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1、The study on heating add acid and alkali improving sewage treatmentplant sludge dewatering effectsbyYU PeiBE(Hunan City UniVersity)2009A thesis submitted in partial satisfaction of theRequirements for the degree ofMaster of EngineeringArchitectural and Civil EngineeringGraduate SchoolofHunan Univers
2、itySupervisorProfessor YU Jian and senior engineer YAO ZhiqiangJune，2011M6洲02洲80川9川-舢Y湖南大学学位论文原创性声明本人郑重声明：所呈交的论文是本人在导师的指导下独立进行研究所取得的研究成果。除了文中特别加以标注引用的内容外，本论文不包含任何其他个人或集体已经发表或撰写的成果作品。对本文的研究做出重要贡献的个人和集体，均已在文中以明确方式标明。本人完全意识到本声明的法律后果由本人承担。作者签名： 日期：渊7年，月引日学位论文版权使用授权书本学位论文作者完全了解学校有关保留、使用学位论文的规定，同意学校保留并向国家
3、有关部门或机构送交论文的复印件和电子版，允许论文被查阅和借阅。本人授权湖南大学可以将本学位论文的全部或部分内容编入有关数据库进行检索，可以采用影印、缩印或扫描等复制手段保存和汇编本学位论文。本学位论文属于1、保密口，在年解密后适用本授权书。2、不保密囹。(请在以上相应方框内打“”)作者签名：昏纠铲 日期：砂，J年，月弓1日导师签名：台-他“径复；日期：20年罗月弓f日加热加酸碱提高污水处理厂脱水效果的试验研究摘 要污泥机械脱水的难点在于部分结合水的去除，加热加酸碱作为污泥机械脱水前预处理方法，能有效的释放污泥内部的结合水，使污泥自由水的比例升高，从而达到很好的预处理目的。同时加热加酸碱能有效的
4、破解污泥细胞。本文研究了热处理对剩余污泥脱水性能的影响，以离心30min后泥饼的含水率衡量污泥的可脱水程度，以污泥比阻(SRT)衡量污泥的过滤速度。实验结果表明，随着温度的升高，污泥的可脱水程度增大，污泥比阻降低。在160的条件下水解之后，泥饼的含水率可从原泥离心后的723降至61，比阻从521x1012mkg降至179x1012mkg。VSS随热水解温度的升高和时间的延长不断增大，在160热水解90min之后溶解率上升到7535。对于污泥离心之后的滤出液，SCOD随温度的升高时间的延长不断增大，在160热水解90min后SCOD浓度达到457417mgL，氨氮、总氮浓度也随温度的上升而加大，
5、在150水解后氨氮的浓度达到15284mgL，总氮在160C水解后达到53318mgl，相比原污泥的滤出液分别增加了8390mgL、46409mgL。pH和碱度随热水解温度的升高缓慢的下降。酸碱处理都能使污泥中水分的分布发生改变，改善污泥脱水性能。实验结果表明，酸碱处理对污泥脱水程度、过滤速度提高不明显，pH=l、pH=13的情况下泥饼的含水率分别为69和70，酸预处理后污泥的可脱水程度略高于碱预处理。滤出液的SCOD都呈上升的趋势。酸处理后在pH-3时SCOD达到最大，为28885mgL：碱处理后在pH=13时SCOD急剧上升，达到56829mgL。总氮和氨氮也呈上升趋势，在pH=13时总氮
6、的值达到最大，为10596mgL，在pH=3时氨氮的值达到最大，为8519mgL。本实验研究了pH=l酸处理后，在不同温度下剩余污泥的水解60min的情况。酸预处理之后再通过热处理，可以在较低的温度同样达到释放污泥颗粒内部水分的作用。在120热酸预处理后对污泥的可脱水程度大大的提高，泥饼的含水率已下降至58，达到实验研究的目的。160热酸处理后泥饼的含水率为47，相比单独热水解后泥饼的含水率下降了1302。热酸处理后的滤出液水质比热水解处理之后的要好。通过正交实验，得出三个因素对污泥脱水程度和脱水速率的影响，三个因素的重要性依次为pH、温度、时间。关键词g剩余污泥；脱水性能；热处理；酸碱处理；
7、热酸处理：含水率工程硕士学位论文AbstractMechanical dewatering of sludge is part of the difficulty with the removal ofwater，heating add acid and alkali as a pretreatment method for mechanical dewateringof sludge，which can effectively release bound water within the sludge，the sludgeincreased the proportion of free wa
8、ter to achieve a good pre-purposesHeating addacid and alkali can also break the sludge cellsThis paper studies the heat treatment on the influence of sludge dewateringpropertiesAfter centrifugation in a long time the moisture content of sludge cake canbe measured by the degree of dehydration of slud
9、ge，with sludge specific resistance toflitration(SRT)of the sludge filtering speed measureThe results show that withincreasing temperature，the sludge can increase the degree of dehydration，and SRTdecreaseUnder the temperature at 160C of hydrolysis，the sludge cake moisturecontent can be decreased from
10、 723of the original mud aftei centrifugation to 61，SRT decreased from 521x1012mkg t0179x1012mkgVSS solution with the watertemperature and time increasing，after 90min heat hydrolysis in 1 60dissolving raterose to 7535After about sludge centrifugal filter out fluid，SCOD with temperatureincreases the e
11、xtension of time is continuously increasing，and in 1 60heathydrolysis 90rain SCOD concentrations reach 457417 mgL，ammonia nitrogen，totalnitrogen concentration increases with temperature rise large，after hydrolysis at 1 50Cthe concentration of ammonia reach 15284mgL,total nitrogen after hydrolysis at
12、160C to 53318mgL,coMPared to the original sludge filtrate increased by8390mgL,46409mgLPH and alkalinity with heat hydrolysis temperature elevatoryslow declineAcid and alkali sludge can make changes in the distribution of water，improvesludge dewatering propertiesExperimental results show that the deg
13、ree of acid andalkali treatment on the sludge dewatering，filtration speed is not obvious，in the caseof pH=l，pH=13 the moisture content of cake were 69and 70，after pretreatmentof acid sludge dewatering slightly higher than the alkali pretreatment degreeSCOD offiltrate are up in the trendAcid treatmen
14、t in the pH=3，maximum SCOD for 28885mgL；alkali pH=13 after the sharp increase in SCOD to 56829mgLTotal nitrogen andammonia nitrogen also showed an upward trend，in the pH=13 maximum value of TNfor 10596mgL，ammonia nitrogen at pH=3，the maximum value for 8519mgLIll加热加酸碱提高污水处理厂脱水效果的试验研究This experimental
15、 study of the pH=l acid treatment，sludge at differenttemperatures of hydrolysis 60min situationBy heat treatment after acid pretreatment，can be in relatively low temperature also achieve the sludge particles released internalmoisture roleAt 120。C hot acid pretreatment degree of dehydration of sludge
16、 can begreatly improved，the moisture content of cake has fallen to 58，to experimentalresearch purposes1 60*C hot acid treatment of the water content of sludge cake was47，respectively，coMPared to water solution alone，after the moisture content ofcake down 1302Hot acid treatment of the filtrate water quality better than afterheat hydrolysis tr
