CN112174467A - 一种蓝藻藻泥资源化处理方法 - Google Patents

一种蓝藻藻泥资源化处理方法 Download PDF

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CN112174467A
CN112174467A CN202010921911.3A CN202010921911A CN112174467A CN 112174467 A CN112174467 A CN 112174467A CN 202010921911 A CN202010921911 A CN 202010921911A CN 112174467 A CN112174467 A CN 112174467A
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杨汉文
李冲
王瑞
陈安怡
李莉霞
彭依琳
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Wuxi Guolian Environmental Science & Technology Co ltd
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Abstract

本发明提供了一种蓝藻藻泥资源化处理方法,其能解决现有蓝藻藻泥处理方法获得的泥饼热值低以及滤液水处理中遇到的活性污泥微生物活性低、处理时间长、处理难度大等问题。一种蓝藻藻泥资源化处理方法,其特征在于,方法包括依次进行的以下步骤:物料混合、热水解和脱水;物料混合步骤包括将蓝藻藻泥和农林废弃物进行混合,蓝藻藻泥的含水率85%~95%,农林废弃物的添加量为蓝藻藻泥干物质重量的5%~30%;热水解步骤不添加化学药剂并且反应温度不低于180℃。本发明的蓝藻藻泥资源化处理方法,与原有方法,即传统的化学药剂调理后高干脱水方法相比,两者泥饼含水率相当,但本发明方法的泥饼干基热值更高。

Description

一种蓝藻藻泥资源化处理方法
技术领域
本发明属于蓝藻藻泥资源化处理技术领域,具体涉及一种蓝藻藻泥资源化处理方法。
背景技术
2007年太湖水污染事件引发舆论广泛关注,时至今日,太湖水质较2007年虽已有大幅改善,但整体还是处于富营养化状态。巢湖、滇池等大型内陆湖泊,也长期处于富营养化状态。由于事关沿岸百姓饮用水安全,富营养化湖泊治理成为了沿岸各地政府面对的重大课题。
蓝藻打捞是近年来在太湖沿岸使用较多的应对措施,蓝藻经打捞后浓缩成蓝藻藻泥。无锡地区打捞的蓝藻藻泥添加石灰、铁盐调质后进行脱水,脱水泥饼经干化后进行焚烧。由于大量调质药剂的添加,在一定程度上降低了脱水泥饼的热值,同时,由于滤液需要处理以达到相关标准才能进行排放,在滤液水处理过程中,高盐度对活性污泥微生物的生长有着明显的抑制作用,增加了水处理的难度,延长了水处理的周期。
发明内容
本发明提供了一种蓝藻藻泥资源化处理方法,其能解决现有蓝藻藻泥处理方法获得的泥饼热值低以及滤液水处理中遇到的活性污泥微生物活性低、处理时间长、处理难度大等问题。
其技术方案是这样的,一种蓝藻藻泥资源化处理方法,其特征在于,所述方法包括依次进行的以下步骤:物料混合、热水解和脱水;
所述物料混合步骤包括将蓝藻藻泥和农林废弃物进行混合,所述蓝藻藻泥的含水率85%~95%,所述农林废弃物的添加量为蓝藻藻泥干物质重量的5%~30%;
所述热水解步骤不添加化学药剂并且反应温度不低于180℃。
进一步的,所述农林废弃物包括但不限于秸秆粉、稻壳粉、玉米芯粉、米糠、竹粉、锯末,所述农林废弃物的粒径≤5mm。
进一步的,所述热水解步骤的反应热源为蒸汽,反应温度为180℃~230℃,反应时间为0.5h~3h。
进一步的,所述脱水采用板框压滤机。
本发明的蓝藻藻泥资源化处理方法,与原有方法,即传统的化学药剂调理后高干脱水方法相比,两者泥饼含水率相当,但本发明方法的泥饼干基热值更高;同时,由于本发明未添加化学药剂进行调质,滤液盐度低,活性污泥微生物活性高、处理时间短。
具体实施方式
实施例1
一种蓝藻藻泥资源化处理方法,包括以下步骤:
S1、物料混合,将无锡七里堤打捞点打捞浓缩后含水率为85%的蓝藻藻泥15t,与0.45t(占藻泥干重20%)、粒径≤5mm稻壳粉混合;
S2、热水解,将蓝藻藻泥和稻壳粉的混合物料在反应釜中进行热水解反应,反应温度200℃,反应时间2h,其中,反应釜未对压力进行设定;
S3、脱水,将热水解后的混合物料经板框压滤机进行固液分离,所得泥饼含水率48%,固渣干基热值3500 cal/g,所得滤液水经污水处理设施处理后达到纳管排放标准(GB/T31962-2015)的A级要求,进行排放。
其中,滤液水经污水处理设施处理具体包括以下步骤:
1、产生的滤液水通过管道排入调节池,调节池的主要作用是调节待处理废水流量以控制后续水处理构筑物的负荷。
2、待处理废水通过调节池后进入厌氧反应器,在反应器中厌氧颗粒污泥作用下,有机物被部分分解为CH4和CO2,气体经收集后回收利用,处理出水有机物浓度降低,转入下一个处理环节。
3、从厌氧反应器出来的处理水进入A/O反应器,A/O反应器在去除废水中有机物的同时,还能起到脱氮的作用。废水在厌氧、好氧的环境中交替循环,完成去除有机物和脱氮的过程。
4、MBR反应器承接来自A/O反应器的出水,主要是对混合液中直径大于膜孔径的微粒和微生物进行截留,从而提高出水水质。
表1. 实施例1滤液处理过程检测数据
Figure DEST_PATH_IMAGE002
对照例1
以传统高干脱水方式对来自无锡七里堤打捞点的藻泥进行脱水,脱水前添加石灰和铁盐为脱水药剂对藻泥进行调质,药剂添加量为石灰20%+氯化铁5%(均以占藻泥干重计),脱水方式为板框压滤脱水,滤液经收集后采用与实施例1相同(滤液进液量、停留时间、温度等参数均保持一致)的 “调节池+厌氧+A/O+MBR”工艺进行处理,水处理相关数据如表2(数据为各处理构筑物出水数据,单位mg/L),脱水泥饼热值为2912 cal/g,泥饼含水率58.30%。
表2. 对照1滤液处理过程检测数据
Figure DEST_PATH_IMAGE004
比较表1和表2相关数据可以发现:
(1)藻泥经热水解处理后,滤液COD大幅上升,于此同时,滤液pH、TN、NH3-N、Ca2+含量均出现不同程度下降;
(2)滤液pH的下降,可以减少对管道和设备产生的腐蚀;
(3)由于热水解过程中没有添加脱水药剂,导致藻泥热水解后溶解到滤液中的TN和NH3-N含量大幅度下降,减少了水处理过程中脱氮的负担,同时,相同的水处理工艺条件下,对照例1最终出水的TN和NH3-N含量并未达到纳管排放标准(GB/T 31962-2015)的A级要求,可通过减小水处理构筑物的负荷(减小进水量或将进水稀释以减小TN、NH3-N初始浓度),使得最终出水达到纳管排放标准(GB/T 31962-2015)的A级要求,但会增加整体的水处理工艺时间,致使现有水处理系统无法满足巅峰期的水处理量要求;或者通过增加污水在水处理构筑物中的停留时间来提高氮的去除率。两种方法都增加了水处理的时长;
(4)滤液中Ca2+含量的降低,不仅可以避免管道产生结垢,也减轻了MBR膜堵塞的风险;
(5)比较两种藻泥处置方式脱水泥饼数据可以看出,本发明方法的泥饼的干基热值更高。
实施例2
S1、物料混合,将来自无锡杨湾打捞点含水率为90%的蓝藻藻泥18t,与0.18t(占藻泥干重10%)、粒径≤5mm锯末混合;
S2、热水解,将蓝藻藻泥和锯末的混合物料在反应釜中进行热水解反应,反应温度220℃,反应时间1h,其中,反应釜未对压力进行设定;
S3、脱水,将热水解后的混合物料经板框压滤机进行固液分离,所得泥饼含水率46%,固渣干基热值3300 cal/g,所得滤液水经污水处理设施处理后达到纳管排放标准(GB/T31962-2015)的A级要求,进行排放。
实施例3
S1、物料混合,将来自无锡渔港打捞点的浓缩藻泥16t(含水率88%),与0.288t(占藻泥干重15%)、粒径≤5mm秸秆粉混合;
S2、热水解,将蓝藻藻泥和秸秆粉的混合物料在反应釜中进行热水解反应,反应温度180℃,反应时间3h,其中,反应釜未对压力进行设定;
S3、脱水,将热水解后的混合物料经板框压滤机进行固液分离,所得泥饼含水率47.5%,固渣干基热值3100 cal/g,所得滤液水经污水处理设施处理后达到纳管排放标准(GB/T31962-2015)的A级要求,进行排放。

Claims (4)

1.一种蓝藻藻泥资源化处理方法,其特征在于,所述方法包括依次进行的以下步骤:物料混合、热水解和脱水;
所述物料混合步骤包括将蓝藻藻泥和农林废弃物进行混合,所述蓝藻藻泥的含水率85%~95%,所述农林废弃物的添加量为蓝藻藻泥干物质重量的5%~30%;
所述热水解步骤不添加化学药剂并且反应温度不低于180℃。
2.根据权利要求1所述的一种蓝藻藻泥资源化处理方法,其特征在于:所述农林废弃物包括但不限于秸秆粉、稻壳粉、玉米芯粉、米糠、竹粉、锯末,所述农林废弃物的粒径≤5mm。
3.根据权利要求1所述的一种蓝藻藻泥资源化处理方法,其特征在于:所述热水解步骤的反应热源为蒸汽,反应温度为180℃~230℃,反应时间为0.5h~3h。
4.根据权利要求1所述的一种蓝藻藻泥资源化处理方法,其特征在于:所述脱水采用板框压滤机。
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CN113603333A (zh) * 2021-08-11 2021-11-05 江苏霖生生态环境科技有限公司 一种生物炭基材料介导蓝藻泥深度干化设备及工艺技术及工艺
CN114212943A (zh) * 2021-12-28 2022-03-22 上海轻叶能源股份有限公司 一种蓝藻无害化资源化处理新工艺
CN114262140A (zh) * 2021-12-22 2022-04-01 华润环保发展有限公司 一种蓝藻深度脱水方法

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