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Method for treating wastewater in DNS acid reduction section

A treatment method and technology for wastewater, applied in water/sewage treatment, natural water treatment, neutralized water/sewage treatment, etc., can solve problems such as difficulty in obtaining ideal results, and achieve the effect of improving resource utilization and COD

Pending Publication Date: 2021-11-05
北京盖雅环境科技有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] It is difficult to obtain the desired effect by using conventional industrial wastewater treatment technology to treat the double wastewater in the reduction section

Method used

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  • Method for treating wastewater in DNS acid reduction section
  • Method for treating wastewater in DNS acid reduction section
  • Method for treating wastewater in DNS acid reduction section

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0065] Metabis waste water produced in the reduction section of a DSD acid production enterprise in Henan, of which COD 44000mg / L, salt content 9.6wt% (ammonium salt is the main component), sodium 2,4-diaminobenzenesulfonate (referred to as metabis) The content is 4500mg / L, and the acid content is 27wt% (sulfuric acid is the main component).

[0066] To 2L of wastewater, add 6mL of 10wt% PAC solution, stir at 400rpm for 10min, add 15mL of 1.5wt‰ anionic PAM (weight average molecular weight 8 million), stir rapidly at 700rpm for 30s, stop stirring, let stand for 30min, settle, and filter. Take 1L of pretreated wastewater and control the temperature at 10°C, slowly add 10wt% NaNO dropwise at 3mL / min 2 50 g of the solution (pH=4) was stirred at 400 rpm for 1 h, and the end point of the diazotization reaction was detected with starch potassium iodide test paper. Then add an equal volume of 1L of the remaining pretreated waste water, raise the temperature to 20°C, perform the coup...

Embodiment 2

[0072]Meta-bis wastewater produced by a DSD acid production enterprise, in which: COD 20000mg / L, salt content 8.7wt% (ammonium salt is the main component), 2,4-diaminobenzenesulfonate sodium (meta-bis) content 3200mg / L , acid content 22wt% (sulfuric acid is the main component).

[0073] To 2L of wastewater, add 6mL of 5wt% PFC solution, stir at 400rpm for 10min, add 20mL of 1.0wt‰ anionic PAM (weight average molecular weight 10 million), stir rapidly at 750rpm for 30s, stop stirring, let stand for 30min, settle, and filter. Take 1L of pretreated wastewater and control the temperature at 5°C, slowly add 10wt% KNO dropwise at 4mL / min 2 25 g of the solution (pH=4) was stirred at 450 rpm for 1.5 h, and the end point of the diazotization reaction was detected with starch potassium iodide test paper. Then add an equal volume of 1L of pretreated waste water, raise the temperature to 25°C, and perform the coupling reaction for 1.5h. Adjust the coupling reaction system to pH=7 with 28...

Embodiment 3

[0076] Meta-bis wastewater produced by a DSD acid production enterprise in Shaanxi: among them, COD 52000mg / L, salt content 11.2wt% (ammonium salt is the main component), 2,4-diaminobenzenesulfonate sodium (meta-bis) content 3200mg / L L, acid content 30wt% (sulfuric acid is the main component).

[0077] Add 10mL of 10wt% starch flocculant solution to 2L of wastewater, stir at 400rpm for 20min, add 15mL of 1.5wt‰ anionic PAM (weight average molecular weight: 10 million), stir rapidly at 850rpm for 30s, stop stirring, let stand for 30min, settle, and filter. Take 1L of pretreated wastewater and control the temperature at 5°C, slowly add 15wt% Ca(NO 2 ) 2 25 g of the solution (pH=4) was stirred at 400 rpm for 2.0 h, and the end point of the diazotization reaction was detected with starch potassium iodide test paper. Then add an equal volume of 1L of the remaining pretreated waste water, raise the temperature to 27°C, and perform the coupling reaction for 1.5h, adjust the couplin...

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Abstract

The invention belongs to the technical field of sewage treatment, and provides a method for treating wastewater in a DNS acid reduction section. The main flocculant can gather particles (or suspended solids) in wastewater in the DNS acid reduction section to form macromolecular flocculent precipitates, and the auxiliary flocculant is used as an auxiliary to promote the formation of the flocculent precipitates, so that the purpose of removing the particles or suspended solids is achieved. The diazo reaction and the coupling reaction can convert water-soluble m-bis compounds in the wastewater of the DNS acid reduction section into water-insoluble azo compounds so that the purpose of removing the water-soluble m-bis compounds is achieved; meanwhile, the finally generated azo compound insoluble in water can be recycled,and thus the resource utilization rate is increased. In addition, the treatment method obviously improves COD in the wastewater.

Description

technical field [0001] The invention relates to the technical field of sewage treatment, in particular to a treatment method for wastewater in a DNS acid reduction workshop. Background technique [0002] The synthesis of 4,4-diaminostilbene-2,2-disulfonic acid (DSD) includes sulfonation, oxidative condensation and reduction, specifically, p-nitrotoluene (PNT) is obtained through oleum sulfonation reaction. Nitrotoluene o-sulfonic acid (NTS); under alkaline conditions, NTS is catalyzed by air / tributyl ester / manganese sulfate, and oxidative condensation occurs to obtain 4-4'-dinitrostilbene-2-2'-disulfone Acid (DNS); DNS is catalytically hydrogenated (reduced) by iron powder to obtain 4,4-diaminostilbene-2,2-disulfonic acid (DSD acid). The specific process is as follows (tributyl ester is not marked in the oxidation condensation section): [0003] [0004] The nitro reduction usually adopts the classic Bechamp nitroaromatic reduction method, which is reduced to the corres...

Claims

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Application Information

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IPC IPC(8): C02F9/04C07C303/32C07C309/46C01C1/24C02F103/36
CPCC02F9/00C07C303/32C01C1/24C02F2103/36C02F1/56C02F1/5236C02F1/66C02F1/001C01P2002/72C07C309/46
Inventor 陈海川韩振国李志良季维志张元凯黄晶晶付东康
Owner 北京盖雅环境科技有限公司
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