Generally in the sludge drying process of larger scale will be used to collect odor, and then through the spray tower, the sludge plant deodorant directly into the circulating water, without other auxiliary equipment can be added in accordance with the first time around 1-3 per thousand. Add a sludge deodorizer circulating water, in the water circulation process, and the exhaust gas reaction, so that the original purification equipment to improve the purification efficiency of 90%, you can better achieve the removal of odors, the role of harmful gases.