近年来,我们在几项机械厂的设计中,遇到了较大量的含酸废水。这些废水的主要成分是硫酸,还有少量的硝酸、磷酸和其他有害物质。废水中的硫酸浓度为1,000～2,000毫克/升,PH 值在1～2之间,废水量为1,000～5,000米~3/日。这些废水如不妥善处理,任意排放,造成的主要危害是:1.腐蚀下水管道和钢筋混凝土沟筑物; In recent years, we have encountered a relatively large amount of acid-containing wastewater in the design of several machinery factories. The main component of these wastewaters is sulfuric acid, as well as small amounts of nitric acid, phosphoric acid and other harmful substances. The concentration of sulfuric acid in the wastewater is 1,000 to 2,000 mg/l, the pH is between 1 and 2, and the amount of wastewater is between 1,000 and 5,000 m and 3/day. If these waste waters are not properly disposed of and any of them are discharged, the main hazards are: 1. Corrosion of sewage pipelines and reinforced concrete trenches;