The invention discloses a method for treating high concentration ammonia nitrogen wastewater by ferric sulfate, belonging to the field of sewage treatment. The method comprises the following steps: (1) the cast iron sulfate wastewater with high concentration of ammonia nitrogen to ammonia nitrogen, the molar ratio of ferric sulfate: 0.1:0.15 ~ 0.3; (2) heating to 50 to 95 DEG C, adjusting the pH value is 1 ~ 4, 3 ~ 12 hours to maintain the value of response of the pH under stirring. The invention removes the high concentration ammonia nitrogen in the solution. After drying and pyrolysis, the decomposed products of ammonium ferric sulfate are Fe2 (SO4) 3 and ammonia. Fe2 (SO4) 3 can be reused, and ammonia can be used as a raw material for fertilizers. The jarosite crystals can also be used as a yellow pigment. The method of using chemical precipitation method of high concentration ammonia nitrogen removal from wastewater, avoid the biological removal of high concentration ammonia nitrogen to dilute, and the complex process of nitrification and denitrification, realizes one-step precipitation of high concentration ammonia nitrogen removal.
【技术实现步骤摘要】
本专利技术涉及一种处理高浓度氨氮废水方法,更具体的说是一种利用硫酸铁处理高 浓度氨氮废水的方法。
技术介绍
氨氮废水的大量排放已引起环保领域和全球范围的重视。氨氮废水的超标排放容 易引水中藻类和其他微生物大量繁殖,导致水体富营养化,除了使水中有异味外,严重时会 降低水中溶解氧,使得鱼虾死亡;氨氮还会增大给水消毒和工业循环水杀菌处理的用氯量, 造成自来水厂运行困难;对某些金属,特别是对铜具有腐蚀性。目前,处理高浓度氨氮废水的方法主要有吹脱法、催化湿式氧化、离子交换法、化 学沉淀法等。吹脱汽提法流程简单,但是需要在碱性条件下进行,有较高的能耗和碱耗,并 且汽提塔内容易结垢。催化湿式氧化具有净化效率高、流程简单、占地面积小等优点,但催 化剂容易流失。磷酸铵镁沉淀法运行成本过高,虽能回收磷酸铵镁作为化肥使用,但其受地 域和市场限制,未能广泛应用,且引入了新的污染物磷,带来二次污染的风险。离子交换法 处理高浓度氨氮废水时,树脂需要频繁再生,处理和再生成本较高。硫酸铁是一种常用的无机混凝剂,具有较强的絮凝作用,由于其比铝盐重,故形成 的絮体更易沉淀。硫酸铁在常温下作为混凝剂 ...
【技术保护点】
1.一种利用硫酸铁处理高浓度氨氮废水的方法,其步骤为:(1) 将硫酸铁投加到高浓度氨氮废水中,摩尔比氨氮:硫酸铁为0.1:0.15~0.3;(2) 升温至50~95℃,调整其pH值为1~4,在搅拌下维持上述pH值反应3~12小时。
【技术特征摘要】
还没有人留言评论。发表了对其他浏览者有用的留言会获得科技券。