Magnetic biological carrier and preparation method thereof

A biological carrier and magnetic technology, applied in the field of aerated biological filter filler and its preparation, can solve the problems of decay, the peeling off of the biological film on the surface of the filter material, the caking of the filter material, etc., so as to improve the nitrification reaction rate and the concentration of the substrate. , the effect of improving the adsorption capacity

Inactive Publication Date: 2011-10-26
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] In my country, the current sewage reuse rate is less than 5%. Economy and safety are the prerequisites for realizing sewage reuse. The application of reclaimed water still has problems such as urban landscape water corrosion and industrial equipment pipeline system corrosion to varying degrees.
However, due to the adhesion of the biofilm in the biological aerated filter, the filter material of the biological aerated filter is often agglomerated, and the agglomerated filter material cannot be well destroyed during backwashing, resulting in a more and more serious short circuit of the water flow in the biological aerated filter
In addition, due to strong backwashing, the biofilm on the surface of some filter materials is excessively shed, resulting in a serious deterioration of the water quality of the effluent treated by the biological aerated filter for a period of time after backwashing, and it takes several hours to return to normal

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] In this embodiment, the raw materials of the magnetic biocarrier constitute by mass percentage:

[0024] Natural zeolite 70%, limonite ore 10%, solid water glass 10%, coal powder 10%.

[0025] In this example, the magnetic biocarrier was prepared as follows:

[0026] Mix natural zeolite, limonite ore and coal powder, crush and pass through a 60-mesh sieve to obtain the mixture, add water to the solid water glass and stir to dissolve the solid water glass to obtain a water glass solution, the amount of water added is 30-60% of the weight of the mixture %, then mix the mixture with water glass solution and stir evenly, use a granulator to granulate into pellets with a particle size of 2-10mm, and dry the pellets naturally or until the water content is less than 10% to obtain a magnetic biological carrier blank body; the obtained green body is placed in a high-temperature furnace, and calcined at 600-1100° C. for 30 minutes under a CO atmosphere to obtain a magnetic bioca...

Embodiment 2

[0029] In this embodiment, the raw materials of the magnetic biocarrier constitute by mass percentage:

[0030] 60g of natural zeolite, 15g of sulfuric acid cinder, 5g of sodium hydroxide, 125g of dewatered activated sludge (moisture content 84%) from a domestic sewage treatment plant, and a dry weight of 20g.

[0031] In this example, the magnetic biocarrier was prepared as follows:

[0032] Weigh 125g of belt filter dewatered activated sludge from a domestic sewage treatment plant, add 5g of sodium hydroxide to the sludge, stir for 30 minutes, then add 60g of zeolite powder and 15g of iron oxide, mix and knead, and granulate The machine molds the mixed material into 3-6mm granules, and dries at 100°C until the water content is less than 10%, so as to obtain the green body of the magnetic biological carrier. The sample is put into a tube furnace, and calcined at 600-900° C. for 1-2 h in a CO atmosphere to obtain a magnetic biocarrier.

[0033] The magnetic biocarrier prepar...

Embodiment 3

[0035] In this embodiment, the raw materials of the magnetic biocarrier constitute by mass percentage:

[0036] Natural zeolite 40%, hematite ore 20%, attapulgite clay 20%, straw 20%.

[0037] In this example, the magnetic biocarrier was prepared as follows:

[0038] Mix natural zeolite, hematite ore and straw, crush and pass through a 60-mesh sieve to obtain the mixture, add water to the attapulgite clay and stir, then mix the mixture with the attapulgite clay solution and stir evenly, use a granulator Granulate into pellets with a particle size of 2-10mm, air-dry the pellets naturally or until the water content is less than 10% to obtain a magnetic biocarrier body; place the obtained body in a high-temperature furnace, and place the green body in a CO atmosphere at 600- Calcined at 1100° C. for 30 minutes to obtain a magnetic biocarrier.

[0039] The magnetic biocarrier prepared in this embodiment has strong magnetism, and its magnetic susceptibility is greater than 1000SI...

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Abstract

The invention discloses a magnetic biological carrier and a preparation method thereof. The raw materials of the magnetic biological carrier comprise aggregate, iron oxide, a binder and a reducing agent. The preparation method of the magnetic biological carrier comprises the following steps of: mixing the aggregate, iron oxide and the reducing agent, crushing, screening with a 60-mesh sieve to obtain a mixed material, adding water which is 30-60% of the mixed material by weight to the binder, stirring for dissolving the binder to obtain a binder solution, then mixing the binder solution with the mixed material, uniformly stirring, granulating and shaping to obtain 2-10 mm granules, drying the granules till the water content of the granules is less than 10%, and calcining at the temperature of 350-1100 DEG C for 0.2-10 hours to obtain the magnetic biological carrier. The magnetic biological carrier provided by the invention can be applied to the deep treatment of secondary treatment water of domestic sewage, meets the requirements of landscape water replenishing and circulating cooling water treatment, and can be used for realizing the deep treatment and resource utilization of industrial wastewater.

Description

1. Technical field [0001] The invention relates to a biological aerated filter filler and a preparation method thereof, in particular to a magnetic biological carrier and a preparation method thereof. 2. Background technology [0002] In my country, the current sewage reuse rate is less than 5%. Economy and safety are the prerequisites for the realization of sewage reuse. The application of reclaimed water still has problems such as corrosion of urban landscape water and corrosion of industrial equipment piping systems to varying degrees. The safety of reclaimed water seriously restricts the recycling of secondary drainage. Among them, the safety problems caused by ammonia nitrogen in reclaimed water are the most prominent. [0003] Biological aerated filter is also called submerged biological aerated filter. Foreign countries began to conduct research in the early 20th century, and basically took shape in the late 1980s. After continuous improvement, various forms of biol...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/10
CPCY02W10/10
Inventor 谢晶晶陈天虎谢巧勤陈冬钱家忠鲍滔束松林
Owner HEFEI UNIV OF TECH
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