Chemical and Biological Hydrogen Sulfide Controls for Anaerobic Biogas

摘要

Removal of hydrogen sulfide from anaerobic biogas is necessary to facilitate it’s use as a fuel source and minimize sulfur dioxide emissions from wastewater treatment plants. A review of the state of the art in hydrogen sulfide removal is provided, and a new process integrating biological nutrient removal and hydrogen sulfide removal is presented. By utilizing nitrite produced in the separate nitrification of high ammonia in-plant recycles, hydrogen sulfide is converted to sulfate, at the expense of nitrite, while producing alkalinity that can be utilized in the nitrification process. Integration of this novel combined biological and chemical process, converts high-ammonia recycle streams into a resource that allow for removal of hydrogen sulfide from the biogas, while using biologically produced compounds from within the plant. This permits hydrogen sulfide removal with effectively no operating costs attached, while capital costs would be at a fraction of a system with equivalent capacity.