Physicochemical sludge dewatering method

A sludge dewatering and sludge technology, applied in chemical instruments and methods, water/sludge/sewage treatment, sludge treatment, etc. Application value, high clarity effect

Pending Publication Date: 2021-01-08
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The average pore size of the microporous ceramic filter plate is generally 1-3 μm. The fine particles in the pulp enter the micropores of the filter plate during suction filtration, causing blockage. Long-term operation will cause the filter plate to fail to regenerate

Method used

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  • Physicochemical sludge dewatering method
  • Physicochemical sludge dewatering method

Examples

Experimental program
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Effect test

Embodiment 1

[0028] In this embodiment, the sludge dehydration process is as follows: figure 2 As shown, to treat the sludge feed liquid with a water content mass fraction of 98%, the selected flat ceramic membrane is an alumina ceramic microfiltration membrane, the average pore size of the membrane layer is 100nm, the thickness of the membrane layer is 20μm, and the thickness of the single ceramic plate is 5mm , its pure water permeability is 400L·m -2 h -1 · bar -1About, test its bending strength is about 40MPa. Among them, the membrane element is made of two flat ceramic membranes with a side length of 8cm, and is sealed with an acrylic plate support and epoxy resin glue. The membrane element contains a cavity and a water collection hole is left on one side , the ceramic membrane module 4 used for negative pressure suction can be designed to be composed of two membrane elements connected in parallel, the flat ceramic membrane module 4 in the sludge storage tank 1 is immersed in the ...

Embodiment 2

[0030] In this embodiment, the sludge dehydration process is as follows: figure 2 As shown, to treat sludge feed liquid with a water content mass fraction of 90%, the selected flat ceramic membrane is a zirconia ceramic microfiltration membrane, the average pore diameter of the membrane layer is 200nm, the thickness of the membrane layer is 40μm, and the thickness of a single ceramic plate is 6mm , its pure water permeability is 600L·m -2 h -1 · bar -1 About, test its bending strength is about 39MPa. Among them, the membrane element is made of two flat ceramic membranes with a side length of 8cm, which are sealed with the help of acrylic plate support and epoxy resin glue. hole. Such as figure 1 As shown, the ceramic membrane module 4 used for negative pressure suction can be designed to be composed of four membrane elements connected in parallel, and the flat ceramic membrane module 4 in the sludge storage tank 1 is immersed in the material liquid of physical and chemic...

Embodiment 3

[0032] In this embodiment, the sludge dehydration process is as follows: figure 2 As shown, to treat sludge feed liquid with a water content mass fraction of 88%, the selected flat ceramic membrane is a titanium oxide ceramic microfiltration membrane, the average pore size of the membrane layer is 300nm, the thickness of the membrane layer is 30μm, and the thickness of a single ceramic plate is 5.5 mm, pure water permeability is 900L m -2 h -1 · bar -1 About, test its bending strength is about 38MPa. Among them, the membrane element is made of two flat ceramic membranes with a side length of 9cm, which are sealed with the help of acrylic plate support and epoxy resin glue. The membrane element contains a cavity and a water collection hole is left on one side , the ceramic membrane module 4 used for negative pressure suction can be designed to be composed of two membrane elements connected in parallel, the flat ceramic membrane module 4 in the sludge storage tank 1 is immer...

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Abstract

The invention provides a physicochemical sludge dewatering method, which comprises the following steps of: firstly, immersing a ceramic membrane component in physicochemical sludge feed liquid, connecting one end of the ceramic membrane component with a vacuum pump for suction, lifting the membrane component out of the sludge feed liquid after a period of time, further performing sucking and dewatering, then lifting the ceramic membrane component to a filter cake tank, and conducting backflushing by adopting a scraper and an air pump; and after the filter cake is removed, lifting the flat plate membrane component to a cleaning pool, carrying out back washing by using the collected dehydration filtrate, and then repeating the steps to carry out suction dehydration; and cleaning the ceramicmembrane by using a chemical cleaning agent to recover the flux of the ceramic membrane after circulating for multiple times. The method provided by the invention is low in energy consumption, simpleand feasible, not only can reduce the moisture content of physicochemical sludge, but also can greatly reduce the turbidity of sludge dewatering filtrate by adopting a ceramic microfiltration membraneas a filtering medium, reduces the cost in the operation process by recycling the filtrate, and avoids the defect that a tubular membrane is not easy to discharge by using a flat plate ceramic membrane; and the practical application value of the ceramic membrane in the aspect of sludge dewatering is improved.

Description

technical field [0001] The invention belongs to the technical field of environmental protection and sludge treatment, and in particular relates to a method for dewatering physical and chemical sludge. Background technique [0002] In raw water purification and sewage treatment, it is often necessary to separate some suspended solids. In order to accelerate the precipitation and separation of suspended particulates, some iron salt flocculants are often added, such as adding ferrous sulfate to treat wastewater, and eventually iron hydroxide will be produced. Using a certain network The capture effect will settle the suspended particles in the wastewater, which will inevitably produce a large amount of sedimentation sludge with high water content, also known as physical sludge. Usually the water content of physicalized sludge is more than 85%, and this kind of high water content physicalized sludge contains a large amount of iron hydroxide composition, and the iron hydroxide co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/121B01D61/14B01D65/02B01D67/00B01D69/06B01D71/02
CPCC02F11/121B01D61/147B01D65/02B01D69/06B01D71/024B01D71/025B01D67/0039
Inventor 罗平吴超邱鸣慧
Owner NANJING UNIV OF TECH
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