聚合氯化铝在高脱水率造纸污泥处理中的应用研究
2018-10-21晏永祥李帮汉宋福升陈启杰王庆峰
晏永祥 李帮汉 宋福升 陈启杰 王庆峰
摘要:简述造纸污泥含水率和体积的变化关系,分析其基本性质,实验加入04 g氧化铝含量为10%的聚合氯化铝(PAC)和5 g浓度为02%的阳离子聚丙烯酰胺(CPAM)可有效处理200 g固含量为20%的造纸污泥,中试结论与实验结果一致。结果表明,新工艺采用DCS控制的二级脱水方式,先利用浓缩塔将污泥固含量提高到4%~6%之间,再通过柱塞泵送入800 m2板框压滤机进行二级脱水,脱水污泥干度可达50%以上;单台设备每个周期4 h可处理45 t绝干污泥,破碎后掺煤焚烧每吨绝干污泥可产生余热29256 MJ,能直接产生经济效益61元;与传统工艺相比可节约139%的运行费用。
关键词:聚合氯化铝;理化性质;高脱水率;焚烧
中图分类号:X793文献标识码:ADOI:1011980/jissn0254508X201803002
收稿日期:20171116(修改稿)
*通信作者:李帮汉,在读硕士研究生;研究方向:造纸废水处理。Application of PAC in Papermaking Sludge Treatment YAN Yongxiang1,2LI Banghan1,2,*SONG Fusheng3CHEN Qijie1 WANG Qingfeng2
(1 Changsha University of Science and Technology,Changsha, Hunan Province,410114;
2 BaiLin Biotechnology Co, Ltd, Changsha,Hunan Province,410205;
3 YueyangFengli Paper Co, Ltd, Yueyang, Hunan Province, 414100)
(*Email: 657100530@qqcom)
Abstract:The relationship between the change of water content and volume change of papermaking sludge was briefly described and analyzed From engineering point of view, adding 04 g PAC with 10% alumina content and 5 g CPAM with 02% solid content could effectively treat 200 g paper sludge with concentration of 2% The new process used concentration conditioning pool, the sludge concentration could be increased to 4%~6% Then the sludge was pumped to frame filter press by using a plunger pump, the dryness of dehydrated sludge could be up to 50% or even higher A single device could handle 45 tons of oven dry sludge per working cycle(4 hours)The dried sludge could be used as fuel after being crushed and mixed with coal, per ton of dried sludge could produce heat 29256 MJ through incineration, which could directly produce economic benefits of RBM 61 yuan; It could save 139% operating costs compared to the traditional process
Key words:polyaluminum chloride; physicochemical properties; high dehydration rate; incineration
造纸工业是国民经济六大支柱产业之一,与国民经济发展和社会文明建设息息相关。伴随着纸张的生产,会产生大量的造纸污泥,其含水率高,成分复杂,处理难度大。据统计,每生产1 t纸,就会产生含水率65%左右的污泥约700 kg[1]。目前造纸污泥主要的处理方式有填埋、厌氧消化稳定、好氧堆肥、生物沥浸、污泥石灰稳定和污泥干热化及污泥焚烧等,还包括制造造纸填料、制造活性炭、生产乙酸乙醇等其他利用技术[2]。受工艺、设备、场地大小,经费投入以及近年来的发展趋势和客户选择等因素的影响,选用化学调理[3]是目前国内较为主流的处理工艺。在湖南岳陽丰利纸……
