CN102167486A - Urban sludge, excrement and kitchen garbage combined treatment process - Google Patents
Urban sludge, excrement and kitchen garbage combined treatment process Download PDFInfo
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- CN102167486A CN102167486A CN2011100464017A CN201110046401A CN102167486A CN 102167486 A CN102167486 A CN 102167486A CN 2011100464017 A CN2011100464017 A CN 2011100464017A CN 201110046401 A CN201110046401 A CN 201110046401A CN 102167486 A CN102167486 A CN 102167486A
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- Y—GENERAL 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E50/00—Technologies for the production of fuel of non-fossil origin
- Y02E50/30—Fuel from waste, e.g. synthetic alcohol or diesel
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Abstract
The invention relates to an urban sludge, excrement and kitchen garbage combined treatment process as a novel process, in particular to an urban sludge, excrement and kitchen garbage combined treatment process under the demands of lower investment from government, less occupying area and lower running cost. In the combined treatment process, a pretreatment unit, a combined tempering unit, an intermediate-temperature anaerobic digestion unit, a digestive juice dewatering unit, a methane purifying unit and a biogas treating unit are included. The invention provides a novel treatment process in order to solve the problems of pollution from urban sludge, excrement and kitchen garbage.
Description
Technical field
The present invention relates to municipal sludge, ight soil and changing food waste and merge treatment process,, need municipal sludge, ight soil and changing food waste under low investment, less floor space, the requirement of less working cost to merge treatment process particularly in the government fund anxiety.
Background technology
The pollution of municipal sludge, urban night soil and changing food waste is the problem of domestic each city headache always.Municipal sludge has characteristics such as organic content is many, smell big, difficult stacking.Mainly contain multiple treatment processs such as mummification method, half-driedization, compost, anaerobic digestion now.Urban night soil has that water content is big, organic content is many, controls characteristics such as pathogenic bacteria is many, mainly contains now and municipal wastewater treatment plant combination treatment, methods such as Anaerobic Digestion separately.Changing food waste has big, the characteristics such as the organism fat content is many, complicated component of water content.The main now technologies such as compost, biological system feed, sanitary landfill, pyrolysis method, burning disposal that adopt.The traditional technology of above-mentioned Pollutant Treatment all can satisfy the requirement of national environmental protection predetermined process, but there are high, the limitation such as working cost is high, complex management, poor effect, secondary pollution of investment in the individual curing method.
Summary of the invention
The present invention all has the high characteristics of organic content according to municipal sludge, ight soil and changing food waste, adoption of innovation merges anaerobic treatment process, simplify processing technological flow, solve the problem that above-mentioned Pollutant Treatment investment is higher, running cost is too high, the novel process that provides a kind of comprehensive merging to handle, promptly municipal sludge, ight soil and changing food waste merge treatment process.
Treatment process of the present invention is important to be divided into following six unit, pretreatment unit, merges modified unit, anaeration in normal temperature digestion process unit, Digestive system processed unit, marsh gas purifying processing unit, natural pond liquid processing unit.
Described pretreatment unit is divided into three groups of different process according to the pollutent different properties.First group of municipal sludge pretreatment technology adopts the dilution stirring technique, and municipal sludge is carried out the initial adjustment homogeneous.Second group of ight soil pretreatment technology adopts solid-liquid separation, modulation to stir the organic impurity in the ight soil removed, and carry out homogeneous.The 3rd group of kitchen waste preprocessing technology adopts refuse breaking, rubbish filtering, rubbish screw press technology, with inorganic and organic separation the in the rubbish.
In the modified unit of described merging: municipal sludge, ight soil and changing food waste enter the modified unit of merging through after the pre-treatment according to 6: 1: 2 ratios.Preheat by high-temperature steam at the modified unit internal contamination thing of merging, be heated to 40 degrees centigrade, the solid content of pollutent further is adjusted to about 10% simultaneously, satisfies the requirement of follow-up anaerobic treatment.
In described anaeration in normal temperature digestion process unit: after municipal sludge, ight soil and the changing food waste of allotment homogeneous (solid content 10%) preheats, be delivered in the anaeration in normal temperature slaking apparatus by spiral pump, various different conditions according to pollutent, anaerobic environment in the automatic control and adjustment container makes anaerobically fermenting effect optimization.
Carry out in order to guarantee that anaeration in normal temperature digestion is stable, with the temperature maintenance of inside reactor mud about 35 ℃ ± 1 ℃.The outside employing of digester hot water is mixed thermic devices tank body is incubated, and inner machinery and the water-jet of adopting stirs dual mode, and pollutent is stirred.
Reactor top is that the biogas that anaerobic reaction produces leaves certain space, and the biogas in the reactor is extracted out from reactor head by the biogas gas blower, enters gas holder after purifying.Digestive system is discharged by the tank top.
In described Digestive system processed unit: municipal sludge, ight soil and the changing food waste anaeration in normal temperature digestion process about through 22 days, Digestive system need carry out solid-liquid separation.Digestive system is through after the centrifuge dehydration, and the solid of generation is that natural pond slag water ratio is about 70%, and liquid is natural pond liquid.
Contain more comprehensive nutrient and abundant organism in the slag of natural pond, be mainly polymkeric substance---the humic acid of ring compound, can be used as fertilizer.
COD content is at 2000mg/l～3000mg/l in the liquid of natural pond, NH
4-N content is at 100mg/l～2000mg/l, and total phosphorous is at 1000mg/l～1500mg/l.Can be used as liquid fertilizer is used.
At described marsh gas purifying processing unit: it is biogas that municipal sludge, ight soil and changing food waste merge another important products that mesophilic digestion produces, pressurization enters desulfurizer to biogas through the air blast machine room, desulfurization is handled a back part and is supplied with the methane boiler room, personal as pollutent preheating, the insulation of anaeration in normal temperature slaking apparatus, marsh gas purifying parsing and plant area's heating in winter, a part enters the marsh gas purifying purification system, biogas enters pipeline network of fuel gas in city after purifying purification, replenish source of the gas as the city and use.
At described natural pond liquid processing unit: the Anammox integration apparatus that natural pond liquid at first enters certain company to be provided carries out denitrogenation processing.Enter the magnesium salts reaction tank of phosphorus then, in the pond, add magnesium oxide, make phosphorus and magnesium and ammonium radical ion form magnesium ammonium phosphate (MgNH
4PO
4), i.e. struvite.In the magnesium salts settling tank of phosphorus, struvite precipitation (well fertilizer).Enter the further dephosphorization of molysite reaction tank of phosphorus at last, in reactor, add iron trichloride, formation tertiary iron phosphate precipitation, the precipitation after the separation can be used as fertilizer with the struvite mixing and sell (the medicine expense of required magnesium oxide and iron trichloride can be most by the magnesium ammonium phosphate and the tertiary iron phosphate recovery of selling).Reach the water drain emission standard through treat effluent.
In a word, minimizing reaches 60% through above-mentioned processing after stain thing, handles back water quality and is better than national comprehensive wastewater emission standard, goes out clarification of water, and stable, working cost is lower than similar waste water treatment process.
The invention has the beneficial effects as follows:
1. propose first municipal sludge, ight soil and changing food waste are merged processing.Save construction investment, floor space and reduced working cost.
2. anaeration in normal temperature is handled organism is well degraded, and produces a large amount of biogas, not only can produce economic benefit, can also reduce greenhouse gas emission.
3. technical process is simple, level of automation is high, is convenient to the engineering operation management.
4. natural pond slag and natural pond liquid contain a large amount of nitrogen, phosphorus, are suitable as organic fertilizer and are used.
5. merge and handle, make the Pollutant Treatment centralization, be convenient to the environmental risk management.
Description of drawings:
Accompanying drawing 1 has been represented the schematic process flow diagram of technology of the present invention.
Specific embodiment:
The present invention will be further described with embodiment with reference to the accompanying drawings below:
Embodiment 1: 600 tons/day of Daliang City's municipal sludges, 100 tons/day in ight soil, changing food waste merge for 200 tons/day handles pollutent composition index:
The main component table (%) of table 1 municipal sludge
| Sequence number | Test item | Content | Remarks |
| 1 | The pH value | 5.79 | |
| 2 | Water ratio | 80％ | |
| 3 | Organic | 61.9％-66.7％ | |
| 4 | Total nitrogen | 4％ | Account for dewatered sludge content |
| 5 | Total phosphorus | 2％ | Account for dewatered sludge content |
The main component table (%) of table 2 ight soil
| Sequence number | Test item | Content | Remarks |
| 1 | Solid content | 3％～5％ | |
| 2 | Organic content | 60％ | |
| 3 | The excrement colibacillus group number | 〉=24 ten thousand/100ml |
The main component table (%) of table 3 changing food waste
| Sequence number | Test item | Content | Remarks |
| 1 | The pH value | 5.0-6.0 | Wet sample |
| 2 | Water ratio | 80％ | |
| 3 | Ash content | 1.52-1.77％ | |
| 4 | TOC | 98.23％ | Dry-matter calculates |
| 5 | Density | 1.00-1.02kg/L |
Treatment process adopts method as shown in Figure 1:
Treatment process of the present invention is important to be divided into following six unit, pretreatment unit, merges modified unit, anaeration in normal temperature digestion process unit, Digestive system processed unit, marsh gas purifying processing unit, natural pond liquid processing unit.
Described pretreatment unit is divided into three groups of different process according to the pollutent different properties.First group of municipal sludge pretreatment technology adopts the dilution stirring technique, and municipal sludge is carried out mud initial adjustment homogeneous.Second group of ight soil pretreatment technology adopts solid-liquid separating equipment, a modulation jar stirring organic impurity in the ight soil to be removed, and carried out homogeneous.The 3rd group of kitchen waste preprocessing technology, rubbish promotes transfer roller, Clothoid type fly cutter crusher through discharging, food garbage storage tank, material, with refuse breaking, filtration, pass through rubbish screw press separating machine again, utilize material slag chute car solid refuse to be transported inorganic and organic separation the in the rubbish.Utilize slurries storage tank and slurries lift pump that liquid is delivered to again and merge modified unit.
The modified unit of described merging: municipal sludge, ight soil and changing food waste enter the modified unit of merging through behind the pretreatment unit according to 6: 1: 2 ratios.Preheat by high-temperature steam at the modified unit internal contamination thing of merging, be heated to 40 degrees centigrade, the solid content of pollutent further is adjusted to about 10% simultaneously, satisfies the requirement of follow-up anaerobic treatment.
Described anaeration in normal temperature digestion process unit: after municipal sludge, ight soil and the changing food waste of allotment homogeneous (solid content 10%) preheats, be delivered in the anaeration in normal temperature slaking apparatus by spiral pump, various different conditions according to pollutent, anaerobic environment in the automatic control and adjustment container makes anaerobically fermenting effect optimization.
Carry out in order to guarantee that anaeration in normal temperature digestion is stable, with the temperature maintenance of inside reactor mud about 35 ℃ ± 1 ℃.The outside employing of anaeration in normal temperature slaking apparatus hot water is mixed thermic devices tank body is incubated, and inner machinery and the water-jet of adopting stirs dual mode, and pollutent is stirred.
Anaeration in normal temperature slaking apparatus top is that the biogas that anaerobic reaction produces leaves certain space, and the biogas in the reactor is extracted out from reactor head by the biogas gas blower, enters gas holder after purifying.Digestive system is discharged by the tank top and is entered Digestive system storage pond.
Described Digestive system processed unit: municipal sludge, ight soil and changing food waste were through about 22 days anaeration in normal temperature digestion process, and Digestive system need carry out solid-liquid separation.Through after the centrifuge dehydration, the solid of generation is that natural pond slag water ratio is about 70% to Digestive system in the dehydration machine room, and liquid is natural pond liquid.
Contain more comprehensive nutrient and abundant organism in the slag of natural pond, be mainly polymkeric substance---the humic acid of ring compound, can carry out compost as fertilizer and be used.
COD content is at 2000mg/l～3000mg/l in the liquid of natural pond, NH
4-N content is at 100mg/l～2000mg/l, and total phosphorous is at 1000mg/l～1500mg/l.Can be used as liquid fertilizer is used.
Described marsh gas purifying processing unit: municipal sludge, another important products that ight soil and changing food waste merge the mesophilic digestion generation is a biogas, pressurization enters desulfurizer to biogas through the air blast machine room, desulfurization is handled a back part and is supplied with methane boiler, as the pollutent preheating, the insulation of anaeration in normal temperature slaking apparatus, marsh gas purifying is resolved and plant area's heating in winter is used by oneself, a part enters methane purifying system, biogas enters gas storage holder after purifying purification, enter the biogas compressor plant again, the outer confession as CNG fuel, enter pipeline network of fuel gas in city, replenish source of the gas as the city and use.
Described natural pond liquid processing unit: natural pond liquid enters between the liquid processing of natural pond by natural pond liquid storage pond, is introduced into the Anammox integration apparatus during processing and carries out denitrogenation processing.Enter the magnesium salts reaction tank of phosphorus then, in the pond, add magnesium oxide, make phosphorus and magnesium and ammonium radical ion form magnesium ammonium phosphate (MgNH
4PO
4), i.e. struvite.In the magnesium salts settling tank of phosphorus, struvite precipitation (well fertilizer).Enter the further dephosphorization of molysite reaction tank of phosphorus at last, in reactor, add iron trichloride, formation tertiary iron phosphate precipitation, the precipitation after the separation can be used as fertilizer with the struvite mixing and sell (the medicine expense of required magnesium oxide and iron trichloride can be most by the magnesium ammonium phosphate and the tertiary iron phosphate recovery of selling).Reach the water drain emission standard through treat effluent and enter sewage work.
The present invention is not limited to the foregoing description, and protection scope of the present invention is all classified in any equivalent concepts or change in the technical scope that the present invention discloses as.
Claims (1)
1. a municipal sludge, ight soil and changing food waste merge treatment process, it is characterized in that: mainly be divided into following six unit, pretreatment unit, merge modified unit, anaeration in normal temperature digestion process unit, Digestive system processed unit, marsh gas purifying processing unit, natural pond liquid processing unit;
Described pretreatment unit is divided into three groups of different process according to the pollutent different properties, and first group of municipal sludge pretreatment technology adopts the dilution stirring technique, and municipal sludge is carried out the initial adjustment homogeneous; Second group of ight soil pretreatment technology adopts solid-liquid separation, modulation to stir the organic impurity in the ight soil removed, and carry out homogeneous; The 3rd group of kitchen waste preprocessing technology adopts refuse breaking, rubbish filtering, rubbish screw press technology, with inorganic and organic separation the in the rubbish;
In the modified unit of described merging: municipal sludge, ight soil and changing food waste enter the modified unit of merging through after the pre-treatment according to 6: 1: 2 ratios; Preheat by high-temperature steam at the modified unit internal contamination thing of merging, be heated to 40 degrees centigrade, the solid content of pollutent further is adjusted to about 10% simultaneously, satisfies the requirement of follow-up anaerobic treatment;
In described anaeration in normal temperature digestion process unit: after municipal sludge, ight soil and the changing food waste of allotment homogeneous preheats, be delivered in the anaeration in normal temperature slaking apparatus by spiral pump, various different conditions according to pollutent, anaerobic environment in the automatic control and adjustment container makes anaerobically fermenting effect optimization;
Carry out in order to guarantee that anaeration in normal temperature digestion is stable, with the temperature maintenance of inside reactor mud about 35 ℃ ± 1 ℃; The outside employing of digester hot water is mixed thermic devices tank body is incubated, and inner machinery and the water-jet of adopting stirs dual mode, and pollutent is stirred;
Reactor top is that the biogas that anaerobic reaction produces leaves certain space, and the biogas in the reactor is extracted out from reactor head by the biogas gas blower, enters gas holder after purifying; Digestive system is discharged by the tank top;
In described Digestive system processed unit: municipal sludge, ight soil and the changing food waste anaeration in normal temperature digestion process about through 22 days, Digestive system need carry out solid-liquid separation; Digestive system is through after the centrifuge dehydration, and the solid of generation is that natural pond slag water ratio is about 70%, and liquid is natural pond liquid;
At described marsh gas purifying processing unit: it is biogas that municipal sludge, ight soil and changing food waste merge another important products that mesophilic digestion produces, pressurization enters desulfurizer to biogas through the air blast machine room, desulfurization is handled a back part and is supplied with the methane boiler room, personal as pollutent preheating, the insulation of anaeration in normal temperature slaking apparatus, marsh gas purifying parsing and plant area's heating in winter, a part enters the marsh gas purifying purification system, biogas enters pipeline network of fuel gas in city after purifying purification, replenish source of the gas as the city and use;
At described natural pond liquid processing unit: the Anammox integration apparatus that natural pond liquid at first enters certain company to be provided carries out denitrogenation processing; Enter the magnesium salts reaction tank of phosphorus then, in the pond, add magnesium oxide, make phosphorus and magnesium and ammonium radical ion form magnesium ammonium phosphate, in the magnesium salts settling tank of phosphorus, the struvite precipitation; Enter the further dephosphorization of molysite reaction tank of phosphorus at last, add iron trichloride in reactor, form the tertiary iron phosphate precipitation, the precipitation after the separation can be used as fertilizer with the struvite mixing and sell; Reach the water drain emission standard through treat effluent.
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