CN108328871A - Landfill leachate efficient denitrification system and its denitrification process - Google Patents

Landfill leachate efficient denitrification system and its denitrification process Download PDF

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Publication number
CN108328871A
CN108328871A CN201810235593.8A CN201810235593A CN108328871A CN 108328871 A CN108328871 A CN 108328871A CN 201810235593 A CN201810235593 A CN 201810235593A CN 108328871 A CN108328871 A CN 108328871A
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denitrification
nitrification tank
sludge
nitrification
landfill leachate
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张聪慧
白皓
计燚淼
王凯
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Xinjiang Shui Mu Zhi Qing Environmental Protection Technology Co Ltd
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Xinjiang Shui Mu Zhi Qing Environmental Protection Technology Co Ltd
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    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00Biological treatment of water, waste water, or sewage
    • C02F3/30Aerobic and anaerobic processes
    • C02F3/302Nitrification and denitrification treatment
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F9/00Multistage treatment of water, waste water, or sewage
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F1/44Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F1/44Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
    • C02F1/444Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by ultrafiltration or microfiltration
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F1/52Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
    • C02F1/5281Installations for water purification using chemical agents
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F2001/007Processes including a sedimentation step
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2101/00Nature of the contaminant
    • C02F2101/10Inorganic compounds
    • C02F2101/16Nitrogen compounds, e.g. ammonia
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2103/00Nature of the water, waste water, sewage or sludge to be treated
    • C02F2103/06Contaminated groundwater or leachate
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2301/00General aspects of water treatment
    • C02F2301/08Multistage treatments, e.g. repetition of the same process step under different conditions
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00Biological treatment of water, waste water, or sewage
    • C02F3/28Anaerobic digestion processes

Abstract

A kind of landfill leachate efficient denitrification system and technique, moving bed biofilm reactor is combined with the denitrification pond of activated sludge membrane bioreactor, include the nuclear structure of denitrification pond+nitrification tank+ultrafiltration membrane in conjunction with moving bed biofilm reactor for the leachate of front end carbon source abundance;For the insufficient leachate of front end carbon source, the nuclear structure of denitrification pond+two level nitrification tank+ultrafiltration membrane of including level-one nitrification tank+combine moving bed biofilm reactor;For the leachate of high denitrogenation demand, include the nuclear structure of denitrification pond+two level nitrification tank+ultrafiltration membrane of Prepositive denitrification pond+level-one nitrification tank+postposition combination moving bed biofilm reactor.The present invention makes full use of existing carbon source, realizes the notable removal effect of ammonia nitrogen and total nitrogen, and reduce operating cost, has the effect of that continuous, stable, efficient and operating cost is low, is adapted to the processing of the high ammonia-nitrogen wastewaters such as consumer waste infiltration liquid.

Description

Landfill leachate efficient denitrification system and its denitrification process
Technical field
The present invention relates to field of environment engineering technology, more particularly to a kind of to be suitable for the high ammonia such as processing consumer waste infiltration liquid The denitrification system of nitrogen waste water.
Background technology
With the promotion to environmental quality requirement, country steps up the emission request of total nitrogen in externally discharged waste water.2008 What year promulgated《Household refuse landfill sites pollutant catabolic gene standard》(GB16889-2008) have for the first time to total nitrogen and clearly require. Beijing's provincial standard《Water pollutant comprehensive discharge standard》(DB11/307-2013) regulation in is directly discharged to surface water dirty Its Sewage Water Emissions of the unit of water execute 1 standard of table, and wherein ammonia nitrogen requires to be 1mg/L, and total nitrogen requires to be 10mg/L, existing Percolate biochemical processing cannot meet discharge standard requirement.
It will produce a large amount of landfill leachate in garbage processing procedure, landfill leachate has high chemical oxygen demand, height The features such as ammonia nitrogen, high saliferous and water quality and quantity are changed greatly, the landfill leachate that especially some aged refuse landfills generate In, total nitrogen content is high, and biochemical organic concentration is low, and C/N ratios are even close to 1:1.
The stable conversion of landfill leachate ammonia nitrogen in high density and total nitrogen and removal are always the row in puzzlement percolate processing Industry problem.The biochemical denitrification processing unit of percolate mostly uses traditional activated sludge process at present, and more commonly used technique is " single Activated sludge membrane bioreactor (the Membrane Bioreactor of grade ' nitrification+denitrification '+UF/MF (ultrafiltration/micro-filtration) " Reaction, MBR) method or " two-stage ' nitrification+denitrification ' series connection+UF/MF (ultrafiltration/micro-filtration) " activated sludge MBR methods.It is living Property sludge MBR techniques make ammonia nitrogen in waste water and total nitrogen be reduced to tens mg/litres from thousands of mg/litres, it is difficult to further Conversion and removal, while needing in the denitrification process of the second level to add a large amount of carbon source.
Even if percolate is discharged by single-stage or the series connection biochemical treatment of two-stage activated sludge in normal operation MBR In the still ammonia nitrogen containing 10-30mg/L or so and 100-600mg/L or so total nitrogen, cause entire percolation liquid treating system Water outlet is extremely difficult to discharge standard.Main cause is:Nitrobacteria and denitrifying bacteria in reactor sludge aerobic and It is constantly recycled in anoxic reacter, the living environment of microorganism is constantly changing, and two major classes bacterium is difficult the shape in each autoreactor At absolute predominance flora, nitrification and denitrification effect is influenced.It is in particular in that (1) utilization of carbon source is inefficient, is nitrifying anti-nitre It is mainly facultative heterotrophic bacteria to change denitrifying bacteria in (A/O) technique, and reaction is the key reaction process of organics removal, needs to disappear A large amount of carbon sources are consumed, suitable carbon-nitrogen ratio is 5-7:1, this part carbon source relies primarily on easily biodegradable organics in percolate, difficult drop It solves organic matter and additional carbon provides;(2) same to substrate competition, in order to reach within the residence time that each of pond part is limited Ideal processing target, it is necessary to make sludge retention time (SRT) maintain suitable level, to ensure that microorganism can mix life It is long;(3) in order to ensure higher sludge concentration, larger regurgitant volume is needed, causes the denitrifying anoxia condition of two level to lose, needs Further amounts of carbon source is added to consume extra dissolved oxygen, this increases the operating cost of operating system again.
Invention content
For the deficiency of existing bio-denitrification technology, present invention aims to provide a kind of landfill leachate efficient denitrification system System combines moving bed biofilm reactor (Moving Bed Biofilm Reactor, MBBR) and membrane bioreactor, profit Denitrification process processing is carried out to landfill leachate with the activated sludge denitrification system, can realize that ammonia nitrogen and the dual of total nitrogen reach Mark, and operating cost is reduced, reach continuous, stable, efficient, the up to standard and inefficient fruit of operating cost.
The technical thought of the present invention is that landfill leachate denitrification system is given birth to by activated sludge membrane bioreactor and moving bed Object membrane reactor is composed.
Activated sludge membrane bioreactor is a kind of activated sludge denitrification system, activated sludge film biology of the present invention The structure composition of reactor and the prior art are almost the same, including with lower part:
1) pretreatment unit, pretreatment unit may be heavy including grid, setting pot, regulating reservoir, coagulation according to actual conditions Shallow lake, anaerobic device etc.;
2) lifting device;
3) biochemical reactor, including nitrification tank, denitrification pond;
4) membrane separation device can be submerged membrane or external membrane;
5) reflux, including nitrification liquid reflux and/or sludge refluxing apparatus;
6) aerator, including the aerating system of nitrification tank and necessary membrane separation device aerator, aerator can be with For micro-hole aerator, jet aerator, rotational flow aeration device, oxygen supply wind turbine can be roots blower, centrifugal blower;
7) cleaning chemicals dosing plant, including the chemicals dosing plant of biochemical reactor normal operation, membrane separation device normal operation Dosing and cleaning device;
8) instrument control device, including ensure the instrument and control device of normal operation, as dissolved oxygen control system, pH are controlled System processed, temperature control system, tank level control system, flow monitoring etc., under the control of PLC, system may be implemented to transport automatically Row, few man on duty.
Above-mentioned pretreatment unit, lifting device, biochemical reactor, membrane separation device are sequentially connected, at the sequence of water Reason, reflux, aerator, cleaning chemicals dosing plant and instrument control device are for the company between aforementioned sequentially connected component It connects or the function of single component enhances.
Waste water processes or technique approximately as:
1) the boosted device of sewage is promoted to pretreatment unit;
2) enter regulating reservoir tune after entering setting pot desanding after the grid of pretreatment unit removes bulky grain suspended matter Water quality and quantity is saved, it is anti-to enter anaerobic device progress anaerobism after the boosted removal partial organic substances to coagulating sedimentation of regulating reservoir water outlet It answers, most of organic matter is removed in anaerobic device, and anaerobic effluent is anti-from the biochemistry including nitrification tank and denitrification pond is flow to Answer device;
3) in nitrification tank, the mineralized nitrogen in sewage is nitrate nitrogen and nitrite nitrogen, and dissolved oxygen comes from aerator, In denitrification pond, nitrate nitrogen and nitrite nitrogen in sewage are converted to total nitrogen effusion, and system completes nitration denitrification denitrogenation, raw Change reactor water outlet and enters membrane separation device;
4) crown_interception for passing through film produces no suspended substance in water and enters next handling result;
Wherein, biochemical reactor water outlet and/or membrane separation device water outlet by reflux be back to denitrification pond into Row nitrification liquid flows back or sludge reflux;The mating cleaning chemicals dosing plant of membrane separation device is to ensure that the automatic running of system, cleaning add Medicine device can be automatic running.
Moving bed biofilm reactor:Moving bed biological embrane method is the activated sludge process of attached growth of microorganisms, technique Principle is by adding a certain amount of suspending carrier into reactor, improving biomass and biological species in reactor.It is led It is that multiple MBBR form a series to want feature, and each MBBR has specific function, under the conditions of unique, each reactor The obligate biomembrane for reaching some processing task can be turned out.
Core of the invention improvement is denitrification pond, nitrification tank and membrane separation device part, described in detail below.
Situation is required according to water situation and effluent quality, by the anti-of moving bed biofilm reactor and membrane bioreactor Nitrification tank organically combines (hereinafter referred to as denitrification MBBR), denitrification MBBR and nitrification tank be placed in membrane separation device (such as ultrafiltration membrane, UF before), before can denitrification MBBR being placed in nitrification tank, referred to as Prepositive denitrification MBBR can also be by denitrification MBBR It is placed in after nitrification tank, referred to as rear-mounted denitrification MBBR.
Denitrification needs carbon source, should be abundant when carbon source can be provided by the dissolubility BOD (BOD) in sewage It utilizes, if carbon source is insufficient in sewage, then needs additional carbon.
There is denitrification MBBR in system, can also include the denitrification pond for not combining moving bed biofilm reactor, so Denitrification pond can it is preposition, can with postposition, can also simultaneously front and rear;Denitrification pond and nitrification tank can all can be one or It is multiple, it is not necessary to need to be arranged in pairs.
Flow automatically through the percolate of the filtered anaerobism of activated sludge membrane bioreactor other parts or regulating reservoir or passes through It is pumped to the sludge membrane bioreactor part that moving bed biofilm reactor is used in combination in the present invention, after the part is handled, Curve guide impeller is carried out into membrane separation device, and to the reflux of sludge membrane bioreactor and membrane separation device part.
Therefore, the technical scheme is that, a kind of landfill leachate efficient denitrification system, it includes the life of activated sludge film Object reactor and moving bed biofilm reactor;The membrane separation device of the activated sludge membrane bioreactor is ultrafiltration membrane;Institute It states in the denitrification pond of membrane bioreactor and the moving bed biofilm reactor is used in combination.
Further, it is medium suitable for front end carbon source sufficient (such as incineration plant Leachate site), needs that the present invention provides one kind Degree denitrogenation, the main landfill leachate efficient denitrification system for removing organic matter, being related to nuclear structure is:
The denitrification pond of above-mentioned combination moving bed biofilm reactor is preposition in nitrification tank;
Above-mentioned reflux includes sludge refluxing apparatus and nitrification liquid reflux, sludge refluxing apparatus connect ultrafiltration membrane with Nitrification tank, nitrification liquid reflux connect ultrafiltration membrane and combine the denitrification pond of moving bed biofilm reactor, will be through ultrafiltration The sludge reflux of film is back to nitrification tank through sludge refluxing apparatus, and nitrification liquid is back to denitrification through nitrification liquid reflux Pond;
As can be seen that sludge is not back to denitrification pond, therefore reflux need not be improved in order to ensure sludge concentration Amount, to well ensure denitrifying anoxia condition, while use of the moving bed biofilm reactor in denitrification pond The sludge concentration in denitrification pond and reaction can be significantly improved, to improve denitrification effect.
For above-mentioned denitrogenation sufficient, moderate suitable for front end carbon source, the rubbish of the main denitrogenation demand for removing organic matter Rubbish percolate efficient denitrification system, the present invention also provides the techniques using the system to landfill leachate efficient denitrification, including Following steps:
A) through membrane bioreactor other parts, treated that landfill leachate enters that combined use shifting in front end is arranged It is de- to carry out denitrification using existing front end carbon source is made full use of for the denitrification pond of dynamic bed biofilm reactor, the denitrification pond Nitrogen while removing partial organic substances;
B) through step a), treated that landfill leachate enters nitrification tank, and remaining organic matter is in nitrification tank by aerobic oxygen Change;
C) nitrified effluent of the nitrification tank through step b) enters ultrafiltration membrane, is intercepted with the suspended matter to nitrified effluent, And sludge reflux is back to nitrification tank through sludge refluxing apparatus, nitrification liquid is back to combined use through nitrification liquid reflux The denitrification pond of moving bed biofilm reactor.
Preferably, the reflux ratio of the sludge refluxing apparatus of above-mentioned steps c) is 1:3.
Using above-mentioned " Prepositive denitrification MBBR+ nitrification tanks+ultrafiltration membrane (UF) " technique.Prepositive denitrification MBBR makes full use of Ready-made carbon source removes partial organic substances while realizing denitrification denitrogenation, and remaining organic matter is in nitrification tank by aerobic oxygen Change;Nitrified effluent intercepts the suspended matter of water outlet through ultrafiltration membrane, and by sludge reflux to nitrification tank, further increases sludge Concentration, while nitrification liquid is back to Prepositive denitrification MBBR.Anoxic and aerobic ready-made carbon source is utilized to carry out nitration denitrification Organics removal while denitrogenation, ultrafiltration membrane to the suspended matter of water outlet intercept and sludge and nitrification liquid flow back.Sludge returns The reflux ratio of stream is only 1:When 3, denitrification percent can be more than 70%, be adjusted by the media-filling rate adjusted in the ponds denitrification MBBR total The removal rate of nitrogen.
Further, the present invention also provides suitable for front end carbon source insufficient (such as Landfill Leachate), needs Etc. degree denitrogenation landfill leachate efficient denitrification system, the nuclear structure being related to is:
Above-mentioned nitrification tank includes level-one nitrification tank and two level nitrification tank;
The denitrification pond of the combination moving bed biofilm reactor is arranged between level-one nitrification tank and two level nitrification tank Setting;
The reflux is sludge refluxing apparatus, connects the ultrafiltration membrane and level-one nitrification tank, will be through ultrafiltration membrane Sludge and nitrification liquid are back to level-one nitrification tank.
Landfill leachate efficient denitrification system insufficient for the above-mentioned carbon source suitable for sewage, needing moderate denitrogenation System, invention also provides, to the technique of landfill leachate efficient denitrification, included the following steps using the system:
A) it is carried out by level-one nitrification tank through activated sludge membrane bioreactor other parts treated landfill leachate The removal of organic matter is simultaneously by mineralized nitrogen at nitrate nitrogen or nitrite nitrogen;
B) organic particle after the nitrification processing of the level-one nitrification tank of step a) is sufficiently retained in sludge simultaneously Through hydrolyze enter in conjunction with moving bed biofilm reactor denitrification pond in, denitrification pond using nitrification tank water outlet nitrification liquid and Carbon source carries out denitrification denitrogenation, if carbon source is inadequate, Extra Section carbon source has to carry out denitrification denitrogenation while remove part Machine object;
C) landfill leachate through step b) processing enters two level nitrification tank, and remaining organic matter is aerobic in nitrification tank Oxidation;
D) landfill leachate through step c) processing passes through ultrafiltration membrane, and ultrafiltration membrane carries out suspended matter retention and simultaneously passes through sludge Sludge refluxing apparatus is back to level-one nitrification tank, to improve sludge concentration.
Using above-mentioned " nitrification+rear-mounted denitrification MBBR+ nitrifications+ultrafiltration membrane " technique, sewage first passes around nitrification tank progress The removal of organic matter is simultaneously by mineralized nitrogen at nitrate nitrogen or nitrite nitrogen, and the particulate organic matter after nitrification processing is fully It is retained in sludge and the carbon source as rear-mounted denitrification MBBR after hydrolysis, if carbon source is inadequate, Extra Section carbon source.UF is to going out The suspended matter of water retain while by sludge reflux to nitrification to improve sludge concentration.Denitrification capability is not by interior cycle at this time Or the influence of carbon source, it can be under the conditions of shorter hydraulic detention time (HRT), denitrification percent is more than 80%.
Further, the present invention also provides be applicable to higher denitrogenation requirement (such as denitrification percent requires 90% or more) Landfill leachate efficient denitrification system, the nuclear structure being related to is:
Nitrification tank includes level-one nitrification tank and two level nitrification tank;
Denitrification pond includes Prepositive denitrification pond and rear-mounted denitrification pond;
The denitrification pond of the combination moving bed biofilm reactor is rear-mounted denitrification pond;
Use Prepositive denitrification pond and rear-mounted denitrification pond respectively before and after level-one nitrification tank;
Two level nitrification tank is set after rear-mounted denitrification pond;
The reflux includes nitrification liquid reflux and sludge refluxing apparatus, and nitrification liquid reflux connects level-one nitre Change pond and Prepositive denitrification pond, to carry out level-one nitrification, denitrifying internal reflux, sludge refluxing apparatus connects the ultrafiltration membrane With Prepositive denitrification pond, by the sludge reflux through ultrafiltration membrane and nitrification liquid to Prepositive denitrification pond.
For the above-mentioned landfill leachate efficient denitrification system for being applicable to higher denitrogenation requirement, the present invention carries simultaneously It has supplied to include the following steps the technique of landfill leachate efficient denitrification using the system:
A) pass through Prepositive denitrification pond through membrane bioreactor other parts treated landfill leachate, carry out denitrification Denitrogenation, while organics removal;
B) landfill leachate through step a) rubbish enters level-one nitrification tank and carries out the removal of organic matter simultaneously by ammonia nitrogen turn It is melted into nitrate nitrogen or nitrite nitrogen;
C) nitrified effluent through step b) is back to the denitrification pond of step a) through nitrification liquid reflux, is denitrification pond Nitrification liquid is provided;
D) particulate organic matter after the nitrification processing of the level-one nitrification tank of step b) is retained in sludge and through hydrolysis Into in rear-mounted denitrification pond, rear-mounted denitrification pond is the denitrification pond in conjunction with moving bed biofilm reactor, removes level-one nitre Change pond and be discharged total nitrogen, such as carbon source deficiency, Extra Section carbon source;
E) landfill leachate through step d) processing enters two level nitrification tank, and remaining organic matter and extra carbon source are nitrifying By aerobic oxidation in pond;
F) landfill leachate through step e) processing enters ultrafiltration membrane, and ultrafiltration membrane carries out suspended matter retention and simultaneously passes through sludge Sludge stream device is back to Prepositive denitrification pond, to improve sludge concentration.
Further, the return sludge ratio of above-mentioned steps f) is no more than 1:5, it is back to Prepositive denitrification, you can ensure Total nitrogen removal efficiency is more than 99%, is far below the 1 of existing biochemical processing:10~1:20, reduce power consumption.
It further, can be according to the situation in denitrification pond, when necessary to rear-mounted denitrification MBBR in above-mentioned steps d) Carbon source is added in pond.Carbon source is one kind of methanol, glucose, flour.The amount of added carbon source is no more than 700mg/L, far below existing 1000mg/L~the 1500mg/L for having biochemical processing, substantially reduces operating cost.
Because no matter whether abundance is required for strengthening nitration denitrification denitrogenation carbon source in sewage, using " Prepositive denitrification+one Grade nitrification+rear-mounted denitrification MBBR+ two levels nitrification+ultrafiltration membrane " technique, there are internal reflux, UF sludge for level-one nitration denitrification Level-one denitrification is back to ensure that level-one nitration denitrification sludge concentration, rear-mounted denitrification MBBR need not carry out sludge and return Stream adjusts sludge concentration by adjusting proportion of filler, adds carbon source into rear-mounted denitrification MBBR when necessary, reduces due to returning The dissolved oxygen problem that stream is brought, reduces operating cost.
Further, the volume ratio of above-mentioned denitrification pond and nitrification tank is 1:Between 1-5;The ultrafiltration form membrane can Think one kind in tubular membrane, hollow fiber form film or flat film;Blender is set in denitrification pond, and blender uses banana Shape stirring blade, appearance profile lines are soft, do not damage filler;Ball-type floating stuffing is added simultaneously, and floating stuffing is using biology High molecular material is modified by the promotion formula of enzyme, and modified filler surface hydrophilicity is strong, filler and sewage angulation are small, Contact is fully, the biofilm time is short, adhesive force is good, the catalytic action of biological enzyme is promoted to make carrier through the special manufacturing procedure of multiple tracks Proportion close to water, before biofilm be 0.96~0.98/cm3It is approximately equal to 1g/cm after biofilm3;Rational appearance design, it is coarse Surface makes it have prodigious specific surface area, and comfortable growing environment is provided for microorganism mass propagation;By adjusting filler Filling rate, the sludge concentration and denitrification percent of reactor can be adjusted.
Further, the structure of above-mentioned moving bed biofilm reactor can be concrete structure, enamelled pressed steel structure, carbon steel One kind in structure, assembling concrete pipe, fiberglass, PE planks, ABS plate;The structure in the denitrification pond and nitrification tank Form is in concrete structure, enamelled pressed steel structure, carbon steel structure, assembling concrete pipe, fiberglass, PE planks, ABS plate etc. It is a kind of.
Percolate after the above-mentioned improved denitrification pond of the present invention, nitrification tank and ultrafiltration membrane portion, realize ammonia nitrogen and Total nitrogen tentatively removes, and ammonia nitrogen and total nitrogen are reduced to tens mg/litres, ammonia nitrogen can be down to a mg/litre from thousands of mg/litres. The membrane separation device of the rear end in nitrification tank and denitrification pond setting is ultrafiltration membrane (UF), is passed through simultaneously with lifting system sludge concentration Better effluent quality is obtained more than membrane filtration.
The beneficial effects of the invention are as follows:
Compared to existing biochemical denitrification technology, the present invention is had using moving bed biofilm reactor and membrane bioreactor Machine, which combines, reaches denitrogenation target, and specific advanced point is as follows:
1) rear-mounted denitrification MBBR substitutes the two level denitrification of original technique, does not need sludge reflux to rear-mounted denitrification MBBR ensures the sludge concentration and microbial activity in denitrification pond, solve original twin-stage nitration denitrification process reflows amount it is big, The disadvantage that dosage is big, operating cost is high;
2) due to each filler can be small-sized as one biochemical reactor, so anti impulsion load is strong, system It is stable;
3) suitable for being filled out to the high project of ammonia nitrogen and total nitrogen emission request or area application, by being added into existing pond Material, can also realize ammonia nitrogen, total nitrogen even organic pollution carries mark;
4) due to the particularity of filler, in addition to denitrogenation, be directed to washes oil, phosphorus, organic matter etc. have it is higher Removal rate.
Description of the drawings
From the detailed description below in conjunction with the accompanying drawings to the embodiment of the present invention, these and/or other aspects of the invention and Advantage will become clearer and be easier to understand, wherein:
Attached drawing 1 is the landfill leachate for being suitable for front end carbon source abundance, needing moderate denitrogenation of the embodiment of the present invention The primary structure of efficient denitrification system forms and process flow diagram;
Attached drawing 2 is being suitable for carbon source deficiency, needing the landfill leachate of moderate denitrogenation efficient for the embodiment of the present invention The primary structure of denitrification system forms and process flow diagram;
Attached drawing 3 is the landfill leachate efficient denitrification system for being applicable to higher denitrogenation requirement of the embodiment of the present invention Primary structure composition and process flow diagram.
Specific implementation mode
In order to make those skilled in the art more fully understand the present invention, with reference to the accompanying drawings and detailed description to this hair It is bright to be described in further detail.
Landfill leachate efficient denitrification system described in embodiment of the present invention and embodiment comprising sludge film biology Reactor and moving bed membrane bioreactor, the wherein structure composition of sludge membrane bioreactor and component function and the prior art It is almost the same, including 1) lifting device;2) pretreatment unit, pretreatment unit may include grid, sand setting according to actual conditions Pond, regulating reservoir, coagulating sedimentation, anaerobic device etc.), 3) biochemical reactor, including nitrification tank, denitrification pond;4) membrane separation device, Can be submerged membrane or external membrane);5) reflux, including nitrification liquid reflux and/or sludge refluxing apparatus;6) aeration dress It sets, including the aerating system of nitrification tank and necessary membrane separation device aerator, aerator can be micro-hole aerator, jet stream Aerator, rotational flow aeration device, oxygen supply wind turbine can be roots blower, centrifugal blower;7) chemicals dosing plant, including biochemical system are cleaned The chemicals dosing plant of normal operation, the dosing of membrane separation device normal operation and cleaning device;8) instrument control device, including ensure The instrument and control device of normal operation, such as dissolved oxygen control system, pH control systems, temperature control system, Liquid level system System, flow monitoring etc., under the control of PLC, automatic running, few man on duty may be implemented in system.
The present invention is only to being directed to the improved part of innovation structure, such as 3) biochemical reactor and 4) membrane separation device portion Point, and emphasis description is carried out with this associated reflux, the not connection and use of description section is equal to the prior art, this In invention, moving bed membrane bioreactor is combined suitable for denitrification pond.
1 landfill leachate efficient denitrification system of embodiment and its denitrification process
Use environment:For sufficient (such as incineration plant diafiltration of main organics removal, moderate denitrogenation, front end carbon source Liquid), the water outlet demand of less demanding to total nitrogen
Nuclear structure:As shown in Fig. 1, preposition in nitrification tank in conjunction with the denitrification pond of moving bed biofilm reactor;Institute It includes sludge refluxing apparatus and nitrification liquid reflux to state reflux, and sludge refluxing apparatus connects ultrafiltration membrane and nitrification tank, nitre The sludge through ultrafiltration membrane is returned in the denitrification pond changed liquid reflux connection nitrification tank and combine moving bed biofilm reactor It flow to nitrification tank, nitrification liquid is back to denitrification pond.
Technique:Prepositive denitrification MBBR makes full use of ready-made carbon source, realizes there there is removal part while denitrification denitrogenation Machine object, remaining organic matter is in nitrification tank by aerobic oxidation;Nitrified effluent carries out the suspended matter of water outlet through ultrafiltration membrane (UF) It intercepts, and nitrification liquid is back to denitrification, reflux ratio 1:3;Thickened sludge is back to nitrification tank and further increases sludge Concentration.
2 landfill leachate efficient denitrification system of embodiment and its denitrification process
Use environment:Main organics removal, moderate denitrogenation, front end carbon source is insufficient, such as Landfill Leachate, Water outlet is of less demanding to total nitrogen
Nuclear structure:As shown in Fig. 2, nitrification tank includes level-one nitrification tank and two level nitrification tank, the combination moving bed The denitrification pond setting of biofilm reactor is arranged between level-one nitrification tank and two level nitrification tank;The reflux is sludge Reflux connects the ultrafiltration membrane and level-one nitrification tank, by through ultrafiltration membrane sludge and nitrification liquid be back to level-one nitrification Pond.
Technique:Sewage first passes around level-one nitrification tank and carries out the removal of organic matter simultaneously by mineralized nitrogen at nitrate nitrogen or Asia Nitrate nitrogen, the particulate organic matter after nitrification processing are adequately retained in sludge and after hydrolysis as denitrification MBBR's Carbon source, if carbon source is inadequate, Extra Section carbon source;Denitrification MBBR water outlets enter two level nitrification tank, further remove organic matter;UF The suspended matter of water outlet retain while by sludge reflux to level-one nitrification tank to improve sludge concentration.
3 landfill leachate efficient denitrification system of embodiment and its denitrification process
Use environment:Organics removal is more demanding to water outlet total nitrogen simultaneously, and no matter whether front end carbon source is sufficient, it is desirable that strong Change nitration denitrification denitrogenation, such as water outlet requires to reach《Water pollutant comprehensive discharge standard》(DB11/307-2013), total nitrogen < 10mg/L。
Nuclear structure:As shown in Fig. 3, nitrification tank includes level-one nitrification tank and two level nitrification tank, the denitrification Chi Bao Prepositive denitrification pond and rear-mounted denitrification pond are included, the denitrification pond of the combination moving bed biofilm reactor is rear-mounted denitrification Pond;Use Prepositive denitrification pond and rear-mounted denitrification pond respectively before and after level-one nitrification tank;It is arranged after rear-mounted denitrification pond Two level nitrification tank;The reflux includes nitrification liquid reflux and sludge refluxing apparatus, nitrification liquid reflux connection one Grade nitrification tank and Prepositive denitrification pond, to carry out level-one nitrification, denitrifying internal reflux, sludge refluxing apparatus connection is described super Filter membrane and Prepositive denitrification pond, by the sludge reflux through ultrafiltration membrane and nitrification liquid to Prepositive denitrification pond.
Technique:Include the following steps:
A) pass through Prepositive denitrification pond through membrane bioreactor other parts treated landfill leachate, carry out denitrification Denitrogenation, while organics removal;
B) landfill leachate through step a) rubbish enters level-one nitrification tank and carries out the removal of organic matter simultaneously by ammonia nitrogen turn It is melted into nitrate nitrogen or nitrite nitrogen;
C) nitrified effluent through step b) is back to the denitrification pond of step a) through nitrification liquid reflux, is denitrification pond Nitrification liquid is provided;
D) particulate organic matter after the nitrification processing of the level-one nitrification tank of step b) is retained in sludge and through hydrolysis Into in rear-mounted denitrification pond, rear-mounted denitrification pond is the denitrification pond in conjunction with moving bed biofilm reactor, further denitrogenation And organics removal, it is used as carbon source, additive amount to be no more than 700mg/L depending on feelings addition methanol, glucose, a kind of of flour;
E) landfill leachate through step d) processing enters two level nitrification tank, and remaining organic matter is aerobic in nitrification tank Oxidation;
F) landfill leachate through step e) processing enters ultrafiltration membrane, and ultrafiltration membrane carries out suspended matter retention and simultaneously passes through sludge Sludge stream device is back to Prepositive denitrification pond, reflux ratio 1:5, to improve sludge concentration.
Various embodiments of the present invention are described above, above description is exemplary, and non-exclusive, and It is not limited to disclosed each embodiment.Without departing from the scope and spirit of illustrated each embodiment, for this skill Many modifications and changes will be apparent from for the those of ordinary skill in art field.Therefore, protection scope of the present invention is answered This is subject to the protection scope in claims.

Claims (14)

1. a kind of landfill leachate efficient denitrification system, including:Activated sludge membrane bioreactor;And moving-bed biofilm is anti- Answer device;
The activated sludge membrane bioreactor includes sequentially connected
Pretreatment unit, the preliminary treatment for carrying out sewage;
Lifting device;
Biochemical reactor, including nitrification tank and denitrification pond, to carry out the removal of dirty water part organic matter and turning for ammonia nitrogen Change and removes;
Membrane separation device, for retaining the suspended matter in sewage;
The activated sludge membrane bioreactor further includes
Reflux, to carry out nitrification liquid and/or sludge reflux;
Aerator, to be supplied oxygen and/or be discharged gas;
Chemicals dosing plant is cleaned, to carry out cleaning and sterilizing to device;With
Instrument control device, to realize system operation and automatically control purpose;
It is characterized in that, the membrane separation device is ultra-filtration membrane device;It is used in combination in the denitrification pond of the biochemical reactor The moving bed biofilm reactor.
2. landfill leachate efficient denitrification system as described in claim 1, which is characterized in that
The denitrification pond of the combination moving bed biofilm reactor is preposition in nitrification tank;
The reflux includes sludge refluxing apparatus and nitrification liquid reflux, and sludge refluxing apparatus connects ultrafiltration membrane and nitrification Pond, nitrification liquid reflux connect nitrification tank and combine the denitrification pond of moving bed biofilm reactor, will be through ultrafiltration membrane Sludge reflux to nitrification tank, nitrification liquid is back to denitrification pond.
3. landfill leachate efficient denitrification system as described in claim 1, which is characterized in that
The nitrification tank includes level-one nitrification tank and two level nitrification tank,
The denitrification pond of the combination moving bed biofilm reactor is arranged between level-one nitrification tank and two level nitrification tank;
The reflux is sludge refluxing apparatus, connects the ultrafiltration membrane and level-one nitrification tank, will be through the sludge of ultrafiltration membrane It is back to level-one nitrification tank.
4. landfill leachate efficient denitrification system as described in claim 1, which is characterized in that
The nitrification tank includes level-one nitrification tank and two level nitrification tank,
The denitrification pond includes Prepositive denitrification pond and rear-mounted denitrification pond,
The denitrification pond of the combination moving bed biofilm reactor is rear-mounted denitrification pond;
Use Prepositive denitrification pond and rear-mounted denitrification pond respectively before and after level-one nitrification tank;
Two level nitrification tank is set after rear-mounted denitrification pond;
The reflux includes nitrification liquid reflux and sludge refluxing apparatus, and wherein nitrification liquid reflux connects level-one nitre Change pond and Prepositive denitrification pond, to carry out the internal reflux of level-one nitrification, Prepositive denitrification;Sludge refluxing apparatus connection is described super Filter membrane and Prepositive denitrification pond, by through ultrafiltration membrane sludge and nitrification liquid be back to Prepositive denitrification pond.
5. the landfill leachate efficient denitrification system as described in any one of claim 2-4, which is characterized in that
The volume ratio of denitrification pond and nitrification tank is 1:Between 1-5;
The ultrafiltration form membrane can be one kind in tubular membrane, hollow fiber form film or flat film;
The blender with banana-shaped stirring blade is equipped in the denitrification pond;
The filler of the moving bed biofilm reactor is suspension ball-shaped filling material.
6. the landfill leachate efficient denitrification system as described in any one of claim 2-4, which is characterized in that
The structure of the moving bed biofilm reactor can be concrete structure, enamelled pressed steel structure, carbon steel structure, pin-connected panel coagulation One kind in native pipe, fiberglass, PE planks, ABS plate;
The structure type of the denitrification pond and nitrification tank is concrete structure, enamelled pressed steel structure, carbon steel structure, assembling concrete One kind in pipe, fiberglass, PE planks, ABS plate etc..
7. a kind of landfill leachate efficient denitrification technique utilizes landfill leachate efficient denitrification system as claimed in claim 2 It carries out, includes the following steps:
A) through in activated sludge membrane bioreactor pretreatment unit and lifting device treated landfill leachate enter and set It sets in the denitrification pond of the combined use moving bed biofilm reactor of front end, which makes full use of existing front end carbon Source carries out denitrification denitrogenation while removing partial organic substances;
B) through step a), treated that landfill leachate enters nitrification tank, and remaining organic matter is in nitrification tank by aerobic oxidation;
C) nitrified effluent of the nitrification tank through step b) enters ultrafiltration membrane, is intercepted with the suspended matter to nitrified effluent, and will Nitrification liquid is back to through nitrification liquid reflux and the denitrification pond of moving bed biofilm reactor is used in combination, passes through sludge reflux Sludge refluxing apparatus is back to nitrification tank, further increases sludge concentration.
8. landfill leachate efficient denitrification technique as claimed in claim 7, which is characterized in that the sludge reflux of the step c) The reflux ratio of device is 1:3.
9. a kind of landfill leachate efficient denitrification technique utilizes landfill leachate efficient denitrification system as claimed in claim 3 It carries out, includes the following steps:
A) through in activated sludge membrane bioreactor pretreatment unit and lifting device treated landfill leachate pass through one Grade nitrification tank carries out the removal of organic matter, while by mineralized nitrogen at nitrate nitrogen or nitrite nitrogen;
B) organic particle after the nitrification processing of the level-one nitrification tank of step a) is sufficiently retained in sludge and through water Solution enters in the denitrification pond in conjunction with moving bed biofilm reactor, and denitrification pond utilizes the nitrification liquid and carbon source of nitrification tank water outlet Carry out denitrification denitrogenation, if carbon source is inadequate, Extra Section carbon source, to carry out denitrification denitrogenation while remove partial organic substances;
C) landfill leachate through step b) processing enters two level nitrification tank, and remaining organic matter is in nitrification tank by aerobic oxygen Change;
D) landfill leachate through step c) processing passes through ultrafiltration membrane, and ultrafiltration membrane carries out suspended matter retention simultaneously by sludge through sludge Reflux is back to level-one nitrification tank, to improve sludge concentration.
10. a kind of landfill leachate efficient denitrification technique utilizes landfill leachate efficient denitrification system as claimed in claim 4 It carries out, includes the following steps:
A) through in activated sludge membrane bioreactor pretreatment unit and before lifting device treated landfill leachate passes through Denitrification pond is set, denitrification denitrogenation, while organics removal are carried out;
B) landfill leachate through step a) enters level-one nitrification tank and carries out the removal of organic matter simultaneously by mineralized nitrogen at nitre state Nitrogen or nitrite nitrogen;
C) nitrified effluent through step b) is back to the denitrification pond of step a) through nitrification liquid reflux, is provided for denitrification pond Nitrification liquid;
D) organic particle after the nitrification processing of the level-one nitrification tank of step b) is retained in sludge and enters through hydrolysis In rear-mounted denitrification pond, rear-mounted denitrification pond is the denitrification pond in conjunction with moving bed biofilm reactor, further to remove one The total nitrogen of grade nitrification tank water outlet;
E) landfill leachate through step d) processing enters two level nitrification tank, remaining organic matter and extra carbon source and is nitrified in two level By aerobic oxidation in pond;
F) landfill leachate through step e) processing enters ultrafiltration membrane, and ultrafiltration membrane carries out suspended matter retention simultaneously by sludge through sludge Logistics device is back to Prepositive denitrification pond, to improve sludge concentration.
11. landfill leachate efficient denitrification technique as claimed in claim 10, which is characterized in that be back in the step f) The return sludge ratio in Prepositive denitrification pond is no more than 1:5.
12. landfill leachate efficient denitrification technique as claimed in claim 10, which is characterized in that in step d) further include to The operation of carbon source is added in the denitrification pond of postposition combination moving bed biofilm reactor.
13. landfill leachate efficient denitrification technique as claimed in claim 12, which is characterized in that given birth to postposition combination moving bed The amount that carbon source is added in the denitrification pond of object membrane reactor is no more than 700mg/L.
14. landfill leachate efficient denitrification technique as claimed in claim 12, which is characterized in that carbon source be methanol, glucose, One kind in flour.
CN201810235593.8A 2018-03-21 2018-03-21 Landfill leachate efficient denitrification system and its denitrification process Pending CN108328871A (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109748394A (en) * 2019-03-08 2019-05-14 山东建筑大学 A kind of landfill leachate SBBR-SBR advanced nitrogen combined treatment process
CN110294565A (en) * 2019-04-15 2019-10-01 中山市天乙能源有限公司 A kind of percolate MBR treatment process of garbage incinerating power plant
CN111285558A (en) * 2020-03-29 2020-06-16 煤科集团杭州环保研究院有限公司 High-ammonia printing wastewater selective biological denitrification device and method
CN111470630A (en) * 2020-04-30 2020-07-31 南京大学 Efficient denitrification system and method for treating aged landfill leachate by combining aerobic fixed bed and anoxic MBR (membrane bioreactor) with humic filler

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109748394A (en) * 2019-03-08 2019-05-14 山东建筑大学 A kind of landfill leachate SBBR-SBR advanced nitrogen combined treatment process
CN110294565A (en) * 2019-04-15 2019-10-01 中山市天乙能源有限公司 A kind of percolate MBR treatment process of garbage incinerating power plant
CN110294565B (en) * 2019-04-15 2022-09-23 中山市天乙能源有限公司 Leachate MBR treatment process of waste incineration power plant
CN111285558A (en) * 2020-03-29 2020-06-16 煤科集团杭州环保研究院有限公司 High-ammonia printing wastewater selective biological denitrification device and method
CN111285558B (en) * 2020-03-29 2022-06-21 煤科集团杭州环保研究院有限公司 High-ammonia printing wastewater selective biological denitrification device and method
CN111470630A (en) * 2020-04-30 2020-07-31 南京大学 Efficient denitrification system and method for treating aged landfill leachate by combining aerobic fixed bed and anoxic MBR (membrane bioreactor) with humic filler
CN111470630B (en) * 2020-04-30 2021-07-30 南京大学 Efficient denitrification system and method for treating aged landfill leachate by combining aerobic fixed bed and anoxic MBR (membrane bioreactor) with humic filler

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