SHEN Tong,GUO Hua-yu,ZHAO Zhi-wei,et al.Statistical Analysis of Sewage Quality Characteristics and Its Cause Analysis in Tropical Offshore Islands[J].China Water & Wastewater,2021,37(19 19):60-66.
Statistical Analysis of Sewage Quality Characteristics and Its Cause Analysis in Tropical Offshore Islands
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第37卷
Number:
19 19
Page:
60-66
Column:
Date of publication:
2021-10-01
- Keywords:
- tropical offshore island; sewage treatment; water quality characteristics; statistical analysis; cause analysis
- Abstract:
- The special geographical location and diet structure of tropical offshore islands lead to the difference of sewage quality. The concentration and load of pollutant in the sewage have always troubled the selection of the sewage treatment technology, research and development of the treatment process and reconstruction of the treatment project in the islands. To provide a scientific basis for the operation and maintenance of the sewage treatment in tropical offshore islands, several water quality indexes of the comprehensive sewage discharged from 7 islands were analyzed statistically. The SS, NH3-N and TN conformed to normal distribution, while COD, NO3--N and TP were all positive skew distribution. The average COD, SS, NH3-N, NO3--N, TN, and TP were 554 mg/L, 178.34 mg/L, 69.80 mg/L,1.33 mg/L, 80.36 mg/L and 8.64 mg/L, respectively, and the 95% confidence intervals were 518-590 mg/L, 165.09-191.60 mg/L, 67.09-72.51 mg/L, 1.05-1.60 mg/L, 77.88-82.84 mg/L and 7.94-9.31 mg/L. The statistical data was compared with the influent quality of the sewage treatment plants in typical towns and rural areas in China, and the sewage quality of the islands showed the characteristic of high concentration of pollutants such as organics, nitrogen and phosphorus. The average values of COD/TN and COD/TP were 6.94 and 69.13, and the ammonia nitrogen accounted for 87% of the total nitrogen.
Last Update:
2021-10-01