CN114835530A - 一种有机污泥的蚯蚓堆肥处理方法 - Google Patents
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Abstract
本发明公开了一种有机污泥的蚯蚓堆肥处理方法,以翻堆方式向有机污泥通气20~30天;将培养土与有机污泥按照一定重量比混合形成混合培养土,并将混合培养土含水率调整至80~85%;将蚯蚓引入混合培养土中,蚯蚓引入量与混合培养土的重量比为1000:25的重量比,混合培养土污泥温度控制在20~25℃;每隔几天松土1次,将混合培养土含水率控制在70~80%,混合培养土温度维持在20~25℃;此批混合培养土蚯蚓堆肥处理完毕后,将蚯蚓取出,用于下一批蚯蚓堆肥处理。本发明能够将有机污泥由有机状态转化至符合有机肥料标准,实现废物资源化,同时能够维持蚯蚓的有效生长。
Description
技术领域
本发明涉及有机污泥处理技术领域,尤其是一种有机污泥的蚯蚓堆肥处理方法。
背景技术
污泥特性根据生产纸别种类有所区别,主要由纤维、有机物、无机盐类、水组成。纤维来自于废料及抄纸系统流失,有机物则来自废弃生物污泥及有机化工原料,无机盐类来自于废纸中的无机成分、无机化工原料(碳酸钙涂料)及化学药剂(纸面上胶剂硫酸铝等)。污泥中的纤维、有机物及无机成分的比例直接关系到再利用程度,无机成分高则适合作为水泥原料,有机成分为主(简称有机污泥)则以废弃为主。
常见有机污泥的处置、处理以及回收再利用技术有掩埋法、热裂解法、干燥法及堆肥法。掩埋法操作简单且成本极低,污泥不需要经过高度脱水处理,但受到土地空间限制;热裂解法具有一定的经济性,但需消耗大量能源,中途亦会产生氮氧化物NOX,造成空气污染等相关环境问题;干燥法以翻堆干燥技术去除污泥中的水分,但无法有效去除其中的有机物质;堆肥法堆肥处理,通过好氧通气方式,利用微生物分解、转化有机污泥所含的易腐败之挥发性有机质,但对于含重金属的纸浆污泥效果甚微。
蚯蚓堆肥,又称为蚯蚓生物稳定化,通过蚯蚓及环境中微生物的协同作用,能够有效处理污泥及有机固体废弃物的生物降解技术,不仅提高污泥再利用价值,更能有效稳定化土壤重金属浓度,创造出适合植物生长的环境。然而,直接将蚯蚓引入有机污泥中,较大概率会导致其死亡,现有技术中都是通过增加蚯蚓的投入量以解决此问题。
发明内容
针对蚯蚓堆肥工艺中直接将蚯蚓引入有机污泥中存在的蚯蚓死亡率偏高的问题,本发明提出一种有机污泥的蚯蚓堆肥处理方法。
一种有机污泥的蚯蚓堆肥处理方法,包括以下步骤:
步骤1,以翻堆方式向有机污泥通气20~30天;
步骤2,将培养土与有机污泥按照重量比1~3:3~1混合形成混合培养土,并将混合培养土含水率调整至80~85%;
步骤3,将蚯蚓引入混合培养土中,蚯蚓引入量与混合培养土的重量比为1000:25的重量比,混合培养土污泥温度控制在20~25℃;
步骤4,每隔几天松土1次,将混合培养土含水率控制在70~80%,混合培养土温度维持在20~25℃;
步骤5,此批混合培养土蚯蚓堆肥处理完毕后,将蚯蚓取出,用于下一批蚯蚓堆肥处理。
优选的,通气比0.2~0.3vvm。
优选的,蚯蚓引入混合培养土前,在温度20~25℃,含水率80~85%的土壤中养殖30天以上。
优选的,蚯蚓取出后,继续对处理后的混合培养土翻堆处理并持续以0.2~0.3vvm的通气比通气24小时以上。
优选的,培养土的碳氮比值大于10。
本发明能够将有机污泥由有机状态转化至符合有机肥料标准,实现废物资源化,同时能够维持蚯蚓的有效生长;与此同时,可以使得培养土中的NPK达到有机肥料的标准,并降低其中的汞浓度。
附图说明
图1为有机污泥的蚯蚓堆肥处理方法示意图。
具体实施方式
下面结合附图和具体实施方式对本发明作进一步详细的说明。本发明的实施例是为了示例和描述起见而给出的,而并不是无遗漏的或者将本发明限于所公开的形式。很多修改和变化对于本领域的普通技术人员而言是显而易见的。选择和描述实施例是为了更好说明本发明的原理和实际应用,并且使本领域的普通技术人员能够理解本发明从而设计适于特定用途的带有各种修改的各种实施例。
实施例1
一种有机污泥的蚯蚓堆肥处理方法,如图1所示,包括以下步骤:
1、蚯蚓在温度20~25℃,含水率80~85%的土壤中养殖30天以上,土壤温度控制在20~25℃,含水率控制在80~85%,蚯蚓较为适应,不会因不适应环境而爬出;
2、以翻堆方式向有机污泥通气20~30天,通气比0.2~0.3vvm,优选0.25vvm,以减少污泥发酵产生的有机气体;
3、将培养土(碳氮比值大于10)与有机污泥按照重量比1~3:3~1混合形成混合培养土,并将混合培养土含水率调整至80~85%;
4、将蚯蚓引入混合培养土中,蚯蚓引入量与混合培养土的重量比为1000:25的重量比,混合培养土污泥温度控制在20~25℃;
5、每隔几天松土1次,优选10天,将混合培养土含水率控制在70~80%,混合培养土温度维持在20~25℃;
6、此批混合培养土蚯蚓堆肥处理完毕后,将蚯蚓取出,用于下一批蚯蚓堆肥处理。
7、蚯蚓取出后,继续对处理后的混合培养土翻堆处理并持续以0.2~0.3vvm的通气比通气24小时以上,以确保土壤含水率低至40%,减少测试误差。
下面以纺织污泥为处理对象,分组(1组对比例和3组实施例)进行对比测试,其中对比例是采用国家知识产权局2021年8月10日公告的发明专利申请CN113233925A公开的蚯蚓堆肥方法对纺织污泥进行处理,实施例1是按照3:1的重量比混合纺织污泥和培养土,实施例2是按照1:1的重量比混合纺织污泥和培养土,实施例3是按照1:3的重量比混合纺织污泥和培养土,测试结果如下表1所示。
表1
从表1可以看出,采用现有蚯蚓堆肥方法对纺织污泥进行处理时,蚯蚓的存活率仅有36%,并且蚯蚓堆肥处理后的纺织污泥中NPK仍然基本没有变化。重金属砷含量虽然有所降低,但是处理效果不是很理想;重金属汞反而有所增加,是因为汞元素原本分散于土壤中,蚯蚓转化导致汞金属富集。
反观实施例1-3,蚯蚓的存活率均为90%以上,当培养土重量超出纺织污泥时,存活率可达100%;在重金属处理方面,效果也显著优于对比例,尤其是在砷、汞处理上,能够直接达到未检出的程度,满足有机肥料新标准NYT525-2021。实施例1-3中的混合培养土中的汞含量高于纺织污泥,是因为培养土中常规含有一定量的汞。
综上,本发明能够将有机污泥由有机状态转化至符合有机肥料标准,实现废物资源化,同时能够维持蚯蚓的有效生长;与此同时,可以使得培养土中的NPK达到有机肥料的标准,并降低其中的汞浓度。
显然,所描述的实施例仅仅是本发明的一部分实施例,而不是全部的实施例。基于本发明中的实施例,本领域及相关领域的普通技术人员在没有作出创造性劳动的前提下所获得的所有其他实施例,都应属于本发明保护的范围。
Claims (5)
1.一种有机污泥的蚯蚓堆肥处理方法,其特征在于,包括以下步骤:
步骤1,以翻堆方式向有机污泥通气20~30天;
步骤2,将培养土与有机污泥按照重量比1~3:3~1混合形成混合培养土,并将混合培养土含水率调整至80~85%;
步骤3,将蚯蚓引入混合培养土中,蚯蚓引入量与混合培养土的重量比为1000:25的重量比,混合培养土污泥温度控制在20~25℃;
步骤4,每隔几天松土1次,将混合培养土含水率控制在70~80%,混合培养土温度维持在20~25℃;
步骤5,此批混合培养土蚯蚓堆肥处理完毕后,将蚯蚓取出,用于下一批蚯蚓堆肥处理。
2.根据权利要求1所述的有机污泥的蚯蚓堆肥处理方法,其特征在于,通气比0.2~0.3vvm。
3.根据权利要求1所述的有机污泥的蚯蚓堆肥处理方法,其特征在于,蚯蚓引入混合培养土前,在温度20~25℃,含水率80~85%的土壤中养殖30天以上。
4.根据权利要求1所述的有机污泥的蚯蚓堆肥处理方法,其特征在于,蚯蚓取出后,继续对处理后的混合培养土翻堆处理并持续以0.2~0.3vvm的通气比通气24小时以上。
5.根据权利要求1所述的有机污泥的蚯蚓堆肥处理方法,其特征在于,培养土的碳氮比值大于10。
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CN106316584A (zh) * | 2016-08-11 | 2017-01-11 | 同济大学 | 处理剩余污泥的方法及剩余污泥处理装置 |
CN113233925A (zh) * | 2021-05-17 | 2021-08-10 | 贵州富乾生态农业科技有限公司 | 一种蚯蚓处理污泥的方法 |
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