Application of carbonatation steel scoria in wastewater treatment

A technology for carbonating steel slag and wastewater treatment, which is applied in biological water/sewage treatment, water/sludge/sewage treatment, aerobic process treatment, etc., to achieve the effect of reducing emissions, saving equipment costs, and saving pharmaceutical costs

Inactive Publication Date: 2008-09-24
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

So far, there is no report on the use of carbonated steel slag as bio-iron filler for sewage treatment in domestic and foreign patents and non-patent literature

Method used

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  • Application of carbonatation steel scoria in wastewater treatment
  • Application of carbonatation steel scoria in wastewater treatment
  • Application of carbonatation steel scoria in wastewater treatment

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] Table 1 lists the pH values ​​of the water eluate before and after carbonation of converter steel slag.

[0055] Table 1 Comparison of pH value of water eluate before and after carbonation of converter steel slag

[0056] pH value

Embodiment 2

[0058] Metal element determination was carried out on the carbonation converter steel slag aqueous solution, and the results are shown in Table 2.

[0059] Table 2 Dissolution test results of converter steel slag in water after carbonation Unit: μg / L

[0060]

[0061] It can be seen from the data in the table that the concentration of environmentally sensitive metal elements dissolved in the water after carbonation of steel slag is far lower than the first-level discharge standard in the "Comprehensive Wastewater Discharge Standard GB8978-1996", which proves that carbonated steel slag is non-toxic and harmless. It can be used safely in water treatment to achieve resource utilization.

Embodiment 3

[0063] The dissolution law of iron in carbonated steel slag has been studied (see Table 3 for details). The research results show that iron ions in carbonated steel slag have a certain degree of dissolution in water, which is roughly 3-7 mg / L, which can basically meet the microbial growth process. demand for iron.

[0064] Table 3 Dissolution test results of iron in water in carbonated steel slag

[0065] time (d)

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Abstract

The invention provides the application of carbonatation steel slag in the wastewater treatment. Under the condition that the temperature is 350-800 DEG C, the atmospheric pressure is 0.1-3.6, and the content of vapor is 5-25 percent, industrial waste gas or flue gas is led to a converter steel slag carbonatation device, the waste steel slag is carbonated, and then the carbonated steel slag is sieved to grains with the grain diameter being 5-10 mm by a screen grader. The carbonatation processing adopts the flue gas discharged by an iron and steel plant to be used as a carbon dioxide source, so the emission of greenhouse gases is reduced. The carbonated steel slag is used for the wastewater treatment, saves the medicine cost of adding iron salt and the equipment cost, creates a new path for the comprehensive utilization of the steel slag, and realizes the purposes of treating the water by the waste and reusing the sources.

Description

technical field [0001] The invention belongs to the field of environmental protection and resource utilization, and in particular relates to waste water treatment and secondary utilization of steel slag. Background technique [0002] According to the different growth modes of microorganisms, sewage biological treatment processes can be divided into two categories: activated sludge process and biofilm process. Compared with the activated sludge method, the biggest advantage of the biofilm method is that there is no sludge bulking problem; secondly, it is beneficial to the growth of some slow-growing microorganisms (such as nitrifying bacteria). [0003] Filler is the carrier of biofilm and also has the function of intercepting suspended solids. It is the key to biofilm process and directly affects its treatment effect. At the same time, the cost of filler occupies a large proportion in the infrastructure cost of the biofilm treatment system, so the filler is related to the e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/10C02F3/02B09B3/00
CPCY02W10/10
Inventor 董晓丹邵立宪郑炜
Owner BAOSHAN IRON & STEEL CO LTD
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