农药废水生物处理过程中溶解性有机物特性及荧光强度与COD的关系

doi:10.11934/j.issn.1673-4831.2017.09.009

Abstract

Abstract:

Three-dimensional fluorescence spectrum was used to investigate fluorescence spectral characteristics of dissolved organic matter (DOM) in organic pesticides wastewater under treatment, in an attempt to establish correlation between DOM fluorescence intensity and COD concentration. The analysis shows that there are three fluorescence peaks in the three-dimensional fluorescence spectrum. They are Peak A in the visible light zone reflecting the existence of fulvic acid, Peak B in the UV light zone reflecting the existence of fulvic acid and Peak C in the high excitation wavelength zone reflecting the existence of tryptophan. The fulvic acid with fluorescence in the visible light and UV light zones was degraded into more biodegradable tryptophan with fluorescence in the high excitation wavelength zone after the wastewater went through the air floatation tank, hydrolysis acidification tank and anaerobic fluidized bed. After going through the contact oxidation tank, the 3 types of DOM in the wastewater declined in fluorescence intensity as a result of biodegradation. Among the three, tryptophan degraded more quickly than fulvic acid. Of the four indices of DOM, fluorescence index (I_F) and biogenesis index (X_BI) reflect that the DOM in the wastewater comes mainly from extraneous sources, and fluorescence intensity ratio of fulvic acid in ultraviolet and visible region(r_B/A) and humification index (X_HI) reveal that the DOM has the properties of humus. With the treatment going on, both the fluorescence intensity of fulvic acid and the concentration of COD decreased with COD dropping from 3 311.0 to 169.6 mg·L^-1. The fulvic acid in the visible light zone dropped from 4 065.2 to 903.1 in fluorescence intensity, and the fulvic acid in the UV light zone did from 4 023.1 to 178.6. A good correlation between COD concentration and fluorescence intensities of the fulvic acid in the visible light and UV light zones has been discovered, with correlation coefficients being 0.978 1 and 0.981 3, respectively, which indicates that the technique of 3-D fluorescence spectrometry can be used to monitor real-time changes in COD concentration in organic pesticides wastewater under treatment.

Key words: organic pesticides wastewater, three-dimensional fluorescence spectrum, dissolved organic matter, fluorescence intensity, COD

CLC Number:

X703.1

HUANG Jian, YAN Sheng, ZHANG Hua, WANG Kun, LIU Pei-ran, QUAN Gui-jun, TIAN Ji-yu. Characteristics and Fluorescence Intensity of DOM in Pesticides Wastewater Under Bio-Treatment and Their Relationships With Concentration of COD.[J]. Journal of Ecology and Rural Environment, 2017, 33(9): 830-835.

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Characteristics and Fluorescence Intensity of DOM in Pesticides Wastewater Under Bio-Treatment and Their Relationships With Concentration of COD.

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