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Method for removing trace amount of toxic pollutants in water by enzyme-loading magnetic particle reinforced flocculation

A magnetic particle and water removal technology, applied in water pollutants, flocculation/sedimentation water/sewage treatment, chemical instruments and methods, etc., can solve problems such as high cost, non-recyclable free biomimetic enzymes, and large footprint , to achieve the effect of high reaction rate, low reaction cost and high reaction intensity

Active Publication Date: 2014-04-09
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

CN102863103A proposes a technology for advanced treatment of papermaking pulping wastewater using advanced ferritase oxidation + flocculation sedimentation technology, which adds free ferritase (bionic enzyme) and hydrogen peroxide to catalyze the oxidation reaction, and then uses polyacrylamide for flocculation reaction , can better remove high-concentration lignin and chlorophenols, but its imitation enzyme-catalyzed oxidation and flocculation process is a combined process of two systems, which occupies a large area, and free biomimetic enzymes cannot be recycled and reused, requiring investment Add hydrogen peroxide, the cost is higher

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] The effective volume of the reactor is 500 mL. Adjust the pH of the raw water to 4, the reaction temperature is 20°C, the reaction time is 120min, the air flow rate during aeration is 0.1L / min, the dissolved oxygen concentration is maintained at 5mg / L, and the stirring speed is 20r / min. Magnetic core-shell Fe 3 o 4 SiO 2 Immobilized laccase, the enzyme load is 5U / mg, and the dosage is 2000mg / L. The flocculants are polyaluminium-iron-silicon and polyacrylic acid, the dosage is 20mg / L and 2mg / L respectively, the fast stirring time is 2min, and the stirring intensity is 100r / min; the slow stirring time is 10min, and the stirring intensity is 20r / min . Bisphenol A and humic acid solution (both concentrations are 10mg / L) enter the enzyme-catalyzed enhanced flocculation reactor from the water inlet, the water filling time is 30min, the reaction time is 2h, and the sedimentation and drainage time is 1h. The removal rate of bisphenol A in the effluent treated by the system...

Embodiment 2

[0048] The effective volume of the reactor is 10L. Adjust the pH of the raw water to 7, the reaction temperature is 40°C, the reaction time is 5min, the air flow rate during aeration is 100L / min, the dissolved oxygen concentration is maintained at 40mg / L, and the stirring speed is 40r / min. Fe 2 o 3 Mesoporous carbon immobilized catecholase, the enzyme load is 5U / mg, and the dosage is 2000mg / L. The flocculant is polyaluminum chloride, the dosage is 500mg / L, the fast stirring time is 8min, and the stirring intensity is 300r / min; the slow stirring time is 20min, and the stirring intensity is 80r / min. 4-Chlorophenol and humic acid solution (10mg / L concentration) enter the enzyme-catalyzed enhanced flocculation reactor from the water inlet. The water filling time is 2 hours, the reaction time is 4 hours, and the sedimentation and drainage time is 2 hours. The removal rate of 4-chlorophenol in the effluent treated by the system is 85%. Under the same conditions, using a separate...

Embodiment 3

[0050] The effective volume of the reactor is 1L. Adjust the pH of the raw water to 5, the reaction temperature is 30°C, the reaction time is 30min, the air flow rate during aeration is 50L / min, the dissolved oxygen concentration is maintained at 10mg / L, and the stirring speed is 25r / min. Magnetic microspheres immobilized laccase were used for magnetic enzyme-carrying particles, the enzyme load was 100U / mg, and the dosage was 0.1mg / L; the reduced mediator was syringaldehyde, and the dosage was 10mmol / L. The flocculant is polyacrylamide, the dosage is 5mg / L, the fast stirring time is 5min, and the stirring intensity is 200r / min; the slow stirring time is 15min, and the stirring intensity is 60r / min. Naphthalene (10μg / L) and humic acid solution (10mg / L) enter the enzyme-catalyzed enhanced flocculation reactor from the water inlet. The water filling time is 1h, the reaction time is 3h, and the sedimentation and drainage time is 1h. The removal rate of naphthalene in the water tr...

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Abstract

The invention relates to a method for removing a trace amount of toxic pollutants in water by enzyme-loading magnetic particle reinforced flocculation. The method comprises the following steps that 1, enzyme-loading magnetic particles are used, an enzymatic cross-coupling polymerization reaction is controlled so that a trace amount of toxic pollutants enter into an organic macro-molecule structure by covalent binding, and after the reaction, the hydrophobicity and molecular weight of the organic structure are improved; 2, the enzyme-loading magnetic particles are subjected to magnetic recovery; and 3, the recovered enzyme-loading magnetic particles are added with a flocculating agent, and the pollutants obtained by enzymatic polymerization are easily precipitated and removed by coacervation / flocculation processes such as double electrode layer compression, adsorption electrical neutralization and precipitation net-capturing and thus a trace amount of the toxic pollutants in water are removed by enzyme-loading magnetic particle reinforced flocculation. The method has good selectivity and good treatment effects on low-concentration toxic pollutants, realizes recovery and use of an enzyme, has a low cost and a wide application range and is suitable for treatment on natural water, drinking water and waste water containing low-concentration toxic pollutants.

Description

technical field [0001] The invention relates to a method for removing organic pollutants in water, in particular, a method for enhancing flocculation and removing trace toxic organic pollutants in water by using magnetic particles loaded with enzymes is proposed. Background technique [0002] With the expansion of human production and living areas, a large number of exogenous trace toxic pollutants (such as persistent organic pollutants, POPs, etc.) have entered the water environment, and their concentrations are relatively low. However, such toxic pollutants are usually highly toxic. Through various channels such as ingestion and accumulation, trace concentrations can have abnormal effects on biological and physiological systems, and have potential "carcinogenic, teratogenic, and mutagenic" effects on the human body. Or make the endocrine imbalance of organisms, and most of them can be accumulated and transmitted step by step through the biological chain, thus bringing harm...

Claims

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Application Information

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IPC IPC(8): C02F9/14C02F101/30
CPCC02F9/00C02F1/48C02F1/56C02F1/725C02F3/342
Inventor 赵赫曹宏斌张懿
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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