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Pretreatment process of chromium-containing wastewater

A chromium wastewater and pretreatment technology, applied in water/sewage treatment, reduced water/sewage treatment, water/sewage multi-stage treatment, etc., can solve the problems affecting the effect and ability of wastewater treatment, large power consumption, iron and carbon loss, etc.

Inactive Publication Date: 2010-08-25
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This is because the surface morphology of the iron has changed after the micro-electrolysis equipment has been in operation for a period of time, and it is covered by the flocs and sediments produced by the micro-electrolysis, which reduces the rate of electrodeposition, coagulation and redox reactions, thereby affecting the The effect and ability of wastewater treatment; although the fluidized bed solves the problem of agglomeration, in order to ensure fluidization, the wastewater needs to be continuously circulated, so the power consumption is large, and iron and carbon loss occur

Method used

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  • Pretreatment process of chromium-containing wastewater
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Examples

Experimental program
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Effect test

Embodiment 1

[0071]Select shot blasting iron powder (0.05-1.5mm) from stainless steel cold rolling enterprises, soak in 10wt% NaOH lye for 30 minutes to degrease, wash until the pH value is neutral, and use 3% HCl acid solution Soak for 30min to remove rust, after activation treatment, mix with coke particles (1-5mm in particle size) according to the ratio of 1:0.1, add 50% porous ceramic medium to form the filter material of the iron filings filter; the iron filings filter adopts One for use and two for standby, each filter adopts the dynamic upstream filtration method of water inflow from the bottom and water outflow from the top; iron powder is stored in shallow pan structures stacked layer by layer. The shallow tray can be added or removed dynamically;

[0072] The aeration intensity of the regulating tank is 0.5m 3 (air) / m 3 (Wastewater) h, the dissolved oxygen content in the effluent of the adjustment pool is 8.0mg / L; the 10m 3 / h of stainless steel cold rolling pickling wastewate...

Embodiment 2

[0079] Select acid-regenerated iron powder (particle size: 0.02-1.0mm) from the semiconductor industry, soak in 15% NaOH alkali solution for 20 minutes to remove oil, wash until the pH value is neutral, and soak in 5% HCl acid solution for 15 minutes For rust removal, after activation treatment, mix with activated carbon particles (particle size: 1-10mm) according to the ratio of 1:0.05, add 40% porous ceramic medium to form the filter material of the iron filings filter; the iron filings filter adopts a In the first preparation, each filter adopts the dynamic upstream filtration method of water inflow from the bottom and water outflow from the top; the iron powder is stored in a shallow pan structure stacked layer by layer. Can be added or removed dynamically;

[0080] The aeration intensity of the regulating tank is 0.1m 3 (air) / m 3 (Wastewater) h, the dissolved oxygen content in the effluent of the adjustment pool is 6.0mg / L; the 15m 3 / h semiconductor industry pickling ...

Embodiment 3

[0087] Two mixtures of acid-regenerated iron powder and shot blasting iron powder (particle size: 0.02-10 mm) from the electroplating industry were selected, soaked in 10% NaOH lye for 30 minutes to remove oil, washed until the pH value was neutral, and washed with 3 % HCl acid solution soaked for 20min to remove rust, after activation treatment, mixed with anthracite particles (1-10mm in particle size) according to the ratio of 1:0.1, and added 50% porous ceramic medium to form the filter material of the iron filings filter; The iron filings filter adopts one use and three preparations, and each filter adopts a dynamic upstream filtration method of water inflow from the bottom and water outflow from the top; The laying thickness is 50mm, and the shallow tray can be dynamically added or removed;

[0088] The aeration intensity of the regulating tank is 0.4m 3 (air) / m 3 (Wastewater) h, the dissolved oxygen content in the effluent of the adjustment pool is 7.5mg / L; the 20m 3 ...

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Abstract

The invention relates to a pretreatment process of chromium-containing wastewater, which comprises the following steps that: 1) scrap iron filter tank is established, iron-containing spare is mixed with carbon-containing particles and porous filler to form a scrap iron filter tank after being washed by alkali so as to remove the oil and being washed by acid to remove the rust and to be activated; 2) chromium-containing wastewater is introduced into the scrap iron filter tank to be undertaken the micro electrolysis reaction after being aerated by an adjusting tank, and pH value and the oxidation reduction potential level ORP value are adjusted by acid liquid, so major hexavalent chrome is reduced to trivalent chromium; 3) the water which is discharged from the filter tank is guided to a reaction tank, neutralizing agent is added, heavy metal complex-precipitation happens, and discharged water is guided into a sedimentation tank; 4) after the majority of heavy metal pollutant inside the sedimentation tank is removed, the upper clean liquid is undertaken the advanced treatment and is discharged after reaching the standard. The pretreatment process not only realizes the resource utilization of waste scrap iron and waste acid liquid, but also greatly reduces the cost of the medicine, reduces the quantity of the following mud, and is easier to realize the resource utilization of the produced mud.

Description

technical field [0001] The invention relates to the technical field of heavy metal wastewater treatment, in particular to a pretreatment process for chromium-containing wastewater. Background technique [0002] In steel, semiconductor, circuit board, electroplating, non-ferrous metallurgy and other industries, dichromate is often used as electroplating solution, so it is inevitable to discharge multiple channels of heavy metal wastewater, especially chromium-containing wastewater. The typical Composed of: Cr 6+ , 200~900mg / L; T.Cr, 300~1200mg / L; Ni 2+ , 200~400mg / L; T.Fe, 300~600mg / L; Cu 2+ , 50~200mg / L; Zn 2+ , 50~200mg / L; Pb 2+ , 20~100mg / L; F - , 400~5000mg / L; SO 4 2- , 1000~10000mg / L; PH value, 1.5~2.5; SS, 1000~5000mg / L and so on. After hexavalent chromium enters the human body, it will accumulate in the liver, kidney, lung, and endocrine glands, causing damage to the vital organs of the human body. Therefore, chromium-containing wastewater must be treated to me...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/06C02F1/461C02F1/70C02F1/62C02F1/52C02F101/22
Inventor 石磊陈荣欢王如意张文志
Owner BAOSHAN IRON & STEEL CO LTD
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