CN113603334A - 一种采用富碳调理剂联合提高城市污泥脱水效率的方法 - Google Patents

一种采用富碳调理剂联合提高城市污泥脱水效率的方法 Download PDF

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CN113603334A
CN113603334A CN202111113259.3A CN202111113259A CN113603334A CN 113603334 A CN113603334 A CN 113603334A CN 202111113259 A CN202111113259 A CN 202111113259A CN 113603334 A CN113603334 A CN 113603334A
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cpam
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孙敏
李伟杰
刘国强
余江辉
韩玉坤
王宪章
翟林峰
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Hefei University of Technology
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Abstract

本发明涉及一种采用富碳调理剂联合提高城市污泥脱水效率的方法，采用生物质热解液态产物木醋液、煤粉和阳离子聚丙烯酰胺(CPAM)三种富碳药剂对城市污泥进行联合调理，有效提高了城市污泥的脱水效率，使脱水后泥饼含水率低于55％，污泥泥饼的燃烧烧失量提高了20.14％，燃烧热值增加了4.56％，从而不仅有效减少污泥后续资源化和减量化处理工艺的能耗，而且有利于提高污泥燃烧的稳定性和发热量。

Description

一种采用富碳调理剂联合提高城市污泥脱水效率的方法
技术领域
本发明涉及一种采用富碳调理剂联合提高城市污泥脱水效率的方法，通过加入生物质热解液态产物木醋液、煤粉和阳离子聚丙烯酰胺三种富碳药剂对城市污泥进行联合调理，并通过物理压榨，进一步提高污泥脱水效率和泥饼的热值。
背景技术
城市污泥是城市污水处理厂处理污水后产生的一种有机质含量占其干基质量50％以上的、含有复杂重金属和致病菌的具有可资源化利用价值的生物固体废弃物。污泥(干基)低位热值接近于煤，可以作为燃料或与其它辅助燃料混合掺烧，实现资源化处理。污泥单独燃烧，存在着能耗和设备要求高及燃烧不稳定等问题。在污泥中加入其它辅助燃料合成污泥衍生燃料，不仅可以改善其燃烧的稳定性，又可以提高发热量，是污泥资源化利用的理想途径。
在城市污泥处理和处置的过程中，城市污泥含水率高的特点会对污泥处理处置具有很大的影响。城市污水污泥的含水率一般在90％以上，高含水率会显著增加污泥体积，从而对污泥的后续储存、输送、处理、处置及燃烧热值等产生不利影响，必须对其进行深度脱水处理，以减少污泥体积，并降低后续处理的成本。因此，寻找开发低成本、高效率的富碳化学调理药剂与调理方法，是有效提高污泥脱水率和燃烧热值的关键技术之一。
发明内容
本发明针对上述现有技术所存在的问题，提供了一种采用富碳调理剂联合提高城市污泥脱水效率的方法。本发明将富碳药剂木醋液、煤粉和CPAM联合应用于城市污泥调理，利用木醋中的有机成分使煤粉和污泥颗粒中的金属化合物以离子形式溶出，使得污泥表面的电性得到中和，从而有利于与有机高分子絮凝剂CPAM形成架桥和絮凝。另外，煤粉的加入有利于后续物理压榨过程中起到骨架支撑作用，进一步提高污泥的脱水效率和热值。
本发明提高城市污泥脱水效率和热值的富碳调理方法，包括如下步骤：
向含水率为98％的城市污泥中加入适量木醋液和煤粉，以350rpm的转速搅拌反应一定时间后再加入CPAM，继续搅拌5min后将搅拌速度降至100rpm，10min后停止搅拌；将絮凝沉淀后的污泥转入板框压滤机进行压榨脱水，当板框内污泥达到一定压力后保压直至不再有滤液流出。
所述木醋液来自于生物质热解产物，水含量为80％，pH为2.85，按干污泥(DS)计，其用量为0.5～7.5kg/kgDS。
所述煤粉来源于粒径小于80目的水泥窑用烟煤，平均热值为24398.90J/g，其用量为20～150g/kgDS。
加入木醋液和煤粉后的搅拌时间为10～30min。
所述CPAM的重均分子量为1000～1200万，离子度为20～60％，其用量为1.5～4.5g/kgDS，使用前配置成浓度为0.2wt％溶液。
板框保压的压力值为1～3MPa，保压时间为20～60min。
与已有技术相比，本发明的有益效果体现在：
1、本发明选用生物质热解液态产物木醋液、煤粉和CPAM作为城市污泥的化学调理剂，同时提高了污泥的脱水效率和泥饼的热值。
2、本发明选用木醋液和煤粉联合添加，可促进煤粉和污泥中固态金属离子的溶出，从而无需投加无机混凝剂。
3、本发明选用的木醋液可对污泥泥饼起到一定的消臭和杀菌作用，有利于泥饼的堆置存放和后续处理。
附图说明
图1为实施例1条件下，不同调理剂对污泥比阻的影响。可以看出三种调理剂对污泥比阻的减小存在协同促进作用。
图2为实施例条件下，不同调理剂对压榨后泥饼含水率的影响。可以看出三种调理剂对泥饼含水率的减小存在协同促进作用。
图3为原污泥与实施例1联合调理后污泥泥饼的TGA(a和c)和DSC数据(b和d)。由图可知，联合调理后的污泥失重率大于原污泥，燃烧烧失量由40.47％升至48.62％，表明其有机组分明显得到了提高。通过对污泥的时间(s)-DSC(mW/mg)曲线进行积分计算，所得积分面积即污泥燃烧热值，可以看出，实施例1中经三种调理剂联合调理后的污泥燃烧热值较原污泥增加了286.5J/g。
具体实施方式
实施例1：
量取400L含水率为98％的城市污泥，加入2.5kg/kgDS的木醋酸和污泥干重100g/kgDS的煤粉，以350rpm的转速下对污泥进行搅拌25min，再加入1.5g/kgDS分子量为1000万的CPAM(离子度为60％)后继续搅拌5min，然后在100rpm下搅拌10min。取400mL絮凝后的污泥测量污泥比阻，其他混合物转入板框压滤机对其进行压滤脱水，当板框压滤达到2MPa时停止加压，并保压30min。絮凝后污泥的污泥比阻为5×1010m/kg，滤饼含水率达48.2％，污泥泥饼的燃烧热值6562.65J/g。
实施例2：
量取300L含水率为98％的城市污泥，加入0.5kg/kgDS的木醋酸和污泥干重150g/kgDS的煤粉，以350rpm的转速下对污泥进行搅拌10min，再加入4.5g/kgDS分子量为1000万的CPAM(离子度为20％)后继续搅拌5min，然后在100rpm下搅拌10min。取400mL絮凝后的污泥测量污泥比阻，其他混合物转入板框压滤机对其进行压滤脱水，当板框压滤达到1Mpa时停止加压，并保压20min。絮凝后污泥的污泥比阻为1.2×1011m/kg，滤饼含水率达52.8％，污泥泥饼的燃烧热值6494.97J/g。
实施例3：
量取500L含水率为98％的城市污泥，加入7.5kg/kgDS的木醋酸和污泥干重20g/kgDS的煤粉，以350rpm的转速下对污泥进行搅拌25min，再加入2.5g/kgDS分子量为1000万的CPAM(离子度为40％)后继续搅拌5min，然后在100rpm下搅拌10min。取400mL絮凝后的污泥测量污泥比阻，其他混合物转入板框压滤机对其进行压滤脱水，当板框压滤达到3Mpa时停止加压，并保压60min。絮凝后污泥的污泥比阻为1.5×1011m/kg，滤饼含水率达50.7％，污泥泥饼的燃烧热值6460.33J/g。

Claims (6)

1.一种采用富碳调理剂联合提高城市污泥脱水效率的方法，其特征在于：
通过加入生物质热解液态产物木醋液、煤粉和CPAM三种富碳药剂对城市污泥进行联合调理，并通过物理压榨，进一步提高污泥脱水效率和泥饼的热值。
2.根据权利要求1所述的方法，其特征在于包括如下步骤：
向含水率为98％的城市污泥中加入适量木醋液和煤粉，以350rpm的转速搅拌反应一定时间后再加入CPAM，继续搅拌5min后将搅拌速度降至100rpm，10min后停止搅拌；将絮凝沉淀后的污泥转入板框压滤机进行压榨脱水，当板框内污泥达到一定压力后保压直至不再有滤液流出。
3.根据权利要求2所述的方法，其特征在于：
所述木醋液来自于生物质热解产物，水含量为80％，pH为2.85，按干污泥DS计，用量为0.5～7.5kg/kgDS。
4.根据权利要求2所述的方法，其特征在于：
所述煤粉来源于粒径为小于80目的水泥窑用烟煤，平均热值为24398.90J/g，用量为20～150g/kgDS。
5.根据权利要求2所述的方法，其特征在于：
所述CPAM的重均分子量为1000～1200万，离子度为20～60％，用量为1.5～4.5g/kgDS，使用前配置成浓度为0.2wt％溶液。
6.根据权利要求2所述的方法，其特征在于：
板框保压的压力值为1～3MPa，保压时间为20～60min。
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CN109626533A (zh) * 2019-01-28 2019-04-16 辽宁盛基建设基础工程有限公司 水处理复合制剂及其制备方法和使用方法
CN110240386A (zh) * 2019-07-11 2019-09-17 中国科学院城市环境研究所 一种秸秆与污泥协同处理的装置及其方法
WO2020097786A1 (en) * 2018-11-13 2020-05-22 Suez Water Treatment Company Limited A sludge treatment method

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JPS6038100A (ja) * 1983-08-10 1985-02-27 Dai Ichi Kogyo Seiyaku Co Ltd 脱臭脱水剤
CN103193374A (zh) * 2013-05-03 2013-07-10 湖南品铸科技发展有限公司 一种污泥脱水调质剂及其污泥脱水的方法
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