Abstract
Total organic carbon (TOC) and chemical oxygen demand (CODCr) are indicators of the degree of organic pollution in water. At present, CODCr is mainly used as an evaluation index in China, and the detection method of CODCr is more complicated and time-consuming than TOC. In this paper, it uses the Micro-Pressure Inner-Loop Bioreactor (MPR) to treat urban sewage, studies the treatment effect of MPR on organic pollutants, and further analyzes the correlation between TOC and CODCr. TOC and CODCr of municipal wastewater and MPR treated effluent were measured by total organic carbon analyzer and dichromate method respectively, and the degree of organic pollution of water samples was analyzed. The results showed that the average removal rates of TOC and CODCr in municipal wastewater were 83.54% and 90.81%, respectively. The theoretical correlation coefficient between TOC and CODCr in experimental raw water was only 0.7322. After MPR treatment, the correlation coefficient increased to 0.9534. For water samples with fixed contaminants and stable contents, TOC can be used to calculate water CODCr by linear fitting relationship.
Highlights
The most common and harmful of environmental pollution is organic pollutants
Most of China's current environmental quality standards, pollutant discharge standards, etc. mainly use CODCr as a water quality evaluation index to characterize the content of organic pollutants
The raw water in this experiment is mainly urban sewage, and the Total organic carbon (TOC) concentration in raw water during the experimental operation is generally 20 ~ 40 mg·L-1. It can be analyzed from figure 1 that the TOC concentration in the effluent of Micro-Pressure Inner-Loop Bioreactor (MPR) treatment is about 3.20 ~ 5.80 mg·L-1, and the removal rate fluctuates between 74% and 89%, with an average of 83.54%
Summary
The most common and harmful of environmental pollution is organic pollutants. With the implementation of China's total pollutant discharge control system, online automatic monitoring of organic pollutants is important. TOC and CODCr are two comprehensive indicators for evaluating organic pollutants in water environment, and have theoretical correlation. The research on the correlation is more at home and abroad[14]. The United States mainly monitors the content of organic matter in water bodies by TOC indicators. Japan included TOC indicators in Japanese industrial standards in the early 1970s. Most of China's current environmental quality standards, pollutant discharge standards, etc. Mainly use CODCr as a water quality evaluation index to characterize the content of organic pollutants Most of China's current environmental quality standards, pollutant discharge standards, etc. mainly use CODCr as a water quality evaluation index to characterize the content of organic pollutants
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