CN218811161U - Full-quantization treatment device for percolate of household garbage landfill - Google Patents

Abstract

The utility model discloses a domestic waste landfill leachate full-quantization processing apparatus, including the MVR evaporimeter the feed liquor of MVR evaporimeter is served and is connected with preprocessing device, the steam output of MVR evaporimeter is connected with the steam inlet end of washing the tower with alkaline, the steam outlet end of washing the tower with alkaline is connected with the steam inlet end of compressor, the steam outlet end of compressor is connected with the steam inlet end of MVR evaporimeter, the dense liquid exit end of MVR evaporimeter is connected with the feed liquor end of MVR low temperature forced circulation evaporimeter, the distilled water play water end of MVR low temperature forced circulation evaporimeter is connected with second grade RO processing apparatus's the end of intaking, the dense liquid exit end of MVR low temperature forced circulation evaporimeter is connected with the feed liquor end of concentrate solidification equipment. The utility model discloses can effectively get rid of the suspended solid in the landfill leachate, can effectively reduce evaporimeter scale deposit speed and reduce the full quantization processing apparatus of domestic waste landfill leachate of the ammonia nitrogen of evaporation product aquatic.

Description

Full-quantization treatment device for percolate of household garbage landfill

Technical Field

The utility model relates to a sewage treatment plant technical field, concretely relates to full quantization processing apparatus of domestic waste landfill filtration liquid.

Background

The landfill leachate is sewage generated by the garbage under the influence of external factors through complex physical, chemical and biochemical actions in the sanitary landfill process. Landfill leachate is classified into two categories according to its landfill age: one is early percolate, the landfill time is less than 5 years, and the water quality of the produced percolate is characterized by lower pH value, higher COD and BOD5 concentration, higher BOD5/COD ratio and higher concentration of various heavy metals; the other is old percolate, the landfill time is more than 5 years, and the main water quality characteristics of the generated percolate are that the pH value is close to neutral, the COD and the BOD5 concentration are lower, the BOD5/COD ratio is lower, the ammonia nitrogen concentration is higher, and the heavy metal concentration begins to decrease.

At present, most landfill sites adopt a combined process of pretreatment (coagulating sedimentation, ammonia nitrogen stripping, chemical oxidation, hydrolytic acidification and the like), biological treatment (anaerobic treatment, anoxic treatment, aerobic treatment and the like), physicochemical advanced treatment (adsorption, membrane separation, advanced oxidation and the like), and effluent is directly discharged or brought into a sewage pipe network. The pretreatment method mainly comprises a physical method, a chemical method, a biological method and the like, and the process mainly aims to remove ammonia nitrogen or inorganic impurities or improve the biodegradability of the percolate.

Chinese patent with patent application No. CN201510092161.2 discloses a treatment process for landfill leachate, which adopts coagulation air flotation or precipitation and ammonia nitrogen stripping as pretreatment, and the ammonia nitrogen removal effect of the pretreatment process is good, so that inorganic impurities can be effectively removed, but the process has the problems of large floor area, incapability of effectively inhibiting toxic substances and the like.

Chinese patent No. CN201310720198.6 discloses a method for treating early stage landfill leachate, which comprises a biological treatment process comprising an anaerobic reactor and an integrated denitrification reactor, wherein the integrated iron-carbon fenton reactor is a chemical oxidation treatment process, a coagulation precipitation process, a filtration treatment process, and the like, the treatment process uses an anaerobic reactor as a pretreatment process, and degrades most organic matters in the early stage landfill leachate into micromolecular organic matters by using the degradation effect of anaerobic microorganisms.

In addition, at present, the prior art generally uses a leachate pretreatment device to carry out pretreatment operation on leachate, and the prior leachate pretreatment device cannot conveniently carry out secondary filtration on the leachate when in use, and needs to open the device in advance or midway to add the leachate and concentrated sulfuric acid for treatment, so that the operation is complex, the continuous treatment cannot be realized, and the limitation is realized.

SUMMERY OF THE UTILITY MODEL

The utility model aims at overcoming the weak point among the prior art, provide a can effectively get rid of the suspended solid in the landfill leachate, can effectively reduce evaporimeter scale deposit speed and reduce the full quantization processing apparatus of domestic waste landfill leachate of the ammonia nitrogen in the evaporation product water.

In order to achieve the purpose, the utility model adopts the following scheme: the utility model provides a full quantization processing apparatus of domestic waste landfill leachate which characterized in that: the device comprises an MVR evaporator, wherein a pretreatment device is connected to the liquid inlet end of the MVR evaporator, the steam output end of the MVR evaporator is connected with the steam inlet end of an alkaline washing tower, the steam outlet end of the alkaline washing tower is connected with the steam inlet end of a compressor, the steam outlet end of the compressor is connected with the steam inlet end of the MVR evaporator, the concentrated liquid outlet end of the MVR evaporator is connected with the liquid inlet end of the MVR low-temperature forced circulation evaporator, the distilled water outlet end of the MVR low-temperature forced circulation evaporator is connected with the water inlet end of a secondary RO treatment device, and the concentrated liquid outlet end of the MVR low-temperature forced circulation evaporator is connected with the liquid inlet end of a concentrated liquid curing device.

As the utility model discloses another kind of improvement of domestic waste landfill leachate quantifys processing apparatus entirely, the steam discharging end of MVR evaporimeter is connected with the acid-base tower of breathing in.

As the utility model discloses another kind of improvement of domestic waste landfill leachate full-quantization processing apparatus, the MVR evaporimeter is including the casing be equipped with heat exchange tube group in the casing, heat exchange tube group both ends are all stretched out the casing one side is equipped with collection vapour portion, the entrance point of heat exchange tube group with collection vapour portion communicates the casing opposite side is equipped with liquid collection portion, the exit end of heat exchange tube group with collection liquid portion communicates be equipped with the shower in the casing of heat exchange tube group upside, the shower is linked together with the inlet tube casing upper portion is equipped with steam outlet, steam outlet is connected with steam compressor's steam inlet, steam compressor's play steam port with collection vapour portion is connected be equipped with the defroster in the steam outlet, the liquid outlet of liquid collection portion lower extreme is connected with the condensate drain pipe casing lower extreme middle part is equipped with the heat well, the heat well is connected with the filter, the liquid outlet end of filter is connected with the drain pipe, the liquid outlet end of filter is linked together with the shower through the circulating pump, the lower extreme of heat well is linked together with the drain pipe, still including heat exchanger, condensate liquid outlet pipe, drain pipe, heat exchanger, drain pipe and drain pipe are connected with the drain pipe respectively.

As the utility model discloses another kind of improvement of domestic waste landfill leachate quantifys processing apparatus, step S1 and step S2 go on in preprocessing device, wherein preprocessing device is including base, support, shell and former liquid jar, the upside of base is connected with the support, the upper portion of support is connected with the shell, be equipped with the former liquid jar that is used for bearing filtration liquid on the shell, still including the former liquid pump, drawing liquid pump and first conveyer pipe, the former liquid pump rather than the intercommunication is installed to the lower part of former liquid jar, first conveyer pipe is provided with two from top to bottom, the one end and the former liquid jar intercommunication of the first conveyer pipe of top, the intercommunication has the drawing liquid pump between the one end of the other end and another first conveyer pipe.

As the utility model discloses another kind of improvement of domestic waste landfill leachate quantifys processing apparatus, still including fiber filter and core formula filter, the upside of base install fiber filter and with the core formula filter of fiber filter intercommunication, the first conveyer pipe intercommunication in core formula filter and below.

As the utility model discloses another kind of improvement of domestic waste landfill leachate full-quantization processing apparatus, still including the metering pump, the metering pump with the liquid storage pot intercommunication is installed to the upper right side of shell.

As the utility model discloses another kind of improvement of domestic waste landfill leachate quantitive processing apparatus, still including extension board, liquid storage pot and second conveyer pipe, the middle part rear side of shell is connected with the liquid storage pot that is used for storing concentrated sulfuric acid through the extension board, and the intercommunication has the second conveyer pipe between liquid storage pot and the metering pump.

As the utility model discloses another kind of improvement of domestic waste landfill leachate quantitive processing apparatus, still including mounting bracket, motor and pivot, the motor is installed through the mounting bracket in the left side of former liquid jar, is connected with the rotary type on the output shaft of motor and runs through in the pivot of former liquid jar, still including the flabellum, is connected with the flabellum in the pivot.

To sum up, the utility model discloses for its beneficial effect of prior art is:

the utility model discloses can effectively get rid of the suspended solid in the landfill leachate, can effectively reduce evaporimeter scale deposit speed and reduce the ammonia nitrogen that the evaporation produced the aquatic.

The utility model discloses a fiber filter and core formula filter carry out the two-stage filtration to filtration liquid conveniently to this ensures out the water suspended solid and falls to 200mg/L, promotes filtration liquid through the drawing liquid pump, carries concentrated sulfuric acid through the metering pump, with this need not in advance or open the device midway and add, has made things convenient for operating personnel's operation.

The utility model discloses starter motor, the output shaft of motor can drive the flabellum rotation through the pivot, and the flabellum can stir filtration liquid and the concentrated sulfuric acid that mixes to this scale deposit speed when reducing subsequent processing and reduce the ammonia nitrogen that evaporates and produce the aquatic, make the ammonia nitrogen most in the dense solution exist with the form of ammonium ion, avoid it to evaporate out along with the water vapor.

Drawings

Fig. 1 is a schematic view of the present invention.

Fig. 2 is a schematic structural diagram of the MVR evaporator of the present invention.

Fig. 3 is a schematic view of a first three-dimensional structure of the pretreatment device of the present invention.

Fig. 4 is a cross-sectional view of the pretreatment device of the present invention.

Fig. 5 is a schematic diagram of a second three-dimensional structure of the pretreatment device of the present invention.

Description of the preferred embodiment

The above and further features and advantages of the present invention will be described in more detail below with reference to the accompanying drawings.

Preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only for explaining the technical principle of the present invention, and do not limit the scope of the present invention.

It should be noted that in the description of the present invention, the terms of direction or positional relationship indicated by the terms "upper", "lower", "left", "right", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, which are only for convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.

Furthermore, it should be noted that, unless otherwise explicitly stated or limited in the description of the present invention, the terms "mounted," "connected" and "connected" are to be construed broadly and may be, for example, fixedly connected, detachably connected or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

Examples

Referring to fig. 1, the fully-quantized treatment device for percolate in a domestic garbage landfill comprises an MVR evaporator 20, wherein a liquid inlet end of the MVR evaporator 20 is connected with a pretreatment device 30, a steam output end of the MVR evaporator 20 is connected with a steam inlet end of an alkaline washing tower 40, a steam outlet end of the alkaline washing tower 40 is connected with a steam inlet end of a compressor 50, a steam outlet end of the compressor 50 is connected with a steam inlet end of the MVR evaporator 20, a concentrated liquid outlet end of the MVR evaporator 20 is connected with a liquid inlet end of an MVR low-temperature forced circulation evaporator 60, a distilled water outlet end of the MVR low-temperature forced circulation evaporator 60 is connected with a water inlet end of a secondary RO treatment device 70, and a concentrated liquid outlet end of the MVR low-temperature forced circulation evaporator 60 is connected with a liquid inlet end of a concentrated liquid curing device 80.

The vapor discharge end of the MVR evaporator 20 is connected to an acid-base suction tower 90.

The treatment process based on the full-quantization treatment device for the percolate of the household garbage landfill comprises the following steps of:

s1, pretreatment

Performing two-stage filtration on the landfill leachate by adopting a fiber filter and a core filter to reduce the content of suspended matters by 180-250mg/L;

contain the suspended solid of higher content among the landfill leachate, for ensureing follow-up processing unit steady operation, need carry out the preliminary treatment to it and reduce the suspended solid, the utility model discloses a fiber filter and core formula filter carry out the two-stage filtration to it, effectively ensure that the play water suspended solid can fall to relevant suitable content standard.

S2, adjusting the pH value

The garbage percolate from which suspended matters are removed is firstly lifted to a raw liquid tank by a pump, and concentrated sulfuric acid is added into the raw liquid tank by a metering pump and stirred simultaneously; in the process step, concentrated sulfuric acid is added, so that the scaling speed of an evaporator can be effectively reduced, the ammonia nitrogen in evaporation produced water can be reduced, the pH of the landfill leachate in the raw liquid tank is adjusted to 5.5-6.5 by the concentrated sulfuric acid, most of the ammonia nitrogen in the concentrated solution exists in the form of ammonium ions, and the ammonia nitrogen is prevented from evaporating out along with water vapor.

S3, concentrating by an MVR evaporator

Pumping the landfill leachate after pH adjustment into an MVR evaporator, evaporating water in the landfill leachate to form water vapor, feeding the water vapor into an alkaline washing system, and collecting residual concentrated solution of the landfill leachate in a hot well at the lower part of the MVR evaporator;

the preheated landfill leachate or/and concentrated solution stored in a hot well at the bottom of the MVR evaporator are mixed by a circulating pump and then pumped into a spray pipe at the upper part of the MVR evaporator, the landfill leachate or mixed solution is uniformly sprayed on the outer surface of a heat exchange pipe bundle to form a liquid film, the liquid film is heated, boiled and evaporated in the process of flowing downwards from the heat exchange pipe bundle, and the residual part, namely the concentrated solution, is collected in the hot well at the lower part of the evaporator.

The evaporation takes place at the tube bank surface, the regenerated steam of formation, through efficient vapor compressor with the pressure and the temperature improvement of steam, form the inside that saturated steam got into heat exchange tube bank, on the one hand give the incoming water film of tube bank surface with heat energy transfer in order to form the evaporation, on the other hand, this saturated steam is cooled off in the tube bank, distilled water forms and is collected the water cavity in the pipe, then flash distillation to a degasser, the organic gas that probably recondenses to distilled water can very effectually be eliminated in the flash distillation, defogging net can make the quality of distilled water better.

The concentrated solution after continuous concentration is collected at the bottom of the hot well and pumped out to a separation chamber of the forced circulation evaporation system by a concentrated solution pump.

The utility model discloses utilize horizontal pipe falling film MVR evaporimeter, carry out concentration decrement earlier, reduced the handling capacity of forced circulation evaporimeter, the energy consumption is low, has wholly reduced the working costs.

S4, steam alkali washing

Washing water vapor generated in the MVR evaporation treatment process by using high-temperature alkali liquor to enable COD in the vapor to react with the high-temperature alkali liquor and be trapped in the alkali liquor, so that the vapor is purified, the COD in the vapor distilled water is reduced, and the load of subsequent membrane advanced treatment is reduced;

certain COD is carried in the high-temperature steam generated by evaporation, most of the part of the COD belongs to organic acid, and the high-temperature liquid caustic soda is used for washing the high-temperature liquid caustic soda in the process step, so that more than 99% of the COD in the steam is intercepted in the liquid caustic soda through the reaction with the high-temperature liquid caustic soda, thereby purifying the steam, and reducing the COD in the steam distilled water and the load of deep membrane treatment.

S5, MVR low-temperature forced circulation concentration

Controlling the garbage percolation concentrated solution generated in the MVR evaporation treatment process to enter an MVR low-temperature forced circulation concentration evaporator for treatment, sending the obtained concentrated solution to a concentrated solution solidification treatment device, and sending the obtained distilled water to a secondary RO treatment device for treatment;

s6, two-stage RO treatment

Treating the distilled water after MVR low-temperature forced circulation concentration and the distilled water generated by the MVR evaporator by adopting a two-stage roll type RO, and reducing the content of ammonia nitrogen in the distilled water;

the RO membrane, also called reverse osmosis membrane, applies pressure to raw water by machine, so that water in the raw water can permeate the RO membrane, and retains fine impurities, excessive inorganic salts, organic matters, heavy metal ions, bacteria, viruses, pesticides, trichloromethane waste water and other harmful substances in the raw water, and discharges the harmful foreign matters and salt through continuously discharged concentrated water.

A reverse osmosis membrane is a membrane selective to a substance to be permeated is called a semipermeable membrane, and a membrane permeable only to a solvent and impermeable to a solute is generally called an ideal semipermeable membrane. When the same volume of dilute solution (e.g., fresh water) and concentrated solution (e.g., brine) is placed on each side of the semi-permeable membrane, the solvent in the dilute solution will naturally flow through the semi-permeable membrane spontaneously to the concentrated solution side, a phenomenon known as osmosis. When the osmosis reaches the equilibrium, the liquid level of the concentrated solution side is higher than the liquid level of the dilute solution by a certain height, namely, a pressure difference is formed, and the pressure difference is the osmotic pressure. The magnitude of the osmotic pressure depends on the inherent properties of the solution, i.e. on the type, concentration and temperature of the concentrated solution and not on the properties of the semipermeable membrane. If a pressure greater than the osmotic pressure is applied to the concentrated solution side, the solvent will flow in the opposite direction to the original direction of osmosis, and will start to flow from the concentrated solution to the dilute solution side, a process known as reverse osmosis. Reverse osmosis, a reverse migration movement of osmosis, is a separation method for separating solute from solvent in solution by means of selective interception of semipermeable membrane under the driving of pressure, and is widely used for purification and concentration of various liquids, wherein the most common application example is in water treatment process, impurities such as inorganic ions, bacteria, viruses, organic matters and colloids in raw water are removed by using reverse osmosis technology.

And adopting a two-stage roll type RO as a standard outlet water guarantee unit of the percolate treatment system. Through two-stage roll-type RO treatment, ammonia nitrogen in the evaporated distilled water can reach the standard stably, the concentrated water quality of the roll-type membrane is better, and the ammonia nitrogen returns to the foremost one-stage MVR evaporator for further treatment and reaches the standard.

S7, deep processing

Performing advanced treatment on the effluent subjected to the two-stage roll-type RO treatment by adopting an ion exchange system;

the ion exchange method is a method for removing ammonia nitrogen in wastewater by using a material with strong selective adsorption on ammonia ions. The adsorption material of the utility model adopts one of zeolite molecular sieve, active carbon, montmorillonite and exchange resin. Zeolite is aluminosilicate with three-dimensional structure, regular pore structure and cavities, wherein clinoptilolite has strong selective adsorption capacity to ammonia ions and low price.

S8, solidifying the concentrated solution

Pumping concentrated solution generated in the MVR evaporation treatment process into a mixing stirrer by a pump, adding a stabilizer, fully stirring and mixing, and conveying the slurry to a mold through a conveyor to be solidified and molded. The stabilizer comprises lime, cement and a chelating agent. Wherein the mass ratio of the lime to the cement to the chelating agent is 30:20:1.

pumping the concentrated solution after final evaporation into a mixing stirrer by a pump, and simultaneously conveying the stabilizer (one or more) from a stabilizer bin to the mixing stirrer. The concentrated solution and the curing agent are fully mixed and stirred in the mixing stirrer, and the proportion of the curing agents is adjusted through debugging, so that the solidification time is shortest, the solidification time has certain compressive strength, the dosage of the medicament is minimum, and the leaching rate of residues is minimum. Mixing and stirring are generally from 5 to 10 minutes. And after the slurry is fully mixed, conveying the slurry to a mold through a conveyor to be solidified and molded.

Step S9, tail gas treatment: the non-condensable gas generated in the MVR evaporation treatment process and the odor generated in the pH value adjusting process are collected in the tank body and conveyed to the acid-base washing tower through the fan for treatment.

According to the component of tail gas the utility model discloses a technology of "acid-base absorption + purification liquid absorbs" is handled tail gas. The acid-base washing process is to utilize the irreversible chemical reaction between the bad smell component and the main component of chemical liquid medicine to produce new odorless matter for deodorizing. The malodorous gas is sprayed and washed by acid-alkali liquor through a washing tower for deodorization, generally water washing can only remove the soluble or partially slightly water-soluble malodorous substances, acid washing can remove the alkaline malodorous substances such as ammonia, amines and the like, and alkali washing is suitable for removing the malodorous substances such as hydrogen sulfide, lower fatty acid and the like.

Therefore, in order to completely remove high-concentration malodorous substances and H2S present in the exhaust gas, a multi-stage chemical scrubbing method may be generally used for deodorization. The chemicals often used are sulfuric acid and NaOH solution, etc.

Reaction of ammonia with water

When ammonia is dissolved in water, ammonia molecules and water molecules are combined into ammonia monohydrate (NH 3. H2O) through hydrogen bonds, and a small part of the ammonia monohydrate can be ionized into ammonium ions and hydroxide ions, so that the ammonia water is weakly alkaline. The reaction of ammonia in water can be expressed as: the ammonium monohydrate is unstable and is decomposed by heat to generate ammonia and water, and the ammonia water has three molecules, three ions and three equilibria, wherein the molecular: NH3, NH 3. H2O, H2O; ion: NH4+, OH-, H +; and (3) balancing: NH3+ H2O 8652NH 3. H2O, NH 3. H2O 8652NH 3. H2O, NH4+ + OH-, H2O 8652H + + OH-

Reaction of ammonia with sulfuric acid

H2SO4+2NH3=2NH4HSO4 (ammonia to sulfuric acid molar ratio is less than or equal to 1

H2SO4+2NH3= (NH 4) 2SO4 (when the molar ratio of ammonia gas to sulfuric acid is more than or equal to 2

3H2SO4+2NH3= (NH 4) 2SO4+ NH4HSO4 (molar ratio of ammonia to sulfuric acid 1

Reaction of hydrogen sulfide with sodium hydroxide

The hydrogen sulfide reacts with alkali such as sodium hydroxide to generate soluble sodium sulfide. When the hydrogen sulfide is excessive, sodium hydrosulfide is generated, and is adjusted by alkali and then is converted into sodium sulfide:

H2S+2NaOH=Na2S+2H2O、H2S+NaOH=NaHS+H2O、

NaHS+NaOH=Na2S+H2O

examples

Referring to fig. 1-5, a full-quantization treatment device for leachate in a domestic refuse landfill is characterized in that: the system comprises an MVR evaporator 20, wherein a pretreatment device 30 is connected to a liquid inlet end of the MVR evaporator 20, a steam output end of the MVR evaporator 20 is connected with a steam inlet end of an alkaline washing tower 40, a steam outlet end of the alkaline washing tower 40 is connected with a steam inlet end of a compressor 50, a steam outlet end of the compressor 50 is connected with a steam inlet end of the MVR evaporator 20, a concentrated liquid outlet end of the MVR evaporator 20 is connected with a liquid inlet end of an MVR low-temperature forced circulation evaporator 60, a distilled water outlet end of the MVR low-temperature forced circulation evaporator 60 is connected with a water inlet end of a secondary RO treatment device 70, and a concentrated liquid outlet end of the MVR low-temperature forced circulation evaporator 60 is connected with a liquid inlet end of a concentrated liquid curing device 80. The vapor discharge end of the MVR evaporator 20 is connected to an acid-base suction tower 90.

The treatment process based on the full-quantitative treatment device for the percolate of the domestic garbage landfill comprises the following steps:

s1, pretreatment

Performing two-stage filtration on the landfill leachate by adopting a fiber filter and a core filter to reduce the content of suspended matters by 180-250mg/L;

contain higher content's suspended solid in landfill leachate, for the stable operation of guarantee follow-up processing unit, need carry out the preliminary treatment to it and reduce the suspended solid, the utility model discloses a fiber filter and core filter carry out the two-stage filtration to it, effectively ensure that the play water suspended solid can drop to relevant suitable content standard.

S2, adjusting the pH value

The garbage percolate from which suspended matters are removed is firstly lifted to a raw liquid tank by a pump, and concentrated sulfuric acid is added into the raw liquid tank by a metering pump and stirred simultaneously; in the process, concentrated sulfuric acid is added, so that the scaling speed of an evaporator can be effectively reduced, ammonia nitrogen in evaporation produced water can be reduced, the pH of landfill leachate in a stock solution tank is adjusted to 5.5-6.5 by using the concentrated sulfuric acid, most of the ammonia nitrogen in the concentrated solution exists in the form of ammonium ions, and evaporation of the ammonia nitrogen along with water vapor is avoided.

S3, concentrating by an MVR evaporator

Pumping the garbage percolate after pH adjustment into an MVR evaporator to evaporate water in the garbage percolate to form water vapor, wherein the water vapor enters an alkaline washing system, and the residual part of concentrated solution of the garbage percolate is collected in a hot well at the lower part of the MVR evaporator;

the MVR evaporator comprises a shell 200, a heat exchange tube set 201 is arranged in the shell 200, two ends of the heat exchange tube set 201 extend out of the shell 200, a steam collecting part 202 is arranged on one side of the shell 200, an inlet end of the heat exchange tube set 201 is communicated with the steam collecting part 202, a liquid collecting part 203 is arranged on the other side of the shell 200, an outlet end of the heat exchange tube set 201 is communicated with the liquid collecting part 203, a spray pipe 204 is arranged in the shell 200 on the upper side of the heat exchange tube set 201, the spray pipe 204 is communicated with a water inlet pipe 205, a steam outlet 206 is arranged on the upper portion of the shell 200, the steam outlet 206 is connected with a steam inlet of a steam compressor 207, a steam outlet of the steam compressor 207 is connected with the steam collecting part 202, a demister 208 is arranged in the steam outlet 206, a liquid outlet at the lower end of the liquid collecting part 203 is connected with a condensate liquid outlet pipe 209, a heat well 210 is arranged in the middle of the lower end of the shell 200, the heat well 210 is connected with a filter 211, an outlet end of the filter 211 is connected with a liquid outlet 212, a liquid outlet of the filter 211 is communicated with the spray pipe 204 through a circulating pump 213, a liquid outlet of the condensate liquid well 210 is communicated with a drain pipe 212, and a drain pipe 214 is connected with the heat exchanger 214, and a drain pipe 214 are respectively.

The preheated landfill leachate or/and concentrated solution stored in a hot well at the bottom of the MVR evaporator are/is mixed by a circulating pump and then pumped into a spraying pipe at the upper part of the MVR evaporator, the landfill leachate or the mixed solution is uniformly sprayed on the outer surface of a heat exchange pipe bundle to form a liquid film, the liquid film is heated, boiled and evaporated in the process of flowing downwards from the heat exchange pipe bundle, and the residual part, namely the concentrated solution, is collected in the hot well at the lower part of the evaporator.

The evaporation takes place at the tube bank surface, the regenerated steam of formation, through efficient vapor compressor with the pressure and the temperature improvement of steam, form the inside that saturated steam got into heat exchange tube bank, on the one hand give the incoming water film of tube bank surface with heat energy transfer in order to form the evaporation, on the other hand, this saturated steam is cooled off in the tube bank, distilled water forms and is collected the water cavity in the pipe, then flash distillation to a degasser, the organic gas that probably recondenses to distilled water can very effectually be eliminated in the flash distillation, defogging net can make the quality of distilled water better.

The concentrated solution after continuous concentration is collected at the bottom of the hot well and pumped out to a separation chamber of the forced circulation evaporation system by a concentrated solution pump.

The utility model discloses utilize horizontal pipe falling film MVR evaporimeter, carry out the concentration decrement earlier, reduced the handling capacity of forced circulation evaporimeter, the energy consumption is low, has wholly reduced the working costs.

S4, steam alkali washing

Washing water vapor generated in the MVR evaporation treatment process by using high-temperature alkali liquor, so that COD in the vapor is intercepted in the liquid alkali after reacting with the high-temperature liquid alkali, thereby purifying the vapor, reducing the COD in the vapor distilled water and reducing the load of subsequent membrane advanced treatment;

certain COD is carried in the high-temperature steam generated by evaporation, most of the part of the COD belongs to organic acid, and the high-temperature liquid caustic soda is used for washing the high-temperature liquid caustic soda in the process step, so that more than 99% of the COD in the steam is intercepted in the liquid caustic soda through the reaction with the high-temperature liquid caustic soda, thereby purifying the steam, and reducing the COD in the steam distilled water and the load of deep membrane treatment.

S5, low-temperature forced circulation concentration of MVR

Controlling the landfill leachate concentrated solution generated in the MVR evaporation treatment process to enter an MVR low-temperature forced circulation concentration evaporator for treatment, sending the obtained concentrated solution to a concentrated solution solidification treatment device, and sending the obtained distilled water to a secondary RO treatment device for treatment;

s6, two-stage RO treatment

Treating the distilled water after MVR low-temperature forced circulation concentration and the distilled water generated by the MVR evaporator by adopting a two-stage roll type RO, and reducing the content of ammonia nitrogen in the distilled water;

the RO membrane, also called reverse osmosis membrane, applies pressure to raw water by machine, so that water in the raw water can permeate the RO membrane, and retains fine impurities, excessive inorganic salts, organic matters, heavy metal ions, bacteria, viruses, pesticides, trichloromethane waste water and other harmful substances in the raw water, and discharges the harmful foreign matters and salt through continuously discharged concentrated water.

A reverse osmosis membrane is a membrane selective to a substance to be permeated is called a semipermeable membrane, and a membrane permeable only to a solvent and impermeable to a solute is generally called an ideal semipermeable membrane. When the same volume of dilute solution (e.g., fresh water) and concentrated solution (e.g., saline) is placed on each side of the semi-permeable membrane, the solvent in the dilute solution will naturally flow through the semi-permeable membrane spontaneously to the concentrated solution side, a phenomenon known as osmosis. When the osmosis reaches the equilibrium, the liquid level of the concentrated solution side is higher than the liquid level of the dilute solution by a certain height, namely, a pressure difference is formed, and the pressure difference is the osmotic pressure. The magnitude of the osmotic pressure depends on the inherent properties of the solution, i.e. on the type, concentration and temperature of the concentrated solution and not on the properties of the semipermeable membrane. If a pressure greater than the osmotic pressure is applied to the concentrated solution side, the solvent will flow in the opposite direction to the original direction of osmosis, and will start to flow from the concentrated solution to the dilute solution side, a process known as reverse osmosis. Reverse osmosis, which is a reverse migration motion of osmosis, is a separation method of separating solute from solvent in solution by selective interception of semipermeable membrane under pressure driving, and is widely used for purification and concentration of various liquids, wherein the most common application example is to remove impurities such as inorganic ions, bacteria, viruses, organic matters and colloids in raw water by reverse osmosis technology in water treatment process.

And adopting a two-stage roll type RO as a standard outlet water guarantee unit of the percolate treatment system. Ammonia nitrogen in the evaporated distilled water can reach the standard stably through two-stage roll type RO treatment, the concentrated water quality of the roll type membrane is better, and the ammonia nitrogen returns to the foremost one-stage MVR evaporator to be further treated to reach the standard.

S7, deep processing

Performing advanced treatment on the effluent after the two-stage roll type RO treatment by adopting an ion exchange system;

the ion exchange method is a method for removing ammonia nitrogen in wastewater by using a material with strong selective adsorption on ammonia ions. The adsorption material of the utility model adopts one of zeolite molecular sieve, active carbon, montmorillonite and exchange resin. Zeolite is aluminosilicate with three-dimensional structure, regular pore structure and cavities, wherein clinoptilolite has strong selective adsorption capacity to ammonia ions and low price.

S8, solidifying the concentrated solution

Pumping concentrated solution generated in the MVR evaporation treatment process into a mixing stirrer by a pump, adding a stabilizer, fully stirring and mixing, and conveying the slurry to a mold through a conveyor to be solidified and molded. The stabilizer comprises lime, cement and a chelating agent. Wherein the mass ratio of the lime to the cement to the chelating agent is 30:20:1.

pumping the concentrated solution after final evaporation into a mixing stirrer by a pump, and simultaneously conveying the stabilizer (one or more) from a stabilizer bin to the mixing stirrer. The concentrated solution and the curing agent are fully mixed and stirred in the mixing stirrer, and the proportion of the curing agents is adjusted through debugging, so that the solidification time is shortest, the solidification time has certain compressive strength, the dosage of the medicament is minimum, and the leaching rate of residues is minimum. The mixing and stirring are generally carried out for 5 to 10 minutes. And after the slurry is fully mixed, conveying the slurry to a mould through a conveyor to be solidified and molded.

Step S9, tail gas treatment: the non-condensable gas generated in the MVR evaporation treatment process and the odor generated in the pH value adjusting process are collected in the tank body and conveyed to the acid-base washing tower through the fan for treatment.

According to the component of tail gas the utility model discloses a technology of "acid-base absorption + purification liquid absorbs" is handled tail gas. The acid-base washing process utilizes the irreversible chemical reaction between the odor component and the main component of the chemical liquor to produce new odorless substance so as to achieve the aim of deodorization. The malodorous gas is sprayed and washed by acid and alkali liquor through a washing tower for deodorization, generally, the water washing can only remove soluble or partially slightly soluble malodorous substances in water, the acid washing can remove alkaline malodorous substances such as ammonia, amines and the like, and the alkali washing is suitable for removing malodorous substances such as hydrogen sulfide, lower fatty acid and the like.

Therefore, in order to completely remove high-concentration malodorous substances and H2S present in the exhaust gas, a multi-stage chemical scrubbing method may be generally used for deodorization. The chemicals often used are sulfuric acid and NaOH solution, etc.

Reaction of ammonia with water

When ammonia is dissolved in water, ammonia molecules and water molecules are combined into ammonia monohydrate (NH 3. H2O) through hydrogen bonds, and a small part of the ammonia monohydrate can be ionized into ammonium ions and hydroxide ions, so that the ammonia water is weakly alkaline. The reaction of ammonia in water can be expressed as: the ammonium monohydrate is unstable and is decomposed by heat to generate ammonia and water, and the ammonia water has three molecules, three ions and three equilibria, wherein the molecular: NH3, NH 3. H2O, H2O; ion: NH4+, OH-, H +; and (3) balancing: NH3+ H2O (8652Ol), NH 3. H2O (8652Ol), NH4+ + OH-, H2O (8652Ol), H + + OH-

Reaction of ammonia with sulfuric acid

H2SO4+2NH3=2NH4HSO4 (ammonia to sulfuric acid molar ratio is less than or equal to 1

H2SO4+2NH3= (NH 4) 2SO4 (when the mol ratio of ammonia gas to sulfuric acid is more than or equal to 2

3H2SO4+2NH3= (NH 4) 2SO4+ NH4HSO4 (molar ratio of ammonia to sulfuric acid 1

Reaction of hydrogen sulfide with sodium hydroxide

The hydrogen sulfide reacts with alkali such as sodium hydroxide to generate soluble sodium sulfide. When the hydrogen sulfide is excessive, sodium hydrosulfide is generated, and is adjusted by adding alkali and is converted into sodium sulfide:

H2S+2NaOH=Na2S+2H2O、H2S+NaOH=NaHS+H2O、

NaHS+NaOH=Na2S+H2O

the utility model discloses step S1 and step S2 go on in preprocessing device, as shown in fig. 4, wherein preprocessing device is including base 1, support 2, shell 3, former liquid jar 31, former liquid pump 11, drawing liquid pump 6 and first conveyer pipe 7, the upside of base 1 is connected with support 2, the upper portion of support 2 is connected with shell 3, be equipped with the former liquid jar 31 that is used for bearing filtration liquid on the shell 3, former liquid pump 11 rather than the intercommunication is installed to the lower part of former liquid jar 31, first conveyer pipe 7 is provided with two from top to bottom, the one end and the former liquid jar 31 intercommunication of the first conveyer pipe 7 of top, the intercommunication has drawing liquid pump 6 between the one end of the other end and another first conveyer pipe 7.

As shown in fig. 2, the filter device further comprises a fiber filter 4 and a core filter 5, wherein the fiber filter 4 and the core filter 5 communicated with the fiber filter 4 are installed on the upper side of the base 1, and the core filter 5 is communicated with a lower first conveying pipe 7.

As shown in fig. 5, the device further comprises a metering pump 8, and the metering pump 8 communicated with the liquid storage tank 10 is installed on the upper side of the right part of the shell 3 in a bolt connection mode.

As shown in fig. 5, the device further comprises a support plate 9, a liquid storage tank 10 and a second delivery pipe 101, the rear side of the middle part of the housing 3 is connected with the liquid storage tank 10 for storing concentrated sulfuric acid through the support plate 9, and the second delivery pipe 101 is communicated between the liquid storage tank 10 and the metering pump 8.

As shown in fig. 4, the device further comprises a mounting frame 12, a motor 13 and a rotating shaft 14, the motor 13 is mounted on the left side of the raw liquid tank 31 through the mounting frame 12, and the rotating shaft 14 rotatably penetrating through the raw liquid tank 31 is connected to an output shaft of the motor 13.

As shown in fig. 4, the fan blade device further includes a fan blade 15, and the fan blade 15 is connected to the rotating shaft 14.

The operator can use the corresponding technical scheme in this device in the technology of domestic waste landfill leachate full-quantization processing apparatus according to the concrete situation, when the operator needs to use this device to assist the operation of carrying out leachate pretreatment, firstly, the operator injects the leachate into the inside of fiber filter 4, inject concentrated sulfuric acid into the inside of liquid storage tank 10, the leachate can flow into the inside of core filter 5 through fiber filter 4, so as to carry out two-stage filtration on the leachate through fiber filter 4 and core filter 5, thereby ensure that the effluent suspended matter is reduced to 200mg/L, then the operator starts up liquid drawing pump 6, liquid drawing pump 6 can promote the leachate from the inside of core filter 5 through removing the suspended matter to the inside of raw liquid tank 31 through first conveyer pipe 7, after the leachate is promoted to the inside of raw liquid tank 31, the operator restarts metering pump 8, metering pump 8 can input the concentrated sulfuric acid in liquid storage tank 10 through second conveyer pipe 101 to the inside of raw liquid tank 31 to mix with the leachate, at this moment, the operator starts up motor 13, the output shaft of motor 13 can drive flabellum 15, the rotary impeller 15 can reduce the concentrated sulfuric acid evaporation speed of concentrated sulfuric acid from the concentrated sulfuric acid of the mixed leachate to the concentrated sulfuric acid evaporation water of the concentrated sulfuric acid evaporation liquid storage tank 10 and reduce the concentrated ammonia nitrogen evaporation process, the concentrated ammonia nitrogen evaporation process of the concentrated ammonia nitrogen concentration water, the concentrated ammonia nitrogen evaporation water of the concentrated ammonia nitrogen evaporation system, the concentrated ammonia nitrogen evaporation process can be reduced by this concentrated ammonia nitrogen evaporation, the concentrated ammonia nitrogen evaporation system, the last concentrated ammonia nitrogen evaporation process.

The basic principles and main features of the invention and the advantages of the invention have been shown and described above. It will be understood by those skilled in the art that the present invention is not limited to the above embodiments, and that the foregoing embodiments and descriptions are provided only to illustrate the principles of the present invention without departing from the spirit and scope of the present invention. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims (8)

1. The utility model provides a full quantization processing apparatus of domestic waste landfill leachate, including MVR evaporimeter (20), its characterized in that: the liquid inlet end of the MVR evaporator (20) is connected with a pretreatment device (30), the steam output end of the MVR evaporator (20) is connected with the steam inlet end of an alkaline washing tower (40), the steam outlet end of the alkaline washing tower (40) is connected with the steam inlet end of a compressor (50), the steam outlet end of the compressor (50) is connected with the steam inlet end of the MVR evaporator (20), the concentrated liquid outlet end of the MVR evaporator (20) is connected with the liquid inlet end of the MVR low-temperature forced circulation evaporator (60), the distilled water outlet end of the MVR low-temperature forced circulation evaporator (60) is connected with the water inlet end of a secondary RO treatment device (70), and the concentrated liquid outlet end of the MVR low-temperature forced circulation evaporator (60) is connected with the liquid inlet end of a concentrated liquid curing device (80).

2. The fully quantitative treatment device for percolate of domestic refuse landfill according to claim 1, characterized in that the steam discharge end of the MVR evaporator (20) is connected with an acid-base suction tower (90).

3. The fully quantitative treatment device for percolate in domestic refuse landfill according to claim 1, wherein the MVR evaporator (20) comprises a housing (200), a heat exchange tube set (201) is arranged in the housing (200), both ends of the heat exchange tube set (201) extend out of the housing (200), a steam collecting part (202) is arranged on one side of the housing (200), the inlet end of the heat exchange tube set (201) is communicated with the steam collecting part (202), a liquid collecting part (203) is arranged on the other side of the housing (200), the outlet end of the heat exchange tube set (201) is communicated with the liquid collecting part (203), a spray pipe (204) is arranged in the housing (200) on the upper side of the heat exchange tube set (201), the spray pipe (204) is communicated with a water inlet pipe (205), a steam outlet (206) is arranged on the upper part of the housing (200), the steam outlet (206) is connected with the inlet of a steam compressor (207), the steam outlet of the steam compressor (207) is connected with the steam collecting part (202), a steam outlet (206) is arranged in the middle of the housing (200), a liquid outlet (210) is connected with a heat collecting well (210), and a demister (210) is arranged on the lower end of the housing (211), the liquid outlet end of the filter (211) is connected with a water outlet pipe (212), the liquid outlet end of the filter (211) is communicated with the spray pipe (204) through a circulating pump (213), the lower end of the hot well (210) is communicated with the water outlet pipe (212), the heat exchanger (214) is further included, and the condensate liquid outlet pipe (209), the water outlet pipe (212) and the water inlet pipe (205) are respectively connected with the heat exchanger (214).

4. The fully quantitative leachate treatment device for the domestic refuse landfill according to claim 1, wherein the pretreatment device comprises a base (1), a support (2), a shell (3) and a raw solution tank (31), the support (2) is connected to the upper side of the base (1), the shell (3) is connected to the upper portion of the support (2), the raw solution tank (31) for bearing leachate is arranged on the shell (3), the fully quantitative leachate treatment device further comprises a raw solution pump (11), a liquid pumping pump (6) and a first conveying pipe (7), the raw solution pump (11) communicated with the raw solution tank (31) is installed on the lower portion of the raw solution tank (31), the first conveying pipe (7) is vertically provided with two conveying pipes, one end of the first conveying pipe (7) above is communicated with the raw solution tank (31), and the liquid pumping pump (6) is communicated between the other end of the first conveying pipe (7).

5. The full-quantitative treatment device for the percolate of the domestic garbage landfill according to claim 4, further comprising a fiber filter (4) and a core type filter (5), wherein the fiber filter (4) and the core type filter (5) communicated with the fiber filter (4) are installed on the upper side of the base (1), and the core type filter (5) is communicated with the first conveying pipe (7) below.

6. The full-quantitative leachate treatment device for the domestic refuse landfill as claimed in claim 4, further comprising a metering pump (8), wherein the metering pump (8) communicated with the liquid storage tank (10) is installed on the upper right side of the housing (3).

7. The full-quantitative treatment device for the leachate in the domestic refuse landfill according to claim 4, further comprising a support plate (9), a liquid storage tank (10) and a second delivery pipe (101), wherein the liquid storage tank (10) for storing concentrated sulfuric acid is connected to the rear side of the middle part of the housing (3) through the support plate (9), and the second delivery pipe (101) is communicated between the liquid storage tank (10) and the metering pump (8).

8. The device for fully processing percolate of the domestic refuse landfill according to claim 4, further comprising a mounting frame (12), a motor (13) and a rotating shaft (14), wherein the motor (13) is mounted on the left side of the raw liquid tank (31) through the mounting frame (12), the rotating shaft (14) which rotatably penetrates through the raw liquid tank (31) is connected to an output shaft of the motor (13), and further comprising fan blades (15), and the fan blades (15) are connected to the rotating shaft (14).

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