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Composite chitosan flocculant for treating desulfurization wastewater, preparation method and application

A technology of desulfurization wastewater and chitosan, which is applied in the direction of water/sewage treatment, chemical instruments and methods, water/sewage multi-stage treatment, etc., can solve the problems that cannot meet the treatment requirements, desulfurization wastewater cannot meet the standard discharge, etc., and achieve faster adsorption Good flocculation effect and strong flocculation ability

Active Publication Date: 2020-02-14
ELECTRIC POWER RESEARCH INSTITUTE OF STATE GRID SHANDONG ELECTRIC POWER COMPANY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, with the continuous deterioration of the current water quality, especially the continuous decline in the quality of supplementary water entering the desulfurization system, the traditional three-box treatment process is increasingly unable to meet the current desulfurization wastewater treatment requirements, making the desulfurization wastewater unable to meet the discharge standards

Method used

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  • Composite chitosan flocculant for treating desulfurization wastewater, preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] 1. Chitosan is dissolved in the acetic acid solution of 1% (volume), after dissolving completely, form the chitosan solution of 2% (mass), the chitosan solution is heated to 80 ℃, in the situation of continuous stirring Next, add 0.5% iron sulfate of chitosan mass and magnesium sulfate of 0.5% chitosan mass in turn, continue to stir for 2 hours, stir evenly, then put it into an oven for drying, dry at 90°C and then grind.

[0052] 2. Take the desulfurization wastewater from Huaneng Jiaxiang Power Plant. The desulfurization wastewater is introduced into the neutralization tank, and lime is added through the lime inlet. Under the condition of continuous stirring, the lime is added until the pH reaches 8.0. After the stirring stops and the lime settles, the wastewater is introduced into the flocculation tank.

[0053] 3. Introduce the wastewater into the flocculation tank, stir the wastewater at a speed of 100rpm, add flocculant according to the mass ratio of 1:10000, cont...

Embodiment 2

[0058] 1. The preparation steps of the flocculant are the same as in Example 1.

[0059] 2. Take the desulfurization wastewater from Huadian Zouxian Power Plant, and the lime treatment process is the same as in Example 1.

[0060] 3. The flocculation treatment process is the same as in Example 1.

[0061] 4. The water quality analysis process is the same as in Example 1.

[0062] The test results are shown in Table 2.

[0063] Table 2

[0064] Project indicators Raw water (ppm) Lime treatment (ppm) Flocculation treatment (ppm) suspended matter 7900 1940 28 Copper ion content 0.229 0.036 not detected Cadmium ion content 0.331 0.117 0.011 Zinc ion content 0.154 0.081 0.020

Embodiment 3

[0066] 1. The preparation steps of the flocculant are the same as in Example 1.

[0067] 2. Take the desulfurization wastewater from Huaneng Huangtai Power Plant, and the lime treatment process is the same as in Example 1.

[0068] 3. The flocculation treatment process is the same as in Example 1.

[0069] 4. The water quality analysis process is the same as in Example 1.

[0070] The test results are shown in Table 3.

[0071] table 3

[0072] Project indicators Raw water (ppm) Lime treatment (ppm) Flocculation treatment (ppm) suspended matter 9300 1770 28 Copper ion content 0.204 0.028 not detected Nickel content 0.177 0.124 0.022 Zinc ion content 0.335 0.177 0.022

[0073] The present invention mainly constructs a desulfurization wastewater upgrading process based on composite chitosan as a flocculant, and realizes the desulfurization wastewater of multiple power plants on the basis of reducing the original chemical do...

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Abstract

The invention discloses a compound chitosan flocculant for treating desulfurization waste water, and a preparation method and application thereof. The method comprises the following steps: adding chitosan into an acetic acid solution and uniformly mixing; adding ferric sulfate and magnesium sulfate under the conditions of stirring and heating; and uniformly mixing and then drying, thereby obtaining the powder, namely, the compound chitosan flocculant, wherein the mass ratio of the added chitosan to ferric sulfate to magnesium sulfate is 100:(0.4-0.6):(0.4-0.6). The flocculant is adopted for replacing an organic sulfur treating process and an iron flocculant treating process in an original triple box, so that the treating efficiency for suspended solids can be increased, the dosage of lime can be reduced, the upgrading and reconstruction for the desulfurization waste water are guaranteed, and the dosage of the drugs is reduced.

Description

technical field [0001] The invention belongs to the field of sewage treatment, relates to the field of flocculation treatment of desulfurization wastewater, in particular to a composite chitosan flocculant for treating desulfurization wastewater, a preparation method and application thereof. Background technique [0002] Desulfurization wastewater is mainly the discharge water from the absorption tower in the process of boiler flue gas wet desulfurization (limestone / gypsum method). In order to maintain the balance of substances in the slurry circulation system of the desulfurization unit, prevent the soluble part of the flue gas, that is, the chlorine concentration from exceeding the specified value, and ensure the quality of gypsum, a certain amount of wastewater must be discharged from the system, namely desulfurization wastewater, which mainly comes from gypsum dehydration and Clean the system. The impurities contained in desulfurization wastewater mainly include suspend...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/52C02F1/56C02F9/04C02F103/18
CPCC02F1/5236C02F1/5263C02F1/56C02F1/66C02F2103/18C02F2101/20
Inventor 吴中杰刘国强许立国张燕侯亚琴高坚李贵海
Owner ELECTRIC POWER RESEARCH INSTITUTE OF STATE GRID SHANDONG ELECTRIC POWER COMPANY
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