Treatment method of sintering flue gas desulphurization wastewater

A technology for desulfurization wastewater and sintering flue gas is applied in the field of iron and steel smelting and processing, and can solve the problems of secondary pollution, high cost of wastewater treatment, and no report on the treatment process of sintering flue gas desulfurization wastewater.

Active Publication Date: 2011-03-30
BAOSHAN IRON & STEEL CO LTD
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

This process has the following disadvantages: ①The cost of wastewater treatment is relatively high; ②The escaped free ammonia will cause secondary pollution; ③The water temperature decre

Method used

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  • Treatment method of sintering flue gas desulphurization wastewater
  • Treatment method of sintering flue gas desulphurization wastewater
  • Treatment method of sintering flue gas desulphurization wastewater

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Experimental program
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Effect test

Embodiment 1

[0034] Sintering flue gas desulfurization wastewater contains a large amount of suspended solids and trace amounts of heavy metal ions, and needs to be neutralized, coagulated, and precipitated before entering the biochemical treatment system of coking wastewater. The reaction conditions are: adding calcium hydroxide solution to adjust the pH of desulfurization wastewater to 8.5, adding 10ppm polyacrylamide, and reacting for 30 minutes to precipitate. The water quality of sintering flue gas desulfurization wastewater before and after treatment is shown in Table 1. It can be seen that after neutralization, coagulation, and precipitation treatment, all heavy metal ions have reached the national first-level emission standard, and the removal rate of ammonia nitrogen is very low, only 3.8%.

[0035] Table 1 Neutralization and precipitation effects of sintering flue gas desulfurization wastewater

[0036]

Embodiment 2

[0038]The reaction conditions for neutralization, coagulation, and precipitation are: add calcium hydroxide solution to adjust the pH of desulfurization wastewater to 9, add 30ppm polyferric sulfate and 1ppm polyacrylamide at the same time, react for 30min and then precipitate. The water quality of sintering flue gas desulfurization wastewater is shown in Table 2. It can be seen that after neutralization, coagulation, and precipitation treatment, all heavy metal ions have reached the national first-level emission standard, and the removal rate of ammonia nitrogen is 8.2%.

[0039] Table 2 Neutralization and precipitation effects of sintering flue gas desulfurization wastewater

[0040]

[0041]

Embodiment 3

[0043] The reaction conditions for neutralization, coagulation, and precipitation are: add calcium hydroxide solution to adjust the pH of desulfurization wastewater to 9.5, and add 200ppm of polyferric sulfate at the same time, and precipitate after 30 minutes of reaction. The water quality of sintering flue gas desulfurization wastewater before and after treatment as shown in Table 3. It can be seen that after neutralization, coagulation, and precipitation treatment, all heavy metal ions have reached the national first-level emission standard, and the removal rate of ammonia nitrogen has reached 16%. Table 3 Neutralization and precipitation effects of sintering flue gas desulfurization wastewater

[0044]

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Abstract

The invention discloses a treatment method of sintering flue gas desulphurization wastewater, which completes the treatment on the sintering flue gas desulphurization wastewater through the following five steps of: 1. neutralization and coagulation: regulating the pH value of the sintering flue gas desulphurization wastewater to 8.5 to 9.5 by lye, and adding 0 to 200ppm of coagulating agents; 2. flocculation: adding 0 to 10ppm of coagulant aids for forming flocs; 3. precipitation and filter liquor separation; 4. biochemical treatment on filter liquor; and 5. deep treatment. The treatment method can be used for reducing the treatment cost of the desulphurization wastewater without generating influence on other treatment systems, thereby having good application and popularization prospects.

Description

technical field [0001] The invention belongs to the field of iron and steel smelting and processing, and in particular relates to a treatment method for sintering flue gas desulfurization wastewater. Background technique [0002] The sintering process in my country's iron and steel smelting process is the main source of air pollution, and the proportion of exhaust gas discharged in the entire iron and steel plant is: smoke and dust 17%, SO 2 46%, NO X 20%. The treatment of sintering flue gas has become SO 2 The focus of emission reduction. In recent years, the national environmental protection requirements for sintering machine flue gas emissions have become increasingly stringent: the issued national standards require existing iron and steel enterprises sintering machine SO 2 Emission standard is 600mg / Nm 3 , the 2010 emission standard for sintering machines in new iron and steel enterprises is 100mg / Nm 3 . [0003] According to the requirements of the national envir...

Claims

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Application Information

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IPC IPC(8): C02F9/14C02F1/66C02F1/52C02F3/30C02F1/28C02F1/44C02F103/18
Inventor 侯红娟沈晓林李恩超黎洁陈诗杰
Owner BAOSHAN IRON & STEEL CO LTD
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