污泥脱水工作原理
1、药剂预处理脱水
为提高污泥的脱水性, 改良滤饼的性质,增加物料的渗透性,本机使用独特的“动(静)态絮凝造粒混合器”的装置,加入的浓度为2-5‰阴(阳)以达到化学加药絮凝的作用,该方法不但絮凝效果好,还可节省大量药剂,运行费用低,经济效益十分明显。
2、重力浓缩脱水段
污泥经布料斗均匀送入网带,,物料间的结合水及表面水被分离成自由水。 当物料被输送铺展到加长的重力预脱水区(或带式浓缩机上)的滤网上,在重力的作用下自由水透过滤网背面而渗出分离,形成不流动状态的污泥,到达压榨脱水区实施最大压力条件。
3、楔形区预压脱水段
重力脱水后的污泥流动性几乎完全丧失,随着带式压榨机滤带的向前运行,上下滤带间距逐渐减少,物料开始受到低压力,并随着滤带运行,压力逐渐增大,楔形区的作用是延长重力脱水时间, 增加絮团的挤压稳定性,为了进入压力区做准备。
4、挤压辊高压脱水段
通过楔形区、低压区、中压区、高压区和强力对辊挤夹,渣(泥)浆中的水份经过逐级增压的方式将物料内的间隙游离水被挤出,最后经过高压后滤饼的含水量可降至最低。通过刮料板刮离,上下滤带分开,经过高压冲洗水清除滤网表面孔隙中的微量颗粒,继续进入下一步脱水循环。

The sludge enters into the dynamic(static)state mixer through the mud pump,and is mixed with the concentration of 0.05-0.1% anion(cation)ion flocculent solution and fully reacted.Then the fine solid particles in the slag(mud)slurry(or suspended matter) coagulates into a bulky flocculent mass,and the bound water and surface water of the sludge is separated into free water.When the sludge is transported and spreaded on the filter line of the extended gravity pre-dewatering zone(or belt concentrator),free water permeates the back of the filter,it is oozed and separated under the action of gravity,forming non-flowing sludge.After reaching the pressing-dewatering zone,The sludge is subjected to the maximum pressure and clamped between the upper and lower mesh belts as the mesh belts moves.Then the rollers run slowly,and the sludge pass the filter belt which can adjust tension and are subjected to extrusion force and shear force by the rollers and the pressure roller whose diameter are gradually decrease and pressure is increase continuously.Water of the sludge is transported to the wedge zone,the low pressure zone,the medium pressure zone,the high pressure zone and the strong pressure zone,and is squeezed continuously with the increasing pressure.Finally the low moisture sludge cakes are discharged and scraped off by the scraper.The upper and lower filter belts are separated,and the small particles of sludge are cleaned up by high pressure water which blockes on the filter mesh.And then the machine will continue to the next dewatering cycle.

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