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Degradation prediction method for removing micro-pollutants in secondary effluent by ultraviolet/sodium persulfate

A technology of sodium persulfate and secondary effluent, applied in the fields of water pollutants, chemical instruments and methods, light water/sewage treatment, etc., can solve the problems of unknown degradation effect of various organic substances, reduce the cost of small test and ensure uniformity sexual effect

Active Publication Date: 2019-04-19
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Ultraviolet / sodium persulfate (UV / PS) is an effective advanced oxidation technology, but the degradation effect of UV / PS on various organic substances is unknown, and multiple experimental calculations are required

Method used

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  • Degradation prediction method for removing micro-pollutants in secondary effluent by ultraviolet/sodium persulfate
  • Degradation prediction method for removing micro-pollutants in secondary effluent by ultraviolet/sodium persulfate
  • Degradation prediction method for removing micro-pollutants in secondary effluent by ultraviolet/sodium persulfate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] The following example selects acesulfame potassium (ACE) and sucralose (SUC) in artificial sweeteners as the target pollutants, and illustrates the establishment of the degradation model of ACE and SUC in the UV / PS removal secondary effluent.

[0036] A method for predicting the degradation of micropollutants in secondary effluent water by ultraviolet / sodium persulfate, comprising the following steps:

[0037] S1: Taking p-chlorobenzoic acid (pCBA) and naproxen (NPX) as reference substances, based on UV / PS Based on the reaction mechanism of pCBA and NPX, the apparent reaction rate constants of pCBA and NPX are used as independent variables, respectively designed at high, medium and low levels of concentration, and the experimental program is designed using a kinetic model. The entire design has multiple test points;

[0038] S2: According to the experimental plan designed by the kinetic model, take the effluent from the secondary sedimentation tank of 3 domestic sewage tr...

Embodiment 2

[0056] The difference from Example 1 is that the photoreactor in step S2 mainly includes a frame body 1, a quartz glass tube 2, an ultrasonic probe 3, an electromagnetic stirrer 4, and a power supply. The top of the frame body 1 is provided with a return channel 11, and the return channel Screening grid 12 is arranged in the horizontal direction in 11, rotating nozzles 13 are evenly distributed at the lower end of return channel 11, spiral return pipe 14 is provided on the left and right sides of the outer wall of frame body 1, and the liquid inlet of spiral return pipe 14 is connected with frame body 1 The lower end is connected, and the liquid outlet of the spiral return pipe 14 is connected with the return channel 11. The quartz glass tube 2 has a spiral structure, and there are three quartz glass tubes 2, which are evenly distributed inside the frame body 1. There is an ultraviolet mercury lamp inside the quartz glass tube 2. Rod 21; the vertical middle part of frame body 1...

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Abstract

The invention discloses a degradation prediction method for removing micro-pollutants in secondary effluent by ultraviolet / sodium persulfate. The method includes the following steps: S1, selecting p-chlorobenzoic acid and naproxen as reference materials, and establishing a reaction kinetics model of target pollutants, p-chlorobenzoic acid, naproxen and free redicals under ultraviolet / sodium persulfate; S2, adding the target pollutants, p-chlorobenzoic acid and naproxen into actual water, and oxidative degradation is carried out by using ultraviolet / sodium persulfate advanced oxidation technology; and S3, calculating the free radical content according to a degradation effect of the p-chlorobenzoic acid and naproxen by using the model, and predicting degradation conditions of the target pollutants. The model is established by measuring the degradation of the two reference materials to fit the degradation of the multiple pollutants in the secondary effluent under the ultraviolet / sodium persulfate, thereby evaluating the feasibility of removing the target pollutants in the secondary effluent by the ultraviolet / sodium persulfate and effectively reducing the cost of small tests.

Description

technical field [0001] The invention belongs to the technical field of sewage purification treatment, and in particular relates to a degradation prediction method for removing micro-pollutants in secondary effluent by ultraviolet / sodium persulfate. Background technique. [0002] With the improvement of detection technology, refractory and highly toxic micro-pollutants are often detected in water bodies, but traditional water treatment processes cannot effectively remove such refractory organic micro-pollutants. Organic micro-pollutants are a class of substances that need to be controlled in water quality management. They can not only cause environmental pollution, but also be extremely harmful to human health. Pesticides, polycyclic aromatic hydrocarbons, halogenated aliphatic hydrocarbons, polychlorinated biphenyls, phenols and other organic compounds commonly found in environmental waters are organic micro-pollutants. Organic micropollutants usually have the following com...

Claims

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Application Information

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IPC IPC(8): C02F1/32C02F1/72C02F101/30
CPCC02F1/32C02F1/72C02F2101/30
Inventor 耿金菊傅滢滢任洪强许柯
Owner NANJING UNIV
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