CN219239440U - System for full quantization of landfill leachate - Google Patents
System for full quantization of landfill leachate Download PDFInfo
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- CN219239440U CN219239440U CN202223131661.7U CN202223131661U CN219239440U CN 219239440 U CN219239440 U CN 219239440U CN 202223131661 U CN202223131661 U CN 202223131661U CN 219239440 U CN219239440 U CN 219239440U
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Abstract
The utility model belongs to the technical field of garbage treatment, and particularly relates to a full-quantization treatment system for garbage percolate. The technical scheme provided by the utility model is a full-quantitative treatment technology capable of treating garbage percolate and membrane concentrated solution, and has the characteristics of high-efficiency denitrification and carbon reduction, simple equipment maintenance, convenient equipment installation and disassembly and stable standard-reaching discharge of treated sewage.
Description
Technical Field
The utility model belongs to the technical field of garbage treatment, and particularly relates to a full-quantization treatment system for garbage leachate.
Background
The garbage percolate comprises compressed liquid of a garbage transfer station, percolate of a garbage landfill and a garbage incineration plant, and is derived from water, rain and snow water and other water contained in garbage, the saturated water holding capacity of garbage and an overburden layer is deducted, and the garbage and the overburden layer are subjected to garbage layer and overburden layer to form high-concentration organic wastewater. Has high COD concentration and BOD 5 Low concentration, high metal content, large water quality and quantity change, high ammonia nitrogen content, imbalance of the proportion of nutrient elements of microorganisms and the like.
The garbage leachate is treated by adopting a two-stage DTRO membrane filtration mode, and the generated membrane concentrate is used for recharging a landfill garbage pile or temporary storage concentrate pool. The membrane concentrate recharging garbage heap can increase the concentration and conductivity of refractory pollutants in the leachate, and reduce the clear water yield of the garbage leachate treated by the DTRO membrane.
In the pollution control Standard for landfill (manuscript for opinion) recently issued 2022, 9.3.2 clearly specifies: the concentrated solution generated by treating the percolate should be treated independently and cannot be recycled to a domestic garbage landfill or enter a sewage centralized treatment facility. ". Therefore, there is a need to develop new technologies to solve the problem of disposal of landfill leachate and membrane concentrate.
Disclosure of Invention
Aiming at the technical characteristics that the conventional common landfill leachate treatment technology generates membrane concentrate, the membrane concentrate has high treatment difficulty, dangerous waste salt mud is generated in evaporation and crystallization treatment, the utility model develops a full-quantification treatment technology capable of treating the landfill leachate and the membrane concentrate, and the technology has the characteristics of high-efficiency denitrification and carbon reduction, simple equipment maintenance, convenient equipment installation and disassembly and stable standard-reaching discharge of treated sewage.
The technical scheme provided by the utility model is as follows:
the utility model provides a full quantization processing system of landfill leachate, includes bag filter, coagulating sedimentation device, coagulating sedimentation solid-liquid separation machine, combination air supporting device, electrochemical processor, hydrolytic acidification pond, denitrification decarbonization pond and MBR membrane pond that communicate in proper order and set up, denitrification decarbonization pond can be used to carry out synchronous short range nitrification denitrification. The devices are connected through pipelines or holes, and landfill leachate or membrane concentrate is discharged after being treated by the systems.
The pretreatment system comprises a raw water pump, a bag filter and other equipment, and separates solid impurities, large particles and the like of landfill leachate or membrane concentrate from sewage.
Comprises a physical and chemical treatment system consisting of a coagulating sedimentation device and a combined air floatation device, and the suspended matters and colloid substances in garbage percolate or membrane concentrate are removed by a two-step combined method. The coagulant PAC solution is mainly added into the coagulating sedimentation device, the addition amount of PAC can be 0.5 to 2.5 weight percent, the addition amount of flocculant PAM solution, PAM can be 0.05 to 0.15 weight percent, and the addition amount of PAM is within the range of 5 to 10 pH and Al is less than 5 to 10 3+ Hydrolysis-polymerization to form Al (OH) 3 And (3) carrying out electric neutralization and destabilization on humic acid colored macromolecules, forming large particles under the action of adsorption bridging, then carrying out combined action with PAM, and finally polymerizing into precipitate for removal, thereby reducing COD and chromaticity of the percolate.
The electrochemical processor can adopt multistage three-dimensional electrolysis to connect in series, break up non-biodegradable macromolecules in the landfill leachate or the membrane concentrate into small molecules, improve the biodegradability of sewage, and provide conditions for subsequent biological treatment. In an electrochemical treatment system, under the action of electric energy, active metal oxide is generated on the surface of an anode, so that the active metal oxide reacts with organic matters in water:
RO x (OH) y +zM→RO x +zH + +2e - +zMO
RO x+1 +M→RO x +MO
in the formula of RO x (OH) y -adsorbing OH metal oxide;
RO x+1 -metal oxides of high valence state;
m-organic.
In addition, H in solution 2 O or OH - Is electrolyzed and oxidized to hydroxyl radical (OH) on the surface of the anode, so that most organic matters in the sewage can be oxidized and degraded.
Most landfill leachate also contains chloride ions, and can be oxidized into hypochlorite during electrolysis, and the strong oxidizing property of the hypochlorite can also degrade organic matters.
Under the direct action and the indirect action, the electrochemical processor breaks high bond energy groups such as double bonds, triple bonds, large pi bonds and the like contained in humic acid, phenols and aromatic macromolecular organic matters which are not removed in a materialization system, breaks the macromolecular bonds to form new micromolecules, is convenient for microorganisms to utilize, and improves the biodegradability of sewage.
The hydrolysis acidification tank, the high-efficiency denitrification and carbon reduction tank and the MBR membrane tank form a biochemical treatment system.
The reaction equation in the conventional nitrification and denitrification process is as follows:
NH 4 + -N→NO 2 - -N→NO 3 - -N→NO 2 - -N→N 2
the reaction equation in the short-cut nitrification and denitrification process is as follows:
NH 4 + -N→NO 2 - -N→N 2
compared with the two, the short-cut nitrification and denitrification are less than the whole-course nitrification and denitrification 2 - -N→NO 3 - -N and NO 3 - -N→NO 2 - The reaction of N two steps can save NO 2 - -N→NO 3 - N-step oxygen supply while also reducing NO 3 - -N→NO 2 - Carbon source consumption of the N process.
In the denitrification and decarbonization tank, synchronous short-cut nitrification and denitrification can be performed by controlling the pH value, oxygen supply amount and the like in the reactor, so that the occupied space can be effectively saved.
The sewage after biochemical treatment enters an MBR membrane tank after precipitation, so that the load of an MBR membrane is reduced, the service life of the MBR membrane is prolonged, and the stable standard of effluent SS can be ensured.
The technical scheme is as follows:
the physical and chemical treatment system adopts coagulating sedimentation and combined air floatation to treat suspended matters and colloid substances in the landfill leachate/membrane concentrate step by step, so that more than 30% of COD in the sewage can be removed, and the chromaticity of the sewage can be reduced;
the electrochemical treatment can effectively improve the biodegradability of the landfill leachate/membrane concentrate;
by adopting synchronous short-cut nitrification and denitrification, 40% of carbon source supplement can be saved, 30% of energy consumption can be reduced, and 30% of treatment pool volume can be reduced.
Specifically, the outlet of the coagulating sedimentation device is communicated with a coagulating sedimentation solid-liquid separator.
Specifically, the liquid outlet of the coagulating sedimentation solid-liquid separator is communicated with the combined air floatation device.
Further, a mud outlet of the combined air floatation device is communicated with the coagulating sedimentation solid-liquid separator.
Further, a mud outlet of the denitrification and decarbonization tank is communicated with an activated sludge dehydrator.
Further, a sludge outlet of the MBR membrane tank is communicated with an activated sludge dehydrator.
Further, a liquid outlet of the activated sludge dewatering machine is communicated with the denitrification and decarbonization tank.
Based on the technical scheme, the slag discharge of the coagulating sedimentation device and the mud discharge of the combined air floatation device can be utilized as resources.
Specifically, the coagulating sedimentation device is a static mixer.
Specifically, in the electrochemical processor:
the electrolysis power supply adopts a pulse power supply, the current density can be controlled at 50-300A/square meter, and the voltage can be controlled at 2-10V, so that the effect is that the chromaticity is reduced and the energy-saving purpose is achieved;
the anode is a titanium-based ruthenium-iridium plated electrode or a titanium-based lead oxide plated electrode, and has the effects of improving oxygen evolution potential and prolonging the service life of the electrode;
the anode is plate-shaped or net-shaped, and the effect is to increase the contact area between the anode and sewage;
the cathode is a stainless steel electrode, and has the effect of being communicated with a power supply.
The particle electrode can adopt 100-300 mesh granular active carbon, and has the effects of improving the electrolysis efficiency, reducing the electrolysis voltage and achieving the purpose of energy conservation.
Specifically, in the hydrolytic acidification tank:
the added microorganism can be high-salt engineering bacteria, and the addition amount can be 1500-3000mg/L, so that the effect is that the biodegradability of the landfill leachate/membrane concentrate is improved by further utilizing the biological effect;
the added MBBR filler has the effects of increasing microorganism attachment points and improving hydrolysis efficiency.
Specifically, in the denitrification and decarbonization tank:
the added microorganism is high-salt engineering bacteria, and the addition amount can be 4000-8000mg/L, so that the project debugging time is shortened;
the used filler is MBBR filler, which has the effects of increasing microorganism attachment points and improving denitrification and carbon removal efficiency;
the dissolved oxygen can be controlled to be 0.5-1.5mg/l, and the effect is that conditions favorable for the growth of nitrobacteria are provided;
the pH can be controlled between 7.5 and 8.5, and the effect is that conditions favorable for the growth of nitrobacteria are provided, so that ammonia exists in an ionic state, and the inhibition of molecular free ammonia on the activity of the nitrobacteria is reduced;
the denitrification and decarbonization device is characterized in that a sedimentation tank is arranged in the denitrification and decarbonization tank, sewage subjected to synchronous short-range nitrification and denitrification treatment in the denitrification and decarbonization tank system is discharged into an MBR membrane tank after being sedimentated, and the service life of the MBR membrane is prolonged.
Specifically, in the MBR membrane tank:
the added microorganism is high-salt engineering bacteria, the addition amount can be 15000-20000mg/L, and the effect is to further treat carbon and nitrogen pollutants in the landfill leachate/membrane concentrate;
the dissolved oxygen can be controlled to be 0.5-1.5mg/l, and the effect is to provide conditions favorable for the growth of nitrobacteria.
The landfill leachate or the membrane concentrate is taken as water inlet, and the landfill leachate full-quantization treatment system provided by the utility model can be used for treatment to obtain discharged water.
Further, the scum of the coagulating sedimentation device is treated by a coagulating sedimentation solid-liquid separator to obtain resource utilization slag.
Further, the sludge in the denitrification and decarbonization tank is treated by an activated sludge dehydrator to obtain the resource utilization sludge.
The utility model has the beneficial effects that:
1. the treatment system can fully quantitatively treat garbage percolate or membrane concentrated solution, no concentrated water and crystalline salt mud are generated, only suspended matter slag and activated sludge are generated, and the mud or slag amount can be less than 3%;
2. compared with Fenton method, the electrochemical method has the advantages that the advanced oxidation process improves the biodegradability of sewage, simultaneously, sludge is not generated, the control is more convenient, the corrosiveness to equipment is low, and the phenomenon of color reversal is avoided;
3. by adopting synchronous nitrification and denitrification, the multi-stage AO denitrification method can save 40% of carbon sources, reduce 25% of oxygen supply, reduce 35% of biochemical treatment tank volume and reduce 30% of sludge;
4. the intelligent control system of the Internet of things can be conveniently and further adopted, the intelligent control system can be controlled on site or remotely, and the operation parameters can be regulated according to the water quality, so that unmanned on duty is basically realized.
Drawings
Fig. 1 is a system diagram of the full quantification treatment of landfill leachate provided by the utility model.
Detailed Description
The principles and features of the present utility model are described below with examples only to illustrate the present utility model and not to limit the scope of the present utility model.
In a specific embodiment, as shown in fig. 1, the full quantification treatment system of the landfill leachate comprises a bag filter, a coagulating sedimentation system, a coagulating sedimentation solid-liquid separator, a combined air floatation system, an electrochemical processor, a hydrolytic acidification tank, a denitrification and decarbonization tank and an MBR membrane tank which are sequentially communicated.
In one embodiment, the outlet of the coagulating sedimentation device is communicated with the mud outlet of the combined air floatation device. The sludge outlet of the denitrification and decarbonization tank is communicated with the sludge outlet of the MBR membrane tank by an activated sludge dehydrator.
The garbage percolate or film concentrate in the regulating tank is pumped into the bag filter to remove the impurities such as large suspended matters, sediment and the like. Then enters a coagulating sedimentation device, coagulant and coagulant aid are added to demulsify, and small suspended matters or colloid in the sewage are removed. And (3) feeding the clear liquid after the solid-liquid separation and dehydration into a combined air floatation device to further remove colloid suspended matters in the sewage. The sewage after suspended matters are removed enters an electrochemical processor for electrolytic treatment, after the biodegradability of the sewage is improved, the sewage flows into a hydrolysis acidification tank, macromolecular organic matters are further hydrolyzed to improve the biodegradability, then the sewage enters a denitrification and decarbonization tank, ammonia nitrogen and COD in the sewage are efficiently removed by adopting synchronous nitrification and denitrification, and then the sewage enters an MBR membrane tank for membrane passing and then is discharged after reaching the standard. Suspended matter scum generated by coagulating sedimentation and residual activated sludge generated by biochemical treatment are subjected to solid-liquid separation, the treated sewage is recycled, and the separated sewage is returned to the system to be treated and discharged after reaching standards.
Effect example 1
In a specific implementation process, the specific situations are as follows:
the water inlet is landfill leachate, and the specific indexes are as follows: CODcr:5285mg/L, BOD5:1171mg/L, ammonia nitrogen: 2114mg/L, 2643mg/L total nitrogen, conductivity 50.0ms/cm.
In the bag filter, the parameter is that a No. 1 filter bag is used, and the maximum flow rate is 15t/h.
The coagulating sedimentation device adopts a static mixer, and the parameters are as follows: the coagulant is PAC solution, and the adding amount of PAC is 2wt% of water to be treated in the mixer; the flocculant is PAM solution, and the addition amount of PAM is 0.09 weight percent of water to be treated in the mixer; pH about 6.5;
in the combined air floatation device, the parameters are as follows: the working pressure is 0.4MPa, and the reflux ratio is 50%.
In an electrochemical processor, the parameters are: the anode is a titanium-based ruthenium-iridium plated electrode plate with the thickness of 2 mm; the cathode is a stainless steel electrode; the particle electrode was used in an amount of 2.0wt% and the current density was controlled to 100A/m 2 Frequency 50HZ.
In the hydrolytic acidification tank, the parameters are as follows: the added microorganism is high-salt engineering bacteria, and the addition amount is 2000mg/L; the adding amount of the MBBR is 30v%, the hydraulic retention time is 4h, and the rising flow rate in the tank is 1.2m/h.
In the denitrification and decarbonization tank, the parameters are as follows: the added microorganism is high-salt engineering bacteria, and the addition amount is 6500mg/L; adding MBBR filler with the addition amount of 40% by volume; dissolved oxygen is controlled at about 0.8mg/l; the pH is controlled to be about 8.0; the carbon source is glucose, and the addition amount is 5.51 kg/ton of water.
In the MBR membrane tank, parameters are as follows: the added microorganism is high-salt engineering bacteria, and the addition amount is 18000mg/L; dissolved oxygen was controlled at about 0.8mg/l.
The concrete indexes of the resource utilization slag obtained by the coagulating sedimentation solid-liquid separator are as follows: the water content is less than 75%.
The specific indexes of the resource utilization slag obtained by the activated sludge dehydrator are as follows: the water content is less than 80%.
Specific indexes of the water discharged after reaching the standard are as follows: CODcr:55.1mg/L, BOD5:15.3mg/L, ammonia nitrogen: 3.04mg/L and 11.5mg/L of total nitrogen.
Effect example 2
In a specific implementation process, the specific situations are as follows:
the water inlet is membrane concentrated solution, and the specific indexes are as follows: CODcr:5680mg/L, BOD5:2365mg/L, ammonia nitrogen: 4580mg/L, total nitrogen 5790mg/L, conductivity 62.4ms/cm.
In the bag filter, the parameter is that a No. 1 filter bag is used, and the maximum flow rate is 15t/h.
The coagulating sedimentation device adopts a static mixer, and the parameters are as follows: the coagulant is PAC solution, and the adding amount of PAC is 1.2 weight percent of water to be treated in the mixer; the flocculant is PAM solution, and the addition amount of PAM is 0.05wt% of water to be treated in the mixer; ph is about 6;
in the combined air floatation device, the parameters are as follows: the working pressure is 0.4MPa, and the reflux ratio is 50%.
In an electrochemical processor, the parameters are: the anode is a titanium-based ruthenium-iridium plated electrode net with the thickness of 2 mm; the cathode is a stainless steel electrode; the particle electrode was used in an amount of 1.5wt% and the current density was controlled to 100A/m 2 Frequency 50HZ.
In the hydrolytic acidification tank, the parameters are as follows: the added microorganism is high-salt engineering bacteria, and the addition amount is 2000mg/L; the adding amount of the MBBR filler is 30v%, the hydraulic retention time is 4h, and the rising flow rate in the tank is 1.0m/h
In the denitrification and decarbonization tank, the parameters are as follows: the added microorganism is high-salt engineering bacteria, and the addition amount is 8000mg/L; adding MBBR filler with the addition amount of 45% by volume; dissolved oxygen is controlled at about 0.8mg/l; the pH is controlled to be about 8.0; the carbon source is methanol and glucose, and the addition amount is 8 kg/ton of water and 5 kg/ton of water in sequence.
In the MBR membrane tank, parameters are as follows: the added microorganism is high-salt engineering bacteria, and the addition amount is 18000mg/L; dissolved oxygen was controlled at about 0.8mg/l.
The concrete indexes of the resource utilization slag obtained by the coagulating sedimentation solid-liquid separator are as follows: the slag content is 1.2wt% and the water content is less than 75%.
The specific indexes of the resource utilization slag obtained by the activated sludge dehydrator are as follows: the mud content is 0.8wt% and the water content is less than 80%.
Specific indexes of the water discharged after reaching the standard are as follows: CODcr:53.2mg/L, BOD5:13.5mg/L, ammonia nitrogen: 2.6mg/L and 9.5mg/L total nitrogen.
Comparative example 1
Reference effect example 2, the treatment of the inflow water with similar index except PAC addition amount was adjusted to 1.1wt%, the other are the same as it, the result is:
the concrete indexes of the resource utilization slag obtained by the coagulating sedimentation solid-liquid separator are as follows: the slag content is 1.1wt% and the water content is less than 75%.
The specific indexes of the resource utilization slag obtained by the activated sludge dehydrator are as follows: the mud content is 0.8wt% and the water content is less than 80%.
Specific indexes of the water discharged after reaching the standard are as follows: CODcr:55.6mg/L, BOD5:16.3mg/L, ammonia nitrogen: 2.5mg/L and 9.3mg/L total nitrogen.
The change of PAC addition amount can reduce the slag amount of the coagulating sedimentation solid-liquid separator, and the effluent can still reach the standard for discharge, so that the system has impact load resistance.
Comparative example 2
Reference effect example 2, treatment of influent water of the same index was performed with a current removal density controlled to 50A/m 2 All others are the same, and the results obtained are:
the concrete indexes of the resource utilization slag obtained by the coagulating sedimentation solid-liquid separator are as follows: the slag content is 1.2wt% and the water content is less than 75%.
The specific indexes of the resource utilization slag obtained by the activated sludge dehydrator are as follows: the mud content is 1.0wt% and the water content is less than 80%.
Specific indexes of the water discharged after reaching the standard are as follows: CODcr:89.5mg/L, BOD5:13.5mg/L, ammonia nitrogen: 1.5mg/L and 7.6mg/L total nitrogen.
It can be seen that the change of the current condition of the electrochemical device leads to an increase of the content of non-biodegradable organic matters in the sewage, so that the content of CODcr of the effluent is high. Current is one of the important parameters affecting the system in treating landfill leachate/membrane concentrate.
The foregoing description of the preferred embodiments of the utility model is not intended to limit the utility model to the precise form disclosed, and any such modifications, equivalents, and alternatives falling within the spirit and scope of the utility model are intended to be included within the scope of the utility model.
Claims (6)
1. The full quantification treatment system for the landfill leachate is characterized by comprising a bag filter, a coagulating sedimentation device, a coagulating sedimentation solid-liquid separator, a combined air floatation device, an electrochemical processor, a hydrolysis acidification tank, a denitrification and decarbonization tank and an MBR membrane tank which are sequentially communicated.
2. The system for full-scale treatment of landfill leachate according to claim 1, wherein: and a mud outlet of the combined air floatation device is communicated with a coagulating sedimentation solid-liquid separator.
3. The system for full-scale treatment of landfill leachate according to claim 1, wherein:
the sludge outlet of the denitrification and decarbonization tank is communicated with an activated sludge dehydrator;
and/or a mud outlet of the MBR membrane tank is communicated with an activated sludge dehydrator;
and a liquid outlet of the activated sludge dewatering machine is communicated with the denitrification and decarbonization tank.
4. The system for full-scale treatment of landfill leachate according to claim 1, wherein: the coagulating sedimentation device is a static mixer.
5. The system for full quantification of landfill leachate according to claim 1, wherein the electrochemical processor is:
the anode is a titanium-based ruthenium-iridium plating electrode or a titanium-based lead oxide plating electrode; the anode is plate-shaped or net-shaped; the thickness of the anode is between 1.5 and 8 mm;
the cathode is a stainless steel electrode.
6. The system for full-scale treatment of landfill leachate according to claim 1, wherein in the denitrification and decarbonization tank: a sedimentation tank is arranged in the denitrification and decarbonization tank.
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