بررسی تأثیر راکتور بافل دار بی هوازی اصلاح شده با صافی بی هوازی (ABR-AF) در تصفیه شیرابه زباله

Background and purpose: Solid waste leachate including different physical, chemical and biological pollutants is one of the most contaminated wastewater types. The limitations of conventional biological method for leachate treatment are the high energy consumption, nutrient requirement, sludge production, and cost. In this research, the efficiency of anaerobic baffled reactor modified by anaerobic filter (ABR-AF) was studied in solid waste leachate treatment located in Sari. Materials and methods: In this study, two glass reactors (six cells) were used. Each cell in upward section was equipped with a sampling port (and also a gas exit) and the volume of each reactor was 5.7 L. The initial cell was used for suspended solid settling and the last cell acted as an anaerobic filter in ABR-AF. The blank reactor characteristics were the same as the initial one except that it was without sludge and filter media. The interior temperature of the cells was adjusted by four electrical elements. After reaching the equilibrium, the leachate with different organic loading entered the reactor. Then, different parameters (COD, BOD5, TSS, o-phosphate, nitrate, ammonia, pH, etc.) were measured in different places of the reactors. All analyses were performed according to the “Standard Methods for the Examination of Water and Wastewater”. To analyze the data, analysis of variance and regression tests were performed in SPSS version 16. Results: The system efficiency for COD removal varied in the range of 39-96%. The maximum efficiency for COD removal was related to three days detention time and 10.72(Kg COD/m3.d) organic loading, while the minimum efficiency for it before the filter was related to one day detention time and 1.96 (Kg COD/m3.d) organic loading. The average efficiency for BOD5 removal varied from 39 to 58% and it ranged from 4 to 16% for o-phosphate removal. Conclusion: The ABR-AF system alone is not able to provide the effluent discharge requirement to surface and groundwater, but it can meet the needs of effluent discharge requirement to agricultural waterways.