给水排水工程毕业设计焦作市温县县城给水工程初步设计.doc

焦作市温县县城给水工程初步设计 摘要：地上式溶解氧法除铁除锰工艺流程，有几种形式。选用什么样的流程主要取决于原水的化学成分，如水的碱性；铁和锰的含量。当水中碱度大于2.0mg/l；铁小于2.0mg/l；锰小于1.5mg/l时可采用简单气一级过滤法处理，达到除铁除锰的目的。当水中铁的含量大于5mg/l；锰大于1.5mg/l时一般采用二级过滤工艺，一级过滤先除铁，二级过滤再除锰原因是当铁和锰同时存在于水中时，铁能干扰锰的去除，特别是铁和锰的含量较高时，除锰就更困难。必须采用曝气→一级过滤→二次曝气→二次过滤工艺流程,方能将水中的铁和锰除去,若采用曝气→一级过滤的简单工艺是不可能达到除锰的目的。为了尽可能除锰，一级除铁后的过滤出水，增加了机械强制曝气措施，其目的有二个，一是尽量除去一级处理出水中的二氧化碳，提高水的PH值（据有关资料介绍，表面曝气法可以去除50%-70%的二氧化碳）；二是尽可能的向一级出水中充氧（溶解氧饱和度可达80%-90%），将水中的二价锰大部分氧化成三价锰，然后进入二级过滤时，将水中的锰和一级过滤后残留在水的铁彻底除去，保证出水水质。溶解氧法除铁除锰曝气二级过滤Abstract ： Ground-DO Act iron, manganese process, there is several forms. What kind of selection process mainly depends on the original chemical composition of water, as water alkaline; Iron and manganese content. When alkalinity is less than 2.0mg/l; Rail 2.0mg/l; Manganese is less than 1.5mg/l deals with a simple aeration filter, in addition to iron, and manganese from the purpose. When the water content of the iron manganese than 5mg/l; than 1.5mg/l when two commonly used filtering technology In addition to a first filter iron and two filtered manganese reason is that when iron and manganese exist in the water, can interfere with iron manganese removal, especially iron and manganese content is high, with the exception of manganese is even more difficult. It is must to get a aeration second aeration filter →secondary filtration process, in order to the water to remove iron and manganese. If using aeration → a simple filtering process is unlikely to be able to achieve the purpose of manganese. To the extent possible, manganese, iron after a filter from the water, should increase the mandatory mechanical aeration measures, the purpose of which is two. First, as a treatment to remove carbon dioxide from the water, raising the pH of water (according to the information sheets, surface aeration method can remove the carbon dioxide 50%-70%); Second, as much as possible out of the water to a 256 (dissolved oxygen saturation of up to 80%-90% ) Water will be the t