ANAEROBIC DIGESTION OF WASTEWATER WITH HIGH SULFATE CONCENTRATION USING MICRO-AERATION AND NATURAL ZEOLITES

作者：Montalvo S; Prades H; Gonzalez M; Perez P; Guerrero L; Huilinir C

来源：Brazilian Journal of Chemical Engineering, 2016, 33(4): 743-752.

DOI：10.1590/0104-6632.20160334s20150261

• Granulation process
• Micro-aeration
• Sulfate
• Sulfide
• Temperature
• UASB
• Zeolite

The behavior of anaerobic digestion in batch and UASB reactors using a microaerobic process and natural zeolites was studied. Laboratory assays were carried out across 4 sets of variables: different COD/SO42- ratios, different airflow levels, with and without natural zeolites and room and mesophilic controlled temperatures. The microaerobic process demonstrated hydrogen sulfide removal levels exceeding 90% in most cases, while maintaining the flammable condition of the generated biogas. The level of COD removal exceeded 75% in UASB reactors despite their operation under very low hydraulic retention times (2.8-4.8 hours). The effectiveness of natural zeolites in accelerating UASB reactor startup was demonstrated. Results showing the positive influence of zeolites on the granulation process in UASB reactors were also achieved.

• 出版日期2016-12