DTRO landfill leachate treatment system

Abstract

The utility model discloses a DTRO (Disk Tubular Reverse Osmosis) landfill leachate treatment system, which belongs to the field of environmental protection equipment and comprises a regulating reservoir system, a raw water tank, a two-stage DTRO treatment system, a degassing tower and a clean water pump which are connected in sequence, the system is characterized in that the adjusting tank system comprises an adjusting tank and a lifting pump which are sequentially connected, and a sulfuric acid injection port and a concentrated water backflow inlet are formed in the two ends of the raw water tank respectively; the produced water output end of secondary DTRO equipment in the two-stage DTRO treatment system is connected with the upper end of a degassing tower through a pipeline, and the side end of the degassing tower is connected with the input end of a clean water pump through a pipeline; the concentrated water output end of the first-stage DTRO equipment in the two-stage DTRO treatment system is connected with the upper end of the concentrated water tank through a pipeline, and the side end of the concentrated water tank is connected with the recharge pump through a pipeline. According to the utility model, the generation of mixed water with high hardness and alkalinity can be reduced, and the generation of scale is reduced, so that the condition of membrane blockage is relieved, the membrane cleaning frequency is reduced, the membrane cleaning time is shortened, and meanwhile, the production time is shortened.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of environmental protection equipment, especially to a DTRO landfill leachate treatment system. BACKGROUND

[0002] Landfill leachate mainly comes from the infiltration of precipitation, snow, frost and hail, which is the main source of leachate; in addition, the infiltration of groundwater, the inflow of surface water and the moisture contained in the garbage itself can also cause landfill leachate. Landfill leachate contains high concentrations of COD, BOD5, heavy metals and organic matter. As the landfill time increases, the types and concentrations of pollutants change greatly. If effective treatment is not taken, it will cause serious environmental pollution, and even pollute groundwater.

[0003] Currently, the main landfill leachate treatment process is biochemical method + membrane method, or two-stage DTRO process. Considering the poor quality of landfill leachate in the later stage of landfill, high hardness and alkalinity, and poor biodegradability, the use of biochemical method + membrane method has certain limitations, so the biochemical method + membrane method is not considered as a technical solution. However, when using two-stage DTRO process, the high hardness and alkalinity water is mixed together, and this mixed water body will generate scale, which will easily block the membrane during daily work, thus reducing the service life of the membrane and increasing the cleaning frequency of the membrane. The time for cleaning the membrane also occupies the production time, resulting in prolonged production time. To overcome the above-mentioned shortcomings, the inventor has invented a DTRO landfill leachate treatment system. SUMMARY

[0004] In view of the deficiencies in the prior art, the purpose of the utility model is to provide a DTRO landfill leachate treatment system, which can reduce the generation of high hardness and alkalinity mixed water body, reduce the generation of scale, thus alleviating the membrane blockage, reducing the membrane cleaning frequency, reducing the cleaning time of the membrane, and shortening the production time.

[0005] To achieve the above-mentioned purpose, the utility model is realized by the following technical solutions:

[0006] A DTRO landfill leachate treatment system, comprising a regulating tank system, a raw water tank, a two-stage DTRO treatment system, a degassing tower and a clean water pump connected in sequence; the regulating tank system comprises a regulating tank and a booster pump connected in sequence, and the two ends of the raw water tank are respectively provided with a sulfuric acid injection inlet and a concentrated water backflow inlet; the water output end of the secondary DTRO equipment in the two-stage DTRO treatment system is connected to the upper end of the degassing tower through a pipeline, and the side end of the degassing tower is connected to the input end of the clean water pump through a pipeline; the concentrated water output end of the primary DTRO equipment in the two-stage DTRO treatment system is connected to the upper end of the concentrated water tank through a pipeline, and the side end of the concentrated water tank is connected to the recharge pump through a pipeline.

[0007] As a further implementation, the two-stage DTRO treatment system comprises, in sequence, a raw water pump, a multi-medium filter, a security filter, a first high-pressure pump, a first-stage DTRO device, a second high-pressure pump, and a second-stage DTRO device.

[0008] The concentrated water output end of the second-stage DTRO device is connected to the concentrated water return inlet through a pipeline.

[0009] As a further implementation, the recharge liquid output by the recharge pump finally flows to a landfill.

[0010] As a further implementation, the regulating tank and the input end of the lifting pump are connected through a pipeline, and the output end of the lifting pump is connected to the raw water tank through a pipeline.

[0011] As a further implementation, the output end of the clean water pump is used to discharge qualified leachate.

[0012] As a further implementation, the multi-medium filter and the security filter are connected through a pipeline, and a descaling agent inlet is arranged on the pipeline between the multi-medium filter and the security filter.

[0013] As a further implementation, according to production needs, the degassing tower can be replaced by a degassing clean water tank.

[0014] The beneficial effects of the present application are as follows:

[0015] The sulfuric acid injection inlet of the present application is used to inject sulfuric acid to adjust the PH, and by reducing the PH of the liquid, the hardness and alkalinity of the water are also reduced, which can reduce the generation of scale, the recharge liquid output by the recharge pump finally flows to a landfill, and thus the leachate that does not meet the standard in the first-stage DTRO device finally flows to the landfill, that is, the leachate that does not meet the standard is prevented from flowing to the second-stage DTRO device, the membrane of the second-stage DTRO device is prevented from being blocked, the descaling agent is regularly added through the descaling agent inlet, which can reduce the generation of scale in the pipeline, effectively avoiding the phenomenon of scale blocking the membrane, and thus the frequency of membrane cleaning is reduced, the time of cleaning the membrane is saved, and the production time is saved. BRIEF DESCRIPTION OF DRAWINGS

[0016] The drawings accompanying the specification of the present application form a part thereof, serve to provide further understanding of the present application, and together with the description of the exemplary embodiments of the present application and the explanation thereof serve to explain the present application, and do not constitute an improper limitation of the present application.

[0017] Figure 1 is a schematic diagram of the connection of the present application.

[0018] Marked in the drawing: 1, conditioning tank, 2, booster pump, 3, raw water tank, 4, sulfuric acid injection port, 5, raw water pump, 6, multi-medium filter, 7, scale inhibitor inlet, 8, security filter, 9, first high-pressure pump, 10, first-stage DTRO device, 11, concentrated water tank, 12, recharge pump, 13, second high-pressure pump, 14, second-stage DTRO device, 15, concentrated water return inlet, 16, degassing tower, 17, clean water pump. DETAILED DESCRIPTION

[0019] EMBODIMENT

[0020] The embodiment provides a DTRO landfill leachate treatment system, as shown in the figure, which comprises a conditioning tank system, a raw water tank 3, a two-stage DTRO treatment system, a degassing tower 16 and a clean water pump 17 connected in sequence. The conditioning tank system comprises a conditioning tank 1 and a booster pump 2 connected in sequence. The conditioning tank 1 is used for adjusting water quality and quantity. The booster pump 2 provides driving force for liquid flow in a pipeline. The input ends of the conditioning tank 1 and the booster pump 2 are connected through a pipeline. The output end of the booster pump 2 is connected with the raw water tank 3 through a pipeline. The raw water tank 3 is provided with a sulfuric acid injection port 4 and a concentrated water return inlet 15 at two ends respectively. The sulfuric acid injection port 4 is used for injecting sulfuric acid to adjust the PH of liquid. By reducing the PH of liquid, the hardness and alkalinity of water are also reduced, so that the generation of water scale can be reduced. The concentrated water output end of the second-stage DTRO device 14 is connected with the concentrated water return inlet 15 through a pipeline. The concentrated water return inlet 15 is used for receiving concentrated water (here, it refers to leachate that does not meet the standard) concentrated by the second-stage DTRO device 14, and then sending the concentrated water to the raw water tank 3.

[0021] The water production output end of the second-stage DTRO device 14 in the two-stage DTRO treatment system is connected with the upper end of the degassing tower 16 through a pipeline. The degassing tower 16 is used for promoting the separation of gas in the leachate. The side end of the degassing tower 16 is connected with the input end of the clean water pump 17 through a pipeline. The clean water pump 17 provides driving force to make the leachate separated from gas flow as soon as possible. The output end of the clean water pump 17 is used for discharging qualified leachate.

[0022] The concentrated water output end of the first-stage DTRO device 10 in the two-stage DTRO treatment system is connected with the upper end of the concentrated water tank 11 through a pipeline. The side end of the concentrated water tank 11 is connected with the recharge pump 12 through a pipeline. The recharge liquid (here, it refers to leachate that does not meet the standard) output by the recharge pump 12 finally flows to the landfill site. Therefore, the leachate that does not meet the standard in the first-stage DTRO device 10 finally flows to the landfill site, that is, the leachate that does not meet the standard is prevented from flowing to the second-stage DTRO device 14, and the membrane of the second-stage DTRO device 14 is prevented from being blocked.

[0023] The two-stage DTRO treatment system comprises, in sequence, a raw water pump 5, a multi-medium filter 6, a security filter 8, a first high-pressure pump 9, a first-stage DTRO device 10, a second high-pressure pump 13, and a second-stage DTRO device 14; the raw water pump 5 and the multi-medium filter 6 are connected by a pipeline, the multi-medium filter 6 and the security filter 8 are connected by a pipeline, and a descaling agent inlet 7 is arranged on the pipeline between the multi-medium filter 6 and the security filter 8; thus, the descaling agent is regularly added through the descaling agent inlet 7 to reduce the hardness of the water body and reduce the generation of water scale in the pipeline, effectively avoiding the phenomenon that the water scale blocks the membrane in the flow.

[0024] The security filter 8 provides the last barrier to filter the water scale in the liquid and prevent the water scale from continuously flowing to block the membrane.

[0025] The first high-pressure pump 9 is connected to the water inlet input end of the first-stage DTRO device 10 by a pipeline, the water outlet output end of the first-stage DTRO device 10 is connected to the input end of the second high-pressure pump 13 by a pipeline, and the output end of the second high-pressure pump 13 is connected to the water inlet input end of the second-stage DTRO device 14 by a pipeline.

[0026] According to production needs, the degassing tower 16 can be replaced by a degassing clean water tank.

[0027] The use process of the DTRO landfill leachate treatment system is as follows: after the water quality and quantity are adjusted by the adjusting tank 1, the lifting pump 2 is started to pump the adjusted liquid into the raw water tank 3, sulfuric acid is added into the raw water tank 3 through the sulfuric acid injection inlet 4 to adjust the PH, the raw water pump 5 is started to pump the liquid in the raw water tank 3 to the multi-medium filter 6, then the liquid is transported to the security filter 8 through a pipeline, the liquid is filtered by the security filter 8, the liquid is pressurized by the first high-pressure pump 9 and then flows to the first-stage DTRO device 10, the second high-pressure pump 13 provides driving force, the leachate flows to the second-stage DTRO device 14, the liquid is filtered again, then the liquid passes through the degassing tower 16, is pumped out by the clean water pump 17, and the leachate meeting the standard is obtained.

[0028] The lengths, thicknesses and heights of the lines of the adjusting tank 1, the raw water tank 3, the sulfuric acid injection inlet 4 and the scale inhibitor inlet 7 in the drawings are only for illustration, and a person skilled in the art can make adaptive adjustment according to actual use.

[0029] The lengths, thicknesses, sizes and heights of the lines of the first-stage DTRO device 10, the second-stage DTRO device 14, the degassing tower 16 and the concentrated water backflow inlet 15 in the drawings are only for illustration, and a person skilled in the art can make adaptive adjustment according to actual use.

[0030] The positions and quantities of the first high-pressure pump 9 and the second high-pressure pump 13 in the drawings are only for illustration, and a person skilled in the art can make adaptive adjustment according to actual use.

[0031] The above descriptions are only the preferred embodiments of the present application, and are not intended to limit the present application. The present application can have various changes and modifications for those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A DTRO landfill leachate treatment system, comprising a conditioning tank system, a raw water tank, a two-stage DTRO treatment system, a degassing tower and a clean water pump connected in sequence; the conditioning tank system comprises a conditioning tank and a booster pump connected in sequence, and the raw water tank is provided with a sulfuric acid injection inlet and a concentrated water backflow inlet at two ends respectively; the water production output end of the secondary DTRO equipment in the two-stage DTRO treatment system is connected with the upper end of the degassing tower through a pipeline, and the side end of the degassing tower is connected with the input end of the clean water pump through a pipeline; the concentrated water output end of the primary DTRO equipment in the two-stage DTRO treatment system is connected with the upper end of a concentrated water tank through a pipeline, and the side end of the concentrated water tank is connected with a recharge pump through a pipeline. characterized in that The two-stage DTRO treatment system comprises a raw water pump, a multi-medium filter, a safety filter, a first high-pressure pump, a primary DTRO equipment, a second high-pressure pump and a secondary DTRO equipment connected in sequence; the concentrated water output end of the secondary DTRO equipment is connected with the concentrated water backflow inlet through a pipeline. The recharge liquid output by the recharge pump finally flows to a landfill site. The conditioning tank is connected with the input end of the booster pump through a pipeline, and the output end of the booster pump is connected with the raw water tank through a pipeline.

2. The DTRO landfill leachate treatment system of claim 1, wherein, The output end of the clean water pump is used for discharging qualified leachate. The multi-medium filter and the safety filter are connected through a pipeline, and a descaling agent inlet is arranged on the pipeline between the multi-medium filter and the safety filter.

3. The DTRO landfill leachate treatment system of claim 1, wherein, According to production needs, the degassing tower can be replaced by a degassing clean water tank.

4. The DTRO landfill leachate treatment system of claim 1, wherein, ​ 5. The DTRO landfill leachate treatment system of claim 1, wherein, ​ 6. The DTRO landfill leachate treatment system of claim 2, wherein, ​ 7. The DTRO landfill leachate treatment system of claim 1, wherein, ​

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