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Pretreatment method for fluorenone production wastewater

A technology for the production of waste water and pretreatment, which is applied in the directions of water/sewage multi-stage treatment, water/sludge/sewage treatment, chemical instruments and methods, etc. It can solve problems affecting treatment work and increase investment costs, and achieve equipment investment savings , Improve biodegradability and protect the ecological environment

Active Publication Date: 2014-05-28
SINOSTEEL ANSHAN RES INST OF THERMO ENERGY CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the use of Fenton's reagent to regenerate the saturated activated carbon has achieved good results, and even in-situ regeneration can be achieved, but in the actual production process, the regeneration reaction will affect the treatment work, or lead to the addition of more equipment to achieve the balance between treatment and regeneration. Continuous, thus increasing investment costs

Method used

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  • Pretreatment method for fluorenone production wastewater

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Take 500L of fluorenone production wastewater, slowly add 92.5% industrial concentrated sulfuric acid to it for acid analysis, until the pH is adjusted to 3, after fully stirring, let it stand for stratification, the oil phase is recovered for production process use, and the water phase after acid analysis is as follows: Add 12.5L of H with a mass concentration of 30% per 500L 2 o 2 and 1kg of FeSO 4 ·7H 2 O, add 7.5kg of activated carbon to it at the same time, turn on the stirring and raise the temperature to 55°C, and take a sample test after timing the reaction for 60 minutes. The COD of the effluent can reach 580mg / L, the COD removal rate can reach 98.9%, and the B / C value increases from 0.2 to 0.55. After the effluent is subjected to SBR biochemical treatment, the final effluent COD can reach 45mg / L, which is better than the first-level discharge standard in the "Integrated Wastewater Discharge Standard" (GB8978-1996).

Embodiment 2

[0022] Take 500L of fluorenone production wastewater, slowly add 92.5% industrial concentrated sulfuric acid to it for acid analysis, until the pH is adjusted to 2, after fully stirring, let it stand for stratification, the oil phase is recovered and used in the production process, and the water phase is used after acid analysis. Add 25L of 30% H for every 500L 2 o 2 and 1.5kg of FeSO 4 ·7H 2 O, add 15kg of activated carbon to it at the same time, start the stirring and raise the temperature to 45°C, take a sample test after timing the reaction for 30 minutes, the COD of the effluent can reach 848mg / L, the COD removal rate can reach 98.5%, and the B / C value increases from 0.2 to 0.46. After the effluent is treated with SBR biochemical treatment, the final effluent COD can reach 65mg / L, which is better than the first-level discharge standard in the "Integrated Wastewater Discharge Standard" (GB8978-1996).

Embodiment 3

[0024] Take 500L of fluorenone production wastewater, slowly add 98% industrial concentrated sulfuric acid to it for acid analysis, until the pH is adjusted to 1, after fully stirring, let it stand for stratification, and the oil phase is recovered for use in the production process. After acid analysis, the water phase is Add 30L of 30% H for every 500L 2 o 2 and 2.5kg of FeSO 4 ·7H 2 O, add 15kg of activated carbon to it at the same time, turn on the stirring and raise the temperature to 35°C, take a sample test after timing the reaction for 120min, the effluent COD can reach 752mg / L, the COD removal rate can reach 98.6%, and the B / C value increases from 0.2 to 0.4. After the effluent is subjected to SBR biochemical treatment, the final effluent COD can reach 73mg / L, which is better than the first-level discharge standard in the "Integrated Wastewater Discharge Standard" (GB8978-1996).

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Abstract

The invention belongs to the technical field of treatment of wastewater from the chemical industry and particularly relates to a pretreatment method for fluorenone production wastewater. The pretreatment method is characterized by comprising the two steps of acidification and oxidation by activated carbon and Fenton's reagent. Specially, the pretreatment method comprises the following steps: (1) acidification: adding industrial sulfuric acid to the fluorenone production wastewater to adjust the pH to 1-3, stirring, and standing for layering; (2) oxidation by activated carbon and Fenton's reagent: simultaneously adding H2O2, FeSO4.7H2O and activated carbon to the wastewater subject to acidification, and conducting reactions under the condition of 35-55 DEG C for 30-120 min. Adsorption, oxidation and regeneration of activated carbon all occur in the step (2). Compared with the prior art, the pretreatment method has the benefits as follows: the pollutant removal efficiency for the fluorenone production wastewater is high; the COD removal rate can reach more than 97%; the biodegradability of the wastewater is significantly improved; the B / C is increased to more than 0.4 from less than 0.2. Therefore, the pretreatment method is of great significance for the sustainable development of fluorenone production enterprises and other chemical production enterprises.

Description

technical field [0001] The invention belongs to the technical field of high-concentration and refractory chemical wastewater treatment, and in particular relates to a pretreatment method for fluorenone production wastewater. Background technique [0002] As an important chemical raw material, fluorenone can be used to synthesize anticancer drugs, sympathetic nerve inhibitors and antispasmodics in the pharmaceutical industry; it can be used to synthesize herbicides and insecticides in agriculture; it can be used to synthesize aromatics in the dye industry. Diamine dyes; used to make photosensitive materials in the electrostatic copying industry; in the plastics industry, fluorenone can be used to synthesize bisphenol products and prepare functional polymer materials. At present, every ton of fluorenone produced produces about lm3 waste water, and the main component of waste water is organic solvent. The high-concentration and refractory chemical wastewater produced in the pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04
Inventor 安路阳王守凯王钟欧王春旭孟庆锐
Owner SINOSTEEL ANSHAN RES INST OF THERMO ENERGY CO LTD
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