Rapid, sensitive and on-line measurement of chemical oxygen demand by novel optical method based on UV photolysis and chemiluminescence

2007 ◽  
Vol 87 (1) ◽  
pp. 56-61 ◽  
Author(s):  
Yingying Su ◽  
Xiaohong Li ◽  
He Chen ◽  
Yi Lv ◽  
Xiandeng Hou
Keyword(s):  
Chemical Oxygen Demand ◽  
Optical Method ◽  
Oxygen Demand ◽  
Uv Photolysis ◽  
Line Measurement ◽  
On Line

Self-monitoring of water quality in sewer systems using absorbance of ultraviolet and visible light

2001 ◽  
Vol 44 (2-3) ◽  
pp. 269-276 ◽  
Author(s):  
G. Ruban ◽  
Y. Yuperd ◽  
B. Laveau ◽  
E. Lucas
Keyword(s):  
Optical Measurement ◽  
Oxygen Demand ◽  
Feeding System ◽  
Short Delay ◽  
Self Monitoring ◽  
Line Measurement ◽  
Rainy Weather ◽  
On Line ◽  
Pollution Measurement

Continuous pollution measurement is interesting to optimize the operation of sanitary facilities as well as to minimize the stormwater discharges. An experimental study was carried out for the determination of Suspended Solids (SS) and Chemical Oxygen Demand (COD) concentrations in combined sewers using ultraviolet and visible absorbances. The maintenance of the measurement system requires six hours a month for the cleaning of the hydraulic feeding system and adjustment of the optical device. The feeding system developed increased the representativeness and reliability of the pollution measurement, but needs to be validated on other measurement sites. The determination of SS concentrations from visible absorbances requires 2 calibration curves for dry and rainy weather respectively. The corresponding accuracies appear satisfactory when compared with the results of standard sampling/laboratory analysis. The accuracy of COD determination from ultraviolet absorbance is less satisfactory, but could perhaps be improved taking into account another parameter. Then the optical measurement of SS and COD is interesting to determine average or long term pollution loads, for example the yearly impact of urban stormwater discharges. With this kind of continuous and on-line measurement, it is possible to react with short delay to unexpected phenomena which could damage the environment or water treatment efficiency.

On-line Monitoring Technology for Chemical Oxygen Demand Based on Full-spectrum Analysis

2012 ◽  
Vol 41 (8) ◽  
pp. 883-887 ◽  
Author(s):  
冯巍巍 FENG Wei-wei ◽  
李玲伟 LI Ling-wei ◽  
李未然 LI Wei-ran ◽  
孙西艳 SUN Xi-yan ◽  
付龙文 FU Long-wen ◽  
...  
Keyword(s):  
Chemical Oxygen Demand ◽  
Spectrum Analysis ◽  
Oxygen Demand ◽  
Full Spectrum ◽  
Monitoring Technology ◽  
On Line

COD On-Line Monitoring Based on Photometric

2012 ◽  
Vol 616-618 ◽  
pp. 1930-1934
Author(s):  
Mo Jie Sun ◽  
Xing Shuang Wei ◽  
Wei Zhang ◽  
Song Liu
Keyword(s):  
Chemical Oxygen Demand ◽  
Incident Light ◽  
Photovoltaic Cells ◽  
Oxygen Demand ◽  
Organic Substances ◽  
Photoelectric Conversion ◽  
Important Indicator ◽  
Real Time Clock ◽  
On Line

The chemical oxygen demand (COD) is an important indicator of the characterization of organic substances in water content, reflecting the situation of water pollution. This system takes the IC, A/D and AT89C52 as key module, according to Lambert-Bill’s law and colorimetric principle, uses silicon photovoltaic cells and operational amplifier to realize photoelectric conversion. Incident light and transmitted light intensity of liquid are measured. The microcontroller can be automatically calculated the solution of the chemical oxygen demand (COD) value. The system also has real-time clock, over-range alarm and other functions.

Implementation of an automatic and miniature on-line multi-parameter water quality monitoring system and experimental determination of chemical oxygen demand and ammonia-nitrogen

2015 ◽  
Vol 73 (3) ◽  
pp. 697-706 ◽  
Author(s):  
Yingke Xie ◽  
Zhiyu Wen ◽  
Zhihong Mo ◽  
Zhiqiang Yu ◽  
Kanglin Wei
Keyword(s):  
Water Quality ◽  
Chemical Oxygen Demand ◽  
Monitoring System ◽  
Oxygen Demand ◽  
Water Quality Monitoring ◽  
Ammonia Nitrogen ◽  
Quality Monitoring ◽  
National Standard ◽  
Relative Standard ◽  
On Line

An automatic, miniature and multi-parameter on-line water quality monitoring system based on a micro-spectrometer is designed and implemented. The system is integrated with the flow-batch analysis and spectrophotometric detection method. The effectiveness of the system is tested by measuring chemical oxygen demand (COD) and ammonia-nitrogen in water. The results show that the modified system provides a cost-effective, sensitive, reproducible and reliable way to measure COD and ammonia-nitrogen in water samples with automatic operation and low toxic chemical consumption. In addition, the experiment results show that the relative error of the system is less than 10%, the limit of detection is 2 mg/L COD and 0.032 mg/L ammonia-nitrogen, respectively, and the relative standard deviation was 6.6% at 15.0 mg/L COD (n = 7) and 5.0% at 0.300 mg/L ammonia-nitrogen (n = 7). Results from the newly designed system are consistent with the data collected through the Chinese national standard analysis methods.

An instrument for on-line chemical oxygen demand and nitrate in water monitoring

2016 ◽  
Author(s):  
Wei-Wei Feng ◽  
Dan Li ◽  
Zong-Qi Cai ◽  
Yong-Chun Zhang ◽  
Xiao Xu
Keyword(s):  
Chemical Oxygen Demand ◽  
Oxygen Demand ◽  
Water Monitoring ◽  
On Line
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