Cement kiln nitrogen oxide reduction device and reduction method using acid fermentation food wastewater and anaerobic digestion wastewater

摘要

The present invention relates to an apparatus for reducing nitrogen oxides in a cement kiln, and more particularly, a food waste water supply tank that collects and supplies food waste water generated in a food waste feed facility and a food waste composting facility through a pretreatment process to collect and supply food waste water with minimal solids. (10) and; a food waste water fermentation tank 20 for acid-fermenting the food waste water supplied from the food waste water supply tank 10; an acid fermented food wastewater storage tank 40 for storing the acid fermented food wastewater fermented in the food wastewater fermentation tank 20; The acid fermented sound wastewater supplied from the acid fermented sound wastewater storage tank 40 can be sprayed with a reducing agent mixed with acid fermented sound wastewater, urea water, and compressed air in the section of the cement raw material input duct 80 of the cement kiln 87. an injector so as to be; The injection device 50 installed in the cement raw material input duct 80 is a configuration installed in one or a plurality, and the present invention recovers food wastewater with minimal solids and then acid-ferments it to maximize ammonium concentration. Used as a reducing agent in the selective non-catalytic reduction (SNCR) process to remove nitrogen oxides moving through the raw material input duct of the cement kiln to reduce the amount of urea water used and to increase the removal efficiency of nitrogen oxides. To a cement kiln nitrogen oxide reduction device and method using acid-fermented food wastewater and methane-fermented wastewater to prevent environmental pollution by recycling food wastewater and to be used as an auxiliary agent for urea water.