CN111744366A - A device and method for testing oxygen transfer performance of MABR membrane - Google Patents
A device and method for testing oxygen transfer performance of MABR membrane Download PDFInfo
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Abstract
Description
技术领域technical field
本发明属于污水处理领域,更具体地说,涉及一种测试MABR膜传氧性能的装置及方法。The invention belongs to the field of sewage treatment, and more particularly relates to a device and method for testing the oxygen transfer performance of MABR membranes.
背景技术Background technique
在污水处理领域,好氧曝气是非常重要的环节,所采用的曝气形式和设备多种多样,在工程应用前对曝气设备和曝气形式的优劣判断十分必要。In the field of sewage treatment, aerobic aeration is a very important link, and various aeration forms and equipment are used. It is necessary to judge the pros and cons of aeration equipment and aeration forms before engineering application.
MABR技术是一种以透氧膜材料作为传氧介质的无泡曝气污水处理工艺。MABR技术的优势在于利用膜材料的高透氧性能和膜两侧的氧浓度差并且采用无泡曝气的形式,富氧空气不直接与水体接触,而是利用膜材料的渗透原理,分子级氧由膜的富氧侧向低氧的水体内传质,相比于一般微孔曝气形式所需的气量极少,氧利用率和传氧动力效率极高。测试MABR膜的传氧性能高低,对于MABR技术的设计和应用都非常有意义。MABR technology is a non-foam aeration sewage treatment process using oxygen permeable membrane material as oxygen transfer medium. The advantage of MABR technology is that it utilizes the high oxygen permeability of the membrane material and the oxygen concentration difference on both sides of the membrane and adopts the form of non-foam aeration. The mass transfer of oxygen from the oxygen-enriched side of the membrane to the hypoxic water body requires very little air volume compared to the general microporous aeration form, and the oxygen utilization rate and oxygen transfer kinetic efficiency are extremely high. Testing the oxygen transfer performance of MABR membrane is very meaningful for the design and application of MABR technology.
经检索发现,申请号201510223267.1,申请日为2015年5月5日的中国发明专利申请公开了一种曝气充氧装置及其检测液体充氧能力的方法,所述曝气充氧装置包括容器,设置在容器内的曝气装置,所述容器内还设有检测容器内液体氧气浓度的溶氧仪;所述鼓风装置通过管道与鼓风装置连通;所述管道上装有检测风量的流量计以及检测风压的压力计;After searching, it was found that the Chinese invention patent application with the application number of 201510223267.1 and the application date of May 5, 2015 discloses an aeration and oxygenation device and a method for detecting the oxygenation capacity of a liquid. The aeration and oxygenation device includes a container. , an aeration device arranged in the container, and the container is also provided with a dissolved oxygen meter for detecting the concentration of liquid oxygen in the container; the blowing device is communicated with the blowing device through a pipeline; the pipeline is equipped with a flow rate for detecting the air volume Gauge and pressure gauge for detecting wind pressure;
该发明通过利用上述的曝气充氧装置对液体充氧能力进行检测,检测步骤包括先给容器内充液体,并投加脱氧剂,直到溶氧仪读数为0mg/L,而后开启鼓风装置,通过位于容器内的曝气装置向容器内充氧,同时通过压力计观察曝气压力,通过流量计观测风量;最后通过溶氧仪记录容器内液体中饱和溶解氧浓度Cs和运行温度下溶解氧浓度Ct,获得容器内液体充氧能力,并进一步地获得容器内液体的氧利用率E和容器内液体的动力效率Ep,实现了就地观测曝气溶氧情况,曝气底部基质反应区域,气水搅拌效果等,其曝气充氧装置上的溶氧仪快捷测定曝气器充氧性能,为污废水处理工程运行提供理论与技术支持。The invention detects the oxygenation capacity of the liquid by using the above-mentioned aeration and oxygenation device, and the detection step includes filling the container with liquid first, and adding a deoxidizer until the reading of the dissolved oxygen meter is 0 mg/L, and then turning on the blowing device. , fill the container with oxygen through the aeration device located in the container, at the same time observe the aeration pressure through the pressure gauge, and observe the air volume through the flow meter; finally, the saturated dissolved oxygen concentration Cs in the liquid in the container and the dissolved oxygen at the operating temperature are recorded by the dissolved oxygen meter. The oxygen concentration Ct can obtain the oxygenation capacity of the liquid in the container, and further obtain the oxygen utilization rate E of the liquid in the container and the dynamic efficiency E p of the liquid in the container, and realize the on-site observation of the dissolved oxygen in aeration and the reaction of the matrix at the bottom of the aeration. The dissolved oxygen meter on the aeration and oxygenation device can quickly measure the oxygenation performance of the aerator, and provide theoretical and technical support for the operation of sewage treatment projects.
但由于MABR的传氧模型特殊,一般曝气装置的充氧性能检测方法不适合标准化比较和判断MABR曝气材料的传氧性能。因此,需要寻找一种适用于测试MABR膜传氧性能的方法来研究该类型曝气向水体内转移氧的规律,为MABR膜材料的开发和设计应用提供可靠的理论依据。However, due to the special oxygen transfer model of MABR, the oxygenation performance detection method of general aeration devices is not suitable for standardized comparison and judgment of the oxygen transfer performance of MABR aeration materials. Therefore, it is necessary to find a method suitable for testing the oxygen transfer performance of MABR membranes to study the law of oxygen transfer to the water body by this type of aeration, and to provide a reliable theoretical basis for the development and design of MABR membrane materials.
发明内容SUMMARY OF THE INVENTION
1.要解决的问题1. The problem to be solved
针对现有技术中检测装置无法检测MABR曝气材料的传氧性能的问题,本发明提供一种测试MABR膜传氧性能的装置及方法。本发明通过构建设计一套检测装置和标准的测定方法,用以测定MABR膜材料的曝气传氧性能,并计算其相关的传氧参数,为研究MABR膜材料的氧转移规律及材料开发和设计应用提供可靠的理论依据。Aiming at the problem that the detection device in the prior art cannot detect the oxygen transfer performance of the MABR aeration material, the present invention provides a device and method for testing the oxygen transfer performance of the MABR membrane. The invention constructs and designs a set of detection devices and a standard measurement method to measure the aeration oxygen transfer performance of the MABR membrane material, and calculate the relevant oxygen transfer parameters, so as to study the oxygen transfer law of the MABR membrane material and the development and improvement of the material. The design application provides a reliable theoretical basis.
2.技术方案2. Technical solutions
为了解决上述问题,本发明所采用的技术方案如下:In order to solve the above problems, the technical scheme adopted in the present invention is as follows:
本发明的一种测试MABR膜传氧性能的装置,包括反应器本体、循环单元、供气单元和进水单元,所述反应器本体顶部设置有第一循环口,所述第一循环口通过第一循环管道与循环单元相连;反应器本体底部设置有第二循环口,所述第二循环口通过第二循环管道与循环单元相连;并且A device for testing the oxygen transfer performance of a MABR membrane of the present invention includes a reactor body, a circulation unit, an air supply unit and a water inlet unit. The top of the reactor body is provided with a first circulation port, and the first circulation port passes through The first circulation pipe is connected with the circulation unit; the bottom of the reactor body is provided with a second circulation port, and the second circulation port is connected with the circulation unit through the second circulation pipe; and
反应器本体内部设置有MABR膜,MABR膜上方设置有进气主管,进气主管的一端通过供气管道与供气单元相连,MABR膜下方设置有出气集管,出气集管的一端与排气管道相连;A MABR membrane is arranged inside the reactor body, an inlet main pipe is arranged above the MABR membrane, one end of the inlet main pipe is connected to the air supply unit through an air supply pipe, an outlet manifold is arranged below the MABR membrane, and one end of the outlet manifold is connected to the exhaust gas. connected pipes
其中,第一循环管道上设置有加料管道,并且第二循环管道上设置有进水管道和取样管道,所述进水管道与进水单元相连。Wherein, the first circulation pipe is provided with a feeding pipe, and the second circulation pipe is provided with a water inlet pipe and a sampling pipe, and the water inlet pipe is connected with the water inlet unit.
优选地,所述反应器本体上设置有溶氧仪。Preferably, the reactor body is provided with a dissolved oxygen meter.
优选地,所述第一循环管道上设置有第一循环阀,并且所述第二循环管道上设置有第二循环阀。Preferably, the first circulation pipe is provided with a first circulation valve, and the second circulation pipe is provided with a second circulation valve.
优选地,所述供气管道上设置有第一调节阀,所述排气管道上设置有第二调节阀。Preferably, the air supply pipeline is provided with a first regulating valve, and the exhaust pipeline is provided with a second regulating valve.
优选地,所述进水管道上设置有进水阀,所述加料管道上设置有加料阀,并且所述取样管道上设置有取样阀。Preferably, the water inlet pipe is provided with a water inlet valve, the feed pipe is provided with a feed valve, and the sampling pipe is provided with a sampling valve.
优选地,在供气单元与第一调节阀之间的供气管道上设置有流量计,并且在出气集管与第二调节阀之间的排气管道上设置有压力传感器。Preferably, a flow meter is provided on the air supply pipeline between the air supply unit and the first regulating valve, and a pressure sensor is provided on the exhaust pipeline between the air outlet header and the second regulating valve.
本发明的采用上述的一种测试MABR膜传氧性能的装置进行MABR膜传氧性能测试的方法,所述方法包括以下步骤:The present invention adopts the above-mentioned device for testing the oxygen transfer performance of the MABR film to carry out the method for testing the oxygen transfer performance of the MABR film, and the method comprises the following steps:
S10、脱氧:将水灌满整个反应器本体,而后向反应器本体内投加脱氧剂和催化剂,开启循环单元,使反应器本体内的水与脱氧剂和催化剂均匀混合,进行脱氧反应;S10, deoxygenation: fill the entire reactor body with water, then add deoxidizer and catalyst into the reactor body, open the circulation unit, and make the water in the reactor body evenly mix with the deoxidizer and catalyst to carry out deoxidation reaction;
S20、曝气:当反应器本体内的水中溶解氧浓度为0时,对反应器本体内的水进行取样,并检测水中的SO4 2-浓度,作为曝气零点反应器本体内的初始SO4 2-浓度,而后开启供气单元向MABR膜供气,通过MABR膜向反应器本体曝气,每隔4-6min取样并检测反应器本体内的水中溶解氧浓度和SO4 2-浓度,曝气1-3h或水体内溶解氧含量不再升高时停止测试;S20. Aeration: when the dissolved oxygen concentration in the water in the reactor body is 0, the water in the reactor body is sampled, and the SO 4 2- concentration in the water is detected as the initial SO in the aeration zero-point reactor body 4 2- concentration, then open the air supply unit to supply air to the MABR membrane, aerate the reactor body through the MABR membrane, take samples every 4-6min and detect the dissolved oxygen concentration and SO 4 2- concentration in the water in the reactor body, Stop the test after aeration for 1-3 hours or when the dissolved oxygen content in the water no longer rises;
S30、计算:根据以下公式(1)至(3),分别计算MABR膜曝气氧总转移系数Kla、单位MABR膜面积传氧速率OTR和MABR膜传氧动力效率Ep,S30. Calculation: According to the following formulas (1) to (3), calculate the total oxygen transfer coefficient Kla of the MABR membrane, the oxygen transfer rate OTR per unit area of the MABR membrane, and the oxygen transfer kinetic efficiency Ep of the MABR membrane, respectively,
其中:in:
t-t0:曝气时间,min;tt 0 : aeration time, min;
C0:曝气零点反应器本体内的溶解氧浓度,mg/L;C 0 : dissolved oxygen concentration in the aeration zero-point reactor body, mg/L;
Cs:曝气温度下饱和溶解氧值,mg/L;Cs: saturated dissolved oxygen value at aeration temperature, mg/L;
Ct:曝气时间为t时,反应器本体内溶解氧值,mg/L;Ct: When the aeration time is t, the dissolved oxygen value in the reactor body, mg/L;
Nt:曝气时间为t时,反应器本体内SO4 2-浓度,mg/L;Nt: SO 4 2- concentration in the reactor body when the aeration time is t, mg/L;
N0:曝气零点反应器本体内的SO4 2-浓度,mg/L;N 0 : SO 4 2- concentration in the aeration zero-point reactor body, mg/L;
S:测试的MABR膜的膜面积,m2;S: membrane area of the tested MABR membrane, m 2 ;
V:反应器本体的有效容积,L;V: the effective volume of the reactor body, L;
P:供气单元的功率,kw。P: Power of air supply unit, kw.
优选地,在步骤S10中,反应器本体(100)内的水中的溶解氧与所投加的脱氧剂之间的质量比为1:7~1:9。Preferably, in step S10, the mass ratio between the dissolved oxygen in the water in the reactor body (100) and the added deoxidizer is 1:7 to 1:9.
优选地,在步骤S20中,开启供气单元(300)向MABR膜(110)供气,其中控制MABR膜(110)内部的压力为15-20kPa。Preferably, in step S20, the gas supply unit (300) is turned on to supply gas to the MABR membrane (110), wherein the pressure inside the MABR membrane (110) is controlled to be 15-20 kPa.
优选地,在步骤S30中,采用以下公式(4)对MABR膜曝气氧总转移系数Kla进行温度校正,得到校正后的MABR膜曝气氧总转移系数Kla,Preferably, in step S30, the following formula (4) is used to perform temperature correction on the total aeration oxygen transfer coefficient Kla of the MABR film, to obtain the corrected total aeration oxygen transfer coefficient Kla of the MABR film,
Kla(20℃)=Kla(T)·1.024T-20 (4)Kla(20℃)=Kla(T)·1.024 T-20 (4)
其中:T为MABR膜的曝气温度。Where: T is the aeration temperature of the MABR film.
3.有益效果3. Beneficial effects
相比于现有技术,本发明的有益效果为:Compared with the prior art, the beneficial effects of the present invention are:
(1)本发明的一种测试MABR膜传氧性能的装置,包括反应器本体、循环单元和供气单元,反应器本体内部设置有MABR膜,供气单元向MABR膜供气,并且循环单元确保在没有足够的气泡扰动下反应器本体内部的水流达到混合效果,这相比于传统微孔曝气和机械曝气充氧性能测试,不受到其曝气器安装水深以及敞口气液接触面传质的影响,同时保证无泡曝气状态下的系统内液相均匀混合,从而使MABR膜传氧保持稳定的浓度梯度,更利于研究其传氧性能和规律;(1) A device for testing the oxygen transfer performance of a MABR membrane of the present invention includes a reactor body, a circulation unit and a gas supply unit, the reactor body is provided with a MABR membrane, the gas supply unit supplies gas to the MABR membrane, and the circulation unit Ensure that the water flow inside the reactor body achieves a mixing effect without sufficient bubble disturbance. Compared with the traditional microporous aeration and mechanical aeration oxygenation performance tests, it is not affected by the installation depth of the aerator and the open air-liquid contact surface. At the same time, it can ensure the uniform mixing of the liquid phase in the system under the condition of bubble-free aeration, so that the oxygen transfer of the MABR membrane maintains a stable concentration gradient, which is more conducive to the study of its oxygen transfer performance and law;
(2)本发明的一种测试MABR膜传氧性能的装置,是一套全封闭式的装置,以防止空气和水相的气液接触面存在氧气传递,影响实验数据的准确性;(2) A device for testing the oxygen transfer performance of MABR membranes of the present invention is a fully enclosed device to prevent oxygen transfer on the gas-liquid contact surface of the air and the water phase, which affects the accuracy of the experimental data;
(3)本发明的一种测试MABR膜传氧性能的方法,克服了传统充氧测试方法中未考虑过量的脱氧剂与部分传质的氧继续反应的影响,提出了适用于MABR特殊传氧曝气模型的传氧性能测试方法,并对MABR膜曝气的各项性能作精确测算。(3) A method for testing the oxygen transfer performance of MABR membrane of the present invention overcomes the influence of the continuous reaction between excess deoxidizer and partial mass transfer oxygen that is not considered in the traditional oxygenation test method, and proposes a special oxygen transfer method suitable for MABR. Test method for oxygen transfer performance of aeration model, and accurately measure the performance of MABR membrane aeration.
附图说明Description of drawings
图1为本发明的一种测试MABR膜传氧性能的装置的结构示意图;1 is a schematic structural diagram of a device for testing the oxygen transfer performance of MABR membranes according to the present invention;
图中:In the picture:
100、反应器本体;110、MABR膜;111、进气主管;100, reactor body; 110, MABR membrane; 111, intake main pipe;
112、出气集管;120、溶氧仪;200、循环单元;112, outlet manifold; 120, dissolved oxygen meter; 200, circulation unit;
201、第一循环口;202、第二循环口;210、第一循环管道;201, the first circulation port; 202, the second circulation port; 210, the first circulation pipeline;
211、第一循环阀;220、第二循环管道;221、第二循环阀;211, the first circulation valve; 220, the second circulation pipeline; 221, the second circulation valve;
300、供气单元;310、供气管道;311、第一调节阀;300, air supply unit; 310, air supply pipeline; 311, first regulating valve;
312、流量计;320、排气管道;321、第二调节阀;322、压力传感器;312, flow meter; 320, exhaust pipe; 321, second regulating valve; 322, pressure sensor;
400、进水单元;410、进水管道;411、进水阀;400, water inlet unit; 410, water inlet pipe; 411, water inlet valve;
510、加料管道;511、加料阀;610、取样管道;611、取样阀。510, feeding pipeline; 511, feeding valve; 610, sampling pipeline; 611, sampling valve.
具体实施方式Detailed ways
下面结合具体实施例对本发明进一步进行描述。The present invention will be further described below with reference to specific embodiments.
如图1所示,本发明的一种测试MABR膜传氧性能的装置,包括反应器本体100、循环单元200、供气单元300和进水单元400;通常,反应器本体100的规格(长×宽×高)为30cm×10cm×1200cm,并且循环单元200为循环泵,供气单元300为供气风机,进水单元400为进水泵;As shown in FIG. 1, a device for testing the oxygen transfer performance of MABR membrane according to the present invention includes a
所述反应器本体100顶部设置有第一循环口201,所述第一循环口201通过第一循环管道210与循环单元200相连,并且在第一循环管道210上设置有第一循环阀211,通过开启或关闭第一循环阀211对第一循环口201进行控制;第一循环管道210上还设置有加料管道510,用于向反应器本体100投加脱氧剂、催化剂等物料,并且在所述加料管道510上设置有加料阀511,通过开启或关闭加料阀511来控制物料投加;The top of the
反应器本体100底部设置有第二循环口202,所述第二循环口202通过第二循环管道220与循环单元200相连,在第二循环管道220上设置有第二循环阀221,通过开启或关闭第二循环阀221对第二循环口202进行控制;第二循环管道220上还设置有进水管道410和取样管道610,所述进水管道410与进水单元400相连,通过进水单元400向反应器本体100泵入清水,并且进水管道410上设置有进水阀411,取样管道610上设置有取样阀611,通过分别控制进水阀411和取样阀611的开关,进而控制进水和取样操作;并且The bottom of the
反应器本体100内部设置有MABR膜110,通常MABR膜110为一片中空纤维帘式膜,其在反应器本体100内的装填面积约为2-8m2;并且MABR膜110上方设置有进气主管111,进气主管111的一端通过供气管道310与供气单元300相连,所述供气管道310上设置有第一调节阀311,用于对进气主管111进行供气控制;此外,在供气单元300与第一调节阀311之间的供气管道310上还设置有流量计312,用于实时监控供气流量,并根据信号反馈对供气单元300实现变频控制,稳定供气流量;The
MABR膜110下方设置有出气集管112,出气集管112的一端与排气管道320相连,并且排气管道320上设置有第二调节阀321,用于控制MABR膜110内的压力;优选地,第二调节阀321为一种电动调节阀,并且在出气集管112与第二调节阀321之间的排气管道320上设置有压力传感器322,通过压力传感器322的信号对第二调节阀321的开关度进行调节,从而稳定精确控制膜内压力,一般情况下,将膜内压力控制在15-20kPa范围内。An
此外,在反应器本体100上可以设置有溶氧仪120,用于实时监控反应器本体100内水体溶解氧浓度变化情况。由于本发明的装置包括循环单元200,使得反应器本体100内水体均匀混合,溶氧仪120可以设置在反应器本体100的任何位置处。In addition, a dissolved
一种采用上述测试MABR膜传氧性能的装置进行MABR膜传氧性能测试的方法,所述方法包括以下步骤:A method for testing the oxygen transfer performance of a MABR film using the above-mentioned device for testing the oxygen transfer performance of the MABR film, the method comprising the following steps:
S10、脱氧:开启第一循环阀211和进水阀411,通过进水单元400将水泵入进水管道410,而后进入第二循环管道220,经由循环单元200进入第一循环管道210,自下而上从第一循环口201填充进入反应器本体100,直到灌满整个反应器本体100;S10, deoxygenation: open the
而后关闭进水阀411,开启加料阀511,通过加料管道510向反应器本体100内投加脱氧剂和催化剂,其中所述脱氧剂为亚硫酸钠,基于反应器本体100内水体溶解氧的量,所投加的脱氧剂的量通常是过量的,优选地,反应器本体100内水体溶解氧与脱氧剂的质量比为1:7~1:9;并且所述催化剂为氯化钴,投加量为投加后反应器本体内钴离子浓度为约0.05~0.5mg/L;Then close the
关闭加料阀511,开启第二循环阀221,通过循环单元200使反应器本体100内的水与脱氧剂和催化剂均匀混合,进行脱氧反应,等待溶氧仪120的示数为0,其中反应器本体100内部实现由上至下的循环,循环流量设计为300-500L/h,以保证反应器本体100内的水体均匀混合;Close the feeding
S20、曝气:当反应器本体100内的水中溶解氧浓度为0时,开启取样阀611,通过取样管道610对反应器本体100内的水进行取样,取样体积为2mL,并检测该水样中的SO4 2-浓度,作为曝气零点反应器本体内的初始SO4 2-浓度,S20. Aeration: when the dissolved oxygen concentration in the water in the
而后开启分别供气单元300、第一调节阀311和第二调节阀321,向MABR膜110上方设置的进气主管111进行供气,经由进气主管111,气体进入MABR膜110,实现MABR膜向反应器本体100曝气,剩余尾气通过出气集管112进入排气管道320排出反应器外,并且在曝气过程中,通过流量计312、第二调节阀321和压力传感器322,控制运行中的供气流量和膜内压力,一般控制膜内压力为15-20kPa;每隔4-6min,优选5min读取溶氧仪120的示数并取样检测反应器本体100内水体的SO4 2-浓度,在曝气1-3h,优选2h后或当水体内溶解氧含量不再升高时停止测试,关闭所有阀门;Then, the
S30、计算:根据以下公式(1)至(3),分别计算MABR膜曝气氧总转移系数Kla、单位MABR膜面积传氧速率OTR和MABR膜传氧动力效率Ep,S30. Calculation: According to the following formulas (1) to (3), calculate the total oxygen transfer coefficient Kla of the MABR membrane, the oxygen transfer rate OTR per unit area of the MABR membrane, and the oxygen transfer kinetic efficiency Ep of the MABR membrane, respectively,
其中:in:
t-t0:曝气时间,min;tt 0 : aeration time, min;
C0:曝气零点反应器本体内的溶解氧浓度,mg/L;C 0 : dissolved oxygen concentration in the aeration zero-point reactor body, mg/L;
Cs:曝气温度下饱和溶解氧值,mg/L;Cs: saturated dissolved oxygen value at aeration temperature, mg/L;
Ct:曝气时间为t时,反应器本体内溶解氧值,mg/L;Ct: When the aeration time is t, the dissolved oxygen value in the reactor body, mg/L;
Nt:曝气时间为t时,反应器本体内SO4 2-浓度,mg/L;Nt: SO 4 2- concentration in the reactor body when the aeration time is t, mg/L;
N0:曝气零点反应器本体内的SO4 2-浓度,mg/L;N 0 : SO 4 2- concentration in the aeration zero-point reactor body, mg/L;
S:测试的MABR膜的膜面积,m2;S: membrane area of the tested MABR membrane, m 2 ;
V:反应器本体的有效容积,L;V: the effective volume of the reactor body, L;
P:供气单元的功率,kw。P: Power of air supply unit, kw.
需要说明的是,可以对计算得到的MABR膜曝气氧总转移系数Kla进行温度校正,如下式(4)所示:It should be noted that temperature correction can be performed on the calculated total aeration oxygen transfer coefficient Kla of the MABR film, as shown in the following formula (4):
Kla(20℃)=Kla(T)·1.024T-20 (4)Kla(20℃)=Kla(T)·1.024 T-20 (4)
其中:T为MABR膜的曝气温度,得到校正后的MABR膜曝气氧总转移系数Kla。Where: T is the aeration temperature of the MABR membrane, and the corrected total oxygen transfer coefficient Kla of the MABR membrane aeration is obtained.
本发明通过采用适用于MABR特殊传氧曝气模型的传氧性能测试装置进行MABR膜传氧性能测试,排除了一般传氧检测过程中存在的水深、空气接触等误差,并且对使用过量脱氧剂继续发生的氧化还原反应作了测试和计算,实现了在同一标准下对MABR膜曝气的各项性能的精确测算,为研究MABR膜材料的氧转移规律以及材料开发和设计应用提供可靠的理论依据。By adopting the oxygen transfer performance testing device suitable for the special oxygen transfer aeration model of MABR to test the oxygen transfer performance of the MABR membrane, the present invention eliminates errors such as water depth and air contact in the general oxygen transfer detection process, and eliminates the use of excessive deoxidizers. The redox reactions that continue to occur are tested and calculated, and the accurate measurement of the performance of MABR membrane aeration under the same standard is achieved, which provides a reliable theory for the study of the oxygen transfer law of MABR membrane materials and the development and design of materials. in accordance with.
实施例1Example 1
本实施例的一种测试MABR膜传氧性能的装置,反应器本体100的规格(长×宽×高)为30cm×10cm×1200cm,反应器本体100内安装的MABR膜110为PTFE材质,孔径为0.5μm,膜面积为4m2,装填密度为111.11m2/m3。A device for testing the oxygen transfer performance of a MABR membrane in this embodiment, the size of the reactor body 100 (length×width×height) is 30cm×10cm×1200cm, the
在采用本实施例的装置进行MABR膜传氧性能测试的过程中,传氧性能测试的运行条件为曝气量:Q=1L/min;尾端排气压力(膜内压力):P=20kpa;亚硫酸钠投加量:3.5g(反应器本体100内水体溶解氧与脱氧剂的质量比为1:8);催化剂氯化钴的投加量:0.047g。In the process of using the device of this embodiment to test the oxygen transfer performance of the MABR membrane, the operating conditions of the oxygen transfer performance test are: aeration volume: Q=1L/min; exhaust pressure at the tail end (intra-membrane pressure): P=20kpa ; Dosing amount of sodium sulfite: 3.5g (the mass ratio of water body dissolved oxygen and deoxidizer in
开始测试后,按照如下表1,每5min记录运行和检测数据。After starting the test, according to the following Table 1, record the running and detection data every 5min.
表1测试过程中记录的运行和检测数据Table 1 Operational and inspection data recorded during the test
将检测数据代入公式(1)至(3)中计算该种类PTFE材质的MABR膜材料的传氧参数如下:Kla=0.458min-1;OTR=0.0371g O2/(m2·min);Ep=2.54kg O2/kwh。Substitute the detection data into formulas (1) to (3) to calculate the oxygen transfer parameters of the MABR membrane material of this kind of PTFE material as follows: Kla=0.458min −1 ; OTR=0.0371g O 2 /(m 2 ·min); Ep = 2.54 kg O 2 /kwh.
对比例1Comparative Example 1
本对比例的基本内容同实施例1,不同之处在于:本对比例采用传统测试曝气盘的方法(化学消氧法《CJ/T3015.2-1993》)和装置进行MABR膜传氧性能测试。The basic content of this comparative example is the same as that of Example 1, the difference is that: this comparative example adopts the traditional method of testing aeration discs (chemical deoxidation method "CJ/T3015.2-1993") and device to carry out the oxygen transfer performance of MABR membrane test.
具体检测方法如下:The specific detection method is as follows:
化学消氧法是在清水中投加一定数量的亚硫酸钢,并配氯化钴作为催化剂,将水中的溶解氧去除,随后开始曝气并记录分析数据,直到溶解氧达到饱和并满足《CJ/T3015.2-1993》所要求的20min内溶解氧增幅小于0.1mg/L,或者15min内基本保持不变时结束测试。采用线性及非线性回归方法进行处理数据并比对分析。The chemical deoxidization method is to add a certain amount of sodium sulfite to the clean water, and mix cobalt chloride as a catalyst to remove the dissolved oxygen in the water, then start aeration and record the analysis data until the dissolved oxygen reaches saturation and meets the requirements of "CJ". /T3015.2-1993", when the increase of dissolved oxygen within 20min is less than 0.1mg/L, or when it remains basically unchanged within 15min, end the test. Linear and nonlinear regression methods were used to process data and compare and analyze.
用此方法对PTFE材质的MABR膜进行了传氧测试并计算得到以下传氧参数:Kla=0.254min-1;OTR=0.0182g O2/(m2·min);Ep=1.32kg O2/kwh。The oxygen transfer test was carried out on the MABR membrane made of PTFE by this method, and the following oxygen transfer parameters were calculated: Kla=0.254min -1 ; OTR=0.0182g O 2 /(m 2 ·min); Ep=1.32kg O 2 / kwh.
与实施例1中的计算结果相比,本对比例采用传统化学需氧方法的测试装置和方法计算得到的各项传氧参数较低,且两者相差较大。分析其原因,本发明的MABR膜传氧性能测试装置和方法考虑到了无泡曝气时水体循环不畅导致膜局部膜表面溶氧过高,传氧浓度梯度变低,MABR传氧能力受阻的情况,因此,本发明的装置和方法更准确地反映了MABR的传氧性能。Compared with the calculation results in Example 1, the oxygen transfer parameters calculated by the test device and method of the traditional chemical oxygen demand method in this comparative example are lower, and the difference between the two is relatively large. Analyzing the reasons, the device and method for testing the oxygen transfer performance of MABR membranes of the present invention take into account the fact that the water circulation is not smooth during bubble-free aeration, resulting in excessively high dissolved oxygen on the local membrane surface of the membrane, lowering the oxygen transfer concentration gradient, and hindering the oxygen transfer capacity of MABR. Therefore, the apparatus and method of the present invention more accurately reflect the oxygen transfer performance of MABR.
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