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):60-66.
热带离岸海岛污水水质特征统计学分析与成因解析
- Title:
- Statistical Analysis of Sewage Quality Characteristics and Its Cause Analysis in Tropical Offshore Islands
- Keywords:
- tropical offshore island; sewage treatment; water quality characteristics; statistical analysis; cause analysis
- 摘要:
- 热带离岸海岛地理位置、饮食结构的特殊性导致污水水质有差异，其污水中各项污染物浓度和污染物负荷一直困扰海岛污水处理工艺的选择、处理技术的研发和处理工程的改造，为了给热带离岸海岛污水处理的运维提供科学依据，以7个海岛的综合排放污水为研究对象，对几种水质指标进行统计学分析。结果表明，SS、NH3-N和TN浓度符合正态分布，COD、NO3--N和TP均呈正偏态分布；COD、SS、NH3-N、NO3--N、TN、TP平均值分别为554、178.34、69.80、1.33、80.36和8.64 mg/L；95%置信区间的浓度范围分别为518~590、165.09~191.60、67.09~72.51、1.05~1.60、77.88~82.84和7.94~9.31 mg/L。统计数据与国内典型城镇、农村地区的污水厂进水水质相比，海岛污水呈现有机物、氮、磷等污染物总体浓度高的特点，COD/TN和COD/TP的平均值分别为6.94、69.13，氨氮占总氮的比例达87%。
- 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.
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