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Method for producing tap water by using magnetic weighting agent coagulation magnetic separation technology

A technology of weighting agent and magnetic separation, applied in chemical instruments and methods, flocculation/sedimentation water/sewage treatment, magnetic field/electric field water/sewage treatment, etc. Problems such as large area

Active Publication Date: 2021-03-19
HNAC TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the whole production process of tap water, the alum flower precipitation operation takes about 2 to 4 hours in spring, summer and autumn, and takes about 3 to 4 hours in winter, and sometimes even longer precipitation time is not enough. National standards for water quality and quantity
At present, in the field of urban tap water production technology, the main problems that exist are as follows: the precipitation of alum flowers takes a long time; it is difficult to ensure the output and quality of water products when the temperature is low in winter and low turbidity; excessive coagulant is added, and it will be damaged due to residues. Affect the quality; and increase production and expand the area

Method used

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  • Method for producing tap water by using magnetic weighting agent coagulation magnetic separation technology
  • Method for producing tap water by using magnetic weighting agent coagulation magnetic separation technology
  • Method for producing tap water by using magnetic weighting agent coagulation magnetic separation technology

Examples

Experimental program
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preparation example Construction

[0060] 1. Preparation of magnetic weighting agent and magnetic filter sand

[0061] Select the igneous rock-shaped single magnetite raw ore, and the distribution rate of the raw ore magnetite is more than 60%, preferably more than 90%.

[0062] After crushing (crushing ratio 3~4), coarse grinding (rod mill crushing ratio 70~100), ultrafine grinding (stirring mill crushing ratio 9000~10000), screening (6~8 mesh), classification (400 mesh ), magnetic separation (0.04 ~ 0.12mT), reverse flotation (float quartz), filtration (press filtration) and drying (80 ~ 115 ℃) to produce a pure natural and does not contain other harmful trace elements, density close to 5.2, The coercive force is not greater than 0.05 Gauss, and micron (37 ~ 5μm) ferroferric oxide magnetic powder.

[0063] Wherein, in the above-mentioned sieving step, the millimeter-scale sand particles (with a particle size of 1 to 3 mm) sieved through the 6-mesh and 8-mesh sieves are used as sand for fine filtration, that ...

Embodiment 1

[0076] Raw water sample turbidity reduction test with 100 turbidity: the test instrument is ZR4-6 coagulation test mixer; the test container is 1000mL.

[0077] Add polyaluminium chloride and magnetic weighting agent to the raw water sample with 100 turbidity to test the sedimentation effect. The addition amount of polyaluminum chloride is 0.03g / L (ie 30mg / L); the addition amount of magnetic weighting agent is respectively: 0g / L, 0.1g / L, 0.2, 0.5, 1.0 and 1.5g / L.

[0078] Samples were taken at 5, 10, 15, and 20 minutes of settling time, and the turbidity test was carried out; the experimental results are shown in Figure 4 .

Embodiment 2

[0080] Raw water sample turbidity reduction test with 80 turbidity: the test instrument is ZR4-6 coagulation test mixer; the test container is 1000mL.

[0081] Add polyaluminium chloride and magnetic weighting agent to the raw water sample with 80 turbidity to test the sedimentation effect. The addition amount of polyaluminum chloride is 0.025g / L; the addition amount of magnetic weighting agent is respectively: 0g / L, 0.1g / L, 0.2g / L, 0.5g / L, 1.0g / L and 1.5g / L.

[0082] At the settling time: 5, 10, 15 and 20 minutes, samples were taken for turbidity test; the experimental results are shown in Figure 5 .

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Abstract

The invention relates to a method for producing tap water by using a magnetic weighting agent coagulation magnetic separation technology, which comprises the following steps: adding a coagulant and amagnetic weighting agent into raw water to be treated for coagulation to obtain a coagulum, wherein the magnetic weighting agent is magnetic powder coated with polydopamine; carrying out solid-liquidmagnetic separation on the coagulum to obtain a precipitate and a clear liquid; carrying out solid-solid magnetic separation on the precipitate, and recycling to obtain a magnetic weighting agent; andcarrying out refined filtration and disinfection on the clarified liquid to obtain tap water. According to the method for producing tap water, a new magnetic loading coagulation magnetic separation technology is utilized, and the magnetic powder coated with polydopamine is further adopted as a magnetic weighting agent, so that the turbidity reduction efficiency of raw water production is greatlyimproved, the effluent quality is further ensured, the tap water production efficiency is improved, and the production cost is reduced. The magnetic weighting agent is added to produce tap water, so that the dosage of the coagulant is not additionally increased, secondary pollution to finished water is avoided, and the environmental problem is also avoided.

Description

technical field [0001] The invention relates to the technical field of tap water, in particular to a method for producing tap water by using a magnetic weighting agent coagulation magnetic separation technology. Background technique [0002] At present, in the production process of tap water supplied by cities and towns, the raw water is mainly realized through the four major processes of coagulation, sedimentation, filtration and disinfection. Coagulation operation: adding polyaluminum chloride, polyaluminum ferric chloride, ferrous sulfate and other coagulants; mechanical stirring or gasification mixing; surface charge neutralization between coagulants and suspended solids, colloids and dissolved substances in raw water Or adsorption reaction to produce alum flowers of different sizes. Sedimentation operation: With the help of its own specific gravity greater than 1, the alum flower is free to settle in the sedimentation tank by gravity. Filtration operation: The clear w...

Claims

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Application Information

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IPC IPC(8): C02F9/12C02F1/48C02F1/52
CPCC02F9/00C02F1/488C02F1/001C02F2303/04C02F1/76
Inventor 刘山新胡轶波曾亮何梦娟柳衡琪
Owner HNAC TECH
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