CN105439535B - 干化/半干化污泥理化性能调理剂、应用方法 - Google Patents
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Abstract
本发明公开了一种理化性能调理剂。针对现有技术中污泥理化性能与烧结砖基料存在差异,导致污泥烧结砖最终成品率低或者成品品质不佳的缺陷,本发明提供了一种干化/半干化污泥理化性能调理剂及其应用方法。本发明产品组分包括质量百分比的砂或白炭黑90%~95%、铝矾土粉4%~8%、烧碱0.5%~2%。产品通过改变砖坯料在烧结过程中化学组分反应过程与产物的结构形态,减少甚至消除污泥组分在烧结过程中对产品砖品质的不利影响,提高污泥烧结砖中的污泥掺加量。本发明还提供该理化性能调理剂在干化/半干化污泥烧结砖中的应用。本发明能够提高污泥建材化处置技术中污泥处置量,保证建材成品品质。产品加工成本低,操作工艺流程短、实施成本低,便于推广应用。
Description
技术领域
本发明涉及一种污泥调理剂,特别是涉及一种干化/半干化污泥理化性能调理剂及其使用方法,属于环境化工、污泥处置技术领域。
背景技术
市政污泥是污水处理的产物,主要来源于污水处理工艺的初次沉淀池、二次沉淀池等工艺环节。随着我国城镇污水处理率的不断提高,城镇污水处理厂污泥产量也急剧增加。据不完全统计,目前全国城镇污水处理厂污泥只有小部分进行卫生填埋、土地利用、焚烧和建材利用等,而大部分未进行规范化的处理处置。污泥含有病原体、重金属和持久性有机物等有毒有害物质,未经有效处理处置,极易对地下水、土壤等造成二次污染,直接威胁环境安全和公众健康,使污水处理设施的环境效益大大降低。因此市政污泥处理处置成为城市发展过程中急需解决的问题。
市政污泥包括处理与处置两个阶段。处理主要是指对污泥进行稳定化、减量化和无害化处理的过程。处置是指对处理后污泥进行消纳的过程,是污泥处理处置的终极目标。污泥是一种粘土质资源,污泥处置包括土地利用、焚烧、建材化利用、填埋等方式。污泥的建材化利用是市政污泥最终处置的理想方式之一,主要是指以污泥作为原料制造建筑材料,最终产物是可以用于工程的材料或制品。建材利用的主要方式有:污泥烧结制砖、污泥用于水泥熟料的烧制(即水泥窑协同处理处置)、污泥制陶粒等。
在污泥烧结制砖中干化/半干化污泥在砖坯中的掺入比一直是限制市政污泥持续稳定高效建材化利用处置的重要因素。在现有技术中,为了保证成品砖质量,含水率40%的干化/半干化污泥的掺入比一般限定在5%~15%之间。如建筑部2008年《城镇污水处理厂污泥处置制砖用泥质》行业标准CJ/T289-2008中,出于保证成品砖质量的考虑,建议污泥混合比例不超过10%(污泥含水率不超过40%)。同济大学环境科学与工程学院研发污泥预处理后按5%~10%与粘土混合(折算污泥含水率40%)烧制成砖技术,西安墙体材料研究设计院对城市污泥与页岩混合烧结多孔砖进行了半工业性试验、可行性及工艺研究,在其众多污泥制砖研究中,污泥掺加量均在5%~15%之间(折算污泥含水率40%)。同时后两者的数据还是仅在实验室条件下实现,尚未见公开实际生产中试规模以上试验报告。
现有的污泥烧结砖技术中,污泥掺加量较低的一个技术问题在于,污泥的理化性能,特别是与烧结砖相关的理化性能,与待掺混烧结砖基料(如煤矸石、页岩等)存在差异,在烧结砖过程中两类组分不能协同反应,产生组分化合与物理形变的差异。这种差异的影响随着污泥掺加量的增加而被放大,造成掺加了污泥的砖坯料与一般砖坯料相比,在烧砖过程中,随着温度升高砖坯料中的矿物质间发生的化学反应难控,结构物质体积密度降低、孔隙率增高、吸水率增高、抗压强度降低,最终成品率低,或者成品品质不能满足国家或行业标准。同时,受限于高污泥掺加量条件下的低成品率,污泥烧结砖处置方式始终无法克服市政污泥持续稳定产出量与污泥烧结砖需求量随市场波动之间的矛盾,使市政污泥处置项目不能高效持续运转,往往最终导致市政污泥烧结砖处置项目的失败。
发明内容
本发明的目的就是针对现有技术的不足,提供一种干化/半干化污泥理化性能调理剂及其应用方法,通过理化调理改变污泥化学组分及烧结过程中的结构物质形变,使污泥建材化处置技术中能够在污泥烧结砖成品率得以保证的前提下大幅提高污泥掺加量。
为实现上述目的,本发明首先提供一种干化/半干化污泥理化性能调理剂,其技术方案如下:
一种干化/半干化污泥理化性能调理剂,其特征在于:组分包括质量百分比的砂或白炭黑90%~95%、铝矾土粉4%~8%、烧碱0.5%~2%。
上述干化/半干化污泥理化性能调理剂在优选条件下,组分包括质量百分比的砂或白炭黑94%、铝矾土粉5%、烧碱1%。
市政污泥的含水率通常在97%~99.8%,干化/半干化污泥是指经处理后含水率一般约在30%~40%的市政污泥。但在专业领域内,干化/半干化污泥并非一个严格以含水率来区分的概念,其含水率可能略低30%或略高于40%,均不影响在污泥处理处置技术中将这类污泥视为干化/半干化污泥。
本发明干化/半干化污泥理化性能调理剂产品与干化/半干化市政污泥混合后,可以将污泥烧结砖原料的理化性能进行调整,使污泥主要理化性能表现为SiO2含量50%~70%,Al2O315%~20%,FeO33%~8%,CaO<10%,烧失量<15%,可塑性指数9~13,pH值呈碱性。这样在烧结砖焙烧过程中,随着温度升高,砖坯料中的矿物质逐渐发生分解、氧化物及碱性金属失去原有结构与SiO2、Al2O3结合,形成硅酸盐矿物;与此同时,易熔物形成液相熔融体,包裹未熔颗粒并填充颗粒间空隙,使体积密度增大,孔隙减少,吸水率降低,抗压强度提高。与干化/半干化污泥理化性能调理剂混合后的干化/半干化污泥在理化性能指标方面满足污泥建材化处置的标准,可以用于烧结砖、烧陶粒等后序建材化处置工艺要求。
基于干化/半干化污泥理化性能调理剂的作用原理与效果,本发明进一步提供上述干化/半干化污泥理化性能调理剂产品的应用方法,其技术方案如下:
上述干化/半干化污泥理化性能调理剂实现的干化/半干化污泥理化性能调理方法,其特征在于:是将干化/半干化污泥理化性能调理剂加入干化/半干化污泥,混匀。
本发明还提供上述干化/半干化污泥理化性能调理剂在干化/半干化污泥烧结砖中的应用。
进一步的技术方案是将干化/半干化污泥理化性能调理剂加入粉碎后的干化/半干化污泥,混匀,得干化/半干化污泥调理混合物料作为砖坯料组分。
上述应用方法所得的混合物料进一步添加烧结砖基料后作为砖坯料,经混合、破碎、搅拌均匀、陈化、烧结等烧结砖基本工序后得到成品烧结砖。烧结砖基料通常根据适地性原则采用煤矸石、页岩、粘土等。
与现有技术相比,本发明的有益效果是:(1)本发明干化/半干化污泥理化性能调理剂与干化/半干化污泥混合后,能够调节污泥理化性能,改变砖坯料在烧结过程中化学组分反应过程与产物的结构形态,从而减少甚至消除污泥组分在烧结过程中对产品砖密度、孔隙、吸水率、抗压强度的不利影响,提高污泥烧结砖中的污泥掺加量;在保证成品率98%且成品砖品质符合国家标准前提下,污泥掺加量最高可达40%,有效提高了污泥处置的效率。(2)本发明提供的干化/半干化污泥理化性能调理剂组分简单,化学反应少,有利于提高污泥的化学稳定性。(3)本发明干化/半干化污泥理化性能调理剂组分简单、常见、加工成本低,其使用方法操作工艺流程短、工艺标准易实现,实施成本低,便于推广。(4)在污泥烧结砖中试中采用本发明理化调理剂对城市生活污泥进行调理后,污泥原料可以适用于现有普通原料烧结砖的完整生产工艺,使烧结砖企业无需对现有生产线升级改造即可处置市政污泥。且成品砖相比于传统的页岩、煤矸石、粘土砖具有重量轻、节料、节煤、环保的特点。(5)本发明大幅提高了污泥烧结砖工艺中污泥掺加比,解决了污泥持续产生与烧结砖需求波动间的矛盾,在烧结砖市场需求量减小时,通过本发明提高污泥掺加比,保证污泥烧结砖处置项目能够持续稳定运行。
具体实施方式
下面结合优选实施例,对本发明的技术方案例作进一步的描述。
实施例一
制备一种干化/半干化污泥理化性能调理剂。
1、原料
砂
白炭黑:市售,SiO2含量98%以上
铝矾土粉:市售
烧碱:市售,工业级
2、制备
取各原料,依表1.1比例混合均匀,包装,得到干化/半干化污泥理化性能调理剂。
表1.1干化/半干化污泥理化性能调理剂组分配比(单位:质量百分比)
实施例二
实施例一所得干化/半干化污泥理化性能调理剂的使用。
1、原料
干化/半干化污泥理化性能调理剂:实施例一制得
干化/半干化污泥:干化/半干化污泥样,含水率不高于40%,粉碎,得干化/半干化污泥粉。
结烧砖基料:煤矸石、页岩。
2、干化/半干化污泥理化性能调理操作、砖坯料制备
将干化/半干化污泥理化性能调理剂加入各干化/半干化污泥粉样,混匀得干化/半干化污泥调理混合物料。调理剂加入量为干化/半干化污泥质量的5%~15%。再将干化/半干化污泥调理混合物料与烧结砖基料混合、破碎、搅拌均匀得砖坯料。其中,干化/半干化污泥调理混合物料占砖坯料质量百分比是25%~40%,烧结砖基料占砖坯料质量百分比75%~60%。砖坯料组分见表2.1。
同时,将未调理的干化/半干化污泥粉与烧结砖基料混合、破碎、搅拌均匀得对照砖坯料。其中,干化/半干化污泥占砖坯料质量百分比是25%~40%,烧结砖基料占砖坯料质量百分比75%~60%。
表2.1砖坯料组分(质量百分比)
3、烧结砖操作工艺
所得砖坯料经陈化、搅拌加水、挤压成型、切条切坯、码坯码垛、干燥、焙烧等烧结砖后续生产工序,得成品烧结多孔砖。成品率抽样检测结果见表2.2。
4、成品砖强度性能检测
成品砖指标以符合《烧结多孔砖和多孔砌块》(GB13544-2011)为标准,其强度等级指标及成品率检测结果见表2.2。检测结果显示,添加了本发明调理剂的污泥烧结砖成品率有大幅提升。
表2.2烧结砖成品检测率及成品砖强度检测
表3.1编号 | 成品率 | 强度等级 | 表3.1编号 | 成品率 | 强度等级 |
A1 | 96% | MU15 | C1 | 98% | MU15 |
A2 | 93% | MU10 | C2 | 96% | MU10 |
A3 | 90% | MU10 | C3 | 93% | MU10 |
B1 | 98% | MU15 | D1 | 69% | ---- |
B2 | 95% | MU15 | D2 | 57% | ---- |
B3 | 93% | MU10 | D3 | 46% | ---- |
Claims (8)
1.干化/半干化污泥理化性能调理方法,其特征在于:是用于干化/半干化污泥烧结砖工艺,将干化/半干化污泥理化性能调理剂加入干化/半干化污泥,混匀,得干化/半干化污泥调理混合物料作为砖坯料组分;所述干化/半干化污泥理化性能调理剂组分包括质量百分比的砂或白炭黑90%~95%、铝矾土粉4%~8%、烧碱0.5%~2%。
2.根据权利要求1所述的调理方法,其特征在于:所述干化/半干化污泥理化性能调理剂组分包括质量百分比的砂或白炭黑94%、铝矾土粉5%、烧碱1%。
3.根据权利要求1或2所述的方法,其特征在于:所述干化/半干化污泥理化性能调理剂加入量是干化/半干化污泥质量的5%~15%。
4.根据权利要求3所述的方法,其特征在于:所述干化/半干化污泥含水率不高于40%。
5.根据权利要求3所述的方法,其特征在于:将所述干化/半干化污泥调理混合物料与烧结砖基料混合、破碎、搅拌均匀后作为砖坯料,经烧结砖后续生产工序得成品烧结砖;所述烧结砖基 料是煤矸石和/或页岩和/或粘土。
6.根据权利要求4所述的方法,其特征在于:将所述干化/半干化污泥调理混合物料与烧结砖基料混合、破碎、搅拌均匀后作为砖坯料,经烧结砖后续生产工序得成品烧结砖;所述烧结砖基 料是煤矸石和/或页岩和/或粘土。
7.根据权利要求5或6所述的方法,其特征在于:所述干化/半干化污泥调理混合物料占砖坯料质量的25%~40%。
8.根据权利要求5或6所述的方法,其特征在于:所述干化/半干化污泥理化性能调理剂加入量是干化/半干化污泥质量的10%。
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