CN110078245A - A kind of systemic circulation multiplying power concentrate recirculation embrane method Sewage treatment reclaiming system - Google Patents
A kind of systemic circulation multiplying power concentrate recirculation embrane method Sewage treatment reclaiming system Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 16
- 239000012141 concentrate Substances 0.000 title 1
- 239000010865 sewage Substances 0.000 title 1
- 230000001839 systemic circulation Effects 0.000 title 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 147
- 239000012528 membrane Substances 0.000 claims abstract description 90
- 238000001223 reverse osmosis Methods 0.000 claims abstract description 65
- 239000002351 wastewater Substances 0.000 claims abstract description 23
- 239000013505 freshwater Substances 0.000 claims description 14
- 238000004064 recycling Methods 0.000 claims description 9
- 238000010992 reflux Methods 0.000 claims description 7
- 238000006243 chemical reaction Methods 0.000 claims description 5
- 239000005416 organic matter Substances 0.000 abstract description 18
- 239000007788 liquid Substances 0.000 abstract description 8
- 238000011084 recovery Methods 0.000 abstract description 3
- 239000000126 substance Substances 0.000 abstract description 2
- 239000000463 material Substances 0.000 description 6
- 239000002245 particle Substances 0.000 description 5
- 238000004140 cleaning Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 239000012530 fluid Substances 0.000 description 4
- 238000012423 maintenance Methods 0.000 description 4
- 230000003204 osmotic effect Effects 0.000 description 4
- 230000009466 transformation Effects 0.000 description 4
- 238000013461 design Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000005457 optimization Methods 0.000 description 3
- 239000013618 particulate matter Substances 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000003911 water pollution Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
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- 238000009776 industrial production Methods 0.000 description 1
- 239000010842 industrial wastewater Substances 0.000 description 1
- 239000013067 intermediate product Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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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
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
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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
- C02F1/441—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by reverse osmosis
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Abstract
本发明公开了一种大循环倍率浓水回流膜法废水回收回用系统，包括废水进口、低压泵、第一水管、保安过滤器、高压泵、反渗透膜壳、反渗透膜、大流量自循环泵、补水口、浓水排放口、支撑层和第二水管。本发明可以避免出现普通反渗透膜系统水流速度较低，极易在反渗透膜表面附着有机物或垢类的问题，同时可以兼顾了整个系统的压力平衡与物料平衡，能够使反渗透膜在极其恶劣水质条件下的运行得到优化，能够保障反渗透膜在高硬度、高浊度、高有机物浓度、高色度条件下的持续稳定运行，尤其适用于极其恶劣水质条件下废水排放企事业单位的中水回用或零液排放项目，对提高水资源利用率具有极大的促进意义。
The invention discloses a waste water recovery and reuse system with a large cycle rate concentrated water backflow membrane method, which includes a waste water inlet, a low-pressure pump, a first water pipe, a security filter, a high-pressure pump, a reverse osmosis membrane shell, a reverse osmosis membrane, a large flow automatic Circulation pump, water supply port, concentrated water discharge port, support layer and second water pipe. The invention can avoid the problem that the water flow rate of the ordinary reverse osmosis membrane system is low, and it is very easy to attach organic substances or scales on the surface of the reverse osmosis membrane. The operation under harsh water quality conditions is optimized, which can ensure the continuous and stable operation of the reverse osmosis membrane under the conditions of high hardness, high turbidity, high organic matter concentration, and high chromaticity, especially suitable for wastewater discharge enterprises and institutions under extremely bad water quality conditions Reclaimed water reuse or zero liquid discharge projects are of great significance for improving the utilization rate of water resources.
Description
技术领域technical field
本发明涉及废水回收回用技术领域，尤其是涉及一种大循环倍率浓水回流膜法废水回收回用系统。The invention relates to the technical field of waste water recovery and reuse, in particular to a waste water recovery and reuse system with a large circulation ratio concentrated water reflux membrane method.
背景技术Background technique
工业废水，指工艺生产过程中排出的废水和废液，其中含有随水流失的工业生产用料、中间产物、副产品以及生产过程中产生的污染物，是造成环境污染，特别是水污染的重要原因，所以就需要对废水回收回用，防止水污染，但现有废水回收回用系统中的水流速度较低，极易在反渗透膜表面附着有机物或垢类的问题，且不能够保障反渗透膜在高硬度、高浊度、高有机物浓度、高色度条件下的持续稳定运行，人工清洗周期较短，极大地增加了运行维护人员劳动强度且降低膜系统寿命，不能适用于极其恶劣水质条件下废水排放企事业单位的中水回用或零液排放项目，使水资源利用率不高。Industrial wastewater refers to the wastewater and waste liquid discharged during the production process, which contains industrial production materials, intermediate products, by-products and pollutants generated during the production process that are lost with water, and is an important source of environmental pollution, especially water pollution. Therefore, it is necessary to recycle waste water to prevent water pollution, but the water flow rate in the existing waste water recycle system is low, and it is very easy to attach organic matter or scale to the surface of the reverse osmosis membrane, and it cannot guarantee the reverse osmosis membrane surface. The continuous and stable operation of the permeable membrane under the conditions of high hardness, high turbidity, high organic concentration, and high chroma, and the short cycle of manual cleaning greatly increase the labor intensity of operation and maintenance personnel and reduce the life of the membrane system, which cannot be applied to extremely harsh conditions. Under the condition of water quality, the reclaimed water reuse or zero liquid discharge projects of enterprises and institutions that discharge waste water make the utilization rate of water resources not high.
发明内容SUMMARY OF THE INVENTION
针对上述情况，为克服现有技术的缺陷，本发明提供一种大循环倍率浓水回流膜法废水回收回用系统，解决了现有废水回收回用系统中的水流速度较低，极易在反渗透膜表面附着有机物或垢类的问题，且不能够保障反渗透膜在高硬度、高浊度、高有机物浓度、高色度条件下的持续稳定运行，人工清洗周期较短，极大地增加了运行维护人员劳动强度且降低膜系统寿命，不能适用于极其恶劣水质条件下废水排放企事业单位的中水回用或零液排放项目，使水资源利用率不高的问题。In view of the above situation, in order to overcome the defects of the prior art, the present invention provides a large cycle rate concentrated water reflux membrane method wastewater recycling system, which solves the problem that the water flow rate in the existing wastewater recycling system is low, and it is very easy to The problem of organic matter or scale attached to the surface of the reverse osmosis membrane cannot guarantee the continuous and stable operation of the reverse osmosis membrane under the conditions of high hardness, high turbidity, high organic concentration, and high chroma. The manual cleaning cycle is short, which greatly increases the It reduces the labor intensity of operation and maintenance personnel and reduces the life of the membrane system. It cannot be applied to the reclaimed water reuse or zero liquid discharge projects of wastewater discharge enterprises and institutions under extremely bad water quality conditions, which makes the utilization rate of water resources not high.
为实现上述目的，本发明提供如下技术方案：本发明包括废水进口、低压泵、第一水管、保安过滤器、高压泵、反渗透膜壳、反渗透膜、大流量自循环泵、补水口、浓水排放口、支撑层和第二水管，所述废水进口的出水端通过第一水管与低压泵的进水端连接，低压泵的出水端通过第一水管与保安过滤器的进水端连接，保安过滤器的出水端通过第一水管与高压泵的进水端连接，反渗透膜壳的一侧为浓水侧，反渗透膜壳的另一侧为淡水侧，浓水侧通过第二水管首尾相连形成闭合管路，第二水管的中部设置有大流量自循环泵，大流量自循环泵的进水侧设置有补水口，补水口通过第一水管与高压泵出水端连接，大流量自循环泵的出水侧设置有浓水排放口，反渗透膜的膜壳的内部设置有反渗透膜，反渗透膜流道之间夹持有支撑层。In order to achieve the above object, the present invention provides the following technical solutions: the present invention includes a waste water inlet, a low pressure pump, a first water pipe, a security filter, a high pressure pump, a reverse osmosis membrane shell, a reverse osmosis membrane, a large flow self-circulating pump, a water supply port, Concentrated water discharge port, support layer and second water pipe, the outlet end of the waste water inlet is connected to the water inlet end of the low-pressure pump through the first water pipe, and the water outlet end of the low-pressure pump is connected to the water inlet end of the security filter through the first water pipe , the water outlet of the security filter is connected to the water inlet of the high-pressure pump through the first water pipe, one side of the reverse osmosis membrane shell is the concentrated water side, the other side of the reverse osmosis membrane shell is the fresh water side, and the concentrated water side is The water pipes are connected end to end to form a closed pipeline. The middle part of the second water pipe is equipped with a large-flow self-circulation pump. The water inlet side of the large-flow self-circulation pump is provided with a water supply port. The water supply port is connected to the outlet of the high-pressure pump through the first water pipe. A concentrated water discharge port is provided on the water outlet side of the self-circulating pump, a reverse osmosis membrane is provided inside the membrane casing of the reverse osmosis membrane, and a support layer is sandwiched between the flow channels of the reverse osmosis membrane.
根据上述技术方案，所述低压泵、保安过滤器和高压泵的两端均设置有第一阀门。According to the above technical solution, first valves are provided at both ends of the low-pressure pump, the safety filter and the high-pressure pump.
根据上述技术方案，所述反渗透膜流道的宽度在2-6mm范围内调整。According to the above technical solution, the width of the flow channel of the reverse osmosis membrane is adjusted within the range of 2-6mm.
根据上述技术方案，所述支撑层呈网状，且支撑层的厚度在2-6mm范围内根据具体水质情况调整。According to the above technical solution, the support layer is in the shape of a net, and the thickness of the support layer is adjusted according to the specific water quality in the range of 2-6mm.
根据上述技术方案，所述大流量自循环泵为自动变频泵，大流量自循环泵两端均设置有第二阀门，补水口位于大流量自循环泵与第二阀门之间。According to the above technical solution, the high-flow self-circulation pump is an automatic variable-frequency pump, the two ends of the high-flow self-circulation pump are provided with second valves, and the water supply port is located between the large-flow self-circulation pump and the second valve.
根据上述技术方案，所述第二水管的内直径为第一水管内直径的2-5倍。According to the above technical solution, the inner diameter of the second water pipe is 2-5 times the inner diameter of the first water pipe.
根据上述技术方案，所述反渗透膜壳的淡水侧设置有回用淡水出口。According to the above technical solution, the fresh water side of the reverse osmosis membrane shell is provided with a recycled fresh water outlet.
本发明可以避免出现普通反渗透膜系统水流速度较低，极易在反渗透膜表面附着有机物或垢类的问题，同时可以兼顾了整个系统的压力平衡与物料平衡，能够使反渗透膜在极其恶劣水质条件下的运行得到优化，能够保障反渗透膜在高硬度、高浊度、高有机物浓度、高色度条件下的持续稳定运行，并同时能够将膜系统的人工清洗周期相对于普通运行工艺延长5倍以上，极大地增加膜系统寿命且降低运行维护人员劳动强度，尤其适用于极其恶劣水质条件下废水排放企事业单位的中水回用或零液排放项目，对提高水资源利用率具有极大的促进意义。The invention can avoid the problem that the water flow rate of the ordinary reverse osmosis membrane system is low, and it is very easy to attach organic substances or scales on the surface of the reverse osmosis membrane. The operation under harsh water quality conditions is optimized, which can ensure the continuous and stable operation of the reverse osmosis membrane under the conditions of high hardness, high turbidity, high organic matter concentration, and high chromaticity, and at the same time can reduce the manual cleaning cycle of the membrane system compared with the normal operation The process is extended by more than 5 times, which greatly increases the life of the membrane system and reduces the labor intensity of operation and maintenance personnel. It is especially suitable for reclaimed water reuse or zero liquid discharge projects of wastewater discharge enterprises and institutions under extremely bad water quality conditions, which is very important for improving the utilization rate of water resources. is of great promotional significance.
附图说明Description of drawings
附图用来提供对本发明的进一步理解，并且构成说明书的一部分，与本发明的实施例一起用于解释本发明，并不构成对本发明的限制。The accompanying drawings are used to provide a further understanding of the present invention, and constitute a part of the description, and are used together with the embodiments of the present invention to explain the present invention, and do not constitute a limitation to the present invention.
在附图中。In the attached picture.
图1是本发明运行流程结构示意图。Fig. 1 is a schematic diagram of the structure of the operation process of the present invention.
图2是本发明反渗透膜的流道断面结构示意图。Fig. 2 is a schematic diagram of the cross-sectional structure of the flow channel of the reverse osmosis membrane of the present invention.
图3是本发明支撑层的结构示意图。Fig. 3 is a schematic diagram of the structure of the support layer of the present invention.
图4是普通普通反渗透系统的运行工艺简要流程图。Fig. 4 is a brief flow chart of the operation process of an ordinary reverse osmosis system.
图5是普通反渗透膜的流道断面结构示意图。Fig. 5 is a schematic diagram of a cross-sectional structure of a flow channel of a common reverse osmosis membrane.
具体实施方式Detailed ways
下面结合附图1-5对本发明的具体实施方式做进一步详细说明。The specific implementation manner of the present invention will be described in further detail below in conjunction with accompanying drawings 1-5.
实施例一，由图1、图2和图3给出，本发明包括废水进口1、低压泵2、第一水管3、保安过滤器4、高压泵5、反渗透膜壳6、反渗透膜7、大流量自循环泵8、补水口9、浓水排放口10、支撑层11和第二水管12，废水进口1的出水端通过第一水管3与低压泵2的进水端连接，低压泵2的出水端通过第一水管3与保安过滤器4的进水端连接，保安过滤器4的出水端通过第一水管3与高压泵5的进水端连接，反渗透膜壳6的一侧为浓水侧，反渗透膜壳6的另一侧为淡水侧，浓水侧通过第二水管12首尾相连形成闭合管路，第二水管12的中部设置有大流量自循环泵8，大流量自循环泵8的进水侧设置有补水口9，补水口9通过第一水管3与高压泵5出水端连接，大流量自循环泵8的出水侧设置有浓水排放口10，反渗透膜的膜壳6的内部设置有反渗透膜7，反渗透膜7流道之间夹持有支撑层11，区别于普通反渗透膜运行模式，反渗透膜壳6的浓水侧通过第二水管12首尾相连，形成闭合管路，然后在闭合管路中单独设置大流量自循环泵8，使循环量是设计处理量的2-5倍，实际工程中根据实际优化效果使用自动变频泵自动调整，大幅提升膜表面流速，形成湍流，使得水中的有机物或者垢状物被高速水流冲刷带走，避免出现普通反渗透膜系统水流速度较低，极易在反渗透膜表面附着有机物或垢类的问题，管路虽然闭合，但管路中的循环水流压力高于渗透压，故水流会有一部分克服渗透压形成淡水回用，为了维持闭合管路的压力平衡与浓水侧及淡水侧的物料平衡，通过在闭合管路中大流量自循环泵8的进水侧的补水口9，由高压泵5泵入待处理液，泵入量即系统流经废水进口1、低压泵2、保安过滤器4和我高压泵5的设计处理量，同时，闭合管路中由于有机物被拦截，COD越来越高，需要排放一部分浓水，来维持压力平衡与物料平衡，故在闭合管路大流量自循环泵8的出口侧还要设置浓水排放口10，同时相较于普通反渗透膜，本发明使用的反渗透膜7构造较特殊，普通市售反渗透膜的流体流道只有0.2mm宽，并且流体流经膜表面为平流状态，而本发明使用的反渗透膜7经过流道的特殊改造，改造主要体现在两方面：一是流道可以在2-6mm范围内调整，是普通反渗透膜的10-30倍，所以不会有颗粒物堵塞、有机物粘附、垢类颗粒堵塞的风险；二是流道之间夹持了一层特殊结构的网状支撑层11，支撑层11的厚度在2-6mm范围内根据具体水质情况调整，使整体更稳定。Embodiment 1, given by Fig. 1, Fig. 2 and Fig. 3, the present invention includes waste water inlet 1, low-pressure pump 2, first water pipe 3, security filter 4, high-pressure pump 5, reverse osmosis membrane shell 6, reverse osmosis membrane 7. Large-flow self-circulating pump 8, water supply port 9, concentrated water discharge port 10, support layer 11 and second water pipe 12, the outlet end of waste water inlet 1 is connected to the water inlet end of low-pressure pump 2 through first water pipe 3, and the low-pressure The water outlet of the pump 2 is connected to the water inlet of the security filter 4 through the first water pipe 3, the water outlet of the security filter 4 is connected to the water inlet of the high-pressure pump 5 through the first water pipe 3, and one part of the reverse osmosis membrane shell 6 The concentrated water side is the concentrated water side, and the other side of the reverse osmosis membrane shell 6 is the fresh water side. The concentrated water side is connected end to end through the second water pipe 12 to form a closed pipeline. The water supply port 9 is provided on the water inlet side of the flow self-circulation pump 8, and the water supply port 9 is connected to the water outlet of the high-pressure pump 5 through the first water pipe 3. The reverse osmosis membrane 7 is installed inside the membrane shell 6 of the membrane, and the support layer 11 is sandwiched between the flow channels of the reverse osmosis membrane 7. Different from the normal reverse osmosis membrane operation mode, the concentrated water side of the reverse osmosis membrane shell 6 passes through the second The water pipes 12 are connected end to end to form a closed pipeline, and then a large-flow self-circulation pump 8 is installed separately in the closed pipeline, so that the circulation volume is 2-5 times the design processing volume. In actual engineering, the automatic frequency conversion pump is used according to the actual optimization effect. Adjustment to greatly increase the flow velocity on the surface of the membrane to form a turbulent flow, so that the organic matter or scale in the water is washed away by the high-speed water flow, avoiding the low flow rate of the ordinary reverse osmosis membrane system, which is very easy to attach organic matter or scale on the surface of the reverse osmosis membrane Although the pipeline is closed, the pressure of the circulating water flow in the pipeline is higher than the osmotic pressure, so part of the water flow will overcome the osmotic pressure and form fresh water for reuse. In order to maintain the pressure balance of the closed pipeline and the concentrated water side and the fresh water side For material balance, the liquid to be treated is pumped in by the high-pressure pump 5 through the water supply port 9 on the water inlet side of the self-circulating pump 8 with a large flow rate in the closed pipeline. The design capacity of the filter 4 and my high-pressure pump 5. At the same time, due to the interception of organic matter in the closed pipeline, the COD is getting higher and higher, and a part of the concentrated water needs to be discharged to maintain the pressure balance and material balance. Therefore, the closed pipeline is large Concentrated water discharge port 10 is also provided on the outlet side of flow self-circulating pump 8. Compared with ordinary reverse osmosis membrane, the structure of reverse osmosis membrane 7 used in the present invention is more special, and the fluid flow channel of ordinary commercially available reverse osmosis membrane is only 0.2 mm wide, and the fluid flows through the surface of the membrane in an advection state, and the reverse osmosis membrane 7 used in the present invention is through the special transformation of the flow channel, and the transformation is mainly reflected in two aspects: one is that the flow channel can be adjusted within the range of 2-6mm, is 10-30 times that of ordinary reverse osmosis membranes, so there will be no risk of particulate matter clogging, organic matter adhesion, and scale particle clogging; the second is that a layer of mesh support layer 11 with a special structure is sandwiched between the flow channels, and the support layer The thickness of 11 is adjusted according to the specific water quality in the range of 2-6mm, so that the whole is more stable.
实施例二，在实施例一的基础上，由图1给出，低压泵2、保安过滤器4和高压泵5的两端均设置有第一阀门13，方便控水。Embodiment 2, on the basis of Embodiment 1, shown in FIG. 1 , both ends of the low-pressure pump 2 , the security filter 4 and the high-pressure pump 5 are provided with a first valve 13 to facilitate water control.
实施例三，在实施例一的基础上，反渗透膜7流道的宽度在2-6mm范围内调整，防止颗粒物堵塞、有机物粘附、垢类颗粒堵塞。Embodiment 3, on the basis of Embodiment 1, the width of the flow channel of the reverse osmosis membrane 7 is adjusted within the range of 2-6 mm to prevent particle blockage, organic matter adhesion, and scale particle blockage.
实施例四，在实施例一的基础上，由图3给出，支撑层11呈网状，且支撑层11的厚度在2-6mm范围内根据具体水质情况调整，防止颗粒物堵塞、有机物粘附、垢类颗粒堵塞。Embodiment 4, on the basis of Embodiment 1, as shown in Figure 3, the support layer 11 is reticular, and the thickness of the support layer 11 is adjusted according to the specific water quality within the range of 2-6mm, so as to prevent particulate matter from clogging and organic matter from adhering , Scale particles clogged.
实施例五，在实施例一的基础上，由图1给出，大流量自循环泵8为自动变频泵，大流量自循环泵8两端均设置有第二阀门14，补水口9位于大流量自循环泵8与第二阀门14之间，根据实际优化效果使用自动变频泵自动调整，通过第二阀门14，便于闭合回路的控水。Embodiment five, on the basis of embodiment one, given by Figure 1, the large flow self-circulation pump 8 is an automatic frequency conversion pump, the two ends of the large flow self-circulation pump 8 are provided with second valves 14, and the water supply port 9 is located at the large The flow is between the circulating pump 8 and the second valve 14, and is automatically adjusted by the automatic frequency conversion pump according to the actual optimization effect, and passes through the second valve 14, which is convenient for water control of the closed loop.
实施例六，在实施例一的基础上，第二水管12的内直径为第一水管3内直径的2-5倍大幅提升膜表面流速，形成湍流，使得水中的有机物或者垢状物被高速水流冲刷带走，避免出现普通反渗透膜系统水流速度较低，极易在反渗透膜表面附着有机物或垢类的问题。Embodiment 6, on the basis of Embodiment 1, the inner diameter of the second water pipe 12 is 2-5 times of the inner diameter of the first water pipe 3, greatly increasing the surface flow velocity of the membrane, forming turbulent flow, so that the organic matter or scale in the water is swept away at a high speed. The water flow is washed away, avoiding the problem that the water flow rate of the ordinary reverse osmosis membrane system is low, and it is easy to attach organic matter or scale to the surface of the reverse osmosis membrane.
实施例七，在实施例一的基础上，由图1给出，反渗透膜壳6的淡水侧设置有回用淡水出口15，方便回用淡水。Embodiment 7. On the basis of Embodiment 1, as shown in FIG. 1 , the fresh water side of the reverse osmosis membrane shell 6 is provided with a reused fresh water outlet 15 to facilitate the reuse of fresh water.
本发明区别于普通反渗透膜运行模式，反渗透膜壳6的浓水侧通过第二水管12首尾相连，形成闭合管路，然后在闭合管路中单独设置大流量自循环泵8，使循环量是设计处理量的2-5倍，实际工程中根据实际优化效果使用自动变频泵自动调整，大幅提升膜表面流速，形成湍流，使得水中的有机物或者垢状物被高速水流冲刷带走，避免出现普通反渗透膜系统水流速度较低，极易在反渗透膜表面附着有机物或垢类的问题，管路虽然闭合，但管路中的循环水流压力高于渗透压，故水流会有一部分克服渗透压形成淡水回用，为了维持闭合管路的压力平衡与浓水侧及淡水侧的物料平衡，通过在闭合管路中大流量自循环泵8的进水侧的补水口9，由高压泵5泵入待处理液，泵入量即系统流经废水进口1、低压泵2、保安过滤器4和我高压泵5的设计处理量，同时，闭合管路中由于有机物被拦截，COD越来越高，需要排放一部分浓水，来维持压力平衡与物料平衡，故在闭合管路大流量自循环泵8的出口侧还要设置浓水排放口10，同时相较于普通反渗透膜，本发明使用的反渗透膜7构造较特殊，普通市售反渗透膜的流体流道只有0.2mm宽，并且流体流经膜表面为平流状态，而本发明使用的反渗透膜7经过流道的特殊改造，改造主要体现在两方面：一是流道可以在2-6mm范围内调整，是普通反渗透膜的10-30倍，所以不会有颗粒物堵塞、有机物粘附、垢类颗粒堵塞的风险；二是流道之间夹持了一层特殊结构的网状支撑层11，支撑层11的厚度在2-6mm范围内根据具体水质情况调整，使整体更稳定。The present invention is different from the ordinary reverse osmosis membrane operation mode. The concentrated water side of the reverse osmosis membrane shell 6 is connected end to end through the second water pipe 12 to form a closed pipeline, and then a large flow self-circulation pump 8 is separately installed in the closed pipeline to make the circulation The capacity is 2-5 times of the design capacity. In the actual project, the automatic frequency conversion pump is used to automatically adjust according to the actual optimization effect, which greatly increases the flow velocity on the membrane surface and forms a turbulent flow, so that the organic matter or scale in the water is washed away by the high-speed water flow to avoid The water flow rate of the ordinary reverse osmosis membrane system is low, and it is very easy to attach organic matter or scale on the surface of the reverse osmosis membrane. Although the pipeline is closed, the pressure of the circulating water flow in the pipeline is higher than the osmotic pressure, so the water flow will be partially overcome Osmotic pressure forms fresh water reuse. In order to maintain the pressure balance of the closed pipeline and the material balance of the concentrated water side and the fresh water side, the high-flow pump 8 is supplied by the high-pressure pump 5. Pump in the liquid to be treated. The pumped amount is the designed processing capacity of the system flowing through the waste water inlet 1, the low-pressure pump 2, the security filter 4 and the high-pressure pump 5. At the same time, due to the interception of organic matter in the closed pipeline, the COD is getting more and more The higher the concentration, the more concentrated water needs to be discharged to maintain pressure balance and material balance. Therefore, a concentrated water discharge port 10 should be provided on the outlet side of the closed pipeline large-flow self-circulation pump 8. At the same time, compared with ordinary reverse osmosis membranes, this The structure of the reverse osmosis membrane 7 used in the invention is rather special. The fluid channel of the common commercially available reverse osmosis membrane is only 0.2 mm wide, and the fluid flows through the surface of the membrane in an advection state, while the reverse osmosis membrane 7 used in the present invention passes through the special flow channel. Transformation, transformation is mainly reflected in two aspects: First, the flow channel can be adjusted within the range of 2-6mm, which is 10-30 times that of ordinary reverse osmosis membranes, so there will be no risk of particulate matter clogging, organic matter adhesion, and scale particle clogging The second is that a layer of special structure mesh support layer 11 is sandwiched between the runners, and the thickness of the support layer 11 is adjusted according to the specific water quality within the range of 2-6mm, so that the whole is more stable.
本发明可以避免出现普通反渗透膜系统水流速度较低，极易在反渗透膜7表面附着有机物或垢类的问题，同时可以兼顾了整个系统的压力平衡与物料平衡，能够使反渗透膜在极其恶劣水质条件下的运行得到优化，能够保障反渗透膜在高硬度、高浊度、高有机物浓度、高色度条件下的持续稳定运行，并同时能够将膜系统的人工清洗周期相对于普通运行工艺延长5倍以上，极大地增加膜系统寿命且降低运行维护人员劳动强度，尤其适用于极其恶劣水质条件下废水排放企事业单位的中水回用或零液排放项目，对提高水资源利用率具有极大的促进意义。The present invention can avoid the problem that the water flow rate of the ordinary reverse osmosis membrane system is low, and it is very easy to attach organic matter or scale on the surface of the reverse osmosis membrane 7. At the same time, it can take into account the pressure balance and material balance of the whole system, and can make the reverse osmosis membrane The operation under extremely bad water quality conditions is optimized, which can ensure the continuous and stable operation of the reverse osmosis membrane under the conditions of high hardness, high turbidity, high organic matter concentration, and high chromaticity, and at the same time can reduce the manual cleaning cycle of the membrane system compared with ordinary The operating process is extended by more than 5 times, which greatly increases the life of the membrane system and reduces the labor intensity of operation and maintenance personnel. It is especially suitable for reclaimed water reuse or zero liquid discharge projects of wastewater discharge enterprises and institutions under extremely bad water quality conditions, which is beneficial to improving the utilization of water resources. rate is of great significance.
最后应说明的是：以上所述仅为本发明的优选实施例而已，并不用于限制本发明，尽管参照前述实施例对本发明进行了详细的说明，对于本领域的技术人员来说，其依然可以对前述各实施例所记载的技术方案进行修改，或者对其中部分技术特征进行等同替换。凡在本发明的精神和原则之内，所作的任何修改、等同替换、改进等，均应包含在本发明的保护范围之内。Finally, it should be noted that: the above is only a preferred embodiment of the present invention, and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, it still The technical solutions recorded in the foregoing embodiments may be modified, or some technical features thereof may be equivalently replaced. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.
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