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Process flow for deep treatment of desulfurization wastewater

A technology for desulfurization wastewater and process flow, applied in filtration treatment, multi-stage water treatment, water/sewage treatment, etc., can solve the problems of dust pollution, difficulty, high moisture content in solid-liquid separation

Active Publication Date: 2017-11-10
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the synthesis conditions of LDH are harsh, requiring processes such as solid-liquid separation, washing and drying, and the synthesized LDH particles are small, so the solid-liquid separation has a high moisture content and is difficult, and the drying energy consumption is high, which makes the cost of artificially synthesizing LDH relatively high, which restricts the use of LDH in wastewater. Application in treatment, and it is easy to cause dust pollution when adding ultra-fine powder LDH to wastewater

Method used

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  • Process flow for deep treatment of desulfurization wastewater
  • Process flow for deep treatment of desulfurization wastewater

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Effect test

Embodiment

[0040] The process and steps of the present embodiment are as follows: using NaCl and Na 2 SO 4 Prepare a simulated solution of 0.3M chloride ion and 0.03M sulfate concentration:

[0041] (1) First order reaction: according to n(Ca(OH) 2 ):n(NaAlO 2 ):n(Cl - +SO 4 2- )=5:2:1, add the corresponding mass of calcium source and aluminum source into 100mL simulated solution, stir evenly, isolate the air, place in a 40-degree water bath heating oscillator and shake for 2 hours, and perform solid-liquid separation after uniform reaction. Three parallel experiments were performed, and the quality of the reagents is shown in Table 1.

[0042] After the simulated solution treated by the above method was analyzed for water quality, it was found that the treated simulated solution system Cl - The removal rate reached 77%, SO 4 2- 90.53% was removed and the pH of the solution was above 13.50.

[0043] Control experiment, in same solution system, only add calcium hydroxide of same...

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Abstract

The invention discloses a process flow for deep treatment of desulfurization wastewater. By supplementing divalent metal cations Ca<2+> and trivalent metal cations Al<3+> and adjusting the pH value of the system, the cations and abundant complicated anions in the desulfurization wastewater coprecipitate under certain conditions to form CaAl-LDH or MgAl-LDH or other multi-element layered double hydroxide precipitates, wherein abundant metal ions existing in the wastewater can also serve as configurational ions intercalated into the LDH layered plate, and part of oxyacid radical ions are cooperatively treated through interlayer anion intercalation or LDH surface adsorption action. According to the process flow for deep treatment of desulfurization wastewater, by using the adjustability and diversity of the LDH composition and fully utilizing the intercalation principle of chlorine ions and sulfate radicals in the LDH structure, the LDH can be synthesized immediately in the wastewater treatment process to remove the chlorine ions, so that the defect that the chlorine ions can not be effectively removed in the current triple tank process is compensated for; and the two discrete processes of LDH synthesis and wastewater treatment can be completed in one system, thereby saving the treatment cost.

Description

technical field [0001] The invention relates to the technical field of coal-fired power plant flue gas wet desulfurization wastewater treatment, in particular to a process flow for advanced treatment of desulfurization wastewater for effectively removing chloride ions in the desulfurization wastewater. Background technique [0002] In recent years, my country has vigorously implemented the important strategic policy of combining the total control of air pollutants and the control of emission concentration. The further promulgation of the "Action Plan for Air Pollution Prevention and Control" is a strong performance of the country on air pollution control. December 2, 2015 The State Council of Japan has decided to comprehensively implement ultra-low emission and energy-saving transformation of coal-fired power plants, greatly reduce coal consumption and pollution emissions for power generation, and strive to achieve ultra-low emissions before 2020. Among them, the wet limestone...

Claims

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Application Information

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IPC IPC(8): C02F9/04C02F103/18
CPCC02F1/001C02F1/5236C02F1/5281C02F1/66C02F9/00C02F2103/18C02F2209/001C02F2209/003C02F2301/08
Inventor 张胜寒陈玉强
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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