CN107892456A - A kind of method of the efficient minimizing of municipal sludge - Google Patents
A kind of method of the efficient minimizing of municipal sludge Download PDFInfo
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- CN107892456A CN107892456A CN201711367824.2A CN201711367824A CN107892456A CN 107892456 A CN107892456 A CN 107892456A CN 201711367824 A CN201711367824 A CN 201711367824A CN 107892456 A CN107892456 A CN 107892456A
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/58—Treatment of water, waste water, or sewage by removing specified dissolved compounds
- C02F1/586—Treatment of water, waste water, or sewage by removing specified dissolved compounds by removing ammoniacal nitrogen
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/02—Biological treatment
- C02F11/04—Anaerobic treatment; Production of methane by such processes
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/121—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering
- C02F11/122—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering using filter presses
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/28—Anaerobic digestion processes
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/16—Nitrogen compounds, e.g. ammonia
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/02—Temperature
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/44—Time
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2301/00—General aspects of water treatment
- C02F2301/04—Flow arrangements
- C02F2301/046—Recirculation with an external loop
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/06—Sludge reduction, e.g. by lysis
Abstract
The invention discloses a kind of method of the efficient minimizing of municipal sludge, belongs to municipal sludge minimizing, resource technology field.The present invention is directed to the efficient Reduction Technology demand of dewatered sludge, dewatered sludge is handled with the technical process that hydrothermal technique is combined using anaerobic digestion, on the one hand the dissolution rate for improving mud organic substance by carrying out hydro-thermal process to the digested sludge after anaerobic digestion, on the other hand supernatant of the sludge liquid phase after deamination is handled after hydro-thermal process is mixed with dewatered sludge and carries out anaerobic digestion, to adjust the C/N of reaction system ratios and moisture content, the anaerobic digestion efficiency of sludge is effectively improved.Invigoration effect of both more than, finally realizes the efficient minimizing of sludge.
Description
Technical field
The present invention relates to a kind of method of the efficient minimizing of municipal sludge, belongs to municipal sludge minimizing, resource technology
Field.
Background technology
The processing of sewage sludge is still at present a global problem with disposal.Sludge is as in biological wastewater treatment process
Inevitable accessory substance, not only yield is huge, moisture content high (more than 99%), dehydration difficulty, processing cost height, and as located
It is improper to manage, and is easy to cause secondary pollution to environment.At present, China produces wet mud (moisture content is in terms of 80%) about every year
30000000 tons；Used processing method mainly has sanitary landfills, compost and land use and burning etc..Because sludge quantity is huge
Greatly, it is necessary to minimizing processing be carried out to sludge, to reduce the cost of disposal of sludge before final disposal is carried out.Therefore, one is sought
Reasonable, the reliable sludge reduction processing method of kind turns into focus of concern.
Anaerobic digestion gas production is a kind of environment-friendly and relatively sustainable processing method.It is dirty after Anaerobic Digestion
Partial organic substances are decomposed and converted in mud, sludge quantity is reduced, so as to realize the minimizing of sludge effect to a certain extent
Fruit；Methane Resources, which can be reclaimed, realizes recycling simultaneously.At present, Anaerobic Digestion is carried out to sludge to be widely adopted, into
For the important step of many sludge of sewage treatment plant processing.But due to the moisture content of feed sludge in traditional processing procedure
It is high so that reactor floor space is big, and construction cost is high；Simultaneously in medium temperature or hot fermentation, moisture needs to consume in sludge
Substantial amounts of energy, operating cost are of a relatively high.Therefore, the economy of traditional anaerobic sludge digestion process need further to carry
Rise.
Anaerobic digestion gas production is carried out using the excess sludge after dehydration and has more economy.Not only volume is big after sludge dewatering
Width reduces, sludge concentration increase, and anaerobic digestion reaction vessel volume and floor space is greatly reduced, is built so as to reduce engineering
And if operating cost.Further, since the limitation of single sewage treatment plant's scale and sludge yield, traditional anaerobic sludge digestion
Caused methane quantity is less, is often difficult to large-scale utilization.By the sludge of some small sewage treatment plants after dewater treatment,
Concentration is transported to a large-scale Anaerobic Digestion facility, then can reduce repeated construction and the running cost of sludge treatment facilities
With the scale effect of increase sludge anaerobic aerogenesis and recycling.At present, the sewage sludge in China largely all have passed through
Dewater treatment, this provides extraordinary condition for scale sludge anaerobic digestion gas production.
Height is relatively ripe containing solid anaerobic sludge digestion technology, and sludge takes off by press filtration again after Anaerobic Digestion
Water, the moisture content of sludge is reduced, realize the minimizing of sludge.But this method need further to improve, and is primarily due to：(1)
After anaerobic sludge digestion, dehydration is relatively difficult；(2) substantial amounts of ammonia nitrogen is contained after anaerobic sludge digestion in liquid phase, ammonia nitrogen is as one
The energy of kind neutral carbon, there is energy density big (same volume energy content liquefied ammonia is more than 1.5 times of liquid hydrogen), easily liquefaction, easy storage
The characteristics of fortune, be one has prospect new energy very much；But traditional anaerobic digestion process often only focuses on the yield of methane, and
Ignore the recovery problem of ammonia nitrogen resource；(3) after anaerobic sludge digestion, some protein, polysaccharide, lipid and lignocellulosic etc.
Larger molecular organicses, still there is 60%-70% to be present in not utilized in sludge, enter again after these organic components are appropriately processed
Row anaerobic digestion gas production, it can further improve minimizing and the energy conversion potentiality of sludge.Digested sludge after anaerobic digestion
Still need further to handle, still lack the research report of this respect at present.Therefore, more efficient minimizing and the money of sludge are realized
Source is the technical problem to remain unsolved.
The content of the invention
Object of the present invention is to provide a kind of method of the efficient minimizing of municipal sludge.
A kind of method of the efficient minimizing of municipal sludge, excess sludge is dehydrated as raw material using municipal sewage plant, used
Following method：
(1) sewage treatment plant's dehydration excess sludge is subjected to anaerobic digestion；
(2) sludge after anaerobic digestion carries out hydro-thermal process；
(3) sludge after hydro-thermal process enters solid-liquid separation system progress dewater treatment, forms solid phase and liquid phase, described solid
It is mutually sludge cake；
(4) liquid phase enters ammonia nitrogen removal and recovery system, and supernatant is obtained after the ammonia nitrogen in reclaim liquid phase；
(5) supernatant is back to anaerobic reactor front end, combine detesting after mixing in proportion with dehydration excess sludge
Oxygen digestion process；
(6) solid phase is transported outward and carries out final disposal.
In one embodiment of the invention, in the step (1) sewage disposal plant excess sludge sludge solid content
>=8.0%.
In one embodiment of the invention, the combined anaerobic digestion of the step (1), anaerobic digestion temperature 35-
37 DEG C, anaerobic digestion time is 15-25 days.
In one embodiment of the invention, the treatment temperature of hydro-thermal process is 140-210 DEG C in the step (2),
Processing time is 0-4h.
In one embodiment of the invention, the treatment temperature of hydro-thermal process is 180-210 DEG C in the step (2),
Processing time is 1-4h.
In one embodiment of the invention, piece-rate system is plate compression in the step (3).
In one embodiment of the invention, in the step (3) sludge cake moisture content below 70%.
In one embodiment of the invention, in the step (4) in supernatant ammonia nitrogen concentration drop to 100mg/L with
Under.
In one embodiment of the invention, the part in the step (4) in supernatant is back to anaerobic digestion
Mixed in reactor with dehydration excess sludge and carry out combined anaerobic digestion；Remainder supernatant is discharged into sewage treatment plant, is
Biological carbon and phosphorous removal provides carbon source.
In one embodiment of the invention, in the step (5) by sewage disposal plant excess sludge with disappearing through anaerobism
Change and the sludge supernatant in mass ratio 2 after hydro-thermal process:1-2:3 mixing, carry out Anaerobic Digestion, and mixed sludge contains
Gu rate is 6-12%；Anaerobic digestion temperature is 35-37 DEG C, and anaerobic digestion time is 15-25 days.
Beneficial effects of the present invention：
(1) present invention carries out Anaerobic Digestion for the dehydration excess sludge that solid content is 8%-20%, can not only have
Effect reduces anaerobic digestion reaction vessel volume, and is advantageous to focusing on for municipal sludge；
(2) hydro-thermal process is carried out to digested sludge, can be with large-scale application, and chemical agent need not be introduced；At hydro-thermal
Reason is preferable to the organic matter solute effect in sludge, can particularly promote sludge microbe breaking-wall cell and some macromoleculars to have
The dissolving of machine thing (such as protein, polysaccharide, lipid, lignocellulosic) and the conversion to small molecule.By the dirt after hydro-thermal process
Mud supernatant supplements the C/N ratios and moisture content that can regulate and control anaerobic system to the anaerobic digester system of excess sludge, final effective
Improve the decomposition efficiency of sludge and the transformation efficiency of organic matter；
(3) more traditional height contains for solid anaerobic sludge digestion process, and the conversion ratio of organic matter can improve 15% in sludge
More than, the sludge solid fraction moisture content after hydro-thermal process is reduced to less than 70%, and the decrement rate of sludge reaches more than 65%；
(4) digested sludge is post-processed, part harmful constituent in sludge (such as ammonia nitrogen, salinity) is entered liquid phase,
Secondary pollution of the digested sludge to environment can be reduced.
Brief description of the drawings
Fig. 1 is a kind of process flow diagram of the method for the efficient minimizing of municipal sludge；
Embodiment
Mud organic substance resolution ratio computational methods：
Mud organic substance dissolution rate computational methods in hydro-thermal process：
It is dehydrated the decrement rate computational methods of excess sludge：
Embodiment 1：The method of the efficient minimizing of municipal sludge
A kind of method of the efficient minimizing of municipal sludge, the technological system are mainly disappeared by dewatered sludge feed unit, anaerobism
Change reactor, sludge separation of solid and liquid (dehydration) system and marsh gas recovery device composition.
The running of whole sludge reduction treatment technology system is as follows：
(1) solid content is that 18%-20% dehydration excess sludge enters anaerobic digestion reaction vessel, anaerobism by feed unit
It is 35 DEG C to digest temperature, and anaerobic digestion time is 25 days.
(2) enter solid-liquid separation system (plate compression) by postdigestive sludge and carry out dewater treatment；Dirt after processing
Mud moisture content of the cake drops to 70%, and outward transport carries out final disposal.
After technical matters processing, mud organic substance resolution ratio reaches about 32%, is dehydrated the minimizing of excess sludge
Rate reaches 45%.
Embodiment 2：The method of the efficient minimizing of municipal sludge
A kind of method of the efficient minimizing of municipal sludge, the technological system are mainly disappeared by dewatered sludge feed unit, anaerobism
Change reactor, hydro-thermal process system, sludge separation of solid and liquid (dehydration) system, sludge liquid phase ammonia nitrogen removal and recovery system, supernatant
Liquid reflux and marsh gas recovery device composition.
The running of whole sludge reduction treatment technology system is as follows：
(1) solid content is that 18%-20% dehydration excess sludge enters anaerobic digestion reaction vessel by feed unit, simultaneously
The supernatant to flow back after anaerobic digestion and hydro-thermal process is added into anaerobic digestion reaction vessel front end to mix with dewatered sludge
Carry out combined anaerobic digestion after conjunction, the mixed proportion of dewatered sludge and supernatant is about 1:1, the moisture content of sludge is about after mixing
10% (between 8%-12%)；Anaerobic digestion temperature is 35 DEG C, and anaerobic digestion time is 25 days；
(2) enter hydro-thermal process system by postdigestive sludge and carry out hydro-thermal process, treatment temperature and time such as table 1
It is shown；
The influence of the hydro-thermal process temperature of table 1 and time to digestion mud organic substance dissolution rate
As seen from the above table, when treatment temperature is 120-210 DEG C, organic matter dissolution rate gradually increases in digested sludge, but
120-140 DEG C, under conditions of heating 1h, organic matter dissolution rate is relatively low；Under the conditions of 160-180 DEG C, the plot ratio of organic matter is significantly
Increase；And the dissolution rate of organic matter increases unobvious after temperature is more than 180 DEG C.Under the conditions of 180 DEG C, the dissolution rate of organic matter
Increase with the heat time and increased, but after the heat time is more than 1h, the dissolution rate of organic matter increases unobvious.Therefore,
Consider from organic matter dissolved efficiency and economic angle, for digested sludge hydro-thermal process, it is 180 DEG C to select treatment temperature, processing
Time is advisable for 1h.
(3) sludge enters solid-liquid separation system (plate compression) progress dewater treatment after hydro-thermal process；Sludge after processing
Moisture content of the cake drops to less than 65%, and outward transport carries out final disposal；Liquid phase part enters next processing links；
(4) sludge liquid phase part enters ammonia nitrogen removal and recovery system after hydro-thermal process, the ammonia in reclaim liquid phase, in realization
Ammonia nitrogen concentration is reduced to below 100mg/L in clear liquid；
(5) supernatant obtained in process (4) is subjected to Anaerobic Digestion, anaerobic digestion temperature is 35 DEG C, and anaerobism disappears
It is 10 days to change the time, and methane energy is reclaimed after anaerobic digestion.
After technical matters processing, organic matter decomposition rate reaches about 53% in sludge, is dehydrated the decrement of excess sludge
Rate reaches more than 65%.
Embodiment 3：The method of the efficient minimizing of municipal sludge
A kind of efficient Reduction Technology of municipal sludge, the technological system is mainly by dewatered sludge feed unit, anaerobic digestion
Reactor, hydro-thermal process system, sludge separation of solid and liquid (dehydration) system, sludge liquid phase ammonia nitrogen removal and recovery system, supernatant
Reflux and marsh gas recovery device composition.
The running of whole sludge reduction treatment technology system is as follows：
(1) solid content is that 18%-20% dehydration excess sludge enters anaerobic digestion reaction vessel by feed unit, simultaneously
The supernatant to be flowed back after hydrothermal treatment is added to after anaerobic digestion reaction vessel front end mixes with dewatered sludge and joined
The mixed proportion of conjunction anaerobic digestion, dewatered sludge and supernatant is about 1:1, the moisture content of sludge is about 10% (8%- after mixing
Between 12%)；Anaerobic digestion temperature is 35 DEG C, and anaerobic digestion time is 25 days.
(2) enter hydro-thermal process system by postdigestive sludge and carry out hydro-thermal process, treatment temperature is 180 DEG C, processing
Time is 60min；
(3) sludge enters solid-liquid separation system (plate compression) progress dewater treatment after hydro-thermal process；Sludge after processing
Moisture content of the cake drops to less than 65%, and outward transport carries out final disposal；Liquid phase part enters next processing links；
(4) sludge liquid phase part enters ammonia nitrogen removal and recovery system after hydro-thermal process, the ammonia in reclaim liquid phase, in realization
Ammonia nitrogen concentration is reduced to below 100mg/L in clear liquid；
(5) part in the supernatant that will be obtained in process (4) is back in anaerobic digestion reaction vessel remaining with dehydration
Sludge mixing carries out combined anaerobic digestion, and backflow ratio met journey (1)；Remainder supernatant is discharged into sewage treatment plant, is
Biological carbon and phosphorous removal provides carbon source.
After technical matters processing, the anaerobic sludge digestion time shortens, and organic matter decomposition rate reaches 55% in sludge
More than, the decrement rate for being dehydrated excess sludge reaches more than 65%.
Although the present invention is disclosed as above with preferred embodiment, it is not limited to the present invention, any to be familiar with this skill
The people of art, without departing from the spirit and scope of the present invention, it can all do various change and modification, therefore the protection model of the present invention
Enclose being defined of being defined by claims.
Claims (10)
- A kind of 1. method of the efficient minimizing of municipal sludge, it is characterised in that step is as follows：(1) sewage treatment plant's dehydration excess sludge is subjected to anaerobic digestion；(2) sludge after anaerobic digestion carries out hydro-thermal process；(3) sludge after hydro-thermal process enters solid-liquid separation system progress dewater treatment, forms solid phase and liquid phase, the solid phase are Sludge cake；(4) liquid phase enters ammonia nitrogen removal and recovery system, and supernatant is obtained after the ammonia nitrogen in reclaim liquid phase；(5) supernatant is back to anaerobic reactor front end, carrying out joint anaerobism after being mixed in proportion with dehydration excess sludge disappears Change is handled；(6) solid phase is transported outward and carries out final disposal.
- 2. according to the method for claim 1, it is characterised in that sewage treatment plant is dehydrated excess sludge in the step (1) Sludge solid content >=8.0%.
- 3. according to the method for claim 1, it is characterised in that the combined anaerobic digestion of the step (1), anaerobic digestion temperature Spend for 35-37 DEG C, anaerobic digestion time is 15-25 days.
- 4. according to the method for claim 1, it is characterised in that the treatment temperature of hydro-thermal process is in the step (2) 140-210 DEG C, processing time 0-4h.
- 5. according to the method for claim 1, it is characterised in that the treatment temperature of hydro-thermal process is in the step (2) 180-210 DEG C, processing time 1-4h.
- 6. according to the method for claim 1, it is characterised in that piece-rate system is plate compression in the step (3).
- 7. according to the method for claim 1, it is characterised in that in the step (3) sludge cake moisture content 70% with Under.
- 8. according to the method for claim 1, it is characterised in that ammonia nitrogen concentration drops in supernatant in the step (4) Below 100mg/L.
- 9. according to the method for claim 1, it is characterised in that the part in the step (4) in supernatant is back to Mixed in anaerobic digestion reaction vessel with dehydration excess sludge and carry out combined anaerobic digestion；Remainder supernatant is discharged at sewage Factory is managed, carbon source is provided for biological carbon and phosphorous removal.
- 10. according to the method for claim 1, it is characterised in that in the step (5) by sewage disposal plant excess sludge with Sludge supernatant in mass ratio 2 after anaerobic digestion and hydro-thermal process:1-2:3 mixing, carry out Anaerobic Digestion, after mixing Sludge solid content be 6-12%；Anaerobic digestion temperature is 35-37 DEG C, and anaerobic digestion time is 15-25 days.
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Cited By (5)
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| CN108558162A (en) * | 2018-04-12 | 2018-09-21 | 大连理工大学 | A kind of method of excess sludge hydrothermal carbonization liquid recycling |
| CN111410352A (en) * | 2020-04-02 | 2020-07-14 | 四川深蓝环保科技有限公司 | System and process method for preparing carbon source from resource type urban biomass hydrothermal filtrate |
| CN113526806A (en) * | 2020-04-15 | 2021-10-22 | 湖南军信环保股份有限公司 | Sludge treatment method |
| CN114195352A (en) * | 2021-12-14 | 2022-03-18 | 郭楠 | Deep dehydration treatment process for sludge of industrial sewage treatment plant |
| CN115259519A (en) * | 2022-08-17 | 2022-11-01 | 中节能工程技术研究院有限公司 | Municipal sludge pyrohydrolysis anaerobic digestion liquid treatment method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108558162A (en) * | 2018-04-12 | 2018-09-21 | 大连理工大学 | A kind of method of excess sludge hydrothermal carbonization liquid recycling |
| CN111410352A (en) * | 2020-04-02 | 2020-07-14 | 四川深蓝环保科技有限公司 | System and process method for preparing carbon source from resource type urban biomass hydrothermal filtrate |
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| CN114195352A (en) * | 2021-12-14 | 2022-03-18 | 郭楠 | Deep dehydration treatment process for sludge of industrial sewage treatment plant |
| CN115259519A (en) * | 2022-08-17 | 2022-11-01 | 中节能工程技术研究院有限公司 | Municipal sludge pyrohydrolysis anaerobic digestion liquid treatment method |
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