CN215440070U - Zero-discharge treatment system for landfill leachate - Google Patents
Zero-discharge treatment system for landfill leachate Download PDFInfo
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Abstract
The utility model discloses a zero-emission treatment system for landfill leachate, which efficiently connects the advantages of anaerobic, TUF softening, DTNF, deamination membrane, AOP/BAC and DTRO processes in series, realizes targeted staged treatment aiming at the characteristic of high concentration and difficult treatment of the landfill leachate, has good water quality of final process effluent, and meets the water supplement standard of an open circulating cooling water system in the water quality for urban sewage recycling industry (GB/T19923-.
Description
Technical Field
The utility model relates to the technical field of landfill leachate treatment, in particular to a zero-discharge treatment system for landfill leachate.
Background
Leachate generated in a waste incineration power plant is discharged in the waste compression and curing processes, has the characteristics of complex organic matter components, high concentrations of suspended matters and heavy metals and the like, and is very difficult to treat. At present, the main flow treatment process of the landfill leachate of the incineration power plant is 'pretreatment + anaerobism + two-stage A/O + ultrafiltration + nanofiltration + reverse osmosis', but the process has high requirements on A/O operation, a membrane is easy to pollute, block and scale in the operation process, and meanwhile, the amount of generated membrane concentrate is large and difficult to treat, so that great challenges are brought to the stable operation of the whole process.
The utility model provides a new process of filtering, anaerobic treatment, TUF softening, DTNF, deamination membrane, AOP/BAC and DTRO, on one hand, pollutants such as organic matters, ammonia nitrogen, total nitrogen and the like in leachate can be removed in a targeted and efficient manner to meet the standard of recycled water of a power plant, on the other hand, the pollutants are removed step by step and recycled through the division of unit processes, meanwhile, the stable operation of a garbage leachate treatment system is ensured, and the purpose of zero-emission leachate is finally achieved through the treatment of the process.
SUMMERY OF THE UTILITY MODEL
In order to solve the defects of the prior art, the utility model aims to provide a treatment system capable of realizing zero discharge of garbage leachate, which carries out anaerobic treatment after filtering the garbage leachate to remove most organic pollutants, then reducing the hardness in the garbage percolate through TUF softening to avoid dirt blockage and scaling of subsequent equipment, further separating through a DTNF membrane, concentrating organic pollutants in the garbage percolate into concentrated solution and spraying back to an incinerator, feeding clear liquid into a deamination membrane device, ammonia nitrogen in clear liquid is effectively removed through the high-efficiency deamination of a deamination membrane, and after the wastewater after deamination is further treated by advanced oxidation and biological activated carbon combined process, at the moment, indexes such as COD, ammonia nitrogen and total nitrogen of the wastewater are further reduced, and finally, the wastewater is separated by a DTRO membrane, the obtained produced water meets the standard of reuse water, the concentrated solution is subjected to low-temperature evaporation and then salt separation, and the condensate is reused. The whole process flow realizes the zero emission treatment of the landfill leachate.
The specific technical scheme is as follows:
the utility model provides a landfill leachate zero release processing system, softens system, DTNF system, deamination membrane system, AOP BAC system and DTRO system including filtration system, anaerobic system, TUF who connects gradually, wherein:
the filtering system is provided with a filter device and a backwashing device;
the anaerobic system is provided with an anaerobic tank device, a first dosing device, a steam heating device, a biological desulfurization device and a methane incineration device; the water outlet of the filter device is connected with the water inlet of the anaerobic tank device, the connecting pipeline is provided with a steam heating device, the gas outlet of the anaerobic tank device is provided with a biological desulfurization device, and the gas outlet of the biological desulfurization device is connected with a methane burning device;
the TUF softening system is provided with a TUF membrane device, a second dosing device, a third dosing device, a fourth dosing device and a muddy water collecting device; the water outlet of the anaerobic tank device is connected with the water inlet of the TUF membrane device, a second dosing device, a third dosing device and a fourth dosing device are arranged on a connecting pipeline, and a muddy water collecting device is arranged at the bottom outlet of the TUF membrane device;
the DTNF system is provided with a DTNF membrane device, a fifth medicine adding device, a sixth medicine adding device and a concentrated solution collecting device; the water inlet of the DTNF membrane device is connected with the water outlet of the TUF membrane device, the connecting pipeline is provided with a fifth medicine adding device and a sixth medicine adding device, and the bottom outlet of the DTNF membrane device is provided with a concentrated solution collecting device;
the deamination membrane system is provided with a deamination membrane device, a seventh dosing device, an eighth dosing device and an ammonium sulfate collecting device; the water inlet of the deamination membrane device is connected with the water outlet of the DTNF membrane device, a seventh dosing device is arranged on the connecting pipeline, the ammonium sulfate outlet of the deamination membrane device is connected with an ammonium sulfate collecting device, and an eighth dosing device is arranged on the connecting pipeline;
the AOP/BAC system is configured with ClO2Generator and ClO2An oxidation device, a biological activated carbon device and a ninth dosing device; ClO2The water inlet of the oxidation device is connected with the water outlet of the deamination membrane device, and a ninth dosing device is arranged on the connecting pipeline; ClO2The water outlet of the oxidation device is connected with the water inlet of the biological activated carbon device;
the DTRO system is provided with a DTRO membrane device, a low-temperature evaporation device, a tenth dosing device and an eleventh dosing device
A drug device; the water inlet of the DTRO membrane device is connected with the water outlet of the biological activated carbon device, the connecting pipeline is provided with a tenth dosing device and an eleventh dosing device, and the DTRO concentrated solution outlet of the DTRO membrane device is connected with the low-temperature evaporation device.
Based on the system, the zero-emission treatment method of the landfill leachate comprises the following steps:
step 1: the landfill leachate enters a filter, and fine suspended matters and insoluble impurities in the landfill leachate are removed through the micro-pore filtration of the filter;
step 2: the garbage percolate passing through the filter enters an anaerobic reactor, and partial organic pollutants in the percolate are removed through anaerobic biochemical action (namely organic matters are degraded by facultative bacteria and obligate anaerobic bacteria under the anaerobic condition, and the final products are carbon dioxide and methane gas); the biogas generated by anaerobic biochemical action is subjected to biological desulfurization (the gas generated is mainly methane gas) and then is subjected to incineration treatment;
and step 3: the effluent of the anaerobic reactor enters a TUF softening system to reduce the hardness of landfill leachate and remove part of colloid pollutants (the aperture of the TUF membrane is micron grade, and the particle size of most colloid particles is also in the range, so that the removal effect can be realized); sludge generated by the TUF softening system is further treated by outward transportation after being subjected to filter pressing and dehydration, and water generated by filter pressing and dehydration returns to the anaerobic state;
and 4, step 4: the TUF effluent treated by the TUF softening system enters a DTNF system, and is subjected to DTNF membrane separation treatment, so that the landfill leachate is subjected to advanced treatment (the membrane process mainly intercepts substances in the wastewater according to different molecular weights by the filtering action of a membrane, and the principle is the same as that of filter paper); wherein, the generated DTNF concentrated solution is sprayed back to an incinerator (the process of the utility model aims at an incineration power plant, the process of the utility model contains the incinerator), and clear liquid enters the next working procedure;
and 5: clear liquid obtained after being treated by the DTNF system enters a deamination membrane system, ammonia nitrogen in the garbage percolate is efficiently removed under the action of the deamination membrane, and an ammonium sulfate product is obtained at the same time and is used as a smoke denitration raw material for digestion treatment;
step 6: the deamination membrane effluent obtained by the deamination membrane system enters an AOP/BAC system, advanced oxidation and biochemical combined technology is used for carrying out advanced treatment on the deamination membrane effluent, and organic pollutants, ammonia nitrogen and the like in the deamination membrane effluent are further removed;
and 7: biochemical effluent obtained by the AOP/BAC system enters a DTRO system, and is subjected to advanced treatment (the pore diameter of an ultrafiltration membrane, a nanofiltration membrane and a reverse osmosis membrane is smaller and smaller, so that the water quality obtained by filtration is better and better) by a DTRO membrane to separate to obtain produced water and a DTRO concentrated solution, wherein the produced water is recycled, and the DTRO concentrated solution is subjected to full-quantitative treatment by a low-temperature evaporation process to obtain crystallized salt and the condensate is recycled.
Preferably: in the step 1, the pore diameter of the filter is 5-500 μm.
Preferably: in the step 3, the TUF softening system comprises a TUF membrane, the molecular weight cut-off is 5000-.
Preferably: in the step 4, the DTNF system comprises a DTNF membrane, the molecular weight cut-off is 150-300 daltons, and the operating pressure is 1.0-3.5 MPa.
Preferably: in the step 5, the deamination membrane system comprises a hollow fiber microporous hydrophobic membrane, and the ammonia concentration of the deamination membrane is 100-30000 mg/L.
Preferably: in the step 6, the AOP/BAC system comprises an advanced oxidation and biological activated carbon process, wherein the advanced oxidation oxidant is ClO2。
Preferably: in the step 7, the DTRO system comprises a DTRO membrane, the molecular weight cut-off is less than 100, and the operating pressure is 3.0-6.0 MPa.
Preferably: in the step 7, the temperature of the low-temperature heat source in the low-temperature evaporation process is 50-85 ℃.
Preferably: the softening pH value of the step 3 is 10-12, the pH value of TUF effluent in the step 4 is adjusted to 6.2-6.8, the pH value of DTNF clear liquid in the step 5 is adjusted to 10-11, the pH value of deamination membrane effluent in the step 6 is adjusted to 7.5-8.0, and the pH value of AOP/BAC system effluent in the step 7 is adjusted to 6.2-6.8.
Compared with the prior art, the utility model has the following beneficial effects:
(1) the anaerobic process, the TUF softening process, the DTNF process, the deamination membrane process, the AOP/BAC process and the DTRO process are connected in series with high efficiency, targeted staged treatment is realized aiming at the characteristic of high concentration and difficult treatment of the landfill leachate, and the final process has good effluent quality and meets the water supplement standard of an open circulating cooling water system in the water quality of municipal sewage recycling industrial water (GB/T19923-.
(2) Anaerobic biogas realizes high-efficiency processing through biological desulfurization, TUF softens the sludge and handles outward, and deamination membrane product ammonium sulfate is used for flue gas denitration, and the concentrate that produces in the course of the treatment is used for burning furnace back spray on the one hand, and low temperature evaporates out salt on the one hand, has realized complete absorption, and whole technology has satisfied the zero release requirement.
(3) The TUF softening reduces the water hardness of the landfill leachate, and ensures the long-term stable operation of the subsequent membrane treatment process.
(4) The process flow is simple and efficient, the integration is high, the operation is easy, the occupied area is small, and the popularization prospect is good.
Drawings
Fig. 1 is a schematic process flow diagram of zero-discharge treatment of landfill leachate disclosed by the utility model.
Fig. 2 is a schematic structural diagram of the system for zero discharge of landfill leachate disclosed by the utility model.
In the figure: 1-a filtration system; 11-a filter device; 12-backwashing means; 2-an anaerobic system; 21-steam heating means; 22-a first dosing device; 23-anaerobic tank means; 24-a biological desulfurization unit; 25-a biogas incineration device; 3-TUF softeningA system; 31-a second dosing device; 32-a third dosing device; 33-a fourth dosing device; 34-a TUF membrane device; 35-a mud water collecting device; 4-DTNF system; 41-fifth medicine device; 42-a sixth dosing device; a 43-DTNF membrane unit; 44-a concentrated solution collecting device; 5-a deamination membrane system; 51-a seventh dosing device; 52-a deamination membrane device; 53-eighth dosing device; 54-an ammonium sulfate collection device; 6-AOP/BAC system; 61-ninth dosing device; 62-ClO2A generating device; 63-ClO2An oxidation unit; 64-a biological activated carbon device; a 7-DTRO system; 71-tenth dosing device; 72-eleventh medicated device; 73-DTRO membrane unit; 74-Low temperature vaporizer.
Detailed Description
The embodiment discloses a zero-emission treatment method for landfill leachate, which comprises the following steps:
step 1: filtering, wherein the landfill leachate flows through a filter, and fine suspended matters and insoluble impurities in the landfill leachate are removed through the microporous filtering effect of the filter;
step 2: and (3) anaerobic treatment, wherein the effluent obtained in the step (1) enters an anaerobic reactor, and most of organic pollutants in the leachate are removed through anaerobic biochemical action. The biogas generated by anaerobic treatment is further incinerated by biological desulfurization, and the desulfurization product is sulfur;
and step 3: and (3) TUF softening, wherein the effluent obtained in the step (2) enters a TUF softening system, and the hardness and part of colloid pollutants in the landfill leachate are removed by adding alkali liquor and coagulant. Sludge produced by the water produced by the TUF softening system is further subjected to filter pressing and dehydration and then is transported to the outside for disposal;
and 4, step 4: and (3) DTNF, enabling the effluent in the step (3) to enter a DTNF system, and performing DTNF membrane separation treatment to obtain advanced treatment on the landfill leachate. Wherein, the generated DTNF concentrated solution is sprayed back to the incinerator, and the clear liquid enters the next working procedure;
and 5: deamination membrane, namely, enabling the clear liquid in the step 4 to enter a deamination membrane system, and efficiently removing ammonia nitrogen in the garbage percolate under the action of the deamination membrane to obtain an ammonium sulfate product which is used as a smoke denitration raw material for digestion treatment;
step 6: AOP/BAC, the effluent of step 5 enters an AOP/BAC system, advanced oxidation and biochemical combined processes are used for carrying out advanced treatment on the deamination membrane effluent, and organic pollutants, ammonia nitrogen and the like in the deamination membrane effluent are further removed;
and 7: and D, DTRO, the biochemical effluent in the step 6 enters a DTRO system, and is subjected to advanced treatment through a DTRO membrane to be separated to obtain product water and DTRO concentrated solution, wherein the product water is recycled, the DTRO concentrated solution is subjected to full-quantitative treatment through a low-temperature evaporation process to obtain crystallized salt, and the condensate is recycled.
Wherein, in the step 1, the pore diameter of the filter is 5-500 μm.
Wherein, in the step 3, the TUF softening system comprises a TUF membrane, the molecular weight cut-off is 5000-.
Wherein, in the step 4, the DTNF system comprises a DTNF membrane with the molecular weight cutoff of 150-.
Wherein, in the step 5, the deamination membrane system comprises a hollow fiber microporous hydrophobic membrane, and the ammonia concentration of the deamination membrane is 100-30000 mg/L.
Wherein, in step 6, the AOP/BAC system comprises an advanced oxidation and biological activated carbon process, wherein the advanced oxidation oxidant is ClO2。
Wherein, in the step 7, the DTRO system comprises a DTRO membrane, the cut-off molecular weight is less than 100, and the operating pressure is 3.0-6.0 MPa.
Wherein, in the step 7, the temperature of the low-temperature heat source in the low-temperature evaporation process is 50-85 ℃.
Wherein the softening pH value in the step 3 is 10-12, the pH value of TUF effluent in the step 4 is adjusted to 6.2-6.8, the pH value of DTNF clear liquid in the step 5 is adjusted to 10-11, the pH value of deamination membrane effluent in the step 6 is adjusted to 7.5-8.0, and the pH value of AOP/BAC system effluent in the step 7 is adjusted to 6.2-6.8.
Example 1
The zero-emission treatment method of the landfill leachate with COD of 47700mg/L, ammonia nitrogen of 926mg/L, total nitrogen of 1442mg/L, total hardness of 2450mg/L and SS of 20450mg/L comprises the following steps:
step 1: filtering, wherein the landfill leachate flows through a filter, and fine suspended matters and insoluble impurities in the landfill leachate are removed through the micro-filtration of the filter. After treatment, COD is 45697mg/L, ammonia nitrogen is 913mg/L, total nitrogen is 1358mg/L, total hardness is 2418mg/L, and SS is 15929 mg/L.
Step 2: and (3) anaerobic treatment, wherein the effluent obtained in the step (1) enters an anaerobic reactor, and most of organic pollutants in the leachate are removed through anaerobic biochemical action. The biogas generated by anaerobic treatment is further incinerated by biological desulfurization, and the desulfurization product is sulfur. After treatment, the COD is 5219mg/L, the ammonia nitrogen is 820mg/L, the total nitrogen is 1225mg/L, the total hardness is 2388mg/L, and the SS is 13110 mg/L.
And step 3: and (3) TUF softening, wherein the effluent obtained in the step (2) enters a TUF softening system, and the hardness and part of colloid pollutants in the landfill leachate are removed by adding alkali liquor and coagulant. Sludge produced by the water produced by the TUF softening system is further subjected to pressure filtration dehydration and then is transported to outside for disposal. After treatment, COD is 4286mg/L, ammonia nitrogen is 759mg/L, total nitrogen is 1160mg/L, total hardness is 31mg/L, and SS is 318 mg/L.
And 4, step 4: and (3) DTNF, enabling the effluent in the step (3) to enter a DTNF system, and performing DTNF membrane separation treatment to obtain advanced treatment on the landfill leachate. Wherein the generated DTNF concentrated solution is sprayed back to the incinerator, and the clear solution enters the next working procedure. After treatment, COD is 214mg/L, ammonia nitrogen is 493mg/L, total nitrogen is 820mg/L, total hardness is 1.6mg/L, and SS is 25 mg/L.
And 5: deamination membrane, step 4 clear solution get into deamination membrane device, and through the effect of deamination membrane, the ammonia nitrogen in landfill leachate obtains high-efficient getting rid of, obtains the ammonium sulfate product simultaneously, and it is handled as flue gas denitration raw materials consumption. After treatment, COD is 214mg/L, ammonia nitrogen is 5mg/L, total nitrogen is 330mg/L, total hardness is 1.6mg/L, and SS is 25 mg/L.
Step 6: and (5) AOP/BAC, wherein the effluent obtained in the step (5) enters an AOP/BAC system, advanced oxidation and biochemical combined processes are used for carrying out advanced treatment on the deamination membrane effluent, and organic pollutants, ammonia nitrogen and the like in the deamination membrane effluent are further removed. After treatment, COD is 110mg/L, ammonia nitrogen is 0.4mg/L, total nitrogen is 112mg/L, total hardness is 0.4mg/L, and SS is 5 mg/L.
And 7: and D, DTRO, the biochemical effluent in the step 6 enters a DTRO system, and is subjected to advanced treatment through a DTRO membrane to be separated to obtain product water and DTRO concentrated solution, wherein the product water is recycled, the DTRO concentrated solution is subjected to full-quantitative treatment through a low-temperature evaporation process to obtain crystallized salt, and the condensate is recycled. After treatment, COD is 8mg/L, ammonia nitrogen is 0mg/L, total nitrogen is 30mg/L, total hardness is 0mg/L, and SS is 0 mg/L. The water quality of the final process effluent is good, and the water supplement standard of an open circulating cooling water system in the water quality of industrial water for urban sewage recycling (GB/T19923-.
Although the embodiments of the present invention have been described above with reference to the accompanying drawings, the present invention is not limited to the above-described embodiments and application fields, and the above-described embodiments are illustrative, instructive, and not restrictive. Those skilled in the art, having the benefit of this disclosure, may effect numerous modifications thereto without departing from the scope of the utility model as defined by the appended claims.
Claims (3)
1. The utility model provides a landfill leachate zero release processing system, its characterized in that softens system, DTNF system, deamination membrane system, AOP BAC system and DTRO system including filtration system, anaerobism system, TUF, wherein:
the filtering system (1) is provided with a filter device (11) and a backwashing device (12);
the anaerobic system (2) is provided with an anaerobic tank device (23), a first dosing device (22), a steam heating device (21), a biological desulphurization device (24) and a methane incineration device (25); a water inlet of the anaerobic tank device (23) is connected with a water outlet of the filter device (11), and a steam heating device (21) is arranged on the connecting pipeline;
the TUF softening system (3) is provided with a TUF membrane device (34), a second dosing device (31), a third dosing device (32), a fourth dosing device (33) and a muddy water collecting device (35); a water outlet of the anaerobic tank device (23) is connected with a water inlet of the TUF membrane device (34), a second dosing device (31), a third dosing device (32) and a fourth dosing device (33) are arranged on a connecting pipeline, and a muddy water collecting device (35) is arranged at an outlet at the bottom of the TUF membrane device (34);
the DTNF system (4) is provided with a DTNF membrane device (43), a fifth medicine adding device (41), a sixth medicine adding device (42) and a concentrated solution collecting device (44); a water inlet of the DTNF membrane device (43) is connected with a water outlet of the TUF membrane device (34), a fifth medicine adding device (41) and a sixth medicine adding device (42) are arranged on a connecting pipeline, and a concentrated solution collecting device (44) is arranged at an outlet at the bottom of the DTNF membrane device (43);
the deamination membrane system (5) is provided with a deamination membrane device (52), a seventh dosing device (51), an eighth dosing device (53) and an ammonium sulfate collecting device (54); a water inlet of the deamination membrane device (52) is connected with a water outlet of the DTNF membrane device (43), a seventh dosing device (51) is arranged on a connecting pipeline, an ammonium sulfate outlet of the deamination membrane device (52) is connected with an ammonium sulfate collecting device (54), and an eighth dosing device (53) is arranged on the connecting pipeline;
the AOP/BAC system (6) is configured with ClO2Generating device (62), ClO2An oxidation device (63), a biological activated carbon device (64) and a ninth dosing device (61); ClO2A water inlet of the oxidation device (63) is connected with a water outlet of the deamination membrane device (52), and a ninth dosing device (61) is arranged on the connecting pipeline; ClO2The water outlet of the oxidation device (63) is connected with the water inlet of the biological activated carbon device (64);
the DTRO system (7) is provided with a DTRO membrane device (73), a low-temperature evaporation device (74), a tenth dosing device (71) and an eleventh dosing device (72); the water inlet of the DTRO membrane device (73) is connected with the water outlet of the biological activated carbon device (64), the connecting pipeline is provided with a tenth dosing device (71) and an eleventh dosing device (72), and the DTRO concentrated solution outlet of the DTRO membrane device (73) is connected with the low-temperature evaporation device (74).
2. The zero discharge treatment system for landfill leachate according to claim 1, wherein the pore size of the filter device (11) is 5-500 μm.
3. The landfill leachate zero emission treatment system of claim 1, wherein the anaerobic tank device (23) is provided with a biological desulfurization device (24) at the gas outlet, and the gas outlet of the biological desulfurization device (24) is connected with a biogas incineration device (25).
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