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Method for treating heavy metal wastewater

A technology of heavy metals and heavy metal ions, applied in water/sewage treatment, chemical instruments and methods, neutralized water/sewage treatment, etc., can solve the problems of high water content, limited adsorption capacity, difficulty, etc., and achieve the effect of increasing specific surface area

Active Publication Date: 2015-12-02
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the common problem is that the sedimentation particles are small and require a sedimentation tank. The new fine particles are difficult to completely separate from the water, the water treatment effect is unstable, and the sedimentation sludge is a hazardous waste. The sludge volume is large and the water content is high. difficulty
The impact of these mineral materials or modified products on Cd in wastewater 2+ , Pb 2+ , Hg 2+ 、Cu 2+ etc. have strong adsorption, but the adsorption capacity is limited, the content of heavy metals in solids after treatment is only 1-5%, which cannot meet the requirements of resource utilization, and heavy metals are unstable in waste, and they are easy to dissolve and cause secondary pollution. Hazardous waste, the cost of reprocessing solid waste containing heavy metals is high and difficult

Method used

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  • Method for treating heavy metal wastewater
  • Method for treating heavy metal wastewater

Examples

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Embodiment 1

[0025] This embodiment prepares Pb-containing 2+ , Zn 2+ , Mn 2+ , Fe 2+ Each 5mg / L of heavy metal wastewater, adjust the pH value of the wastewater to 4.5-5, as a simulated heavy metal wastewater, according to the following steps:

[0026] a, select the clayey dolomite composed of nano mineral attapulgite-dolomite, the content of dolomite is 60%, the content of attapulgite and opal is 40%;

[0027] b. Clay dolomite is crushed and sieved to obtain clay dolomite particles of 0.5 to 1 mm;

[0028] c. Pack the clayey dolomite particles into a filter column with a diameter of 20mm and an effective height of 500mm;

[0029] d. Filtrate simulated heavy metal wastewater with a hydraulic retention time of 1h, and take water samples twice a week to detect Pb in the water 2+ , Zn 2+ , Mn 2+ , Fe 2+ Concentration, which lasted 110 days, the test results showed that Pb 2+ 2+ 2+ 2+ <0.1mg / L, the pH value of the effluent and the concentration of heavy metal ions meet the discharge ...

Embodiment 2

[0032] This example prepares Cu-containing 2+ 50mg / L heavy metal wastewater, adjust the pH value of the wastewater to 4.5-5, as a simulated heavy metal wastewater, and process it according to the following steps:

[0033] a, select the clayey dolomite composed of nano mineral attapulgite-dolomite, the content of dolomite is 65%, the content of attapulgite and opal is 35%;

[0034] b. Crushing and sieving the clayey dolomite to obtain clayey dolomite particles of 0.5 to 1 mm; taking part of the clayey dolomite and calcining at 900° C. for 120 minutes to obtain calcined clayey dolomite particles;

[0035] C, packing clayey dolomite particles and calcined clayey dolomite particles into a filter column with a diameter of 20mm and an effective height of 500mm according to a mass ratio of 2:1;

[0036]d. The simulated heavy metal wastewater was filtered and treated with a hydraulic retention time of 10 minutes, and Cu was detected by atomic absorption spectrophotometry. 2+ , pH, t...

Embodiment 3

[0039] The present embodiment gets heavy metal-containing acidic water from a porphyrite iron ore acid reservoir as simulated heavy metal wastewater, which contains 47 mg / L of copper and a pH value of 2.8, and is processed according to the following steps:

[0040] a, select the clayey dolomite composed of nano mineral attapulgite-dolomite, the content of dolomite is 55%, the content of attapulgite and opal is 45%;

[0041] b. Clay dolomite is crushed and sieved to obtain clay dolomite particles of 0.5 to 2 mm in size, and calcined at 600° C. for 120 minutes to obtain calcined clay dolomite particles;

[0042] c, the calcined clay dolomite particles are loaded into a filter column with a diameter of 20mm and an effective height of 500mm;

[0043] d. Treat simulated heavy metal wastewater with a filtration rate of 1 h, in which the calcined clay dolomite particles slowly hydrate to release hydroxyl groups, increase the pH value of the water to between 8 and 9, and the concentra...

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Abstract

The invention discloses a method for treating heavy metal wastewater. The method is characterized in that argillaceous dolomite ore is crushed and screened to obtain 0.5-2 mm particulate matter, a filter chamber or a filter column is filled with the particulate matter and / or a high-temperature calcination product thereof, and the heavy metal wastewater is treated in a filtered mode. As argillaceous dolomite is composed of nanometer mineral attapulgite and dolomite and has a natural nanometer porous structure characteristic, a water-mineral interface reaction occurs in particles, the nanometer dolomite induces heavy metal hydrolysis to form hydroxide or subcarbonate precipitation, the nanometer rodlike attapulgite has adsorption and condensation effects on the hydrolyzed colloidal particles, and the pH value and the heavy metal content of the treated wastewater reach the emission standard; heavy metal waste obtained after treatment can be used for metal recovery, or be converted into stable silicate by means of thermotechnical treatment at the temperature of 500 DEG C-700 DEG C.

Description

technical field [0001] The invention belongs to the technical field of wastewater treatment and utilization of non-metallic mineral resources, and relates to water treatment materials and methods. Background technique [0002] There are tens of billions of cubic meters of wastewater containing heavy metals in my country every year, including wastewater from mining, smelting, electrolysis, electroplating, pesticides, medicine, paint, chemicals, pigments and other industries. The river and lake flow sediments caused by the discharge of heavy metal wastewater, especially the soil polluted by heavy metals, not only destroy the ecological environment, but also can be enriched into the human body through the food chain, which has become an enemy that threatens human health. [0003] At present, the treatment methods of heavy metal wastewater at home and abroad can be divided into two categories: one is to convert the dissolved heavy metal ions in the wastewater into insoluble heav...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/66C02F1/52C02F1/62C02F1/64
Inventor 谢巧勤陈天虎邱高谢晶晶朱宇珂李宏伟田漪兮
Owner HEFEI UNIV OF TECH
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