limited, as long as they are suitable for water to flow out.

Embodiment 2

[0030] Take 120.00g of sludge, mix it fully with 5mL of deionized water, and fill it into the sludge filling tank with a thickness of 0.5cm. Place a 300-mesh nylon mesh filter cloth between the sludge and the cathode plate, adjust the pressure to 15kPa, and the voltage Combined electric dehydration test after 8V. It takes 56.50±0.71min for electroosmosis to reduce the moisture content of sludge to 60%, and the dehydration energy consumption is 0.054±0.012kWh / kg sludge.

[0031] This embodiment can use the device described in Embodiment 1.

Embodiment 3

[0033] The schematic diagram of the process method of this embodiment is shown in the attached image 3 shown. Take 120.00g of sludge, weigh Na at the ratio of 1.0g / kg of sludge 2 HPO 4 , Dissolve it in 5mL deionized water and mix it fully with the sludge, fill it into the sludge filling tank, the filling thickness is 0.5cm, place a 300-mesh nylon mesh filter cloth between the sludge and the cathode plate, adjust the pressure to 15kPa, and the voltage to After 8V, the combined electric dehydration test was carried out. It takes 25.00±1.41min for electroosmosis to reduce the moisture content of sludge to 60%, and the dehydration energy consumption is 0.033±0.001kWh / kg sludge.

[0034] This embodiment can use the device described in Embodiment 1.

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Abstract

The invention discloses a method for electric dehydration of sludge strengthened by a conditioning salt. A proper conditioning salt is added into the sludge to be dewatered, then the combination of mechanical pressing and a conventional electroosmosis technique is adopted for the dehydration, a scientific method of the mechanical pressing combined with salt conditioning effectively reduces the energy consumption of electroosmosis dehydration of the sludge, the time for electroosmosis dehydration is further shortened, and the effect of the electroosmosis dehydration is enhanced. In the condition of the combined electric dehydration, the required time for the water content in the sludge is reduced to 60% is 25-35 min, and the energy consumption of dehydration is 0.033-0.065 kWh / kg sludge.

Description

technical field [0001] The invention relates to the technical field of sewage sludge treatment, in particular to a conditioning salt-enhanced sludge electrolytic [0002] Dehydration method. Background technique [0003] With the continuous development of the economy and the gradual improvement of people's living standards, the total discharge of domestic sewage in China continues to increase every year. Sludge is an inevitable product of sewage treatment plants in the process of sewage treatment. According to the report compiled by China Industry Information Network, by 2015, the annual output of sludge with a water content of 80% in my country reached 47.03 million tons. [0004] The treatment and disposal of municipal sludge is a problem that should attract people's attention. Some foreign developed countries already had complete sets of sludge treatment equipment in the 1960s. However, due to the long-term existence of the idea of ​​"heavy water and light mud" in my co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/00C02F11/14
CPCC02F11/006C02F11/121C02F11/14
Inventor 张淑娟蔡白桦江纪修张旭兰谢子钊韦献革
Owner SUN YAT SEN UNIV
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