Unlock instant, AI-driven research and patent intelligence for your innovation.

A treatment method for hazardous waste acid

A treatment method and a treatment liquid technology, applied in chemical instruments and methods, oxidized water/sewage treatment, special compound water treatment, etc., can solve problems such as environmental pollution and complex components

Active Publication Date: 2022-04-01
山东济清科技服务有限公司
View PDF0 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The hazardous waste acid involved in the present invention contains about 25-32% hydrochloric acid, 5-10% titanium dioxide (TiO 2 ), 6-10% titanium tetrachloride (TiCl 4 ), 5-12% alcohols, 4-8% alkanes and other organic substances and a small amount of inorganic substances such as sodium sulfate and magnesium chloride, about 23% water, pH=(-2)-3, conductivity greater than or equal to 100000μs / cm, CODcr is 60000-70000mg / L, non-toxic, no heavy metals, but the composition is complex, if discharged without effective treatment, it will cause serious pollution to the environment
[0003] Most of the existing treatment methods for the above-mentioned hazardous waste acid are directly neutralized with alkali, and then discharged; or use the above-mentioned hazardous waste acid to neutralize the spent alkali produced by some chlor-alkali plants; The organic matter in the waste acid will cause serious pollution to the environment if it is discharged without any treatment.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] A treatment method for hazardous waste acid, comprising the steps of:

[0030] (1) Add Ca(OH) to the above-mentioned hazardous waste acid of 1000mL 2 Adjust the pH to 6, then obtain the filtrate and solid TiO by flocculation filtration 2 . Add 2g FeSO to the filtrate 4 and 10 mL of 30% hydrogen peroxide at 25° C. for Fenton oxidation treatment for 30 minutes, and filtered to obtain a treatment solution.

[0031] (2) The treated liquid is distilled under reduced pressure (pressure -0.06Mpa, temperature 60°C), the heat is recovered by a heat exchanger to obtain a condensate, and the condensate is obtained by distillation under reduced pressure until no condensate is formed, and a concentrated liquid (mainly containing calcium chloride) is obtained at the same time , the concentrated solution can be further processed to obtain salt substances; ozone is pumped into the condensate through a Venturi jet and mixed vigorously for 6 hours (the amount of ozone introduced is 10...

Embodiment 2

[0034] A treatment method for hazardous waste acid, comprising the steps of:

[0035] (1) Add Mg(OH) to the above-mentioned hazardous waste acid of 1000mL 2 Adjust the pH to 6, then obtain the filtrate and solid TiO by flocculation filtration 2 . Add 3g FeSO to the filtrate 4 and 10 mL of 30% hydrogen peroxide at 30° C. for Fenton oxidation treatment for 30 minutes, and filtered to obtain a treatment solution.

[0036] (2) The treatment liquid is vacuum spray-dried (vacuum degree -0.09Mpa), and the heat is recovered by the heat exchanger to obtain the condensate, and the industrial salt MgCl is obtained at the same time 2 (contains a small amount of other salt impurities); ozone is pumped into the condensate through a Venturi jet and mixed vigorously for 6 hours (the amount of ozone introduced is 10g / L, that is, 10g of ozone is introduced per liter of condensate), and it must be treated with ozone Then add powdered activated carbon (the addition of activated carbon is 30kg...

Embodiment 3

[0039] A treatment method for hazardous waste acid, comprising the steps of:

[0040] (1) Add Mg(OH) to the above-mentioned hazardous waste acid of 1000mL 2 Adjust the pH to 6, then obtain the filtrate and solid TiO by flocculation filtration 2 . Add 3g FeSO to the filtrate 4 and 15 mL of 30% hydrogen peroxide at 20° C. for Fenton oxidation treatment for 40 minutes, and filtered to obtain a treatment solution.

[0041] (2) The treatment liquid is vacuum spray-dried (pressure-0.05Mpa), and the heat is recovered by the heat exchanger to obtain the condensate, and the industrial salt MgCl is obtained at the same time 2 (contains a small amount of other salt impurities); pass the condensate into the micro-electrolysis cell, add carbon-aluminum electrodes, control the voltage at 4-6v, and perform micro-electrolysis treatment. The residence time of the condensate is 8h, and it is filtered to obtain micro-electrolysis treatment Then add powdered activated carbon (the addition of ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
particle diameteraaaaaaaaaa
Login to View More

Abstract

The invention provides a treatment method of hazardous waste acid, which comprises the steps of: adding alkali to the hazardous waste acid to adjust the pH to 5-7, then flocculating and filtering, and adding FeSO 4 Carry out Fenton oxidation treatment with hydrogen peroxide to obtain a treatment solution; the treatment solution is subjected to vacuum distillation or vacuum spray drying, and then the heat is recovered through a heat exchanger to obtain a condensate; the obtained condensate is subjected to ozone treatment or micro-electrolysis treatment, activated carbon treatment, and security filtration , After reverse osmosis treatment, discharge up to standard. The treatment method of the invention can not only realize the standard discharge of hazardous chemical waste acid, but also obtain product salt through further treatment, and comprehensively utilize the hazardous chemical waste acid, turning waste into treasure. After being treated by the method of the present invention, the water quality of waste acid can reach: CODcr is reduced to 100 mg / L or below, chroma is reduced to 1 or below, the salt content is trace, and its main component content is water, which can effectively achieve standard discharge.

Description

technical field [0001] The invention relates to a treatment method for hazardous waste acid, which belongs to the technical field of waste acid treatment. Background technique [0002] The category of hazardous waste acid belongs to HW34 900-349-34, which refers to: invalid, deteriorated, unqualified, eliminated, fake and inferior strong acid scrubbing powder, cleaning agent, stain remover and others produced in the process of production, sales and use Waste acid liquid and acid residue. The hazardous waste acid involved in the present invention contains about 25-32% hydrochloric acid, 5-10% titanium dioxide (TiO 2 ), 6-10% titanium tetrachloride (TiCl 4 ), 5-12% alcohols, 4-8% alkanes and other organic substances and a small amount of inorganic substances such as sodium sulfate and magnesium chloride, about 23% water, pH=(-2)-3, conductivity greater than or equal to 100000μs / cm, CODcr is 60000-70000mg / L, non-toxic, no heavy metals, but the composition is complex, if dis...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/06C02F101/30C02F101/16
CPCC02F9/00C02F1/66C02F1/725C02F1/001C02F1/04C02F1/12C02F1/78C02F1/46109C02F2001/46133C02F1/281C02F1/441C02F1/52C02F2101/16C02F2101/30C02F2305/026
Inventor 王正顺王源姜在勇
Owner 山东济清科技服务有限公司