CN111517528A - Device and method for treating ammonia nitrogen in desulfurization wastewater by membrane absorption method - Google Patents
Device and method for treating ammonia nitrogen in desulfurization wastewater by membrane absorption method Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/16—Nitrogen compounds, e.g. ammonia
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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- C02F2103/18—Nature of the water, waste water, sewage or sludge to be treated from the purification of gaseous effluents
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Abstract
Description
技术领域technical field
本发明涉及脱硫废水处理技术领域,具体而言,涉及一种膜吸收法处理脱硫废水中氨氮的装置及方法。The invention relates to the technical field of desulfurization wastewater treatment, in particular to a device and method for treating ammonia nitrogen in desulfurization wastewater by membrane absorption method.
背景技术Background technique
随着我国环保要求的不断提高,石灰石-石膏湿法脱硫技术由于具有脱硫效率高,运行稳定等优点,广泛应用于燃煤电厂、钢厂等领域的烟气脱硫中。在石灰石-石膏湿法脱硫过程中,为了保证石膏品质和脱硫效率等,需要排放一定量的脱硫浆液,最终产生脱硫废水。脱硫废水成分复杂,含有高浓度悬浮物、氨氮、硫酸盐、钙镁离子、氯离子以及多种重金属。脱硝工艺大规模应用,喷氨过量情况普遍存在,造成废水中氨氮大幅提高,可达5000mg/L。目前脱硫废水主要采用三联箱工艺处理,主要针对废水中的悬浮物和重金属进行去除,对氨氮无明显去除效果,因此造成氨氮超标严重。With the continuous improvement of my country's environmental protection requirements, limestone-gypsum wet desulfurization technology is widely used in flue gas desulfurization in coal-fired power plants, steel mills and other fields due to its high desulfurization efficiency and stable operation. In the limestone-gypsum wet desulfurization process, in order to ensure gypsum quality and desulfurization efficiency, a certain amount of desulfurization slurry needs to be discharged, and finally desulfurization wastewater is generated. The composition of desulfurization wastewater is complex and contains high concentrations of suspended solids, ammonia nitrogen, sulfate, calcium and magnesium ions, chloride ions and various heavy metals. Large-scale application of denitrification process, excessive ammonia injection is common, resulting in a significant increase in ammonia nitrogen in wastewater, up to 5000mg/L. At present, the desulfurization wastewater is mainly treated by the triple box process, mainly for the removal of suspended solids and heavy metals in the wastewater, and has no obvious removal effect on ammonia nitrogen, so the ammonia nitrogen exceeds the standard seriously.
高氨废水在实际生产中来源广泛,如焦化、石油化工、药品生产、养殖、化肥和肉类加工等行业,以及垃圾渗透液和动物排泄物等。对于含有高浓度氨氮废水的处理,直接采用生物法处理很难得到较好的去除效果。另外,氨作为一种重要的化工原料,高氨废水中的氨氮通过生物处理使之转化为氮气排入大气,也是对资源的浪费,不符合循环经济理念。因此,实际高氨废水大多先经过物化法进行预处理后,再根据实际情况进行后续生物处理。目前常用的高浓度氨氮废水的处理方法主要包括化学沉淀法和吹脱法。High ammonia wastewater has a wide range of sources in actual production, such as coking, petrochemical, pharmaceutical production, aquaculture, fertilizer and meat processing industries, as well as garbage permeate and animal waste. For the treatment of wastewater containing high concentrations of ammonia nitrogen, it is difficult to obtain a better removal effect directly by biological treatment. In addition, as an important chemical raw material, ammonia nitrogen in high-ammonia wastewater is converted into nitrogen gas and discharged into the atmosphere through biological treatment, which is also a waste of resources and does not conform to the concept of circular economy. Therefore, most of the actual high ammonia wastewater is pretreated by physicochemical method first, and then the subsequent biological treatment is carried out according to the actual situation. At present, the commonly used treatment methods of high-concentration ammonia nitrogen wastewater mainly include chemical precipitation method and stripping method.
化学沉淀法去主要指磷酸铵镁(Magnesium Ammonium Phosphate,简称MAP)法,该方法利用磷酸铵镁不溶于水的性质,向含废水中加入含PO4 3+和Mg2+离子的化学药剂,废水中的NH4 +与PO4 3+和Mg2+离子反应生成磷酸铵镁沉淀,最终将废水中氨去除。化学沉淀法存在较多缺点,主要包括沉淀污泥产生量大,二次污染严重;沉淀药剂投加量大,药剂成本高。The chemical precipitation method mainly refers to the Magnesium Ammonium Phosphate (Magnesium Ammonium Phosphate, referred to as MAP) method. This method utilizes the insoluble nature of magnesium ammonium phosphate in water to add chemicals containing PO 4 3+ and Mg 2+ ions to the wastewater. The NH 4 + in the wastewater reacts with PO 4 3+ and Mg 2+ ions to form magnesium ammonium phosphate precipitation, and finally the ammonia in the wastewater is removed. The chemical precipitation method has many disadvantages, mainly including a large amount of sediment sludge and serious secondary pollution; a large amount of precipitation chemicals is added, and the cost of the chemicals is high.
吹脱法的是废水在碱性条件下(一般将pH调至11.0左右),然后向废水中通入空气或是蒸汽,在空气的搅拌和夹带作用下,游离的分子态氨从废水中溢出,然后对溢出的混合气体进行酸液吸收,从而去除废水中的氨并以铵盐的形式将氨进行回收。在处理废水中高浓度的氨氮时,吹脱法具有效率高、对水质变动适应性强以及可以回收废水中氨的优点。但是吹脱法也存在很多不足之处,如在常温下采用加压空气吹脱时,不仅氨氮的去除效果较差,而且空气需求量大;当采用蒸汽吹脱时,能耗较高,同时由于蒸汽的冷凝作用,还会造成废水体积的显著增加;此外,吹脱法还存在设备容易结垢、装置的运行和维护不便的问题。The stripping method is that the wastewater is under alkaline conditions (usually the pH is adjusted to about 11.0), and then air or steam is introduced into the wastewater. Under the agitation and entrainment of the air, free molecular ammonia overflows from the wastewater. The overflowing mixed gas is then absorbed by acid liquid, thereby removing ammonia in the wastewater and recovering the ammonia in the form of ammonium salts. When dealing with high concentrations of ammonia nitrogen in wastewater, the stripping method has the advantages of high efficiency, strong adaptability to changes in water quality, and the ability to recover ammonia in wastewater. However, the stripping method also has many shortcomings. For example, when the pressurized air stripping is used at room temperature, not only the removal effect of ammonia nitrogen is poor, but also the air demand is large; when the steam stripping is used, the energy consumption is high. The condensation effect of steam will also cause a significant increase in the volume of wastewater; in addition, the stripping method also has the problems of easy scaling of the equipment and inconvenient operation and maintenance of the device.
为了避免确保脱硫废水中氨氮达标排放和回收氨氮资源,鉴于现存脱硫废水浓缩工艺的缺点和不足,开发新型脱硫废水处理方法已经成为急需解决的问题。In order to avoid ensuring the discharge of ammonia nitrogen in desulfurization wastewater up to the standard and to recover ammonia nitrogen resources, in view of the shortcomings and deficiencies of the existing desulfurization wastewater concentration process, the development of new desulfurization wastewater treatment methods has become an urgent problem to be solved.
发明内容SUMMARY OF THE INVENTION
为解决上述问题,本发明的目的在于提供一种膜吸收法处理脱硫废水中氨氮的装置及方法。In order to solve the above problems, the purpose of the present invention is to provide a device and method for treating ammonia nitrogen in desulfurization wastewater by membrane absorption method.
本发明提供了一种膜吸收法处理脱硫废水中氨氮的装置,该装置包括:The invention provides a device for treating ammonia nitrogen in desulfurization wastewater by membrane absorption method. The device comprises:
调碱池,其顶端设有碱性药剂投加装置;Alkali adjusting tank, the top of which is provided with alkaline agent dosing device;
除重池,其顶端设有有机硫投加装置,所述除重池的入口端与所述调碱池的出口端连接,所述除重池的出口端与澄清池的入口端连接;The deweighting tank is provided with an organic sulfur dosing device at the top, the inlet end of the deweighting tank is connected with the outlet end of the alkali conditioning tank, and the outlet end of the deweighting tank is connected with the inlet end of the clarifier;
中间水池,其入口端与所述澄清池的出口端连接,所述中间水池的出口端与膜吸收组件的第一入口端连接,所述膜吸收组件内部设有分离膜;an intermediate water tank, the inlet end of which is connected with the outlet end of the clarification tank, the outlet end of the intermediate water tank is connected with the first inlet end of the membrane absorption assembly, and the membrane absorption assembly is provided with a separation membrane;
吸收液池,其入口端与所述膜吸收组件的第一出口端连接,所述吸收液池的出口端与所述膜吸收组件的第二入口端连接,所述膜吸收组件的第一入口端和第二入口端分设于所述分离膜的两侧。。an absorption liquid pool, the inlet end of which is connected with the first outlet end of the membrane absorption assembly, the outlet end of the absorption liquid pool is connected with the second inlet end of the membrane absorption assembly, and the first inlet of the membrane absorption assembly The end and the second inlet end are located on both sides of the separation membrane. .
作为本发明进一步的改进,所述调碱池内设有第一搅拌装置,所述除重池内设有第二搅拌装置,所述吸收液池内设有第三搅拌装置。As a further improvement of the present invention, the alkali adjusting tank is provided with a first stirring device, the weight removal tank is provided with a second stirring device, and the absorption liquid tank is provided with a third stirring device.
作为本发明进一步的改进,所述澄清池的底端与污泥脱水机的入口端连接,所述污泥脱水机的出口端与所述调碱池的入口端连接。As a further improvement of the present invention, the bottom end of the clarifier is connected to the inlet end of the sludge dehydrator, and the outlet end of the sludge dehydrator is connected to the inlet end of the alkali conditioning tank.
作为本发明进一步的改进,所述中间水池的出口端与所述膜吸收组件的第一入口端之间设有第一水泵;所述吸收液池的出口端与所述膜吸收组件的第二入口端之间设有第二水泵。As a further improvement of the present invention, a first water pump is provided between the outlet end of the intermediate water tank and the first inlet end of the membrane absorption assembly; the outlet end of the absorption liquid pool is connected to the second inlet end of the membrane absorption assembly A second water pump is provided between the inlet ends.
作为本发明进一步的改进,所述膜吸收组件的第二出口端设有废液输出管道,所述废液输出管道上设有酸投加装置。As a further improvement of the present invention, the second outlet end of the membrane absorption assembly is provided with a waste liquid output pipeline, and an acid dosing device is provided on the waste liquid output pipeline.
作为本发明进一步的改进,所述澄清池的出口端与所述中间水池的入口端之间设有多介质过滤器。As a further improvement of the present invention, a multi-media filter is provided between the outlet end of the clarifier and the inlet end of the intermediate water tank.
作为本发明进一步的改进,所述分离膜为疏水膜,且所述分离膜为平板式、中空纤维式、卷式中的一种或几种。As a further improvement of the present invention, the separation membrane is a hydrophobic membrane, and the separation membrane is one or more of a flat plate type, a hollow fiber type, and a roll type.
本发明还提供了一种膜吸收法处理脱硫废水中氨氮的方法,该方法包括以下步骤:The invention also provides a method for treating ammonia nitrogen in desulfurization wastewater by membrane absorption method, which comprises the following steps:
步骤1、脱硫废水进入调碱池中,通过碱性药剂投加装置向调碱池中投加碱性药剂调节脱硫废水的PH值为11-13;Step 1. The desulfurization wastewater enters the alkali adjustment tank, and the alkaline agent is added into the alkali adjustment tank through the alkaline agent dosing device to adjust the pH value of the desulfurization wastewater to 11-13;
步骤2、脱硫废水进入除重池中,通过有机硫投加装置向除重池中投加有机硫并用第二搅拌装置予以搅拌,用于去除脱硫废水中的重金属;Step 2, the desulfurization wastewater enters the deweighting tank, and the organic sulfur is added into the weight removal tank through the organic sulfur dosing device and stirred with the second stirring device, so as to remove the heavy metals in the desulfurization wastewater;
步骤3、除去重金属的脱硫废水进入澄清池中,通过絮凝和澄清作用去除脱硫废水中的悬浮物;Step 3. The desulfurization wastewater from which heavy metals are removed enters the clarifier, and the suspended solids in the desulfurization wastewater are removed by flocculation and clarification;
步骤4、澄清池中的上清液过滤后进入中间水池中;
步骤5、中间水池中的上清液进入膜吸收组件中分离膜的一侧,通过分离膜将脱硫废水中的氨气予以分离并进入分离膜的另一侧被酸性吸收液吸收,从而去除脱硫废水中的氨氮。
作为本发明进一步的改进,所述步骤3澄清作用后的沉淀进入污泥脱水机中予以脱水处理,并将脱水后的滤液水重新输送至调碱池1中予以处理。As a further improvement of the present invention, the precipitation after the clarification in step 3 enters the sludge dewatering machine for dehydration treatment, and the dehydrated filtrate water is re-transported to the alkali adjustment tank 1 for treatment.
作为本发明进一步的改进,还包括步骤6、当脱硫废水中的氨氮含量达标后,通过酸投加装置向其加酸调节脱硫废水的PH为6-8后予以排出。As a further improvement of the present invention, it also includes step 6: when the ammonia nitrogen content in the desulfurization wastewater reaches the standard, add acid to the desulfurization wastewater to adjust the pH of the desulfurization wastewater to 6-8 and then discharge it through an acid dosing device.
本发明的有益效果为:本申请具有流程简单、污泥产生量少、氨氮去除效率高、可回收氨氮高和运行成本低等优点。The beneficial effects of the present invention are as follows: the present application has the advantages of simple process, low sludge production, high ammonia nitrogen removal efficiency, high recoverable ammonia nitrogen, and low operating cost.
附图说明Description of drawings
为了更清楚地说明本发明实施例或现有技术中的技术方案,下面将对实施例或现有技术描述中所需要使用的附图作简单地介绍。显而易见地,下面描述中的附图仅仅是本发明的一些实施例,对于本领域普通技术人员来讲,在不付出创造性劳动性的前提下,还可以根据这些附图获得其他的附图。In order to illustrate the embodiments of the present invention or the technical solutions in the prior art more clearly, the following briefly introduces the accompanying drawings that are required in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention, and for those of ordinary skill in the art, other drawings can also be obtained from these drawings without creative effort.
图1为本发明实施例所述的一种膜吸收法处理脱硫废水中氨氮的装置结构示意图。FIG. 1 is a schematic structural diagram of a device for treating ammonia nitrogen in desulfurization wastewater by a membrane absorption method according to an embodiment of the present invention.
图中,In the figure,
1、调碱池;2、第一搅拌装置;3、除重池;4、第二搅拌装置;5、澄清池;6、污泥脱水机;7、中间水池;8、第一水泵;9、膜吸收组件;10、分离膜;11、吸收液池;12、第二水泵;13、第三搅拌装置;14、碱性药剂投加装置;15、有机硫投加装置;16、酸投加装置。1. Alkali adjusting tank; 2. The first stirring device; 3. Deweighting tank; 4. The second stirring device; 5. Clarifier; 6. Sludge dehydrator; 10. Separation membrane; 11. Absorption tank; 12. Second water pump; 13. Third stirring device; 14. Alkaline chemical dosing device; 15. Organic sulfur dosing device; 16. Acid dosing add device.
具体实施方式Detailed ways
下面将结合本发明实施例中的附图,对本发明实施例中的技术方案进行清楚、完整地描述,显然,所描述的实施例仅仅是本发明一部分实施例,而不是全部的实施例。基于本发明中的实施例,本领域普通技术人员在没有作出创造性劳动前提下所获得的所有其他实施例,都属于本发明保护的范围。The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.
需要说明,若本发明实施例中有涉及方向性指示(诸如上、下、左、右、前、后……),则该方向性指示仅用于解释在某一特定姿态(如附图所示)下各部件之间的相对位置关系、运动情况等,如果该特定姿态发生改变时,则该方向性指示也相应地随之改变。It should be noted that if there are directional indications (such as up, down, left, right, front, back, etc.) involved in the embodiments of the present invention, the directional indications are only used to explain a certain posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication also changes accordingly.
另外,在本发明的描述中,所用术语仅用于说明目的,并非旨在限制本发明的范围。术语“包括”和/或“包含”用于指定所述元件、步骤、操作和/或组件的存在,但并不排除存在或添加一个或多个其他元件、步骤、操作和/或组件的情况。术语“第一”、“第二”等可能用于描述各种元件,不代表顺序,且不对这些元件起限定作用。此外,在本发明的描述中,除非另有说明,“多个”的含义是两个及两个以上。这些术语仅用于区分一个元素和另一个元素。结合以下附图,这些和/或其他方面变得显而易见,并且,本领域普通技术人员更容易理解关于本发明所述实施例的说明。附图仅出于说明的目的用来描绘本发明所述实施例。本领域技术人员将很容易地从以下说明中认识到,在不背离本发明所述原理的情况下,可以采用本发明所示结构和方法的替代实施例。Also, in the description of the present invention, the terminology used is for the purpose of illustration only, and is not intended to limit the scope of the present invention. The terms "comprising" and/or "comprising" are used to designate the presence of stated elements, steps, operations and/or components, but do not preclude the presence or addition of one or more other elements, steps, operations and/or components . The terms "first," "second," and the like, may be used to describe various elements, do not represent an order, and do not limit the elements. In addition, in the description of the present invention, unless otherwise specified, "plurality" means two or more. These terms are only used to distinguish one element from another. These and/or other aspects will become apparent, and the description of the described embodiments of the present invention, will be more readily understood by those of ordinary skill in the art in conjunction with the following drawings. The drawings are used to depict the described embodiments of the invention for purposes of illustration only. Those skilled in the art will readily recognize from the following description that alternative embodiments of the structures and methods of the present invention may be employed without departing from the principles described herein.
实施例1,如图1所示,本发明实施例所述的一种膜吸收法处理脱硫废水中氨氮的装置,该装置包括:Embodiment 1, as shown in FIG. 1, a device for treating ammonia nitrogen in desulfurization wastewater by membrane absorption method according to the embodiment of the present invention, the device includes:
调碱池1,其顶端设有碱性药剂投加装置14。调碱池1为封闭式反应器,碱性药剂投加装置14向调碱池1内的脱硫废水投加碱性药剂使脱硫废水的PH值处于11-13,以确保脱硫废水中足够的OH-以保证脱硫废水中的NH4 +能够充分地转化为NH3。投加的碱性药剂可以为氢氧化钙或氢氧化钠等,而不仅限于上述所述两种。The alkali adjusting tank 1 is provided with an alkaline
除重池3,其顶端设有有机硫投加装置15,除重池3的入口端与调碱池1的出口端连接,除重池3的出口端与澄清池5的入口端连接。除重池3为封闭式反应器,有机硫投加装置15向除重池3中的脱硫废水投加有机硫,使有机硫与脱硫废水中的重金属反应,用于除去铅、汞等重金属。澄清池5为封闭式反应器,去除重金属后的脱硫废水通过溢流或管道输送至澄清池5中,澄清池5内设有絮凝剂和助凝剂投加装置,向去除重金属后的脱硫废水投加絮凝剂和助凝剂,使废水中的悬浮物得以沉淀并予以去除,悬浮物在絮凝过程中也会同时发挥夹带作用去除脱硫废水中的部分COD。The top of the deweighting tank 3 is provided with an organic
中间水池7,其入口端与澄清池5的出口端连接,中间水池7的出口端与膜吸收组件9的第一入口端连接,膜吸收组件9内部设有分离膜10。中间水池7为封闭式反应器,澄清池5内的上清液通过中间水池7进入膜吸收组件9中。分离膜10选用疏水膜可以使上清液中的氨气被分离出来,并被分离膜10另一侧的吸收液吸收去除,实现脱硫废水中去除氨氮的目的。The inlet end of the intermediate water tank 7 is connected to the outlet end of the
吸收液池11,其入口端与膜吸收组件9的第一出口端连接,吸收液池11的出口端与膜吸收组件9的第二入口端连接,膜吸收组件9的第一入口端和第二入口端分设于分离膜10的两侧。吸收液池11为酸性吸收液,其酸性吸收剂的质量浓度小于2%。酸性吸收液通过膜吸收组件9的第二入口端进入膜吸收组件9中,当酸性吸收液对氨气完成吸收后,通过膜吸收组件9的第一出口端回流至吸收液池11中。当吸收液池11中酸性吸收液PH为6-8时,将吸收液外排利用,并补充新的吸收液重复上述膜吸收过程。The inlet end of the
进一步的,调碱池1内设有第一搅拌装置2,除重池3内设有第二搅拌装置4,吸收液池11内设有第三搅拌装置13。第一搅拌装置2、第二搅拌装置4和三搅拌装置13分别对调碱池1、除重池3和洗手液池11中的溶液发挥搅拌作用,使其内部的溶液混合均匀进而充分反应。Further, the alkali adjusting tank 1 is provided with a first stirring device 2 , the weight removing tank 3 is provided with a
进一步的,澄清池5的底端与污泥脱水机6的入口端连接,污泥脱水机6的出口端与调碱池1的入口端连接。澄清池5内悬浮物生成的沉淀进入污泥脱水机6,沉淀经脱水处理后排出进行后续处理,脱水后产生的滤液水回流到调碱池1重复上述处理过程。Further, the bottom end of the
进一步的,中间水池7的出口端与膜吸收组件9的第一入口端之间设有第一水泵8;吸收液池11的出口端与膜吸收组件9的第二入口端之间设有第二水泵12。第一水泵8将中间水池7中的脱硫废水输送至膜吸收组件9中,第二水泵12将吸收液池11中的酸性吸收液输送至膜吸收组件9中。Further, a first water pump 8 is provided between the outlet end of the intermediate water tank 7 and the first inlet end of the membrane absorption assembly 9; Two water pumps 12 . The first water pump 8 transports the desulfurized wastewater in the intermediate water tank 7 to the membrane absorption assembly 9 , and the
进一步的,膜吸收组件9的第二出口端设有废液输出管道,废液输出管道上设有酸投加装置16。当脱硫废水中的氨氮浓度达标之后需要将其予以排出,而在排出前需要通过加酸装置16向脱氨废水中投加酸性药剂使其PH值处于6-8之间予以排出。在应用过程中可在废液输出管道上设置PH检测装置,用于对脱氨废水的PH进行实时检测。Further, the second outlet end of the membrane absorption assembly 9 is provided with a waste liquid output pipeline, and an
进一步的,澄清池5的出口端与中间水池7的入口端之间设有多介质过滤器。多介质过滤器对澄清池5中的上清液进行过滤处理,之后再将过滤后的上清液输送至中间水池7中,确保进入中间水池7中的脱硫废水中的悬浮物浓度小于5mg/L,进而避免分离膜10被污染或分离膜10的膜孔被堵塞。Further, a multi-media filter is provided between the outlet end of the
进一步的,分离膜10为疏水膜,且分离膜10为平板式、中空纤维式、卷式中的一种或几种。分离膜10选用疏水膜可以使脱硫废水中的氨气被分离出来,并被分离膜10另一侧的亚硫酸吸收液吸收去除。而脱硫废水中的液态水和其他非挥发性的物质则被截留在脱硫废水中,脱氨后的脱硫废水则回流至中间水池7中。在应用中分离膜10可以选用平板式、中空纤维式、卷式,但不仅限于上述几种结构的疏水膜,具体选择哪种结构可根据实际情况予以选择。Further, the separation membrane 10 is a hydrophobic membrane, and the separation membrane 10 is one or more of a flat plate type, a hollow fiber type, and a roll type. A hydrophobic membrane is selected for the separation membrane 10, so that the ammonia gas in the desulfurization wastewater can be separated, and absorbed and removed by the sulfurous acid absorption liquid on the other side of the separation membrane 10. The liquid water and other non-volatile substances in the desulfurization wastewater are trapped in the desulfurization wastewater, and the desulfurization wastewater after deamination is returned to the intermediate pool 7 . In application, the separation membrane 10 can be a flat type, a hollow fiber type, or a roll type, but it is not limited to the hydrophobic membranes of the above-mentioned structures, and the specific structure can be selected according to the actual situation.
实施例2,本发明还提供了一种膜吸收法处理脱硫废水中氨氮的方法,该方法包括以下步骤:Embodiment 2, the present invention also provides a method for treating ammonia nitrogen in desulfurization wastewater by membrane absorption method, and the method comprises the following steps:
步骤1、脱硫废水进入调碱池1中,通过碱性药剂投加装置14向调碱池1中投加碱性药剂调节脱硫废水的PH值为11-13。确保有足够的氢氧根促进废水中的铵根离子转化为分子态的氨气,同时将脱硫废水PH调整至碱性,可以去除脱硫废水中部分重金属。Step 1. The desulfurization wastewater enters the alkali adjustment tank 1, and the alkaline agent is added into the alkali adjustment tank 1 through the alkaline
步骤2、脱硫废水进入除重池3中,通过有机硫投加装置15向除重池3中投加有机硫并用第二搅拌装置4予以搅拌,用于去除脱硫废水中的重金属。有机硫药剂与脱硫废水中的重金属发生反应,从而去除铅、汞等重金属离子。In step 2, the desulfurization wastewater enters the deweighting tank 3, and the organic sulfur is added into the weight removal tank 3 through the organic
步骤3、除去重金属的脱硫废水进入澄清池5中,通过絮凝和澄清作用去除脱硫废水中的悬浮物。通过絮凝澄清作用,去除脱硫废水中的悬浮物,同时通过悬浮物的夹带作用可以去除脱硫废水中的部分COD。Step 3. The desulfurization wastewater from which heavy metals have been removed enters the
步骤4、澄清池5中的上清液过滤后进入中间水池7中,确保中间水池7中脱硫废水悬浮物浓度小于5mg/L。
步骤5、中间水池7中的上清液进入膜吸收组件9中分离膜10的一侧,通过分离膜10将脱硫废水中的氨气予以分离并进入分离膜10的另一侧被酸性吸收液吸收,从而去除脱硫废水中的氨氮。吸收液池11中的酸性吸收液进入膜吸收组件9,吸收氨气后流出膜吸收组件9并回流到吸收液池11中。随着脱氨的进行,当吸收液池11中酸性吸收液pH为6-8时,将吸收液外排利用,并补充新的吸收液重复上述膜吸收过程。
进一步的,步骤3澄清作用后的沉淀进入污泥脱水机6中予以脱水处理,并将脱水后的滤液水重新输送至调碱池1中予以处理。Further, the precipitation after the clarification in step 3 enters the
进一步的,还包括步骤6、当脱硫废水中的氨氮含量达标后,通过酸投加装置16向其加酸调节脱硫废水的PH为6-8后予以排出。Further, it also includes step 6: when the ammonia nitrogen content in the desulfurization wastewater reaches the standard, add acid to the desulfurization wastewater to adjust the pH of the desulfurization wastewater to 6-8 through the
本申请中以某电厂脱硫废水原水(废水旋流器溢流),所用碱性剂为石灰乳,酸性吸收液为硫酸溶液为例,所用脱硫废水的主要水质参数如下表:In this application, taking the raw water of desulfurization wastewater from a power plant (wastewater cyclone overflow), the alkaline agent used is lime milk, and the acid absorption liquid is sulfuric acid solution as an example, the main water quality parameters of the desulfurization wastewater used are as follows:
脱硫废水首先进入调碱池1,通过碱性药剂投加装置14向调碱池1内投加质量分数为3%的石灰乳,将废水PH调整至12,反应30分钟后,调碱池1中废水通过溢流进入除重池3,向除重池3内加入有机硫,以去除废水中汞、铅的等重金属。The desulfurization wastewater first enters the alkali adjustment tank 1, and the lime milk with a mass fraction of 3% is added into the alkali adjustment tank 1 through the alkaline
搅拌反应30分钟后,除重池3中废水通过溢流进入澄清池5,在澄清池5中投加聚合氯化铁和PAM(浓度分别为30mg/L、6mg/L),通过絮凝澄清作用,去除废水中悬浮物。澄清池5中产生的沉淀进入污泥脱水机6,污泥脱水机6产生的滤液水回流到调碱池1中重复上述处理过程。After the stirring reaction for 30 minutes, the waste water in the deweighting tank 3 enters the
澄清池5上清液中的悬浮物浓度约为35mg/L。为了避免造成分离膜10污染,澄清池5的上清液经多介质过滤器过滤后,将废水中悬浮物浓度降低至约2mg/L,然后进入中间水池7,中间水池7中的废水进入膜吸收组件,在膜吸收组件9内废水中的氨以氨气形式挥发透过分离膜10,并被膜另一侧的2%的硫酸吸收液吸收,从而实现氨氮去除的目的。吸收液池11中的硫酸吸收液进入膜吸收组件9,吸收氨气后流出膜吸收组件9,并回流到吸收液池11中。The concentration of suspended solids in the supernatant of
当吸收液池11中硫酸吸收液PH为7时,将吸收液排出利用,并补充新的吸收液重复上述膜吸收过程。实验表明,经过膜吸收处理后,废水中的氨氮浓度降低至9mg/L,去除率超过99.8%,低于国家一级排放标准。When the pH of the sulfuric acid absorption liquid in the
在此处所提供的说明书中,说明了大量具体细节。然而,能够理解,本发明的实施例可以在没有这些具体细节的情况下实践。在一些实例中,并未详细示出公知的方法、结构和技术,以便不模糊对本说明书的理解。In the description provided herein, numerous specific details are set forth. It will be understood, however, that embodiments of the invention may be practiced without these specific details. In some instances, well-known methods, structures and techniques have not been shown in detail in order not to obscure an understanding of this description.
此外,本领域普通技术人员能够理解,尽管在此所述的一些实施例包括其它实施例中所包括的某些特征而不是其它特征,但是不同实施例的特征的组合意味着处于本发明的范围之内并且形成不同的实施例。例如,在权利要求书中,所要求保护的实施例的任意之一都可以以任意的组合方式来使用。Furthermore, it will be understood by those of ordinary skill in the art that although some of the embodiments described herein include certain features, but not others, included in other embodiments, that combinations of features of different embodiments are intended to be within the scope of the invention within and form different embodiments. For example, in the claims, any of the claimed embodiments may be used in any combination.
本领域技术人员应理解,尽管已经参考示例性实施例描述了本发明,但是在不脱离本发明的范围的情况下,可进行各种改变并可用等同物替换其元件。另外,在不脱离本发明的实质范围的情况下,可进行许多修改以使特定情况或材料适应本发明的教导。因此,本发明不限于所公开的特定实施例,而是本发明将包括落入所附权利要求范围内的所有实施例。It will be understood by those skilled in the art that although the invention has been described with reference to exemplary embodiments, various changes may be made and equivalents may be substituted for elements thereof without departing from the scope of the invention. In addition, many modifications may be made to adapt a particular situation or material to the teachings of the invention without departing from the essential scope thereof. Therefore, the inventions are not to be limited to the particular embodiments disclosed, but the inventions are to include all embodiments falling within the scope of the appended claims.
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