Porous diatomite filter material, and preparation method and applications thereof

A technology of diatomite and filter material, applied in the field of water treatment, can solve problems such as metal ion pollution and easy peeling off of the coating

Inactive Publication Date: 2013-12-25
FOSHAN WATER GRP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to improve the removal of organic matter in micro-polluted source water during filtration, the most commonly used method is to use iron, aluminum oxide, etc. to coat the surface of quartz sand, and improve the organic matter in the filtration proces

Method used

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  • Porous diatomite filter material, and preparation method and applications thereof
  • Porous diatomite filter material, and preparation method and applications thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Embodiment 1: Determination of the optimal conditions for the preparation of a porous diatomite filter material.

[0037] Taking the calcination temperature, the amount of pore-forming agent added, the amount of flux added and the holding time as factors, and the removal rate of UV254 as the evaluation index, a three-level and four-factor L 9 (3 4 ) Orthogonal experiments are as follows:

[0038] Orthogonal test factor level table

[0039]

[0040] Orthogonal test table

[0041]

[0042] From the extreme R analysis in the table, it can be seen that the influence on the removal rate of UV254: R3>R1>R4>R2, that is

[0043] The influence of each factor on the removal rate of UV254 is in order: roasting temperature, pore-forming agent addition, holding time, and flux addition. From this, it can be concluded that the optimal level conditions among the factors are: calcination temperature = 1140°C, 40 parts of diatomite, 8 parts of pore-forming agent, 2 parts of...

Embodiment 2

[0044] Embodiment 2: A kind of preparation method of porous diatomite filter material

[0045] Take 40 parts of diatomite raw material, add 8 parts of graphite powder pore-forming agent, 2 parts of calcium carbonate, stir evenly, add water as binder to make mud with certain plasticity, and then manually knead it into a diameter of 5- Small balls of about 10mm are dried in an oven at 105°C for 2 hours, taken out and crushed, and passed through a 10-35 mesh sieve to obtain a diatomite filter material with a particle size of 0.5mm to 2mm. Curve (heat up to 400°C for 20 minutes, 600°C for 20 minutes, 800°C for 20 minutes, then naturally heat up to 1140°C) at 1140°C, hold for 30 minutes, then let it cool down to room temperature naturally, take it out and rinse the surface with tap water Fine powder, put it in an oven for drying, take the dried filter material and pass it through a 35-mesh sieve (0.5mm). The required amount of porous diatomite filter material is sequentially proce...

Embodiment 3

[0047] Embodiment 3: Experimental research on the removal of suspended solids by porous diatom filter material soil

[0048]Kaolin and tap water are used to prepare raw water with a turbidity of about 16NTU. The porous diatomite filter material obtained in Example 2, quartz sand and anthracite are respectively used as filter materials. Tests with a model filter column show that, without adding any coagulation With the same agent, same filtration rate and influent turbidity, the effluent turbidity curve of porous diatomite filter material is obviously better than that of quartz sand filter material and anthracite filter material. When the filtration rate is 6m / h, the average turbidity removal rate of the porous diatomite filter material within 18 hours is 98.44%, which is 1.56 times that of anthracite and 1.65 times that of quartz sand; The average turbidity removal rate of diatomite filter material within 18 hours is 94.26%, which is 1.86 times that of anthracite and 2.23 time...

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Abstract

The invention discloses a porous diatomite filter material. The porous diatomite filter material comprises, by weight, 40 portions of diatomite, 6 to 8 portions of a pore forming agent, 1 to 3 portions of a cosolvent and an appropriate amount of a binder. In addition, the invention also provides a preparation method and applications of the porous diatomite filter material. The porous diatomite filter material is large in specific surface area, possesses well-developed pores, is capable of reducing turbidity of waste water and removing organic substances effectively, and possesses acid resistance and impact resistance. The ability of reducing turbidity can be recovered just by back wash with water, and the ability of removing organic substances can be recovered by sodium hydroxide treatment.

Description

technical field [0001] The invention relates to the field of water treatment, more specifically, to a porous diatomite filter material and its preparation method and application. Background technique [0002] With the improvement of economic development, population growth, urbanization level and people's material and cultural living standards, the demand for water around the world and the daily water supply situation are becoming increasingly severe; the discharge of industrial wastewater and domestic sewage has also increased sharply, and water pollution is serious. Conflict between supply and demand of water resources. The pollution of water sources is manifested in the increase in the content of organic matter, ammonia nitrogen and other micro-pollutants in water, among which the pollution of organic matter is the most serious. [0003] At present, most water plants adopt a conventional water treatment process consisting of coagulation, sedimentation, filtration and ...

Claims

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Application Information

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IPC IPC(8): C04B35/14C04B38/06
Inventor 孙连鹏叶挺进陈莉莉郭五珍罗旺兴赖日明唐利利
Owner FOSHAN WATER GRP
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