The invention discloses a zero discharge sewage treatment method for sewage sludge. The sewage is introduced into the flocculation tank, and the pH is adjusted by alkali, lime or acid, and a composite flocculant composed of aluminium sulfate and polyacrylamide is added. The composite flocculant is: refined industrial aluminium sulfate, a solution with a weight ratio of 45-65%, 100-1500 ppm, 0.1-3 ppm of polyacrylamide and 90.1-3 ppm of polyacrylamide. The characteristics of the flocs are: (1) the upper part of the sedimentation tank is colorless and clear water, which is introduced into the clear water tank for recycling; (2) the sludge in the lower part of the sedimentation tank is pumped into the sludge treatment tank for treatment, and the pH 3-5 is adjusted by sulfuric acid or hydrochloric acid. Aluminum hydroxide is dissolved to form an aluminium salt solution. The above clear liquid is used as flocculant for recycling. The recovery rate of aluminium sulfate is 70-87%. (3) The sediment under the sludge treatment tank is neutralized to neutral by alkali or lime and used as organic fertilizer. The invention not only realizes zero discharge of sewage and sludge, but also makes the comprehensive cost of sewage treatment low or slightly profitable. To make positive contributions to the development of local economy and environmental protection.
【技术实现步骤摘要】
一种污水污泥零排放污水处理方法
本专利技术涉及一种污水污泥零排放的污水处理方法。
技术介绍
污水处理技术总体而言可分为物理处理技术、物理化学处理技术、生物化学处理技术和化学处理技术,其中以污水的生物化学处理技术最为常用。
技术实现思路
本专利技术的目的是提供一种污水污泥零排放污水处理方法,达到污水净化的要求,又通过回收硫酸铝循环使用大大降低成本,同时使处理后的清水可以回用,残渣也得到处理和收集,可作有机肥料。实现了污水、污泥零排放,而且使污水处理的综合成本很低,或略有盈利。本专利技术的方法为:一种污水污泥零排放污水处理工艺流程,将污水引入絮凝池中,用碱、石灰或酸调节pH6~9,加入硫酸铝和聚丙烯酰胺组成的复合絮凝剂,复合絮凝剂为:精制工业硫酸铝,配制成重量比为45~65%左右的溶液,加入量100~1500ppm,聚丙烯酰胺加入量0.1~3ppm,以90~150转/分的速度,搅拌20~50分钟,形成絮体,引入沉降池,沉降池中絮体长大下沉,(1)沉降池上部为无色透亮清水,引入清水池中,循环使用,(2)沉降池下部污泥,泵入污泥处理池中处理,用硫酸或盐酸调节pH3~5,氢氧化 ...
【技术保护点】
1.一种污水污泥零排放污水处理方法,将污水引入 絮凝池中,用碱、石灰或酸调节pH6~9,加入硫酸铝和聚丙烯酰胺组成的 复合絮凝剂,复合絮凝剂为:精制工业硫酸铝,配制成重量比为45~65% 的溶液,加入量100~1500ppm,聚丙烯酰胺加入量0.1~3ppm,以90~150 转/分的速度,搅拌20~50分钟,形成絮体,引入沉降池,沉降池中絮体长 大下沉,其特征在于: (1)沉降池上部为无色透亮清水,引入清水池中,循环使用, (2)沉降池下部污泥,泵入污泥处理池中处理,用硫酸或盐酸调节 pH3~5,氢氧化铝溶解,形成铝盐溶液,分层,上面的清液作絮凝剂循环 使用,硫酸铝回收率达 ...
【技术特征摘要】
1.一种污水污泥零排放污水处理方法,将污水引入絮凝池中,用碱、石灰或酸调节pH6~9,加入硫酸铝和聚丙烯酰胺组成的复合絮凝剂,复合絮凝剂为:精制工业硫酸铝,配制成重量比为45~65%的溶液,加入量100~1500ppm,聚丙烯酰胺加入量0.1~3ppm,以90~150转/分的速度,搅拌20~50分钟,形成絮体,引入沉...
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