CN115448538A - Comprehensive treatment method for landfill leachate and kitchen waste water - Google Patents
Comprehensive treatment method for landfill leachate and kitchen waste water Download PDFInfo
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- CN115448538A CN115448538A CN202211149995.9A CN202211149995A CN115448538A CN 115448538 A CN115448538 A CN 115448538A CN 202211149995 A CN202211149995 A CN 202211149995A CN 115448538 A CN115448538 A CN 115448538A
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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- C02F9/00—Multistage treatment of water, waste water or sewage
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- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
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- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
- C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
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- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
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- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
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- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/02—Aerobic processes
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- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/28—Anaerobic digestion processes
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- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/34—Biological treatment of water, waste water, or sewage characterised by the microorganisms used
Abstract
The invention relates to a comprehensive treatment method of landfill leachate and kitchen waste water, which comprises the following steps: s1: homogenizing and adjusting the landfill leachate and the kitchen waste water, inputting the garbage leachate and the kitchen waste water into a BBR (barium Broth-Barre) treatment unit for biochemical treatment, and degrading organic matters in the waste water by using bacillus to obtain primary treatment waste water; s2: inputting the primary treatment wastewater into a BDD treatment unit, and sequentially performing primary flocculation treatment, primary electrolysis treatment, secondary electrolysis treatment and secondary flocculation treatment to treat refractory organic matters and organic nitrogen to obtain secondary treatment wastewater; s3: and inputting the secondary treatment wastewater into a BBAF treatment unit, and treating nitrate nitrogen and residual organic matters in the secondary treatment wastewater to obtain produced water through anaerobic treatment, aerobic treatment and biochemical treatment of bacillus in sequence.
Description
Technical Field
The invention belongs to the technical field of wastewater treatment, and particularly relates to a comprehensive treatment method of garbage leachate and kitchen waste water.
Background
In the process of garbage treatment and disposal, a large amount of garbage leachate is generated in garbage landfills and garbage incineration plants, and the chemical oxygen demand, the biochemical oxygen demand, the total nitrogen and the total phosphorus of the garbage leachate are relatively high. In addition, high-concentration organic wastewater is generated in the treatment process of kitchen waste and kitchen waste, anaerobic digestion treatment is usually adopted, and the treated wastewater has the characteristics of high organic matter concentration, high total nitrogen, high suspended matter and the like. The two types of wastewater have similar characteristics of high concentration of pollutants, poor biodegradability and difficult degradation, the pollutants in the wastewater are difficult to completely remove by adopting common biochemical treatment and advanced treatment measures, and the wastewater discharged into the nature can not only seriously harm the human health, but also cause eutrophication of a water body. With the stricter and stricter wastewater discharge standards, the treatment requirements on landfill leachate and kitchen waste water are higher and higher.
At present, the landfill leachate and kitchen waste water are treated by biochemical treatment combined with advanced treatment, most pollutants are removed by the biochemical treatment, and organic matters, total nitrogen and total phosphorus are further removed by the advanced treatment. Wherein, the biochemical process mainly adopts an anoxic-aerobic-MBR treatment process, and the advanced treatment mainly adopts membrane separation technologies such as nanofiltration, reverse osmosis and the like. The MBR process has high construction cost, high energy consumption, complex operation management and poor stability; the membrane separation process is a physical separation effect, pollutants are not degraded and only transferred into the concentrated solution, and the produced concentrated solution has high salinity, high concentration of organic matters difficult to degrade, high treatment difficulty and high treatment cost.
In addition, a Fenton advanced oxidation and Biological Aerated Filter (BAF) combined advanced treatment process can be adopted, the technology has high degradation degree on pollutants, does not generate concentrated solution, and has obvious advantages. Wherein, the Fenton technology adopts Fe (II) ions and H 2 O 2 The formed Fenton reagent generates hydroxyl free radicals with strong oxidation capacity under the acidic condition with low pH value, oxidizes organic pollutants in the wastewater and realizes the degradation removal of the pollutants. Because the alkalinity of the landfill leachate is very high, a large amount of strong acid is needed to be added to adjust the pH value for advanced oxidation, alkali is needed to be added after the reaction is finished to adjust the pH value to be neutral, and Fe (OH) is generated at the same time 3 The sludge is chemically precipitated to form secondary pollution, and the salinity in the water is increased. Because the landfill leachate and the kitchen waste water contain carbonate and other free radical scavengers, the utilization efficiency of hydroxyl free radicals is reduced, and side reactions are obvious. The above problems seriously affect the applicability of this technology. How to realize high-efficiency, low-cost and clean removal of refractory organic matters is the key and difficult point of the current research.
Disclosure of Invention
Aiming at the problems, the invention provides a comprehensive treatment method of garbage leachate and kitchen waste water, which adopts a BBR-BDD-BBAF combined process to carry out treatment, firstly removes most organic matters, total nitrogen, total phosphorus and other pollutants in the waste water through a BBR biochemical treatment process, and has the characteristics of high pollutant degradation degree and stable treatment effect; then, continuously treating the remaining refractory organics in the wastewater by adopting an electro-oxidation technology (BDD), continuously decomposing the refractory organics, and simultaneously converting organic nitrogen into nitrate nitrogen; then, the BBAF unit consists of an anaerobic tank (denitrification biological filter) and an aerobic tank (nitrification aeration biological filter), nitrate nitrogen and residual organic matters in BDD effluent are respectively removed, biological fillers attached with bacillus are added into the aerobic tank, and produced water can reach the discharge standard limit values of the second and third tables in GB 16889.
The comprehensive treatment method of the landfill leachate and the kitchen waste water comprises the following steps:
s1: homogenizing and adjusting the landfill leachate and the kitchen waste water, inputting the garbage leachate and the kitchen waste water into a BBR (barium Broth-Barre) treatment unit for biochemical treatment, and degrading organic matters in the waste water by using bacillus to obtain primary treatment waste water;
s2: inputting the primary treatment wastewater into a BDD treatment unit, and sequentially performing primary flocculation treatment, primary electrolysis treatment, secondary electrolysis treatment and secondary flocculation treatment to treat refractory organic matters and organic nitrogen to obtain secondary treatment wastewater;
s3: and inputting the secondary treatment wastewater into a BBAF treatment unit, and treating nitrate nitrogen and residual organic matters in the secondary treatment wastewater to obtain produced water through anaerobic treatment, aerobic treatment and biochemical treatment of bacillus in sequence.
Optionally, in step S1, the landfill leachate and the kitchen waste water are first input into an adjusting tank for homogeneous adjustment, and then input into a BBR processing unit for biochemical processing, where the BBR processing unit includes a waste water biochemical processing tank and a plurality of circular biological rotating disk devices in the waste water biochemical processing tank, the biological rotating disk is used as a biological carrier for attaching and proliferating a large number of bacillus, and the waste water biochemical processing tank is used for accommodating and processing the landfill leachate and the kitchen waste water; one part of the biological rotating disc is immersed in the garbage percolate and the kitchen waste water, the other part of the biological rotating disc is exposed in the air, a rotating shaft is arranged at the center of the biological rotating disc, and the biological rotating disc is alternately positioned in the waste water and the air under the rotating action of the rotating shaft. The BBR treatment unit can adopt a patent number 2021219913445 and is named as a plug-in mounting type three-dimensional biological rotating disc sewage treatment device.
The enhanced action of the BBR bacillus and the low dissolved oxygen control in the biochemical aeration tank ensure that partial nitrite accumulation occurs in the nitrification process of ammonia nitrogen in garbage percolate and kitchen waste water, partial short-range nitrification and denitrification process exists in the total nitrogen removal process, the carbon source demand in the denitrification process is reduced, the BBR biological rotating disc is added to efficiently hydrolyze refractory organic matters, the utilization rate of raw water carbon source is improved, and the high-efficiency removal of TN under the condition of low BOD/TN is realized; the pollutant concentration in landfill leachate and kitchen waste water is high, a lot of heat can be released in the treatment process, especially in southern areas in summer, the water temperature can rise to more than 40 ℃, the A/O-MBR process usually needs to be matched with a high-power cooling device in a treatment facility to effectively control the water temperature, and a large amount of electric energy needs to be consumed.
Optionally, in step S2, the BDD treatment unit includes a first-stage flocculation tank, a first-stage electrolytic tank, a second-stage electrolytic tank, a circulation tank, and a second-stage flocculation tank, which are connected in sequence, an outlet of the biochemical wastewater treatment tank of the BBR treatment unit is connected to an inlet of the first-stage flocculation tank, an outlet of the first-stage flocculation tank is connected to an external circulation inlet of the circulation tank, an internal circulation outlet of the circulation tank is connected to an inlet of the first-stage electrolytic tank through a circulation pump, and wastewater from the first-stage flocculation tank is introduced into the first-stage electrolytic tank; the outlet of the first-stage electrolytic cell is connected with the inlet of the second-stage electrolytic cell, the outlet of the second-stage electrolytic cell is connected with the internal circulation inlet of the circulation cell, and the wastewater returns to the circulation cell after first-stage electrolysis and second-stage electrolysis; the outer circulation outlet of the circulation tank is connected with the inlet of the secondary flocculation tank, and the outlet of the secondary flocculation tank is connected with the BBAF treatment unit.
Optionally, a water quality detector is arranged in the circulation tank, when the index of the wastewater in the circulation tank is unqualified, the wastewater returns to the first-stage electrolytic tank through the internal circulation outlet, is subjected to two-stage electrolytic treatment again, and then returns to the circulation tank; when the wastewater index of the circulating tank is qualified, the wastewater enters a secondary flocculation tank through an external circulation outlet to carry out secondary flocculation treatment. The circulating electrolysis mode effectively ensures the water quality of the two-stage electrolysis treatment, and can also deal with and ensure the water quality of the secondary treatment wastewater even in the case of large water quality fluctuation of the garbage percolate and the kitchen waste wastewater.
Optionally, a negative pressure induced draft device is arranged at the top of the circulation tank, and the negative pressure induced draft device comprises a negative pressure induced draft fan and an induced draft pipeline and is used for discharging odor in the circulation tank; the induced draft pipeline is connected with an external spray tower, and the spray tower absorbs gas exhausted from the induced draft pipeline through spraying chemicals.
Further optionally, the first-stage electrolytic cell is provided with a graphene cathode and anode, and the second-stage electrolytic cell is provided with a boron-doped diamond cathode and anode. Compared with a common graphite electrode or a noble metal electrode, the graphene electrode and the boron-doped diamond electrode have stronger oxidation capacity, higher anodic oxygen evolution potential, lower anodic resistance, higher chemical stability and pollution resistance.
Optionally, the BDD treatment unit further comprises a flocculant adding device and a deoxidant adding device, the flocculant adding device is respectively connected with the primary flocculation tank and the secondary flocculation tank through two parallel pipelines, a flocculant metering pump is respectively arranged on the two parallel pipelines, pH sensors are respectively arranged below the liquid surfaces of the primary flocculation tank and the secondary flocculation tank and used for monitoring the pH values of water bodies in the two flocculation tanks, and the flocculant adding device judges the flocculant dosage required by each flocculation tank according to the pH value and adds the flocculant through the flocculant metering pump;
the oxygen scavenger feeding device is connected with the secondary flocculation tank through an oxygen scavenger metering pump, an ORP sensor is arranged below the liquid level of the secondary flocculation tank and used for monitoring the oxidation-reduction potential of the water body of the secondary flocculation tank, the oxygen scavenger feeding device judges the oxygen scavenging amount to be fed according to the numerical value of the oxidation-reduction potential, and quantitatively feeds the oxygen scavenger into the secondary flocculation tank through the oxygen scavenger metering pump, so that chlorine generated by a front-end electrolysis process in water is removed, and excessive chlorine in secondary treatment wastewater is prevented from entering a BBAF treatment unit to kill fungi of the BBAF treatment unit.
The flocculant and the deoxidant are both commonly used in the water treatment industry. Preferably, the oxygen scavenger comprises a reducing agent and an auxiliary agent, wherein the reducing agent is selected from a combination of two or more of sodium sulfide, calcium polysulfide and mercaptan, and the auxiliary agent is selected from a combination of two or more of soluble starch, sodium lignosulfonate and sodium divinyl sulfonate.
Optionally, in step S3, the BBAF treatment unit includes an anaerobic tank and an aerobic tank which are connected in sequence, a water body of the aerobic tank can flow back to the anaerobic tank, and the aerobic tank is provided with a biological filler attached with bacillus, so that denitrification efficiency can be greatly improved; the aerobic tank is provided with a backwashing water outlet which is connected with a drain pipe and a return pipe in parallel, the drain pipe discharges produced water or leads in backwashing water to wash the BBAF treatment unit, the return pipe is connected with the regulating tank, part of produced water flows back to the regulating tank, and raw water landfill leachate and kitchen waste water are diluted.
Optionally, biological fillers are arranged in both the anaerobic tank and the aerobic tank, and the biological fillers can be conventional BAF fillers, such as inorganic fillers or high-molecular fillers, such as light-weight ceramsite, activated carbon, and the like. The biological filler in the anaerobic tank is attached with conventional anaerobic water treatment bacteria and anaerobic bacillus, and the biological filler in the aerobic tank is attached with conventional aerobic water treatment bacteria and bacillus. And adding a carbon source into the anaerobic tank according to the actual wastewater treatment condition, and selecting the carbon source commonly used in the field.
The anaerobic pool and the aerobic pool are started by the conventional technology in the field, namely, inoculation culture and biofilm formation are adopted, and a certain amount of compound strains containing bacillus and nutrient solution are continuously added into inlet water.
The steps S2 and S3 of the invention are advanced treatment stages, the BDD electrooxidation and the BBAF process are creatively adopted to be combined in the advanced treatment stages, and the BDD electrooxidation device (two-stage electrolytic cell) is utilized to decompose the refractory organic matters in the wastewater treated at one time into micromolecular organic matters or CO through the dual functions of electrode oxidation and advanced oxidation 2 、H 2 And O, oxidizing the residual organic nitrogen and ammonia nitrogen into nitrate nitrogen. And (3) allowing the secondary treatment wastewater to enter a BBAF treatment unit, performing denitrification and denitrification on the secondary treatment wastewater on the basis of a micromolecular carbon source and an added carbon source through anaerobic and aerobic actions and biochemical actions of bacillus, and finally discharging the effluent after reaching the discharge standard.
According to the BDD + BBAF advanced treatment process, pollutants in primary treatment wastewater are decomposed and removed more thoroughly, harmlessness of the pollutants is realized, no concentrated solution is generated, and full-scale up-to-standard discharge of the wastewater is realized; in the electro-oxidation process of the BDD processing unit, except the oxidation capacity of the anode, oxidizing free radicals such as OH free radicals and the like can be generated at the cathode, and the oxidation efficiency of the BDD processing unit on refractory organic matters is higher under the combined action; meanwhile, the BDD treatment unit mainly utilizes electric energy, salt content in the wastewater cannot be increased, and the defects of Fenton reagent and acid-base regulation in the traditional Fenton and BAF combined process in the background art are overcome. The BDD processing unit is in the waste water treatment process, according to the actual pollution condition of waste water, the voltage and the current parameter of the electrode of two electrolysis ponds of control can, the flexible operation is convenient, the operation and maintenance management of being convenient for.
Optionally, the bottoms of the first-stage flocculation tank and the second-stage flocculation tank are respectively provided with a sludge outlet, the two sludge outlets are both connected with a sludge tank, the bottoms of the anaerobic tank and the aerobic tank are respectively provided with a sludge discharge outlet, and the two sludge discharge outlets are both connected with the sludge tank; a sludge outlet of the sludge tank is connected with a filter pressing device, the upper part of the sludge tank is provided with a supernatant liquid outlet and is connected with the regulating tank, and the sludge outlet of the filter pressing device discharges filter-pressed sludge;
step S2, sludge generated by the primary flocculation tank and the secondary flocculation tank is input into a sludge tank, sludge collected by the sludge tank is intensively input into a filter pressing device for filter pressing dehydration treatment, sludge reduction is realized, and treated sludge is discharged and then transported outside for treatment or reuse;
and the step S3 also comprises the step of inputting the sludge generated by the anaerobic tank and the aerobic tank into a sludge tank, and the sludge collected by the sludge tank is intensively input into a filter pressing device for filter pressing dehydration treatment.
Both step S2 and step S3 comprise the steps of: and returning supernatant in the sludge tank to the regulating tank, and diluting and regulating raw water landfill leachate and kitchen waste water.
Optionally, the primary flocculation tank comprises a filtering area in the middle and flocculation areas around the filtering area, the filtering area and the flocculation areas are separated by a partition plate, and a space is formed between the bottom of the partition plate and the bottom of the primary flocculation tank to form a circle of water passing openings, so that the filtering area and the flocculation areas are communicated at the bottom of the primary flocculation tank, and water in the flocculation areas is allowed to enter the filtering area;
the flocculation area is uniformly divided into a plurality of stirring areas, namely the stirring areas are distributed in the circumferential direction around the filtering area, and no separation device is arranged between the adjacent stirring areas, namely the adjacent stirring areas are communicated with each other; a stirrer is arranged in the center of each stirring area, and each stirring area is provided with a flocculating agent adding port and a stirring area water inlet;
the bottom of filtering area is equipped with the sand filtration layer, and the top of sand filtration layer is equipped with the swash plate disengagement zone, and the swash plate disengagement zone includes a plurality of inclined, the swash plate that is parallel to each other, and the top of swash plate disengagement zone is equipped with the export of one-level flocculation basin.
Optionally, the stirring area water inlet is arranged at the upper part of the stirring area, and is arranged around the circumference of the primary flocculation tank relative to the stirring area water inlet, each stirring area water inlet is connected in parallel and then connected with the outlet of the wastewater biochemical treatment tank of the BBR treatment unit, and the primary treatment wastewater is input into the corresponding stirring area through a plurality of stirring area water inlets.
Optionally, the flocculant adding ports are arranged on the upper portion of the stirring area, the pH sensors are arranged on the middle upper portion of the flocculation area, the flocculant adding ports of each stirring area are connected in parallel and then connected with the flocculant adding device through the flocculant metering pump, the flocculant metering pump controls the adding amount of the flocculant according to monitoring data of the pH sensors, and then the flocculant is added into the corresponding stirring area through the plurality of flocculant adding ports to treat primary treatment wastewater.
Optionally, the side wall of the bottom of the primary flocculation tank is in a cone shape which is inclined inwards, and the bottom of the partition is in a cone shape which is inclined outwards, namely the bottom of the flocculation area is in a cone shape which is gradually narrowed, so that sludge generated by flocculation reaction can be collected conveniently;
every stirring district bottom is equipped with a mud outlet, discharges the mud in each stirring district respectively, perhaps flocculation district bottom is equipped with a mud outlet, the mud in each stirring district of unified discharge, mud outlet connection sludge impoundment.
Optionally, the water outlet is provided with a filter screen, and the aperture of the mesh of the filter screen is smaller than the sand filtering particle size of the sand filtering layer, so that the filter sand is prevented from entering the flocculation area and being lost from the mud outlet; the bottom of the primary flocculation tank is provided with a sand discharge port.
The primary treatment wastewater passes through the filter screen from the water passing port to enter the bottom of the filter area after being treated by the flocculation area, passes through the sand filter layer from bottom to top, is filtered by the sand filter layer, then rises to the inclined plate separation area, continues mud-water separation, sludge slides down to the sand filter layer by the inclined plate, clear water is discharged to the circulation tank from the outlet of the primary flocculation tank, and the outlet of the primary flocculation tank sequentially penetrates through the partition plate, the flocculation area and the side wall of the primary flocculation tank; because the bottom filtering sand of the sand filtering layer firstly receives wastewater pollutants, the bottom filtering sand needs to be replaced firstly, is discharged from the sand discharge port, is washed and cleaned outside, and fresh filtering sand or cleaned filtering sand is added from the top of the filtering area.
Optionally, the structure of the secondary flocculation tank is the same as that of the primary flocculation tank, and the difference is that after being connected in parallel, each stirring area water inlet of the secondary flocculation tank is connected with an external circulation outlet of the circulation tank, and qualified wastewater in the circulation tank is input into the corresponding stirring area through a plurality of stirring area water inlets; the flocculant metering pump connected with the flocculant adding port of the secondary flocculation tank is not the same as the flocculant metering pump connected with the primary flocculation tank; the outlet of the second-stage flocculation tank sequentially penetrates through the partition board of the second-stage flocculation tank, the flocculation area and the side wall of the second-stage flocculation tank and is connected with the anaerobic tank.
The primary flocculation tank and the secondary flocculation tank are integrated with flocculation and filtration and communicated through the water passing port, so that the flow directions of water bodies in the flocculation area from top to bottom and the flow directions of water bodies in the filtration area from bottom to top are realized, the space of the flocculation tank is fully utilized, the flocculation efficiency is improved, the effluent quality of the flocculation tank is optimized, and the subsequent treatment environment is facilitated.
Drawings
FIG. 1 is a process flow diagram of example 1;
FIG. 2 is a schematic view of the apparatus of example 1;
FIG. 3 is a schematic view of the connection of the electrolysis portion of BDD;
FIG. 4 is a schematic perspective view of the primary flocculation tank of example 3;
FIG. 5 is a top view of the primary flocculation tank;
fig. 6 is a cross-sectional view of a primary flocculation tank.
In the attached drawing, 1-a regulating tank, 2-a BBR treatment unit, 3-a first-stage flocculation tank, 4-a first-stage electrolysis tank, 5-a second-stage electrolysis tank, 6-a circulation tank, 7-a second-stage flocculation tank, 8-an external circulation inlet, 9-an internal circulation outlet, 10-an internal circulation inlet, 11-an external circulation outlet, 12-a negative pressure induced air device, 13-a flocculating agent adding device, 14-a deoxidizing agent adding device, 15-a flocculating agent metering pump, 16-a deoxidizing agent metering pump, 17-an anaerobic tank, 18-an aerobic tank, 19-a sludge tank, 20-a filter pressing device, 21-a filtering zone, 22-a flocculation zone, 23-a partition plate, 24-a water passing port, 25-a stirring zone, 26-a sand filtering layer, 27-a separation zone, 28-a stirring zone water inlet, 29-a sand discharging port and 30-a circulation pump are arranged.
Detailed Description
The landfill leachate and kitchen waste water treated by the following examples and comparative examples are both from certain municipal refuse treatment plants and municipal sewage plants, the treatment capacity is 50t/d, and the water quality of the landfill leachate and the kitchen waste water after homogeneous regulation is as follows:
| COD Cr (mg/L) | NH 3 -N(mg/L) | TN(mg/L) | |
| inflow water | 7354 | 1958 | 2472 |
Example 1
The comprehensive treatment method of landfill leachate and kitchen waste water, as shown in fig. 1-3, includes the following steps:
(1) Inputting garbage percolate and kitchen waste water into an adjusting tank 1, performing homogeneous adjustment, inputting the garbage percolate and the kitchen waste water into a BBR (barium boron reactor) processing unit 2 for biochemical treatment, and degrading organic matters in the waste water by using bacillus to obtain primary treatment waste water;
the BBR treatment unit 2 comprises a wastewater biochemical treatment pool and a plurality of circular biological rotating discs in the wastewater biochemical treatment pool, the biological rotating discs are used as biological carriers to attach and proliferate a large number of bacilli, and the wastewater biochemical treatment pool is used for accommodating and treating landfill leachate and kitchen waste water; one part of the biological rotating disc is immersed in the garbage percolate and the kitchen waste water, the other part of the biological rotating disc is exposed in the air, a rotating shaft is arranged at the center of the biological rotating disc, and the biological rotating disc is alternately positioned in the waste water and the air under the rotating action of the rotating shaft;
the BBR treatment unit 2 of the embodiment can adopt a plug-in mounting type three-dimensional biological rotating disk sewage treatment device with patent number 2021219913445, and the surface area of a single biological rotating disk is 750m 2 The power is 2.2kW, the film forming amount is 3.5-4.5 t/station, 4 stations are arranged in total, and 500kg of Qinghai Jieshen BBR composite bacillus strain is inoculated in total; the hydraulic retention time of the wastewater biochemical treatment tank is 7 days, the gas-water ratio is 110-170, and the reflux ratio is 100%;
(2) Inputting the primary treatment wastewater into a BDD treatment unit, and sequentially performing primary flocculation treatment, primary electrolysis treatment, secondary electrolysis treatment and secondary flocculation treatment to treat refractory organic matters and organic nitrogen to obtain secondary treatment wastewater;
(3) And inputting the secondary treatment wastewater into a BBAF treatment unit, and treating nitrate nitrogen and residual organic matters in the secondary treatment wastewater to obtain produced water through anaerobic treatment, aerobic treatment and biochemical treatment of bacillus in sequence.
In the step S2, the BDD treatment unit comprises a primary flocculation tank 3, a primary electrolytic tank 4, a secondary electrolytic tank 5, a circulating tank 6 and a secondary flocculation tank 7 which are connected in sequence, wherein the five tank bodies are common tank bodies, and are all single-chamber tank bodies without any blocking structures.
An outlet of a wastewater biochemical treatment tank of the BBR treatment unit 2 is connected with an inlet of a primary flocculation tank 3, an outlet of the primary flocculation tank 3 is connected with an external circulation inlet 8 of a circulation tank 6, an internal circulation outlet 9 of the circulation tank 6 is connected with an inlet of a primary electrolytic tank 4 through a circulation pump 30, and wastewater from the primary flocculation tank 3 is led into the primary electrolytic tank 4; the outlet of the first-stage electrolytic cell 4 is connected with the inlet of the second-stage electrolytic cell 5, the outlet of the second-stage electrolytic cell 5 is connected with the internal circulation inlet 10 of the circulation pool 6, and the wastewater returns to the circulation pool 6 after first-stage electrolysis and second-stage electrolysis; an external circulation outlet 11 of the circulation tank 6 is connected with an inlet of the secondary flocculation tank 7, and an outlet of the secondary flocculation tank 7 is connected with the BBAF treatment unit.
A water quality detector is arranged in the circulating tank 6, when the index of the wastewater in the circulating tank 6 is unqualified, the wastewater returns to the first-stage electrolytic tank 4 through the internal circulation outlet 9, is subjected to two-stage electrolytic treatment again, and then returns to the circulating tank 6; when the wastewater index of the circulating tank 6 is qualified, the wastewater enters the secondary flocculation tank 7 through the external circulating outlet 11 to be subjected to secondary flocculation treatment.
The top of the circulating pool 6 is provided with a negative pressure induced draft device 12, and the negative pressure induced draft device 12 comprises a negative pressure induced draft fan and an induced draft pipeline and is used for discharging odor in the circulating pool 6; the induced draft pipeline is connected with an external spray tower, and the spray tower absorbs gas exhausted from the induced draft pipeline through spraying chemicals.
The first-stage electrolytic cell 4 is provided with a graphene electrode, and the second-stage electrolytic cell 5 is provided with a boron-doped diamond cathode and anode electrode.
The BDD treatment unit further comprises a flocculating agent adding device 13 and a deoxidizing agent adding device 14, wherein the flocculating agent adding device 13 is respectively connected with the primary flocculation tank 3 and the secondary flocculation tank 7 through two parallel pipelines, a flocculating agent metering pump 15 is respectively arranged on the two parallel pipelines, pH sensors are respectively arranged below the liquid surfaces of the primary flocculation tank 3 and the secondary flocculation tank 7 and used for monitoring the pH value of water in the two flocculation tanks, and the flocculating agent adding device 13 judges the flocculating agent dosage required by each flocculation tank according to the pH value and adds the flocculating agent dosage through the flocculating agent metering pump 15;
the oxygen scavenger adding device 14 is connected with the secondary flocculation tank 7 through an oxygen scavenger metering pump 16, an ORP sensor is arranged below the liquid level of the secondary flocculation tank 7 and used for monitoring the oxidation-reduction potential of the water body of the secondary flocculation tank 7, the oxygen scavenger adding device 14 judges the amount of oxygen to be added according to the numerical value of the oxidation-reduction potential, and the oxygen scavenger is quantitatively added into the secondary flocculation tank 7 through the oxygen scavenger metering pump 16.
The flocculant is polyaluminium chloride. The deoxidant is the combination of soluble starch, sodium lignosulfonate, sodium sulfide and dodecyl mercaptan.
The process conditions of the step S2 are as follows: the hydraulic retention time of the primary flocculation tank 3 is 1h, and the addition amount of the flocculating agent is 250mg added into 1L of wastewater; the areas of the positive and negative electrode plates of the first-stage electrolytic cell 4 are both 8m 2 Current density 400A/m 2 (ii) a The areas of the positive and negative electrode plates of the secondary electrolytic cell 5 are both 0.5m 2 Current density 800A/m 2 (ii) a The hydraulic retention time of the secondary flocculation tank 7 is 1h, the dosage of the flocculating agent is 100mg added into 1L of wastewater, and the dosage of the deoxidant is 70mg added into 1L of wastewater.
In the step S3, the BBAF treatment unit comprises an anaerobic tank 17 and an aerobic tank 18 which are connected in sequence, the water body of the aerobic tank 18 can flow back to the anaerobic tank 17, and the aerobic tank 18 is provided with biological filler attached with bacillus, so that the denitrification efficiency can be greatly improved; the upper part of the aerobic tank 18 is provided with a backwashing water outlet which is connected with a drain pipe and a return pipe in parallel, the drain pipe discharges produced water or leads the backwashing water to wash the BBAF treatment unit, the return pipe is connected with the regulating tank 1 and the wastewater biochemical treatment tank, and part of the produced water flows back to the regulating tank 1 or the wastewater biochemical treatment tank.
Biological fillers are arranged in the anaerobic tank 17 and the aerobic tank 18, the biological fillers are spherical ceramic particles, the biological fillers in the anaerobic tank are attached with conventional anaerobic water treatment bacteria and anaerobic bacillus, and the biological fillers in the aerobic tank are attached with conventional aerobic water treatment bacteria and bacillus. And adding a carbon source glucose into the anaerobic tank 17 according to the actual wastewater treatment condition. When the system is started, the anaerobic tank 17 and the aerobic tank 18 both adopt a method of inoculation culture, biofilm formation and continuous feeding of a certain amount of composite strains containing bacillus and nutrient solution into inlet water.
The process conditions of the step S3 are as follows: surface hydraulic negative of the anaerobic tank 17The load is 2.6m 3 /m 2 H (without reflux) NOx load of 0.75kgNO 3 -N/m 3 D, hydraulic load on the surface of the aerobic tank 18 is 2.6m 3 /m 2 H, inoculating 200kg of composite aerobic bacteria and BBR composite bacillus strain in the Qinghai Jieshen in the aerobic pool 18, and inoculating BBAF composite anaerobic bacteria in the Qinghai Jieshen in the anaerobic pool 17; the water backwashing strength of the two pools is 16m 3 /(m 2 H), 250000mg/L of COD equivalent of the glucose carbon source in the anaerobic tank 17, and the adding concentration is 80-150L/d.
The bottoms of the primary flocculation tank 3 and the secondary flocculation tank 7 are respectively provided with a sludge outlet, the two sludge outlets are both connected with a sludge tank 19, the bottoms of the anaerobic tank 17 and the aerobic tank 18 are respectively provided with a sludge discharge outlet, and the two sludge discharge outlets are both connected with the sludge tank 19; a sludge outlet of the sludge tank 19 is connected with a filter pressing device 20, a supernatant liquid outlet is arranged at the upper part of the sludge tank 19 and is connected with the adjusting tank 1, and sludge after filter pressing is discharged from a sludge outlet of the filter pressing device 20.
The step S2 also comprises the steps that the sludge generated by the primary flocculation tank 3 and the secondary flocculation tank 7 is input into a sludge tank 19, the sludge collected by the sludge tank 19 is intensively input into a filter pressing device 20 for filter pressing dehydration treatment, so that the sludge reduction is realized, and the treated sludge is discharged and then transported outside for treatment or recycling;
the step S3 also comprises that the sludge generated by the anaerobic tank 17 and the aerobic tank 18 is input into a sludge tank 19, and the sludge collected by the sludge tank 19 is intensively input into a filter pressing device 20 for filter pressing dehydration treatment.
Both step S2 and step S3 comprise the steps of: the supernatant liquid of the sludge tank 19 flows back to the adjusting tank 1 to dilute and adjust raw water garbage percolate and kitchen waste water.
Comparative example 1
The comprehensive treatment method of landfill leachate and kitchen waste water in the comparative example is the same as that in example 1, except that no bacillus biological filler is arranged in the aerobic tank 18 in the step (3).
Comparative example 2
The method for comprehensively treating landfill leachate and kitchen waste water in the comparative example is the same as that in example 1, except that in step (2), sewage is used in a sequential connection mannerThe BDD treatment unit is replaced by a common Fenton advanced oxidation device and a flocculation tank in the water treatment industry, and Fe (II) ions and H are added into the Fenton advanced oxidation device 2 O 2 The pH value of the formed Fenton reagent is adjusted to 1-2 by hydrochloric acid, advanced oxidation is carried out, sodium hydroxide is added to adjust the pH value to be neutral after the reaction is finished, the upper water body is input into a flocculation tank, a flocculating agent polyaluminium chloride is added, and flocculation is carried out to obtain secondary treatment wastewater.
Comparative example 3
The comprehensive treatment method of the landfill leachate and the kitchen waste water is the same as the embodiment 1, and is different from the embodiment in that in the step (2), the primary flocculation treatment is not carried out, the circulating tank 6 is not arranged, the primary electrolytic tank 4, the secondary electrolytic tank 5 and the secondary flocculation tank 7 are sequentially connected, the outlet of the secondary electrolytic tank 5 is connected with the primary electrolytic tank 4 and the secondary flocculation tank 7 in parallel through a pipeline, the primary treated waste water is directly input into the primary electrolytic tank 4, and then the primary electrolytic treatment and the secondary electrolytic treatment are carried out; returning the water body after the second-stage electrolysis treatment to the first-stage electrolytic cell 4 for continuous electrolysis when the water quality of the water body is not qualified; and after the water quality of the water body after the second-stage electrolytic treatment is qualified, the water body enters a second-stage flocculation tank 7.
The flocculating agent feeding device 13 and the deoxidant feeding device 14 are both connected with the secondary flocculation tank 7, chemicals are added, and the connection between a sludge outlet at the bottom of the secondary flocculation tank 7 and the sludge tank 19 is the same as that in the embodiment 1.
Example 2
The comprehensive treatment method of landfill leachate and kitchen waste water described in this embodiment is the same as that in embodiment 1, except that, as shown in fig. 4-6, the primary flocculation tank 3 includes a filtering zone 21 in the middle and a flocculation zone 22 around the filtering zone 21, the filtering zone 21 and the flocculation zone 22 are separated by a partition 23, and the bottom of the partition 23 and the bottom of the primary flocculation tank 3 have a space to form a circle of water passing openings 24, so that the filtering zone 21 and the flocculation zone 22 are communicated at the bottom of the primary flocculation tank 3, and the water in the flocculation zone 22 is allowed to enter the filtering zone 21;
the flocculation zone 22 is uniformly divided into four stirring zones 25, namely a plurality of stirring zones 25 are arranged around the filtration zone 21 in the circumferential direction, and no separation device is arranged between adjacent stirring zones 25, namely the adjacent stirring zones 25 are communicated with each other; a stirrer is arranged at the center of each stirring area 25, and each stirring area 25 is provided with a flocculating agent adding port and a stirring area water inlet 28;
the bottom of filtering area 21 is equipped with sand filtration layer 26, and the top of sand filtration layer 26 is equipped with swash plate disengagement zone 27, and swash plate disengagement zone 27 includes a plurality of inclined, the swash plate that is parallel to each other, and the top of swash plate disengagement zone 27 is equipped with the export of one-level flocculation basin 3.
The stirring area water inlets 28 are arranged on the upper portion of the stirring area 25 and are circumferentially arranged around the primary flocculation tank 3 relative to the stirring area water inlets 28, each stirring area water inlet 28 is connected in parallel and then connected with the outlet of the wastewater biochemical treatment tank of the BBR treatment unit 2, and the wastewater treated for one time is input into the corresponding stirring area 25 through the plurality of stirring area water inlets 28.
The flocculant adding ports are formed in the upper portion of the stirring area 25, the pH sensors are formed in the middle upper portion of the flocculation area 22, the flocculant adding ports of the stirring areas 25 are connected in parallel and then connected with the flocculant adding device 13 through the flocculant metering pump 15, the flocculant metering pump 15 controls the adding amount of the flocculant according to monitoring data of the pH sensors, and then the flocculant is added to the corresponding stirring area 25 through the adding ports to treat primary treatment wastewater.
The side wall of the bottom of the primary flocculation tank 3 is in a cone shape which inclines inwards, the bottom of the partition plate 23 is in a cone shape which inclines outwards, namely the bottom of the flocculation area 22 is in a cone shape which narrows gradually, and therefore sludge generated by flocculation reaction can be collected conveniently; the bottom of the flocculation zone 22 is provided with a sludge outlet for uniformly discharging the sludge of each stirring zone 25, and the sludge outlet is connected with a sludge tank 19.
The water filtering port 24 is provided with a filter screen, the aperture of the mesh of the filter screen is smaller than the sand filtering particle size of the sand filtering layer 26, and the filter sand is prevented from entering the flocculation area 22 and being lost from a mud outlet; the bottom of the first-stage flocculation tank 3 is provided with a sand discharge port 29.
The primary treatment wastewater passes through the flocculation zone 22, passes through the filter screen from the water passing port 24, enters the bottom of the filtration zone 21, passes through the filtration of the sand filtration layer 26 from bottom to top, then rises to the inclined plate separation zone 27, continues mud-water separation, sludge slides down to the sand filtration layer 26 by the inclined plate, clear water is discharged to the circulation tank 6 from the outlet of the primary flocculation tank 3, and the outlet of the primary flocculation tank 3 sequentially penetrates through the partition plate 23, the flocculation zone 22 and the side wall of the primary flocculation tank 3; because the bottom filtering sand of the sand filtering layer 26 firstly receives the wastewater pollutants, the bottom filtering sand needs to be replaced firstly, is discharged from the sand discharge port 29, is washed and cleaned outside, and fresh filtering sand or cleaned filtering sand is added from the top of the filtering area 21.
The structure of the secondary flocculation tank 7 is the same as that of the primary flocculation tank, and the difference is that the water inlets of the stirring areas of the secondary flocculation tank 7 are connected in parallel and then connected with the external circulation outlet 11 of the circulation tank, and qualified wastewater in the circulation tank 6 is input into the corresponding stirring areas through the water inlets of the stirring areas; the flocculant metering pump connected with the flocculant adding port of the secondary flocculation tank 7 is not the same as the flocculant metering pump connected with the primary flocculation tank; the export of second grade flocculation basin 7 runs through the baffle of second grade flocculation basin, flocculation area and the lateral wall of second grade flocculation basin in proper order, reconnection anaerobism pond 17.
TABLE 1 comparison of quality of produced water for BBAF treatment units of examples and comparative examples
As can be seen from the above table, the comprehensive treatment method for landfill leachate and kitchen waste water provided by the invention has a good treatment effect on waste water with high content of organic pollutants and high content of ammonia nitrogen, such as landfill leachate and kitchen waste water, by utilizing a BBR + BDD + BBAF combined treatment method.
Claims (10)
1. A comprehensive treatment method of landfill leachate and kitchen waste water is characterized by comprising the following steps:
s1: homogenizing and adjusting the landfill leachate and the kitchen waste water, inputting the garbage leachate and the kitchen waste water into a BBR (barium Broth-Barre) treatment unit for biochemical treatment, and degrading organic matters in the waste water by using bacillus to obtain primary treatment waste water;
s2: inputting the primary treatment wastewater into a BDD treatment unit, and sequentially performing primary flocculation treatment, primary electrolysis treatment, secondary electrolysis treatment and secondary flocculation treatment to treat refractory organic matters and organic nitrogen to obtain secondary treatment wastewater;
s3: and inputting the secondary treatment wastewater into a BBAF treatment unit, and treating nitrate nitrogen and residual organic matters in the secondary treatment wastewater to obtain produced water through anaerobic treatment, aerobic treatment and biochemical treatment of bacillus in sequence.
2. The method of claim 1, wherein in step S1, the landfill leachate and the kitchen waste water are first introduced into a conditioning tank for homogeneous conditioning and then introduced into a BBR treatment unit for biochemical treatment, wherein the BBR treatment unit comprises a waste water biochemical treatment tank and a plurality of circular biological rotating disc devices in the waste water biochemical treatment tank, the biological rotating discs are used as biological carriers for attaching and proliferating bacillus, and the waste water biochemical treatment tank is used for accommodating and treating the landfill leachate and the kitchen waste water.
3. The comprehensive treatment method of landfill leachate and kitchen waste water as claimed in claim 2, wherein in step S2, the BDD treatment unit comprises a primary flocculation tank, a primary electrolytic tank, a secondary electrolytic tank, a circulation tank and a secondary flocculation tank which are connected in sequence, wherein the primary electrolytic tank is provided with a graphene positive and negative electrode, and the secondary electrolytic tank is provided with a boron-doped diamond positive and negative electrode;
an outlet of a wastewater biochemical treatment tank of the BBR treatment unit is connected with an inlet of a first-stage flocculation tank, an outlet of the first-stage flocculation tank is connected with an external circulation inlet of a circulation tank, an internal circulation outlet of the circulation tank is connected with an inlet of a first-stage electrolytic tank through a circulation pump, and wastewater from the first-stage flocculation tank is led into the first-stage electrolytic tank;
the outlet of the first-stage electrolytic cell is connected with the inlet of the second-stage electrolytic cell, the outlet of the second-stage electrolytic cell is connected with the internal circulation inlet of the circulation pool, and the wastewater returns to the circulation pool after first-stage electrolysis and second-stage electrolysis; the outer circulation outlet of the circulation tank is connected with the inlet of the secondary flocculation tank, and the outlet of the secondary flocculation tank is connected with the BBAF treatment unit.
4. The method for comprehensively treating landfill leachate and kitchen waste water as claimed in claim 3, wherein a water quality detector is disposed in the circulation tank, and when the wastewater index in the circulation tank is not qualified, the wastewater is returned to the first-stage electrolytic tank through the internal circulation outlet, is subjected to two-stage electrolytic treatment again, and is then returned to the circulation tank;
when the wastewater index of the circulating tank is qualified, the wastewater enters a secondary flocculation tank through an external circulation outlet to be subjected to secondary flocculation treatment.
5. The comprehensive treatment method of landfill leachate and kitchen waste water according to claim 4, wherein the BDD processing unit further comprises a flocculant adding device and a deoxidant adding device, the flocculant adding device is respectively connected with the primary flocculation tank and the secondary flocculation tank through two parallel pipelines, a flocculant metering pump is respectively arranged on each of the two parallel pipelines, pH sensors are respectively arranged under the liquid level of each of the primary flocculation tank and the secondary flocculation tank and used for monitoring the pH value of water in the two flocculation tanks, and the flocculant adding device judges the flocculant dosage required by each flocculation tank according to the pH value and adds the flocculant dosage through the flocculant metering pump;
the oxygen scavenger adding device is connected with the secondary flocculation tank through an oxygen scavenger metering pump, an ORP sensor is arranged below the liquid level of the secondary flocculation tank and used for monitoring the oxidation-reduction potential of the water body of the secondary flocculation tank, the oxygen scavenger adding device judges the amount of oxygen scavenger to be added according to the numerical value of the oxidation-reduction potential, and the oxygen scavenger is quantitatively added into the secondary flocculation tank through the oxygen scavenger metering pump.
6. The method for comprehensively treating landfill leachate and kitchen waste water as claimed in claim 1, wherein in step S3, the BBAF treatment unit comprises an anaerobic tank and an aerobic tank which are connected in sequence, the water in the aerobic tank can flow back to the anaerobic tank, and the aerobic tank is provided with a biological filler attached with bacillus;
the upper portion of good oxygen pond is equipped with the back flush water export, and the back flush water export is parallelly connected drain pipe and back flow, and the drain pipe is discharged and is produced water or lets in the back flush water and wash BBAF processing unit, and the back flow connection equalizing basin is with some product water backward flow to the equalizing basin, dilutes raw water landfill leachate and kitchen waste water.
7. The method of claim 5, wherein the primary flocculation tank comprises a middle filtration zone and a flocculation zone around the filtration zone, the filtration zone and the flocculation zone are separated by a partition, and the bottom of the partition and the bottom of the primary flocculation tank have a space to form a circle of water passing openings, so that the filtration zone and the flocculation zone are communicated at the bottom of the primary flocculation tank, and water in the flocculation zone is allowed to enter the filtration zone;
the flocculation area is uniformly divided into a plurality of stirring areas, the plurality of stirring areas are distributed in the circumferential direction around the filtering area, and adjacent stirring areas are communicated with each other without a separation device; a stirrer is arranged in the center of each stirring area, and each stirring area is provided with a flocculating agent adding port and a stirring area water inlet;
the bottom of filtering area is equipped with the sand filtration layer, and the top of sand filtration layer is equipped with the swash plate disengagement zone, and the swash plate disengagement zone includes a plurality of inclined, the swash plate that is parallel to each other, and the top of swash plate disengagement zone is equipped with the export of one-level flocculation basin.
8. The method of claim 7, wherein the water inlets of the mixing zones are disposed at the upper portion of the mixing zones, each mixing zone water inlet is connected in parallel and then connected to the outlet of the wastewater biochemical treatment tank of the BBR treatment unit, and the primary treatment wastewater is inputted into the corresponding mixing zones through the water inlets of the mixing zones;
the flocculating agent feeding port is arranged on the upper portion of the stirring area, the pH sensor is arranged on the middle upper portion of the flocculation area, the flocculating agent feeding ports of all the stirring areas are connected in parallel and then connected with a flocculating agent feeding device through flocculating agent metering pumps, the flocculating agent metering pumps are used for controlling the feeding amount of the flocculating agent according to the monitoring data of the pH sensor, and then the flocculating agent is fed into the corresponding stirring area through the plurality of flocculating agent feeding ports to treat primary treatment wastewater.
9. The comprehensive treatment method of landfill leachate and kitchen waste water as claimed in claim 8, wherein the sidewall of the bottom of the primary flocculation tank is an inwardly inclined cone, the bottom of the partition is an outwardly inclined cone, and the bottom of the flocculation zone is a gradually narrowing cone, so as to facilitate collection of sludge generated by flocculation reaction;
every stirring district bottom is equipped with a mud outlet, discharges the mud in each stirring district respectively, perhaps flocculation district bottom is equipped with a mud outlet, the mud in each stirring district of unified discharge, mud outlet connection sludge impoundment.
10. The method of claim 9, wherein the water outlet is provided with a filter screen, the aperture of the filter screen is smaller than the sand filtering particle size of the sand filtering layer, so as to prevent the sand filtering from entering the flocculation area and flowing out from the sludge outlet; the bottom of the primary flocculation tank is provided with a sand discharge port.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111439861A (en) * | 2020-03-25 | 2020-07-24 | 李艾丽 | Medical sewage treatment equipment with separation function |
| CN112759200A (en) * | 2021-01-13 | 2021-05-07 | 中国科学院城市环境研究所 | Treatment method for achieving full quantity of landfill leachate to standard |
| CN112811611A (en) * | 2021-02-22 | 2021-05-18 | 青海洁神环境能源产业有限公司 | Double-group B-BAF filter tank device and sewage denitrification treatment method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111439861A (en) * | 2020-03-25 | 2020-07-24 | 李艾丽 | Medical sewage treatment equipment with separation function |
| CN112759200A (en) * | 2021-01-13 | 2021-05-07 | 中国科学院城市环境研究所 | Treatment method for achieving full quantity of landfill leachate to standard |
| CN112811611A (en) * | 2021-02-22 | 2021-05-18 | 青海洁神环境能源产业有限公司 | Double-group B-BAF filter tank device and sewage denitrification treatment method |
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