CN108408896A - 一种工业和城市混合污水稳定运行的控制方法 - Google Patents
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Abstract
本发明涉及提供一种工业和城市混合污水稳定运行的控制方法,具体地说是分别以目标污水处理厂的活性炭复合活性污泥和沸石复合硝化菌为指示微生物制备微生物电极,采用多通道生物传感器分别对污水厂进水水质和好氧消化池水质的毒性进行监测,为防控工业废水中的毒性物质对生物处理系统的冲击提供依据,从而保障工业和城市混合污水处理厂的稳定运行和节能降耗。该发明专利方法简单,廉价,便于操作,弥补了传统化学监测仪器分析不能客观反映微生物活性的不足,具有良好的推广应用前景。
Description
技术领域
本发明涉及一种工业和城市混合污水稳定运行的控制方法。
背景技术
随着工业的快速发展,电镀、冶金、化工等行业产生了大量的含有毒有机物、重金属离子或酸碱度失常的废水。由于该类废水水质复杂,毒性较强,可生化性不高,单独生物处理较为困难,因此,将工业排放废水与城市污水混合处理成为解决工业废水难处理问题的常见措施。但这对于以生物处理技术为核心的污水处理厂而言,工业废水对微生物的毒性冲击作用是制约处理出水水质改善的重要因素,废水中的有毒物质能够抑制生物处理单元中微生物的特定功能,或者对其产生整体麻醉效应,从而影响其正常代谢,导致水厂运行不稳定、出水水质降低,并进一步影响受纳水体的水环境质量。因此,对于排入城镇污水处理厂的工业废水,根据其水质特点及其变化情况,应采取多种的应对措施,有效减少其对城镇污水处理厂运行的影响。
近年来,污水处理厂控制技术已成为保证污水处理厂出水本质稳定运行、降低污水处理能耗物耗的重要技术支撑,其中,对水温、pH值、浊度、DO值、COD值和BOD值等参数的在线测控成为污水厂控制技术的重要组成部分。但是,由于上述监测指标与工业废水的毒性效应之间往往没有直接的相关性,因此,这些监测控制技术并不能很好地实现对工业废水的毒性冲击有效预测,从而难以对生物处理系统进行有效保护。
在水质毒性检测技术方面,实用新型专利CN 20179601U公布了一种水质毒性检测用多通道生物传感装置,其可通过选择固定不同的毒性敏感菌株或混合菌, 对污染物或污染源的毒性做出评价,具有毒性检 测污染物范围宽、操作简单、不受样品色度和浊度干扰、毒性检测结果更具客观真实性等优势,可很好适用于污水处理厂水质急性毒性分析的需要,但该生物传感器毒性分析的稳定性仍有待提高。
发明内容
针对现有技术的不足,本发明的目的在于提供一种工业和城市混合污水稳定运行的控制方法。
为实现上述目的,本发明采用以下技术方案:
一种工业和城市混合污水稳定运行的控制方法,具体步骤如下:
(1)活性炭复合活性污泥培养:从目标污水处理厂的生物曝气池中直接取好氧活性污泥混合液1.0~5.0 mL接种到30 mL牛肉膏蛋白胨培养基中,在37℃和200 r/min条件下振荡培养12~48h后,加入2~10g粉末活性炭,混合均匀,经过0.45um微孔滤膜过滤后放置到冰箱中4℃保存待用,记为复合菌体A;
(2)沸石复合硝化菌培养:从目标污水处理厂的生物曝气池中直接取好氧活性污泥混合液2.0~10.0 mL接种到装有30 mL硝化细菌富集培养基的无菌锥形瓶中,28℃恒温黑暗培养至NO3 --N的生成率到90%以上,加入1~5g天然沸石粉末,混合均匀,经过0.22um微孔滤膜过滤后放置到冰箱中4℃保存待用,记为复合菌体B;
(3)微生物传感器电极制备,取步骤(1)得到的复合菌体A1~20mg和步骤(2)得到的复合菌体B5~30mg,分别均匀涂布在多通道生物传感装置(CN 20179601U)碳电极工作区域,将聚碳酸酯膜分别覆盖在复合菌体A和复合菌体B上,通过双面胶粘贴把复合菌体A和复合菌体B密封固定在碳电极工作区域,分别制得微生物电极A和微生物电极B,将制备好的微生物电极装入多通道生物传感器装置,即可实现对污水水质毒性的检测;
(4)将装配有微生物电极A的多通道生物传感器置于污水厂进水口端,用于监测进水水质对活性污泥的综合毒性,以污水处理厂的二沉池出水为空白对照,当电流信号I 污水/I 参比≤85%时,发出水质毒性报警,毒性报警信号反馈给污水处理厂进行调控决策;
(5)将装配有微生物电极B的多通道生物传感器置于污水厂好氧硝化反应池端,以污水处理厂的二沉池出水为空白对照,电流信号I 污水/I 参比≤90%时,发出水质毒性报警,毒性报警信号反馈给污水处理厂进行调控决策。
本发明中,步骤(1)中所述的牛肉膏蛋白胨培养基为:牛肉膏2.0g,蛋白胨8.0 g,NaCl 5.0 g,水1000 mL,pH 7.0-7.5。
本发明中,步骤(1)中所述的粉末活性炭为市售活性炭,平均粒径10μm。
本发明中,步骤(2)中所述的硝化细菌富集培养基为:亚硝酸钠1g,碳酸钠1g,氯化钠0.5g,磷酸氢二钾0.5g,硫酸镁0.5g,硫酸亚铁0.4g,超纯水定容至1L,pH7.8,121℃高温灭菌30min。
本发明中,步骤(2)中所述的天然沸石粉末粒径不小于500目。
本发明的原理为:以目标工业和城市混合污水处理厂的活性炭复合活性污泥和沸石复合硝化菌为指示微生物制备微生物电极,采用多通道生物传感器分别对污水厂进水水质和好氧消化池水质的毒性进行监测,为防控工业废水中的毒性物质对生物处理系统的冲击提供依据,从而保障工业和城市混合污水处理厂的稳定运行和节能降耗。
与现有技术相比,本发明的有益效果在于:
1.以目标污水处理厂的活性污泥为指示微生物制备微生物电极,能快速对进水水质的毒性作出客观真实的反应,为污水厂进水水质的毒性冲击的应急调控提供依据,从而实现对污水生物处理系统的有效保护。
2.以目标污水厂的硝化菌指示微生物制备微生物电极,克服了常规的DO监测不能有效反映自养硝化菌活性变化的缺陷,为污水厂的生物脱氮和节能降耗提供更直接的依据。
3.在指示微生物的制备中,分别创新性地添加粉末活性炭和天然沸石,利用它们对培养基的吸附,为各自微生物提供较高浓度的营养底物,大大降低了污水中营养物浓度变化给生物传感器毒性分析带来的干扰,极大地提升了毒性分析的稳定性。
4.该发明专利方法简单,廉价,便于操作,弥补了传统化学监测不能客观反映微生物活性的不足,具有良好的推广应用前景。
具体实施方式
以下实施例将对本发明作进一步说明。
实施例1
(1)活性炭复合活性污泥培养:从上海某污水处理厂的生物曝气池中直接取好氧活性污泥混合液2.0 mL接种到30 mL牛肉膏蛋白胨培养液中,在37℃和200 r/min振荡培养24h后,加入5.0g椰壳粉末活性炭,混合均匀,经过0.45um微孔滤膜过滤后放置到冰箱中4℃保存待用,记为A。
(2)沸石复合硝化菌培养:从上海某污水处理厂的生物曝气池中直接取好氧活性污泥混合液5.0 mL接种至装有30 mL硝化细菌富集培养基的无菌锥形瓶中,28℃恒温黑暗培养至NO3 --N的生成率到92%,加入3.0g天然沸石粉末,混合均匀,经过0.22um微孔滤膜过滤后放置到冰箱中4℃保存待用,记为B。
(3)微生物传感器电极制备,分别取上述制备的复合菌体A 2.5mg和B 5.0 mg,均匀涂布在多通道生物传感装置(CN 20179601U)碳电极工作区域,将聚碳酸酯膜覆盖在菌体上,通过双面胶粘贴把菌体密封固定在碳电极工作区域,分别制得微生物电极A和微生物电极B。
实施例2
本实施例中,采用厌氧/缺氧/好氧(A2/O)活性污泥脱氮系统处理上海某污水厂污水,A2/O反应器有效容积为2.5m3,厌氧:缺氧:好氧=1:1:1,厌氧区和缺氧区设有搅拌,好氧区DO控制在2.5mg/L,污泥回流比50%,消化液回流比为100%,泥龄控制在12d,以某城市污水为处理对象(进水水质见表1)。在反应器进水端,设置装有微生物电极A的多通道生物传感器,用于检测进水水质对活性污泥的毒性;在好氧反应池端,设置装有微生物电极B的多通道生物传感器,用于检测硝化池污水对硝化菌的毒性。
实验过程中,在进水中投加不同浓度Cu2+,分别采用上述多通道生物传感器进行水质毒性的跟踪分析,记录电流信号I 污水/I 参比(见表1)。结果表明,该传感器对水质毒性的分析结果与该污水处理工艺的处理性能变化有良好的关联性,其毒性分析数据可为污水处理工艺的调控提供有效依据。
表1 A2/O工艺处理污水性能
实施例3
本实施例中,采用厌氧/缺氧/好氧(A2/O)活性污泥脱氮系统处理上海某污水厂污水,A2/O反应器有效容积为2.5m3,厌氧:缺氧:好氧=1:0.5:1.5,厌氧区和缺氧区设有搅拌,好氧区DO控制在2.5mg/L,污泥回流比50%,消化液回流比为100%,泥龄控制在15d,以某城市污水为处理对象(进水水质见表2)。在反应器进水端,设置装有微生物电极A的多通道生物传感器,用于检测进水水质对活性污泥的毒性;在好氧反应池端,设置装有微生物电极B的多通道生物传感器,用于检测硝化池污水对硝化菌的毒性。
实验过程中,在进水中投加不同浓度对氯苯酚(4-CP),分别采用上述多通道生物传感器进行水质毒性的跟踪分析,记录电流信号I 污水/I 参比(见表2)。结果表明,该传感器对水质毒性的分析结果与该污水处理工艺的处理性能变化有良好的关联性,其毒性分析数据可为污水处理工艺的调控提供有效依据。
表2 A2/O工艺处理城市污水性能
Claims (5)
1.一种工业和城市混合污水稳定运行的控制方法,其特征在于具体步骤如下:
(1)活性炭复合活性污泥培养:从目标污水处理厂的生物曝气池中直接取好氧活性污泥混合液1.0~5.0 mL接种到30 mL牛肉膏蛋白胨培养基中,在37℃和200 r/min条件下振荡培养12~48h后,加入2~10g粉末活性炭,混合均匀,经过0.45um微孔滤膜过滤后放置到冰箱中4℃保存待用,记为复合菌体A;
(2)沸石复合硝化菌培养:从目标污水处理厂的生物曝气池中直接取好氧活性污泥混合液2.0~10.0 mL接种到装有30 mL硝化细菌富集培养基的无菌锥形瓶中,28℃恒温黑暗培养至NO3 --N的生成率到90%以上,加入1~5g天然沸石粉末,混合均匀,经过0.22um微孔滤膜过滤后放置到冰箱中4℃保存待用,记为复合菌体B;
(3)微生物传感器电极制备,取步骤(1)得到的复合菌体A1~20mg和步骤(2)得到的复合菌体B5~30mg,分别均匀涂布在多通道生物传感装置碳电极工作区域,将聚碳酸酯膜分别覆盖在复合菌体A和复合菌体B上,通过双面胶粘贴把复合菌体A和复合菌体B密封固定在碳电极工作区域,分别制得微生物电极A和微生物电极B,将制备好的微生物电极装入多通道生物传感器装置,即可实现对污水水质毒性的检测;
(4)将装配有微生物电极A的多通道生物传感器置于污水厂进水口端,用于监测进水水质对活性污泥的综合毒性,以污水处理厂的二沉池出水为空白对照,当电流信号I 污水/I 参比≤85%时,发出水质毒性报警,毒性报警信号反馈给污水处理厂进行预控决策;
(5)将装配有微生物电极B的多通道生物传感器置于污水厂好氧硝化反应池端,以污水处理厂的二沉池出水为空白对照,以检测污水的电流信号强度低于该参比的电流信号强度的10%为毒性预警线,毒性报警信号反馈给污水处理厂进行调控决策。
2.根据权利要求1所述的一种工业和城市混合污水稳定运行的控制方法,其特征在于步骤(1)中所述的牛肉膏蛋白胨培养基为:牛肉膏2.0g,蛋白胨8.0 g,NaCl5.0 g,水1000mL,pH 7.0-7.5。
3.根据权利要求1所述的一种工业和城市混合污水稳定运行的控制方法,其特征在于步骤(1)中所述的粉末活性炭为市售活性炭,平均粒径10μm。
4.根据权利要求1所述的一种工业和城市混合污水稳定运行的控制方法,其特征在于步骤(2)中所述的硝化细菌富集培养基为:亚硝酸钠1g,碳酸钠1g,氯化钠0.5g,磷酸氢二钾0.5g,硫酸镁0.5g,硫酸亚铁0.4g,超纯水定容至1L,pH7.8,121℃高温灭菌30min。
5.根据权利要求1所述的一种工业和城市混合污水稳定运行的控制方法,其特征在于步骤(2)中所述的天然沸石粉末粒径不小于500目。
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