WO2016074144A1 - Treatment system for highly concentrated saline wastewater - Google Patents
Treatment system for highly concentrated saline wastewater Download PDFInfo
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- WO2016074144A1 WO2016074144A1 PCT/CN2014/090777 CN2014090777W WO2016074144A1 WO 2016074144 A1 WO2016074144 A1 WO 2016074144A1 CN 2014090777 W CN2014090777 W CN 2014090777W WO 2016074144 A1 WO2016074144 A1 WO 2016074144A1
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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
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
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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
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/30—Aerobic and anaerobic processes
Definitions
- the invention relates to a treatment system, in particular to a high concentration salty wastewater treatment system.
- salty wastewater is as follows: 1. Under the condition of salinity less than 2g/L, salty sewage may be treated by domestication. However, the acclimated salinity concentration must be gradually increased, and the system is domesticated to the required salinity level in stages. Suddenly high salt environment will cause delays in domestication and start-up; 2. Dilute the influent salinity. Since high salt becomes a microbial inhibitor and toxic agent, the influent water is diluted to make the salinity lower than the toxic domain value. Processing will not receive suppression. This method is simple, easy to operate and manage; its disadvantages are increased processing scale, increased capital investment, increased operating costs, and wasted water resources; 3. When salinity is greater than 2g/L, evaporation and concentration demineralization is the most economical and effective. A viable approach. Other methods, such as the cultivation of salt-containing bacteria, have problems in industrial practice that are difficult to operate.
- the technical problem to be solved by the present invention is to provide a high-concentration salty wastewater treatment system with advanced technology, reliable operation, simple operation management and low cost.
- a high-concentration salty wastewater treatment system which is innovative: mainly includes a regulating tank, an evaporator, an anaerobic reactor, a contact oxidation tank, a secondary sedimentation tank, and a sewage. Mud pool
- the evaporator has a total of three, which are an effect evaporator, a two-effect evaporator and a three-effect evaporator, and the adjustment tank, the first-effect evaporator, the second-effect evaporator, the three-effect evaporator, and the anaerobic reactor , contact oxidation pond, secondary sedimentation tank and sludge tank are arranged in sequence;
- a preheater is further disposed between the regulating tank and the first effect evaporator, a sludge return line is disposed between the contact oxidation tank and the anaerobic reactor, and a sludge return pump is disposed on the sludge return line to contact
- a sludge conveying pipeline is arranged between the oxidation tank and the sludge tank, and a sludge conveying pump is arranged on the sludge conveying pipeline, and a conditioning tank is further arranged at the discharge port of the sludge tank, and the discharging port of the conditioning tank is The plate and frame filter presses are connected.
- the invention has the advantages that: the three-effect evaporation is adopted, and the pre-effect secondary steam is introduced as the after-effect heating medium, that is, the after-effect heating chamber becomes the condenser of the pre-effect secondary steam, and only the first effect needs to consume the raw steam.
- High efficiency and energy saving greatly reduce engineering operation costs, and at the same time make the salt in the wastewater crystallize and reuse as much as possible, while reducing sludge production, and considering the final disposal of sludge.
- FIG. 1 is a schematic view of a high concentration salty wastewater treatment system of the present invention.
- the high-concentration salty wastewater treatment system of the present invention mainly comprises a regulating tank 1, an evaporator, an anaerobic reactor 6, a contact oxidation tank 8, a secondary settling tank 9, and a sludge tank 10.
- a preheater 2 is further disposed between the conditioning tank 1 and the one-effect evaporator 3, and a sludge return line 7 is disposed between the contact oxidation tank 8 and the anaerobic reactor 6, and is disposed on the sludge return line 7.
- a sludge return pump There is a sludge return pump, a sludge transfer line 12 is disposed between the contact oxidation tank 8 and the sludge tank 10, and a sludge transfer pump is disposed on the sludge transfer line 12 at the discharge port of the sludge tank 10.
- a conditioning tank 11 is further disposed, and the discharge port of the conditioning tank 11 is connected to the plate and frame filter press 13.
- the high-concentration salty wastewater is sent to the regulating tank 1, and the water quality and the amount of the wastewater are adjusted by the regulating tank 1, and then pumped into the preheater 2 through the feed pump.
- the pre-heat treated wastewater enters the vapor-liquid two-phase inlet interface in the first effect evaporator 3, and the wastewater is uniformly distributed in the first effect evaporator 3 through the first heating chamber on the inner wall of the heating tube.
- a special vapor-liquid two-phase boiling zone is provided at the upper end of the heater, and the static pressure of the vapor-liquid mixture in the boiling zone increases the boiling point of the lower liquid and causes the solution to spirally flow in the heating pipe. It is only heated and does not produce vaporization.
- the boiling wastewater enters the first effect separation chamber to complete the vapor and liquid separation, and reaches the designed concentration and is sent to the crystallizer.
- the wastewater entering the second effect evaporator 4 is circulated in the second effect evaporator 4 by using the same principle in the first effect and the evaporation concentration is completed. After the wastewater reaches the design concentration in the second effect, it is sent to the crystallization. Device.
- the wastewater entering the third effect evaporator 5 is subjected to evaporation and concentration by the same principle, and a forced circulation pump is arranged in each effect evaporator 3 to make the spiral flow rate of the material in the heater tube reach 2.0. m/s or more.
- the crystal body and the saturated mother liquid are separated by a hydrocyclone to enter the crystallizer, cooled and cooled, and then recrystallized, and the mother liquid continues to evaporate in the evaporator.
- the concentrated liquid in the crystallizer is separated into a centrifugal separator, and the separated solid crystal salt is bagged, and the separated mother liquid is transferred to the adjustment tank 1 and the original waste water into the evaporation system to continue evaporation and crystallization, and the whole process forms a continuous circulation system. .
- the wastewater after three-effect evaporation enters the anaerobic reactor 6, and there is an anaerobic sludge bed at the bottom of the reaction zone of the anaerobic reactor 6, the sludge concentration is 50-100 g/l, and the wastewater is anaerobic.
- the bottom of the device 6 enters the reaction zone, and the upward flow of water and the large amount of gas generated rise to form a good natural agitation, and a part of the sludge forms a relatively thin sludge suspension zone above the reaction zone, and the sludge concentration in the suspension zone is 5 In the range of -40 g/l, the suspension enters the settling chamber of the separation zone, where the sludge settles, returns to the reaction zone by the inclined surface, and the clarified treated water overflows.
- the wastewater enters the contact oxidation tank 8 after passing through the anaerobic reactor 6, and a certain amount of filler is filled in the contact oxidation tank 8, and the biofilm and the fully supplied oxygen are used to biooxidize.
- the organic matter in the wastewater is oxidized and decomposed to achieve the purpose of purification.
- the purified wastewater enters the secondary settling tank 9, and the wastewater is separated from the sludge in the secondary settling tank 9 and the sludge is concentrated.
- the excess sludge in the anaerobic reactor 6 and the sludge in the secondary settling tank 9 are all entered into the sludge tank 10.
- the plate and frame are pressed.
- the filter 13 is pressure-filtered and the mud cake produced by the pressure filtration is transported.
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Abstract
The present invention relates to a treatment system for highly concentrated saline wastewater, the system mainly comprising a regulating tank, evaporators, an anaerobic reactor, a contact oxidation tank, a secondary sedimentation tank and a sludge tank. A total of three evaporators are provided, respectively a single-effect evaporator, a double-effect evaporator and a triple-effect evaporator. The regulating tank, the single-effect evaporator, the double-effect evaporator, the triple-effect evaporator, the anaerobic reactor, the contact oxidation tank, the secondary sedimentation tank and the sludge tank are arranged sequentially. A preheater is also arranged between the regulating tank and the single-effect evaporator, a sludge return pipe is arranged between the contact oxidation tank and the anaerobic reactor, a sludge transfer pipe is arranged between the contact oxidation tank and the sludge tank, a conditioning tank is also arranged at a discharge port of the sludge tank, and a discharge port of the conditioning tank is connected to a plate and frame filter press. The advantages of the present invention are: triple-effect evaporation is used, the system is highly efficient and energy-saving, salt in wastewater is crystallised and reused as much as possible, sludge output is reduced, and final disposal of the sludge is taken into account.
Description
技术领域Technical field
本发明涉及一种处理系统，具体的说是一种高浓度含盐废水处理系统。The invention relates to a treatment system, in particular to a high concentration salty wastewater treatment system.
背景技术Background technique
目前，对于含盐废水处理如下：1、在盐度小于2g/L条件下，可能通过驯化处理含盐污水。但是驯化盐度浓度必须逐渐提高，分阶段的将系统驯化到要求盐度水平。突然高盐环境会造成驯化的失败和启动的延迟；2、稀释进水盐度，既然高盐成为微生物的抑制和毒害剂，那么将进水进行稀释，使盐度低于毒域值，生物处理就不会收到抑制。这种方法简单，易于操作和管理；其缺点就是增加处理规模，增加基建投资，增加运行费用，浪费水资源；3、在盐度大于2g/L时，蒸发浓缩除盐是最经济也是最有效的可行办法。其它的方法如培养含盐菌等的方法都存在工业实践难以运行的问题。At present, the treatment of salty wastewater is as follows: 1. Under the condition of salinity less than 2g/L, salty sewage may be treated by domestication. However, the acclimated salinity concentration must be gradually increased, and the system is domesticated to the required salinity level in stages. Suddenly high salt environment will cause delays in domestication and start-up; 2. Dilute the influent salinity. Since high salt becomes a microbial inhibitor and toxic agent, the influent water is diluted to make the salinity lower than the toxic domain value. Processing will not receive suppression. This method is simple, easy to operate and manage; its disadvantages are increased processing scale, increased capital investment, increased operating costs, and wasted water resources; 3. When salinity is greater than 2g/L, evaporation and concentration demineralization is the most economical and effective. A viable approach. Other methods, such as the cultivation of salt-containing bacteria, have problems in industrial practice that are difficult to operate.
发明内容Summary of the invention
本发明要解决的技术问题是提供一种技术先进、运行可靠、操作管理简单、成本低的高浓度含盐废水处理系统。The technical problem to be solved by the present invention is to provide a high-concentration salty wastewater treatment system with advanced technology, reliable operation, simple operation management and low cost.
为了解决上述技术问题，本发明的技术方案为：一种高浓度含盐废水处理系统，其创新点在于：主要包括调节池、蒸发器、厌氧反应器、接触氧化池、二沉池及污泥池；In order to solve the above technical problem, the technical solution of the present invention is: a high-concentration salty wastewater treatment system, which is innovative: mainly includes a regulating tank, an evaporator, an anaerobic reactor, a contact oxidation tank, a secondary sedimentation tank, and a sewage. Mud pool
所述蒸发器一共有三个，分别为一效蒸发器、二效蒸发器及三效蒸发器，所述调节池、一效蒸发器、二效蒸发器、三效蒸发器、厌氧反应器、接触氧化池、二沉池及污泥池依次设置；The evaporator has a total of three, which are an effect evaporator, a two-effect evaporator and a three-effect evaporator, and the adjustment tank, the first-effect evaporator, the second-effect evaporator, the three-effect evaporator, and the anaerobic reactor , contact oxidation pond, secondary sedimentation tank and sludge tank are arranged in sequence;
所述调节池与一效蒸发器之间还设置有预热器，接触氧化池与厌氧反应器之间设置有污泥回流管路，在污泥回流管路上设置有污泥回流泵，接触氧化池与污泥池之间设置有污泥输送管路，在污泥输送管路上设置有污泥输送泵，在污泥池的出料口处还设置有调理池，调理池的出料口与板框压滤机相连接。A preheater is further disposed between the regulating tank and the first effect evaporator, a sludge return line is disposed between the contact oxidation tank and the anaerobic reactor, and a sludge return pump is disposed on the sludge return line to contact A sludge conveying pipeline is arranged between the oxidation tank and the sludge tank, and a sludge conveying pump is arranged on the sludge conveying pipeline, and a conditioning tank is further arranged at the discharge port of the sludge tank, and the discharging port of the conditioning tank is The plate and frame filter presses are connected.
本发明的优点在于：采用三效蒸发，引入前效的二次蒸汽作为后效的加热介质，即后效的加热室成为前效二次蒸汽的冷凝器，仅第一效需要消耗生蒸汽，高效节能，极大地降低工程运行费，同时使得废水中的盐尽可能多的结晶再利用，同时减少污泥产量，并考虑污泥的最终处置。The invention has the advantages that: the three-effect evaporation is adopted, and the pre-effect secondary steam is introduced as the after-effect heating medium, that is, the after-effect heating chamber becomes the condenser of the pre-effect secondary steam, and only the first effect needs to consume the raw steam. High efficiency and energy saving, greatly reduce engineering operation costs, and at the same time make the salt in the wastewater crystallize and reuse as much as possible, while reducing sludge production, and considering the final disposal of sludge.
附图说明DRAWINGS
图1为本发明的高浓度含盐废水处理系统的示意图。1 is a schematic view of a high concentration salty wastewater treatment system of the present invention.
具体实施方式detailed description
如图1所示的示意图可知，本发明的高浓度含盐废水处理系统主要包括调节池1、蒸发器、厌氧反应器6、接触氧化池8、二沉池9及污泥池10。As shown in the schematic diagram of FIG. 1, the high-concentration salty wastewater treatment system of the present invention mainly comprises a regulating tank 1, an evaporator, an anaerobic reactor 6, a contact oxidation tank 8, a secondary settling tank 9, and a sludge tank 10.
蒸发器一共有三个，分别为一效蒸发器3、二效蒸发器4及三效蒸发器5，调节池1、一效蒸发器3、二效蒸发器4、三效蒸发器5、厌氧反应器6、接触氧化池8、二沉池9及污泥池10依次设置。There are three evaporators, one-effect evaporator 3, two-effect evaporator 4 and three-effect evaporator 5, regulating tank 1, one-effect evaporator 3, two-effect evaporator 4, three-effect evaporator 5, and disgusting The oxygen reactor 6, the contact oxidation tank 8, the secondary settling tank 9, and the sludge tank 10 are sequentially disposed.
在调节池1与一效蒸发器3之间还设置有预热器2，接触氧化池8与厌氧反应器6之间设置有污泥回流管路7，在污泥回流管路7上设置有污泥回流泵，接触氧化池8与污泥池10之间设置有污泥输送管路12，在污泥输送管路12上设置有污泥输送泵，在污泥池10的出料口处还设置有调理池11，调理池11的出料口与板框压滤机13相连接。A preheater 2 is further disposed between the conditioning tank 1 and the one-effect evaporator 3, and a sludge return line 7 is disposed between the contact oxidation tank 8 and the anaerobic reactor 6, and is disposed on the sludge return line 7. There is a sludge return pump, a sludge transfer line 12 is disposed between the contact oxidation tank 8 and the sludge tank 10, and a sludge transfer pump is disposed on the sludge transfer line 12 at the discharge port of the sludge tank 10. A conditioning tank 11 is further disposed, and the discharge port of the conditioning tank 11 is connected to the plate and frame filter press 13.
本发明的高浓度含盐废水处理系统在对废水进行处理的步骤具体如下：The steps of treating the wastewater in the high-concentration saline wastewater treatment system of the present invention are as follows:
第一步，首先，将高浓度含盐废水送至调节池1中，利用调节池1对废水的水质以及水量进行调节，然后通过进料泵泵送进入预热器2。In the first step, first, the high-concentration salty wastewater is sent to the regulating tank 1, and the water quality and the amount of the wastewater are adjusted by the regulating tank 1, and then pumped into the preheater 2 through the feed pump.
第二步，预热处理后的废水进入第一效蒸发器3内的汽液二相入口交界面处，废水在第一效蒸发器3中经第一加热室均匀地在加热管内壁从下向上螺旋流动，在加热器上端设有专门的汽液两相共存的沸腾区，废水在沸腾区内汽液混合物的静压使下层液体的沸点升高，并使溶液在加热管中螺旋流动时只受热而不产生汽化，沸腾废水进入第一效分离室完成汽、液分离，达到设计浓度后送入结晶器。In the second step, the pre-heat treated wastewater enters the vapor-liquid two-phase inlet interface in the first effect evaporator 3, and the wastewater is uniformly distributed in the first effect evaporator 3 through the first heating chamber on the inner wall of the heating tube. Spiral flow upward, a special vapor-liquid two-phase boiling zone is provided at the upper end of the heater, and the static pressure of the vapor-liquid mixture in the boiling zone increases the boiling point of the lower liquid and causes the solution to spirally flow in the heating pipe. It is only heated and does not produce vaporization. The boiling wastewater enters the first effect separation chamber to complete the vapor and liquid separation, and reaches the designed concentration and is sent to the crystallizer.
第三步，进入第二效蒸发器4内的废水运用第一效内相同的原理在第二效蒸发器4内循环并完成蒸发浓缩，废水在第二效内达到设计浓度后，送入结晶器。In the third step, the wastewater entering the second effect evaporator 4 is circulated in the second effect evaporator 4 by using the same principle in the first effect and the evaporation concentration is completed. After the wastewater reaches the design concentration in the second effect, it is sent to the crystallization. Device.
第四步，进入第三效蒸发器5的废水，以同样的原理进行蒸发浓缩，在每一效蒸发器3内均设置有强制循环泵，使物料在加热器列管中的螺旋流速达到2.0m/s以上。In the fourth step, the wastewater entering the third effect evaporator 5 is subjected to evaporation and concentration by the same principle, and a forced circulation pump is arranged in each effect evaporator 3 to make the spiral flow rate of the material in the heater tube reach 2.0. m/s or more.
第五步，在废水中产生晶粒度达100－120目的颗粒结晶产品后，结晶体和饱和母液经旋液分离器分离晶体进入结晶器冷却降温后再结晶，母液继续回到蒸发器中蒸发，结晶器中的浓缩液至离心分离机分离，分离出的固体结晶盐装袋，完成分离后的母液至调节池1与原废水一起进入蒸发系统，继续蒸发与结晶，整个过程形成一个连续循环系统。In the fifth step, after the granular crystal product having a grain size of 100-120 mesh is produced in the waste water, the crystal body and the saturated mother liquid are separated by a hydrocyclone to enter the crystallizer, cooled and cooled, and then recrystallized, and the mother liquid continues to evaporate in the evaporator. The concentrated liquid in the crystallizer is separated into a centrifugal separator, and the separated solid crystal salt is bagged, and the separated mother liquid is transferred to the adjustment tank 1 and the original waste water into the evaporation system to continue evaporation and crystallization, and the whole process forms a continuous circulation system. .
第六步，经过三效蒸发后的废水进入厌氧反应器6，在厌氧反应器6反应区的底部有厌氧污泥床，污泥浓度在50-100g/l，废水由厌氧反应器6底部进入反应区，水的向上流动和产生的大量气体上升形成良好的自然搅拌作用，并使一部分污泥在反应区的上方形成相对稀薄的污泥悬浮区，悬浮区污泥浓度在5-40g/l范围内，悬浮液进入分离区的沉降室，污泥在此沉降，由斜面返回反应区，澄清后的处理水溢流排出。In the sixth step, the wastewater after three-effect evaporation enters the anaerobic reactor 6, and there is an anaerobic sludge bed at the bottom of the reaction zone of the anaerobic reactor 6, the sludge concentration is 50-100 g/l, and the wastewater is anaerobic. The bottom of the device 6 enters the reaction zone, and the upward flow of water and the large amount of gas generated rise to form a good natural agitation, and a part of the sludge forms a relatively thin sludge suspension zone above the reaction zone, and the sludge concentration in the suspension zone is 5 In the range of -40 g/l, the suspension enters the settling chamber of the separation zone, where the sludge settles, returns to the reaction zone by the inclined surface, and the clarified treated water overflows.
第七步，废水经过厌氧反应器6后进入接触氧化池8，在接触氧化池8内装填一定数量的填料，利用栖附在填料上的生物膜和充分供应的氧气，通过生物氧化作用，将废水中的有机物氧化分解，达到净化目的。In the seventh step, the wastewater enters the contact oxidation tank 8 after passing through the anaerobic reactor 6, and a certain amount of filler is filled in the contact oxidation tank 8, and the biofilm and the fully supplied oxygen are used to biooxidize. The organic matter in the wastewater is oxidized and decomposed to achieve the purpose of purification.
第八步，净化后的废水进入二沉池9，在二沉池9内对废水进行泥水分离外以及污泥浓缩。In the eighth step, the purified wastewater enters the secondary settling tank 9, and the wastewater is separated from the sludge in the secondary settling tank 9 and the sludge is concentrated.
第九步，厌氧反应器6内的剩余污泥以及二沉池9内的污泥均进入污泥池10中，污泥池10中的污泥通过调理池11调理后，采用板框压滤机13压滤，压滤生成的泥饼外运处理。In the ninth step, the excess sludge in the anaerobic reactor 6 and the sludge in the secondary settling tank 9 are all entered into the sludge tank 10. After the sludge in the sludge tank 10 is conditioned by the conditioning tank 11, the plate and frame are pressed. The filter 13 is pressure-filtered and the mud cake produced by the pressure filtration is transported.
以上显示和描述了本发明的基本原理和主要特征和本发明的优点。本行业的技术人员应该了解，本发明不受上述实施例的限制，上述实施例和说明书中描述的只是说明本发明的原理，在不脱离本发明精神和范围的前提下，本发明还会有各种变化和改进，这些变化和改进都落入要求保护的本发明范围内。本发明要求保护范围由所附的权利要求书及其等效物界定。
The basic principles and main features of the present invention and the advantages of the present invention are shown and described above. It should be understood by those skilled in the art that the present invention is not limited by the foregoing embodiments, and that the present invention is only described in the foregoing description and the description of the present invention, without departing from the spirit and scope of the invention. Various changes and modifications are intended to be included within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and their equivalents.
Claims (1)
- 一种高浓度含盐废水处理系统，其特征在于：主要包括调节池、蒸发器、厌氧反应器、接触氧化池、二沉池及污泥池；The invention relates to a high-concentration salty wastewater treatment system, which is characterized in that it mainly comprises a regulating tank, an evaporator, an anaerobic reactor, a contact oxidation tank, a secondary sedimentation tank and a sludge tank;所述蒸发器一共有三个，分别为一效蒸发器、二效蒸发器及三效蒸发器，所述调节池、一效蒸发器、二效蒸发器、三效蒸发器、厌氧反应器、接触氧化池、二沉池及污泥池依次设置；The evaporator has a total of three, which are an effect evaporator, a two-effect evaporator and a three-effect evaporator, and the adjustment tank, the first-effect evaporator, the second-effect evaporator, the three-effect evaporator, and the anaerobic reactor , contact oxidation pond, secondary sedimentation tank and sludge tank are arranged in sequence;所述调节池与一效蒸发器之间还设置有预热器，接触氧化池与厌氧反应器之间设置有污泥回流管路，在污泥回流管路上设置有污泥回流泵，接触氧化池与污泥池之间设置有污泥输送管路，在污泥输送管路上设置有污泥输送泵，在污泥池的出料口处还设置有调理池，调理池的出料口与板框压滤机相连接。A preheater is further disposed between the regulating tank and the first effect evaporator, a sludge return line is disposed between the contact oxidation tank and the anaerobic reactor, and a sludge return pump is disposed on the sludge return line to contact A sludge conveying pipeline is arranged between the oxidation tank and the sludge tank, and a sludge conveying pump is arranged on the sludge conveying pipeline, and a conditioning tank is further arranged at the discharge port of the sludge tank, and the discharging port of the conditioning tank is The plate and frame filter presses are connected.
Priority Applications (1)
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| PCT/CN2014/090777 WO2016074144A1 (en) | 2014-11-11 | 2014-11-11 | Treatment system for highly concentrated saline wastewater |
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| PCT/CN2014/090777 WO2016074144A1 (en) | 2014-11-11 | 2014-11-11 | Treatment system for highly concentrated saline wastewater |
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| CN107381951A (en) * | 2017-08-16 | 2017-11-24 | 安徽德玉环境工程装备有限公司 | A kind of buried integrated sewage treating apparatus |
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| WO2018032831A1 (en) * | 2016-08-16 | 2018-02-22 | 中电建水环境治理技术有限公司 | Residual soil regeneration processing system for contaminated bottom mud in rivers and lakes |
| CN108911438A (en) * | 2018-09-20 | 2018-11-30 | 华蓥市职业教育培训中心 | A kind of sewage disposal system |
| CN108947117A (en) * | 2018-07-12 | 2018-12-07 | 永嘉县城东市政建设有限公司 | A kind of sewage purifying and treating device of municipal sewage pipe network |
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