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Method for removing haloacetic acid substances in swimming pool water

A technology of acetic acid and haloacetic acid, which is applied in the field of treatment of disinfection by-products in water, can solve the problems of affecting the efficiency of biochemical degradation of HAAs, affecting the efficiency of photodegradation of HAAs, and the inactivation of biodegradation bacteria, achieving simple process, high economic benefit, The effect of short processing time

Pending Publication Date: 2022-04-15
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, humic acids, nitrates, chlorides, and sulfates commonly found in swimming pool water will shield OH and affect the photodegradation efficiency of HAAs.
In addition, HAAs are often degraded to smaller molecular weight organics whose toxicity remains unknown
Biodegradation is an effective process for removing HAAs in water systems, but its application is limited by the high concentration of disinfectant residues in swimming pool water, and the strong oxidizing properties of disinfectants may inactivate the corresponding biodegrading bacteria
In addition, other parameters such as water temperature, residence time, and organic matter composition can also affect the efficiency of biochemical degradation of HAAs.

Method used

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  • Method for removing haloacetic acid substances in swimming pool water
  • Method for removing haloacetic acid substances in swimming pool water
  • Method for removing haloacetic acid substances in swimming pool water

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] (1) Four kinds of commercial flat-plate nanofiltration / reverse osmosis polyamide membranes were cut and soaked in a glass bottle containing deionized water for 24 h, taken out and washed with deionized water for 4-5 times before use;

[0049] (2) Start the nanofiltration / reverse osmosis system, and clean the nanofiltration / reverse osmosis twice with deionized water under 0.2 bar pressure;

[0050] (3) After cleaning, install the diaphragm in the membrane tank, add deionized water to the water storage tank, start the booster pump, keep the filtration time for at least 8 hours, the system is in a stable state, and the temperature, pressure and flow no longer change with time. changes, and the membrane flux remains constant.

[0051] (4) After the system is stabilized, sodium chloride and HAAs are added to the water storage tank to form simulated swimming pool water. The main components of the simulated water are 0.05 mol / L NaCl and 900 μg / L HAAs (100 μg / L for each HAA), ...

Embodiment 2

[0061] (1) The cutting and cleaning of the membrane material are the same as in Example 1;

[0062] (2) nanofiltration / reverse osmosis system startup and cleaning are the same as in Example 1;

[0063] (3) nanofiltration / reverse osmosis system is stable with embodiment 1;

[0064] (4) After the system is stabilized, add actual swimming pool water to the water storage tank, and the swimming pool water is taken from a normal running swimming pool,

[0065] This example was carried out at a temperature of 25°C, pH 7.5, and a pressure of 100 psi with a fixed cross-flow flow rate of 0.8 L / min;

[0066] (5) Sampling and HAA testing are the same as in Example 1.

[0067] Table 2 shows the removal rates of 9 different types of HAAs by four commercial flat membranes in the background of actual swimming pool water matrix.

[0068]

[0069] The concentrations of CAA, BAA, DBCAA and TBAA in actual swimming pool water were all below 2 ug / L. Under the background of the actual swimmin...

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Abstract

The invention provides a method for removing haloacetic acid substances in swimming pool water. The method comprises the following steps: cutting a membrane material, soaking the cut membrane material in a glass bottle containing deionized water for 24 hours, taking out the soaked membrane material, and cleaning the membrane material for later use; starting a nanofiltration / reverse osmosis system, cleaning a membrane system with deionized water under low pressure, and mounting a membrane in a membrane pool after cleaning is finished; actual swimming pool water or simulated swimming pool water is added into a water storage tank, the temperature, pressure and flow are adjusted, and after the system operates stably, sampling is carried out to detect the concentration of haloacetic acid substances; the detection method of the haloacetic acid substances comprises the following steps: carrying out liquid-liquid extraction derivatization treatment on a water sample proposed on the basis of EPA 552.3, and then carrying out gas chromatography-mass spectrometry detection. The membrane separation technology is used for removing haloacetic acid substances in the swimming pool water, and the method has the advantages of being simple in technology, easy and convenient to operate, high in removal rate and the like.

Description

technical field [0001] The invention relates to the technical field of treatment of disinfection by-products in water, in particular to a method for removing haloacetic acids in swimming pool water. Background technique [0002] Swimming is a popular sport and recreational activity in recent years. Swimming pools are usually disinfected with disinfectants such as chlorine, sodium hypochlorite or calcium hypochlorite to avoid infectious diseases caused by pathogenic microorganisms in the water. However, the heavy use of chlorine-containing disinfectants and the long residence time of swimming pool water have resulted in the production of high concentrations of haloacetic acids (HAAs) in swimming pool water. There are nine main types of haloacetic acids, including monochloroacetic acid (MCAA), dichloroacetic acid (DCAA), trichloroacetic acid (TCAA), monobromoacetic acid (MBAA), dibromoacetic acid (DBAA), and tribromoacetic acid (TBAA). , Monochloromonobromoacetic acid (BCAA)...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/44C02F103/42C02F101/36C02F101/34
Inventor 杨林燕曹国民赵慧慧蒋杰伦谢颖绮朱琳王玉海
Owner EAST CHINA UNIV OF SCI & TECH