Magnetic coagulation water treatment method for in-situ magnetic seed separation and reuse

A magnetic coagulation and water treatment technology, applied in the fields of magnetic field/electric field water/sewage treatment, water/sewage treatment, neutralized water/sewage treatment, etc. , to achieve the effect of improving sewage treatment efficiency, reducing chemical consumption and operating energy consumption.

Active Publication Date: 2022-03-15
NANJING UNIV OF INFORMATION SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above-mentioned magnetic coagulation and magnetic seed recovery methods have problems such as long process flow, complicated equipment, high energy consumption in operation, and poor practicability, which affect the actual popularization and use of the process.

Method used

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  • Magnetic coagulation water treatment method for in-situ magnetic seed separation and reuse
  • Magnetic coagulation water treatment method for in-situ magnetic seed separation and reuse
  • Magnetic coagulation water treatment method for in-situ magnetic seed separation and reuse

Examples

Experimental program
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Effect test

Embodiment 1

[0031] Such as figure 1 As shown, this embodiment provides a magnetic coagulation water treatment method for in-situ magnetic seed separation and reuse, using a reaction pool for water treatment, and a mixer 2 for stirring is installed in the reaction pool; the reaction pool includes a reaction cylinder 14 connected up and down And the mud hopper 15, the reaction cylinder 14 is a cylindrical or prismatic cylinder, which is convenient for flocculation and settlement, and the mud hopper 15 is conical or truncated, which is convenient for sludge collection and concentration. The reaction cylinder 14 is connected with a medicine box 3, and the medicine box 3 includes a magnetic seed box 301, a coagulant box 302, a coagulant box 303 and an acid-base regulator respectively filled with a magnetic seed, a coagulant, a coagulant and an acid-base regulator. Alkali conditioner tank 304. The mud hopper 15 is provided with a pH meter 7 for monitoring the pH value and a sludge concentratio...

Embodiment 2

[0048] Adopt the method in the embodiment 1 to process the surface water of a certain mild black and odorous river, the main operating parameters and process are:

[0049] Magnetic coagulation treatment stage: adjust the pH to 7.0; the magnetic seed, coagulant and coagulant aid are 500 mesh ferric oxide magnetic powder, polyaluminum chloride and polyacrylamide respectively; the concentration of the three in the magnetic coagulation reaction system 150mg / L, 50mg / L and 0.1mg / L respectively; fast, medium and slow stirring speeds are 500r / min, 150r / min and 80r / min respectively; fast stirring, medium stirring, slow stirring and static settling time respectively 0.5min, 2min, 5min and 3min; set the drainage volume after static settling to 80% of the volume of the reaction tank, the sludge concentration threshold in the mud hopper is 6000mg / L, and the magnetic coagulation treatment step runs continuously for 10 rounds and then enters the magnetic seed separation and recovery stage. ...

Embodiment 3

[0056] Using the method in Example 1 to treat the biochemical secondary effluent of an urban sewage treatment plant, the main operating parameters and process are:

[0057] Magnetic coagulation treatment stage: adjust the pH to 7.2; the magnetic seed, coagulant and coagulant aid are 500 mesh ferric oxide magnetic powder, polyaluminum chloride and polyacrylamide respectively; the concentration of the three in the magnetic coagulation reaction system 200mg / L, 80mg / L and 0.2mg / L respectively; fast, medium and slow stirring speeds are 500r / min, 150r / min and 80r / min respectively; fast stirring, medium stirring, slow stirring and static settling time respectively 1min, 3min, 8min and 5min; set the drainage volume after static settling to 80% of the reaction tank volume, the sludge concentration threshold in the mud hopper is 4500mg / L, and the magnetic coagulation treatment step will enter the magnetic seed separation and recovery stage after 6 rounds of continuous operation .

[00...

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Abstract

The invention discloses a magnetic coagulation water treatment method for in-situ magnetic seed separation and reuse. The method adopts a reaction tank to carry out the following steps: injecting sewage into the reaction tank, and adding magnetic seeds, a coagulant and a coagulant aid to carry out magnetic coagulation treatment; after the magnetic coagulation treatment is finished, starting an electromagnet at the bottom of a sludge bucket, discharging treated sewage after static settling, and then detecting the concentration of sludge in the sludge bucket; if the sludge concentration is smaller than the set threshold value, the steps are repeated, the sewage is injected again for magnetic coagulation treatment, and magnetic seeds do not need to be added in the treatment process; and if the sludge concentration is greater than or equal to a set threshold value, carrying out in-situ magnetic seed separation and recovery through pH value adjustment, deflocculation, magnetic mud separation and mud discharge, then repeating the previous steps, injecting the sewage again for magnetic coagulation treatment, and synchronously supplementing magnetic seeds in the treatment process according to the loss amount during magnetic seed recovery. The magnetic coagulation water treatment method for in-situ magnetic seed separation and reuse provided by the invention is short in process flow, high in sewage treatment efficiency, simple in equipment and low in operation cost.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment, and in particular relates to a magnetic coagulation water treatment method for in-situ magnetic seed separation and reuse. Background technique [0002] Magnetic coagulation process is a new technology emerging in the field of water treatment that has attracted much attention. It combines magnetic separation technology with conventional flocculation technology, adds magnetic seeds during the flocculation process, and utilizes the dual effects of coagulant and magnetic seeds to form high-density magnetic flocs from insoluble colloids and suspended substances in water, and then utilizes its own gravity to form high-density magnetic flocs. Or apply an external magnetic field to achieve high-speed precipitation and separation of flocs. In recent years, magnetic coagulation technology has been more and more widely used in water treatment scenarios that require high load and rapid emergency r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/48C02F1/66
CPCC02F1/488C02F1/66
Inventor 方华陈兵奇赵金宇王梦伟吴迎新
Owner NANJING UNIV OF INFORMATION SCI & TECH
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