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Method for treating high-concentration difficulty-degradable alkaline waste liquid by using iron carbon activated persulfate

A technology for activating persulfate and persulfate, applied in the field of organic pollutants, can solve the problems of persistent, efficient and rapid removal of unfavorable COD, short service life of catalysts, and high processing costs, and achieves the benefits of efficient processing and saving acid addition. The effect of neutralizing and good degradation effect

Inactive Publication Date: 2018-05-22
SUZHOU UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Compared with the large external energy required by the photocatalytic method and the complexity of the heating system of the thermocatalytic method, the use of transition metal ions as catalysts has a good effect on degrading pollutants, but some metal ions will cause secondary pollution to the environment. Ions (Fe 2+ ) reacts with persulfate to generate SO 4 - Although the efficiency is faster, it reduces the SO 4 - The utilization rate of the catalyst is short, the utilization rate is low, the treatment cost is high, and the time is long, which is not conducive to the long-lasting, efficient and rapid removal of COD in wastewater

Method used

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  • Method for treating high-concentration difficulty-degradable alkaline waste liquid by using iron carbon activated persulfate
  • Method for treating high-concentration difficulty-degradable alkaline waste liquid by using iron carbon activated persulfate
  • Method for treating high-concentration difficulty-degradable alkaline waste liquid by using iron carbon activated persulfate

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Take solid sodium persulfate (2.2g) and add it to 100ml of high-concentration organic industrial wastewater with pH = 10.5, add ① 0.47g of micron zero-valent iron (that is, micron-level zero-valent iron), ② 0.12g of C powder, and ③ micron zero-valent iron Valence iron 0.47g and C powder 0.12g. Put it in a water bath shaker and shake it at 200 r / min at room temperature for 3 hours to complete the removal of COD in high-concentration organic industrial wastewater by using persulfate solution. like figure 1 Shown: In the case of only adding C powder, the degradation rate of COD in wastewater within 3 hours is 76.2%; in the case of only adding micron zero-valent iron powder, the degradation rate of COD in wastewater is close to 70.7% in 3 hours %; when C powder and micron zero-valent iron are added, the degradation rate of COD in wastewater exceeds 86.4% within 3 hours, which well illustrates that activated carbon powder and zero-valent iron can play a significant role in ...

Embodiment 2

[0035] Add 2.2g of sodium persulfate, 0.47g of micron zero-valent iron, and 0.06g, 0.09g, 0.12g and 0.16g of C powder into 100ml of high-concentration organic industrial wastewater with pH=10.5, and place them in a water bath shaker. 200r / min room temperature shaking reaction for 3h, that is to complete the removal of COD by using persulfate solution and micron zero-valent iron with different specific gravity and activated carbon powder. Such as figure 2 As shown, the removal rates of COD in this example reached 59.25%, 61.6%, 86.4%, and 60.8%, respectively, indicating that the effect is the best when the ratio of zero-valent iron to activated carbon is about 4:1.

Embodiment 3

[0037] Take 2.2g sodium persulfate, take 0.24g micron zero-valent iron and 0.06g carbon powder, 0.35g micron zero-valent iron and 0.09g carbon powder, 0.47g micron zero-valent iron and 0.12g carbon powder, 0.94g micron zero-valent iron and 0.24g of carbon powder, 1.88g of micron zero-valent iron and 0.47g of carbon powder were added to 100ml of high-concentration organic industrial wastewater with a pH of 10.5, placed in a water-bath oscillator and shaken for 3 hours at room temperature at 200r / min. That is, the removal of COD by using persulfate solution and different micron zero-valent iron and carbon powder dosage under the same iron-to-carbon ratio is completed. Such as image 3 As shown, the removal rate of COD in this example reaches 57.5%, 65.5%, 86.4%, 74.4%, 76.2%, respectively, indicating that the optimal dosage of zero-valent iron and carbon powder is 4.7g / L and 1.2g / L respectively. L.

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Abstract

The invention relates to a method for treating high-concentration difficulty-degradable alkaline waste liquid by using iron carbon activated persulfate. The method comprises the following steps: adding a certain amount of zero-valent iron (Fe0), activated carbon (AC) and persulfate (PS) into high-concentration difficulty-degradable organic matter containing alkaline waste liquid at normal temperature and pressure, uniformly stirring, and reacting for 2-3h under the condition that the initial pH is alkaline to oxidatively degrade contaminants. A synergistic activating oxidant is obtained by adding the zero-valent iron and the activated carbon into the alkaline basic waste liquid, and sulfate and hydroxyl radicals are produced to oxidize the contaminants so as to degrade the alkaline waste liquid; compared with the conventional Fenton oxidation technology, the method has the advantages as follows: the pH application range is wider, the step of adding acid for neutralizing is omitted, removal of the contaminants is facilitated, and the economic cost is reduced; in addition, with the Fe0 and the AC as a catalyst, the efficiency of producing SO4- through activation of PS is significantly improved, so that efficient treatment to the alkaline waste liquid is facilitated better.

Description

technical field [0001] The invention relates to the field of waste liquid treatment, in particular to a method for removing organic pollutants in high-concentration refractory alkaline waste liquid by using iron carbon to activate persulfate. Background technique [0002] Industrial waste liquid usually refers to dangerous goods with environmental hazards. Industrial waste liquid often has high pollutant concentration, complex water quality components, and poor biodegradability, which is an important content in the field of water pollution control. Common industrial waste liquid treatment methods mainly include biological treatment technology, physicochemical treatment technology and advanced oxidation treatment technology. Biological treatment technology generally requires low pollutant concentration, and high concentration treatment efficiency is low, especially alkaline industrial waste liquid, which is extremely biochemical. Low, pretreatment is usually required when en...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/72C02F1/28C02F101/10
CPCC02F1/281C02F1/725C02F2101/101
Inventor 陈家斌黄天寅王骁赵雪瑞史祯琦
Owner SUZHOU UNIV OF SCI & TECH
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