Method for efficiently producing short-chain fatty acid by anaerobic fermentation of primary sludge

The invention belongs to the field of environmental protection and solid waste resource utilization, and particularly relates to a method for efficiently producing short-chain fatty acid through anaerobic fermentation of primary sludge. The method comprises the following steps: carrying out gravity settling on primary sludge of a sewage treatment plant, discharging supernate to obtain an anaerobic fermentation raw material, mixing the anaerobic fermentation raw material with rhamnolipid, filling nitrogen, sealing a reactor, carrying out freeze thawing treatment, and finally carrying out anaerobic fermentation. Rhamnolipid and ice melting treatment are combined to be used for producing acid through anaerobic fermentation of the primary sludge, a large amount of short-chain fatty acid is produced, the primary sludge used in the process is remarkably reduced, and the treatment and disposal cost is reduced. 本发明属于环境保护以及固体废弃物资源化利用领域，具体涉及一种使用初沉污泥厌氧发酵高效产出短链脂肪酸的方法。所述方法包括将污水处理厂的初沉污泥重力沉降排掉上清液得到厌氧发酵原料，厌氧发酵原料与鼠李糖脂混合，充入氮气后