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.

Estimation of Chemical Oxygen Demand by Ultraviolet Spectroscopic Profiling and Physical Parameters Using IPW-PLS Algorithm

2013 ◽  
Vol 316-317 ◽  
pp. 606-609 ◽  
Author(s):  
Jia Chen Li ◽  
Ping Jie Huang ◽  
Di Bo Hou ◽  
Guang Xin Zhang
Keyword(s):  
Water Quality ◽  
Chemical Oxygen Demand ◽  
Organic Pollutant ◽  
Oxygen Demand ◽  
Organic Pollution ◽  
Quality Analysis ◽  
Ultraviolet Absorption Spectrum ◽  
Physical Parameters ◽  
Wave Band ◽  
Full Spectrum

In recent years, water pollution is increasing, especially organic pollution. The chemical oxygen demand (COD) is one of the most important evaluation index. Compared with the traditional chemical analysis method of COD, the method of spectrum analysis of organic pollutant concentration in water quality detection is fast, no chemical reagent and simple operation etc, and it is a kind of green testing technology. The current spectrum method of water quality analysis is usually based on single wavelength or the feature band extracted. It is lack of methods with the full spectrum scan. Based on water quality research,we choose the spectral analysis of COD as the objective. Combining the ultraviolet absorption spectrum with the conventional five physical parameters as the absorbance in the last wave band, we use the iterative predictor partial least squares algorithm to realize the rapid detection of water quality COD.

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.

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