CN101891343B - Method for biologically purifying municipal sewage and recovering resources - Google Patents

Method for biologically purifying municipal sewage and recovering resources Download PDF

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Publication number
CN101891343B
CN101891343B CN2010102241184A CN201010224118A CN101891343B CN 101891343 B CN101891343 B CN 101891343B CN 2010102241184 A CN2010102241184 A CN 2010102241184A CN 201010224118 A CN201010224118 A CN 201010224118A CN 101891343 B CN101891343 B CN 101891343B
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sludge
sewage
enters
pond
mud
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CN2010102241184A
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CN101891343A (en
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袁林江
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西安建筑科技大学
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E50/00Technologies for the production of fuel of non-fossil origin
    • Y02E50/30Fuel from waste, e.g. synthetic alcohol or diesel

Abstract

The invention discloses a method for biologically purifying municipal sewage and recovering useful resources. The method comprises the following steps of: 1) discharging excess sludge into a sludge activation tank to perform aerobic aeration; 2) discharging the activated sludge and the raw sewage into a sludge adsorption tank to perform aerobic aeration; 3) precipitating sludge-water mixed solution in a precipitation tank, putting supernatant into a sewage treatment system, purifying the supernatant, then discharging the sewage, and purifying the excess sludge circularly; 4) mixing the sludge at the bottom of the precipitation tank with the sludge in an anaerobic digestion tank to perform anaerobic fermentation; 5) converting an organic substance after the anaerobic fermentation into methane gas and recovering the methane gas; 6) discharging the supernatant into a crystallizing pond, adding a magnesium salt into the crystallizing pond, adjusting the pH value to ensure that the mixture is turned into guanite deposit, and recovering the guanite deposit; 7) putting the supernatant in the crystallizing pond into the sewage treatment system; and 8) discharging the excess sludge after the anaerobic fermentation. By using the excess sludge to treat the municipal sewage, the method not only solves the problems in sewage purification, makes use of pollutants in the sewage, but also realizes sludge disposal and extracts effective resources in the sewage.

Description

A kind of biologically purifying municipal sewage also reclaims the method for resource
Affiliated technical field
The invention belongs to sewage and biological purification of waste water method, particularly a kind of biologically purifying municipal sewage also reclaims the method for useful resources.
Background technology
Sewage purification is handled and is mainly contained partition method and conversion method two big classes.Because the pollutent overwhelming majority in the municipal effluent is the inorganicss such as organic and nitrogen phosphorus of dissolving and colloidal attitude, direct method of isolation requires height, processing cost high technically, present stage direct method of isolation be difficult to be widely used in clarifying urban sewage.To the purifying treatment of municipal effluent, what adopt basically all is biotransformation method or bio-transformation-partition method.These methods all are the artificial-strengthening microbial transformations of adopting based on river and soil natural purification mechanism, utilize microbial metabolism oxygen consumption pollutent etc. to be converted into the material of Biostatic in physical environment.Because microorganism oxidation of organic compounds under aerobic environment is rapid and thorough, so mostly the saprobia conversion is the bio-oxidation that adopts under the aerobic condition also.In aerobe is handled, will in sewage, continuous oxygenation satisfy the needs of microorganism, thereby this process to consume lot of energy.The traditional wastewater biopurification is treated as the clean consumption process of energy." afford to build " the municipal sewage plant, but the high day-to-day operation expense that energy consumption caused, the problem that causes municipal sewage treatment facility normal " can not moving " is at China's ubiquity, and the highly energy-consuming problem that sewage purification is handled becomes one of universal link of restriction sewage disposal.
Pollutent in the city domestic sewage very major part is a movement from the people, these all were the fertilizer that can be used as farm crop and flowers and trees originally, but for the consideration of aspects such as health and the restriction of collecting means of transportation, people can only discharge this part material by water from the life area.This part material has become sewage after water washes away, finally be carried to sewage work through sewer line.Sewerage system makes originally at the source dispersive, is difficult to realize collecting separately and the dung urine of handling, and concentrated in sewage work, but they has become the sewage of lower concentration.From the angle of material cycle, the waste in these cities---sewage also be with other-resource that kind of form exists: organism is wherein held is containing energy, can be used for producing the energy; Nitrogen and phosphorus can be used as fertilizer.But because these materials concentration in sewage is lower and be difficult to separate in sewage, the volume of adding sewage is big, so these materials in the municipal effluent are difficult to direct utilization, can only or get rid of their oxygenolysis at present and reach the purpose of purifying waste water, and when purifying waste water, also will produce solid waste---excess sludge.These mud still need further disposal to exhaust safely in the environment to go.The sludge disposal expense account for sewage work's overall running cost near half.How both can purify waste water, to solve sludge disposal, and can utilize wherein pollutent, extraction efficient resource problem again, be the problem that modern city sewage work needs to be resolved hurrily.
Summary of the invention
The purpose that the present invention solves existing urban sewage treatment technology problem provides a kind of new biologically purifying municipal sewage and reclaims the method for useful resources, this method is by reclaiming sewage disposal, pollutent resource utilization and the sludge disposal three combines, thereby realizes purifying waste water, extracting the pollutent resource, save cost.
The objective of the invention is to pass through following technical proposals---plant biologically purifying municipal sewage and reclaim that the method for useful resources realizes, it is characterized in that this method comprises the steps:
1) excess sludge that Sewage treatment systems is produced enters the aerobic aeration that 30min is carried out in the sludge activation pond; Make D0 remain on 2-4mg/L, with sludge activation;
2) mud after will activating and raw waste water by volume 1: the ratio of 1-3 enters the sludge absorption pond, carries out aerobic aeration 30min; D0 remains on 1-2mg/L;
3) with step 2) muddy water mixed solution behind aerobic aeration enters settling tank precipitation 1.5-2h; Supernatant liquor through post precipitation enters the traditional wastewater treatment system, the oxidized decomposition of pollutants in sewage, the wastewater disposition after the purification; The excess sludge that purifies generation simultaneously enters the sludge activation pond and carries out the circularly purifying processing;
4) the settling tank bottom mud that is adsorbed with pollutent then drops into anaerobic digester by a certain percentage, with anaerobic digester in anaerobic sludge press 1-2: 1 mixed, carry out anaerobically fermenting;
5) organism is converted into methane gas in the mud behind anaerobically fermenting, and reclaims;
6) supernatant liquor through the anaerobically fermenting post precipitation enters crystallizing pond, adds magnesium salts, and regulates the pH value to 10-14 with NaOH, makes wherein that ammonium and phosphate transfection become the struvite precipitation, and reclaims;
7) supernatant liquor in the crystallizing pond enters the traditional wastewater treatment system;
8) excess sludge behind anaerobically fermenting is discharged from.
The anaerobically fermenting temperature is 30-40 ℃ in the described step 4), anaerobically fermenting time 10-16h.
Adding magnesium salts in the described step 6) is magnesium chloride, sal epsom or magnesium oxide.
To be step 1) carry out in short-term aerobic aeration with excess sludge to one of key of the present invention, its activity and adsorptive power are significantly improved, mix with sewage then and carry out oxygenation and stir, help in the mud microorganism like this organism, ammonia and phosphatic absorption, absorption in the sewage; Two of key is that step 3) is put into mud in the anaerobic sludge digestion pond, utilizes the mud with anaerobic hydrolysis and fermentation capacity that the mud that has adsorbed pollutent is decomposed, organism is converted into energy substance methane, and discharges ammonia and phosphoric acid salt.Sewage is without the biology aerobic oxidation like this, and part pollutent wherein just is removed, has obtained purification; Nitrogen phosphorus then is concentrated, and helps chemical precipitation and reclaims.
The present invention is by utilizing the waste of municipal sewage plant---excess sludge, with partial organic substances in the municipal effluent and ammonia and phosphoric acid salt absorption, absorb, separates with sewage by self precipitation of mud; And mud directly enters the anaerobic digestion stage, in sludge treatment, also adsorbed organic matter, ammonia and phosphoric acid salt are discharged, organism is converted into methane, and the ammonia and the phosphoric acid salt of high density can be reclaimed with the struvite form by existing chemical precipitation method.Purifying treatment by to the excess sludge of municipal effluent has solved and both can purify waste water, utilize pollutent wherein, has realized sludge disposal again and has extracted the wherein purpose of efficient resource.
Description of drawings
Fig. 1 is a process flow sheet of the present invention.
Embodiment
The present invention will be further described below by the drawings and specific embodiments.
Concrete technical process of the present invention as shown in Figure 1, the technology structures are in existing traditional waste water treatment process, increase sludge activation pond, sludge absorption pond, settling tank and this four processes of crystallizing pond, wherein: sludge activation pond, sludge absorption pond, settling tank, anaerobic digester and crystallizing pond are communicated with by pipeline successively; In sludge activation pond, sludge absorption pond, be provided with the pond outside be used for the aeration tube that the pneumatic pump of aeration links to each other; Settling tank is provided with the supernatant liquor outlet conduit, and the below is provided with the mud discharge line, and this pipeline is connected with the anaerobic sludge digestion pond; The anaerobic sludge digestion pond is provided with supernatant liquor and methane vent line, and excess sludge is discharged the mouth of pipe; The supernatant liquor vent line in anaerobic sludge digestion pond is communicated with crystallizing pond.
The present invention utilizes excess sludge that part pollutent in the sewage is reclaimed, and fails then oxidized decomposition in conventional process flow of recovery part, makes sewage purification.Sludge digestion is just undertaken by the existing anaerobic digester of sewage work.
The excess sludge of digester is sent in the preparation that the present invention produces the municipal sewage plant, and part pollutent in the sewage is transferred in the mud, reclaims again.So both reduced the amount of pollutant that need purify, reduced energy consumption, and also made to help pollutent " enrichment " in mud reclaiming.
Through processing of the present invention, the organism in the sewage more than 25%, ammonia and phosphoric acid salt can reclaim, in the sewage only the pollutent less than 75% be oxidized decomposition in sewage purification.The present invention can reduce more than 30% than traditional cities biological sewage treatment energy consumption, and reclaims the energy-methane and chemical fertilizer-struvite, reduces the sludge disposal burden.
Embodiment 1
1) the preceding thickened sludge (SS is 4000mg/L) of residue dehydration that the municipal sewage plant is produced enters the sludge activation pond and carries out aerobic aeration 30min, makes D0 remain on 2mg/L, with sludge activation;
2) mud and municipal effluent (the COD 260-500mg/L after will activating then, SS 220-350mg/L, ammonia nitrogen 24-40mg/L, soluble phosphate 2-5mg/L) press raw waste water 1: 3 by volume mixed, enter the sludge absorption pond and carry out aerobic aeration 30min, make mud and sewage thorough mixing, D0 is controlled at 1mg/L;
3) will be through step 2) muddy water mixed solution behind the aerobic aeration enters settling tank, precipitation 1.5h, supernatant liquor (the about 160-240mg/L of COD, SS 100-130mg/L, ammonia nitrogen 10-20mg/L and phosphorus 1-2mg/L) through post precipitation enters the traditional wastewater purification system, the oxidized decomposition of pollutants in sewage, the sewage after the purification effluxes after reaching C0D≤60mg/L, SS≤30mg/L, ammonia nitrogen≤8mg/L and phosphorus≤1mg/L; The excess sludge that purifies generation simultaneously enters the sludge activation pond and carries out activation treatment;
4) settling tank bottom be adsorbed with pollutent mud then with anaerobic digester in mud then 2: 1 by volume ratio drop into sludge digestion tank, at 35 ℃ of following anaerobically fermenting 16h;
5) organism is converted into methane gas in the mud behind anaerobically fermenting, and reclaims;
6) contain ammonia nitrogen through the supernatant liquor of anaerobically fermenting post precipitation and can reach 70-120mg/L, phosphoric acid salt phosphorus 6-15mg/L.Former relatively water, concentration is increased to more than 3 times.After adding magnesium chloride and regulating pH to 10, make wherein that ammonium and phosphate transfection become struvite, and reclaim with NaOH; 35% pollutent is recovered in adjusting raw waste water;
7) supernatant liquor in the crystallizing pond enters the traditional wastewater treatment system;
8) excess sludge behind anaerobically fermenting is discharged from.
Embodiment 2
1) the preceding thickened sludge (SS is 4000mg/L) of residue dehydration that the municipal sewage plant is produced enters the sludge activation pond and carries out aerobic aeration 30min, makes D0 remain on 4mg/L, with sludge activation;
2) mud and municipal effluent (the COD 260-500mg/L after will activating then, SS 220-350mg/L, ammonia nitrogen 24-40mg/L, soluble phosphate 2-5mg/L) press raw waste water 1: 1 by volume mixed, enter the sludge absorption pond and carry out aerobic aeration 30min, make mud and sewage thorough mixing, D0 is controlled at 2mg/L;
3) will be through step 2) muddy water mixed solution behind the aerobic aeration enters settling tank, precipitation 2h, supernatant liquor (the about 160-240mg/L of COD, SS 100-130mg/L, ammonia nitrogen 10-20mg/L and phosphorus 1-2mg/L) through post precipitation enters the traditional wastewater purification system, the oxidized decomposition of pollutants in sewage, the sewage after the purification effluxes after reaching C0D≤60mg/L, SS≤30mg/L, ammonia nitrogen≤8mg/L and phosphorus≤1mg/L; The excess sludge that purifies generation simultaneously enters the sludge activation pond and carries out activation treatment;
4) settling tank bottom be adsorbed with pollutent mud then with anaerobic digester in mud then 1: 1 by volume ratio drop into sludge digestion tank, at 30 ℃ of following anaerobically fermenting 12h;
5) organism is converted into methane gas in the mud behind anaerobically fermenting, and reclaims;
6) supernatant liquor through the anaerobically fermenting post precipitation contains ammonia nitrogen 40-80mg/L, phosphorus 8-10mg/L, and former relatively water, concentration has improved 2 times.After adding sal epsom and regulating pH to 12, make wherein that ammonium and phosphate transfection become struvite, and reclaim with NaOH; 30% pollutent is recovered in adjusting raw waste water;
7) supernatant liquor in the crystallizing pond enters the traditional wastewater treatment system;
8) excess sludge behind anaerobically fermenting is discharged from.
Embodiment 3
1) the preceding thickened sludge (SS is 4000mg/L) of residue dehydration that the municipal sewage plant is produced enters the sludge activation pond and carries out aerobic aeration 30min, makes D0 remain on 3mg/L, with sludge activation;
2) mud and municipal effluent (the COD 260-500mg/L after will activating then, SS 220-350mg/L, ammonia nitrogen 24-40mg/L, soluble phosphate 2-5mg/L) press raw waste water 1: 2 by volume mixed, enter the sludge absorption pond and carry out aerobic aeration 30min, make mud and sewage thorough mixing, D0 is controlled at 1.5mg/L;
3) will be through step 2) muddy water mixed solution behind the aerobic aeration enters settling tank, precipitation 2h, supernatant liquor (the about 160-240mg/L of COD, SS 100-130mg/L, ammonia nitrogen 10-20mg/L and phosphorus 1-2mg/L) through post precipitation enters the traditional wastewater purification system, the oxidized decomposition of pollutants in sewage, the sewage after the purification effluxes after reaching C0D≤60mg/L, SS≤30mg/L, ammonia nitrogen≤8mg/L and phosphorus≤1mg/L; The excess sludge that purifies generation simultaneously enters the sludge activation pond and carries out activation treatment;
4) settling tank bottom be adsorbed with pollutent mud then with anaerobic digester in mud then 2: 1 by volume ratio drop into sludge digestion tank, at 40 ℃ of following anaerobically fermenting 10h;
5) organism is converted into methane gas in the mud behind anaerobically fermenting, and reclaims;
6) contain ammonia nitrogen through the supernatant liquor of anaerobically fermenting post precipitation and reach 70-120mg/L, phosphoric acid salt phosphorus 6-15mg/L, former relatively water, concentration has improved 3 times.After adding magnesium oxide and regulating pH to 14, make wherein that ammonium and phosphate transfection become struvite, and reclaim with NaOH; 30% pollutent is recovered in adjusting raw waste water;
7) supernatant liquor in the crystallizing pond enters the traditional wastewater treatment system;
8) excess sludge behind anaerobically fermenting is discharged from.
Implementation result
By the enforcement of the technology of the present invention, (1) can reduce the power consumption at municipal sewage plant or regional sanitary sewage disposal station at 30-50%; (2) amount of sewage treatment process sewage sludge solid waste that produce, that need efflux also will reduce 70-80%; (3) the struvite chemical fertilizer that reclaims biogas simultaneously and can be used for fertilizing the soil.Therefore the present invention has the benefit that considerable energy saving, consumption reduction and resource reclaim.

Claims (4)

1. a biologically purifying municipal sewage and reclaim the method for resource is characterized in that this method comprises the steps:
1) excess sludge that Sewage treatment systems is produced enters the sludge activation pond and carries out in short-term aerobic aeration;
2) mud after will activating and raw waste water by volume 1: the ratio of 1-3 enters the sludge absorption pond, carries out aerobic aeration;
3) with step 2) muddy water mixed solution behind aerobic aeration enters settling tank and precipitates; Supernatant liquor through post precipitation enters the traditional wastewater treatment system, pollutants in sewage oxygenolysis, the wastewater disposition after the purification; The excess sludge that purifies generation simultaneously enters the sludge activation pond and carries out the circularly purifying processing;
4) the settling tank bottom mud 1-2 by volume then that is adsorbed with pollutent: 1 ratio drops into anaerobic digester, mixes with anaerobic sludge in the anaerobic digester, carries out anaerobically fermenting;
5) organism is converted into methane gas in the mud behind anaerobically fermenting, and reclaims;
6) supernatant liquor through the anaerobically fermenting post precipitation enters crystallizing pond, adds magnesium salts and regulates pH value with NaOH, makes wherein that ammonium and phosphate transfection become the struvite precipitation, and recovery;
7) supernatant liquor in the crystallizing pond enters the traditional wastewater treatment system;
8) excess sludge behind anaerobically fermenting is discharged from.
2. according to the described biologically purifying municipal sewage of claim 1 and reclaim the method for resource, it is characterized in that this method further comprises the steps:
1) excess sludge that Sewage treatment systems is produced enters the aerobic aeration that 30min is carried out in the sludge activation pond; Make D0 remain on 2-4mg/L, with sludge activation;
2) mud after will activating and raw waste water by volume 1: the ratio of 1-3 enters the sludge absorption pond, carries out aerobic aeration 30min; D0 remains on 1-2mg/L;
3) with step 2) muddy water mixed solution behind aerobic aeration enters settling tank, precipitation 1.5-2h; Supernatant liquor through post precipitation enters the traditional wastewater treatment system, the oxidized decomposition of pollutants in sewage, the wastewater disposition after the purification; The excess sludge that purifies generation simultaneously enters the sludge activation pond and carries out activation treatment;
4) settling tank bottom be adsorbed with pollutent mud then with anaerobic digester in mud 1-2 by volume then: 1 mixed, carry out anaerobically fermenting;
5) organism is converted into methane gas in the mud behind anaerobically fermenting, and reclaims;
6) supernatant liquor through the anaerobically fermenting post precipitation enters crystallizing pond, adds magnesium salts, and regulates the pH value to 10-14 with NaOH, makes wherein that ammonium and phosphate transfection become the struvite precipitation, and reclaims;
7) supernatant liquor in the crystallizing pond enters the traditional wastewater treatment system;
8) excess sludge behind anaerobically fermenting is discharged from.
3. according to the described biologically purifying municipal sewage of claim 1 and reclaim the method for resource, it is characterized in that the anaerobically fermenting temperature is 30-40 ℃ in the described step 4), anaerobically fermenting time 10-16h.
4. according to the described biologically purifying municipal sewage of claim 1 and reclaim the method for resource, it is characterized in that adding magnesium salts in the described step 6) is magnesium chloride or sal epsom.
CN2010102241184A 2010-07-12 2010-07-12 Method for biologically purifying municipal sewage and recovering resources CN101891343B (en)

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