CN108218182A - The dewatering of anaerobically digested sludge - Google Patents
The dewatering of anaerobically digested sludge Download PDFInfo
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- CN108218182A CN108218182A CN201810178651.8A CN201810178651A CN108218182A CN 108218182 A CN108218182 A CN 108218182A CN 201810178651 A CN201810178651 A CN 201810178651A CN 108218182 A CN108218182 A CN 108218182A
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- dewatering
- sludge
- anaerobically digested
- digested sludge
- magnesium
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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
- C02F11/14—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents
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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
- C02F11/121—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- Treatment Of Sludge (AREA)
Abstract
The invention discloses a kind of dewatering of anaerobically digested sludge, it is to add in magnesium salts after alkalescent that sludge is adjusted using struvite crystallization method, to form the ammonium magnesium phosphate of indissoluble (being commonly called as guanite) crystal.On this basis, organic flocculant is added, colloidal solid is made to take off steady and mutually collision by electrical neutralization and reassembles into bulky grain, flco grain size can be effectively improved, so as to the dewatering of reinforcement sludge dehydration.The present invention uses biodegradable organic flocculant, belong to environmentally friendly for green sludge dewatering coordinating program, moisture percentage in sewage sludge can be down to less than 50%, the reduced training of pressure-off wetting system can be greatly improved, convenient for subsequently disposing and utilizing, and the present invention is based on the thought of " turning waste into wealth, recycling ", not only there is higher removal rate to nitrogen phosphorus, and precipitated product guanite is a kind of slow release fertilizer in sludge, can form the phosphorus cycle of soil crop animal mankind's soil.
Description
Technical field
The present invention relates to sewage sludge process field, more specifically, being related to a kind of method of anaerobically digested sludge dehydration.
Background technology
With the continuous improvement of china's urbanization, sewage treatment facility builds high speed development.In municipal sewage treatment
Cheng Zhong, sewage is able to qualified discharge by a series of processing, and a large amount of pollutants are enriched with, concentrated and are transferred in sludge.It is dirty
Mud is the most important by-product of Sewage Biological Treatment, is also considered as leading to one of main source of water environment secondary pollution.
Not only water content is high for urban sewage treatment plant sludge, perishable, has strong odor, and contain a large amount of pathogens, parasitic ovum
And the heavy metals such as chromium, mercury and polycyclic aromatic hydrocarbon etc. are difficult to the poisonous and harmful and carcinogen degraded, the pressure of sludge safe disposal
It is huge.The unprocessed random stacking of sludge is acted on by the erosion of rainwater and leakage, easily underground water, soil etc. is caused secondary
Pollution directly endangers human body health.
For the ease of the subsequent transportation and treatment and use of sludge, sludge can generally be taken off using chemical conditioning means
Water.With the novel specific resistance to filtration process route of sewage treatment plant --- the operation of " advanced anaerobic digestion " technique, Ke Yiyou
Effect decomposes the larger molecular organics in sludge, realizes the stabilisation of sludge, and often particle is small, alkali for the anaerobically digested sludge formed
Degree is high, and common chemical conditioning means are difficult to realize the high-efficiency dehydration of sludge.
Invention content
In view of this, the present invention proposes a kind of method of environmentally friendly anaerobically digested sludge dehydration, in anaerobic digestion
Magnesium salts is added in sludge, crystallization nuclei precipitation is formed, then adds organic flocculant on the basis of this again, realize anaerobically digested sludge
Deep dehydration, convenient for subsequent transportation and treatment and use.
A kind of dewatering of anaerobically digested sludge, includes the following steps：
1) anaerobically digested sludge is adjusted to alkalescent using alkali or acid；
2) it adds in a certain amount of magnesium salt solution to anaerobically digested sludge, a period of time stirring while adding；
3) it adds a certain amount of organic flocculant again to be added in above-mentioned reaction system, stirring a period of time；
4) mechanical dehydration separates water and dewatered sludge.
Optionally, it is 7.5-7.6 that the alkalescent in the step 1), which is PH,.
Optionally, in the step 1), the alkali is sodium hydroxide, and the acid is hydrochloric acid.
Optionally, in the step 2), the additive amount of magnesium salt solution is to make the ratio between Mg2+: PO43- amount of substance
1.0-1.5∶1。
Optionally, in the step 2), the magnesium salts is magnesium sulfate or magnesium chloride.
Optionally, process stirring while adding in the step 2) is 1-2min.
Optionally, the organic flocculant in the step 3) is chitosan or cationic starch.
Optionally, the organic flocculant dosage described in the step 3) is anaerobically digested sludge system dry solids wt
1%-5%.
Optionally, the mixing time described in the step 3) is 1-5min.
Compared with prior art, the technical solution of the present invention has the following advantages：The present invention is in the method sewage disposal
Sludge treatment field is cleverly used in, it is to add in magnesium salts after alkalescent that sludge is adjusted using crystallisation, to form indissoluble
Ammonium magnesium phosphate (being commonly called as guanite, MAP) crystal.On this basis, organic flocculant is added, colloid is made by electrical neutralization
Particle takes off steady and mutually collision and reassembles into bulky grain, flco grain size can be effectively improved, so as to taking off for reinforcement sludge dehydration
Aqueous energy.The sludge dewatering mode of the present invention is green coordinating program, and moisture percentage in sewage sludge can be down to 50% hereinafter, can substantially carry
The reduced training of high pressure dehydration equipment, convenient for subsequently disposing and utilizing；Using biodegradable biological flocculant, belong to environment
The conditioning technology of friendly；Simultaneously the present invention is based on the thought of " turning waste into wealth, recycling ", not only there is higher removal to nitrogen phosphorus
Rate, and precipitated product guanite is a kind of slow release fertilizer in sludge, can form the phosphorus of soil-crop-animal-human-soil
Cycle.
Description of the drawings
The process flow diagram of the dewatering of Fig. 1 anaerobically digested sludges of the present invention；
Specific embodiment
The preferred embodiment of the present invention is described in detail, but the present invention is not restricted to these below in conjunction with attached drawing
Embodiment.The present invention covers any replacement made in the spirit and scope of the present invention, modification, equivalent method and scheme.
In order to which the public is made to have thorough understanding to the present invention, it is described in detail in present invention below preferred embodiment specific
Details, and description without these details can also understand the present invention completely for a person skilled in the art.
The present invention is more specifically described by way of example with reference to attached drawing in the following passage.It should be noted that attached drawing is adopted
With more simplified form and using non-accurate ratio, only to convenience, the embodiment of the present invention is lucidly aided in illustrating
Purpose.
The method of sewage disposal is cleverly being used in sludge treatment field by the present invention, is adjusted using MAP crystallisations dirty
Mud is to add in magnesium salts after alkalescent, to form the ammonium magnesium phosphate of indissoluble (being commonly called as guanite, MAP) crystal.On this basis,
Environmentally friendly biological species organic flocculant is added, so as to the dewatering of reinforcement sludge dehydration.
Fig. 1 illustrates the process flow diagram of the dewatering of anaerobically digested sludge of the present invention, shown anaerobic digestion
The Opsonizing method of the green dewatering of sludge, specifically includes following steps：
1) anaerobically digested sludge is adjusted to alkalescent PH=7.5-7.6 using sodium hydroxide or hydrochloric acid；
2) magnesium salt solution is added, makes Mg2+∶PO43-The ratio between the amount of substance for 1.0-1.5: 1, stirring while adding 1~
2min；
3) organic flocculant 10-50g/kg DS are added again to be added in above-mentioned reaction system, continue 1~5min of stirring.
4) mechanical dehydration separates water and dewatered sludge.
Wherein, the magnesium salts in step 2) is magnesium sulfate or magnesium chloride.If such as add in magnesium chloride, dosage 78.35mg/
G DS generate magnesium ammonium phosphate sediment after adding in Mg salt.Biological flocculant in step 3) is that biological flocculant is chitosan or sun
Other macromolecule organic flocculating agents such as ionic starch.
The anaerobically digested sludge system after conditioning is subjected to diaphragm press filtration deep dehydration in step 4).This method can make mud cake
Moisture content is down to 50% hereinafter, be applied to soil at the same time as fertilizer, enhances the fertilizer efficiency of sludge, synchronous removal anaerobic digestion solution
In phosphate radical and ammonia nitrogen.
The parameter of the experimentation of the present invention has carried out experimental verification, such as：The choosing of the PH optimum ranges of sludge in step 1
It selects and has done following experiment.
The anaerobically digested sludge of certain sewage treatment plant is taken to be handled as follows：Sodium hydroxide and hydrochloric acid are used first
Anaerobically digested sludge pH is adjusted to 7.0,7.4,7.6,7.8,8.0, magnesium chloride solution (MgCl2) is then added in sludge, is made
Mg2+∶PO43-The ratio between the amount of substance be 1.5: 1,1~2min stirring while adding.Then organic flocculant is added --- shell gathers
10~50g/kg of sugar DS are added in above-mentioned reaction system, continue 1~5min of stirring.Test and analyze phosphorus, nitrogen content, sludge
Grain grain size, CST, moisture content of the cake.It is shown in Table 1.Wherein, anaerobically digested sludge fundamental property is as follows：Moisture content is 95%,
PH=7.98, PO4-P content=322mg/L, NH4-N content=1300mg/L, Mg2+ content=27mg/L, sludge returning
D0.5=17 μm, CST=1400s.
Variation of 1 pH value of table to anaerobically digested sludge moisture content of the cake
| 7.0 | 7.4 | 7.6 | 7.8 | 8.0 | |
| PO4-P(mg/L) | 58 | 25 | 13 | 10 | 8 |
| NH4-N(mg/L) | 819 | 794 | 721 | 755 | 745 |
| Mg(mg/L) | 151 | 155 | 142 | 179 | 182 |
| d0.5(μm) | 278 | 278 | 286 | 286 | 264 |
| CST(s) | 71 | 67 | 55 | 58 | 80 |
| Moisture content of the cake (%) | 52 | 51 | 46 | 48 | 51 |
As seen from Table 1, increase with pH, the content of nitrogen and phosphorous reduces, and sludge returning does not have significant changes.But CST is fallen before
After rise, therefore pH is advisable with 7.6 or so.
The selection course of Mg salt dosages is as follows.The anaerobically digested sludge of certain sewage treatment plant is taken to carry out as follows
Processing：Anaerobically digested sludge pH is adjusted to 7.6 with sodium hydroxide and hydrochloric acid first, magnesium chloride solution is then added in sludge,
It is 1.0-2.0: 1 to make the ratio between Mg2+: PO43- amount of substance, 1~2min stirring while adding.Then organic-flocculation is added
Agent --- 10~50g/kg of chitosan DS are added in above-mentioned reaction system, continue 1~5min of stirring.Detection and analysis phosphorus, nitrogen contain
Amount, sludge returning, CST, moisture content of the cake.
Variation of the 2 Mg salt dosage of table to anaerobically digested sludge moisture content of the cake
| 1.0∶1 | 1.2∶1 | 1.5∶1 | 1.8∶1 | 2.0∶1 | |
| PO4-P(mg/L) | 62 | 51 | 43 | 43 | 44 |
| NH4-N(mg/L) | 787 | 764 | 731 | 745 | 747 |
| Mg(mg/L) | 79 | 87 | 167 | 289 | 332 |
| d0.5(μm) | 267 | 277 | 281 | 273 | 278 |
| CST(s) | 69 | 61 | 64 | 66 | 67 |
| Moisture content of the cake (%) | 49 | 47 | 49 | 50 | 49 |
As seen from Table 2, detest with Mg2+: PO43- the ratio between the amount of substance increase, gradually increasing for MgCl2 solution dosages
The content of nitrogen and phosphorous slightly declines in oxygen digested sludge, and sludge returning slightly rises.But CST is declined slightly trend, shows to add
The magnesium salts of excess does not make significant difference simultaneously, and increase the ratio between cost, therefore Mg2+: PO43- amount of substance instead is with 1.2-1.5: 1
Preferably.
Here a sample is only gived, the verification of multiple samples is passed through in the selection of each parameter in practice.
The present invention is mainly being adjusted to weakly alkaline anaerobically digested sludge by adding Mg salt, can be with digested sludge liquid
A large amount of existing ammonium ions and phosphate anion reaction generation MgNH4PO4 precipitations, are commonly called as guanite, the precipitation in phase component
Crystallization nuclei is formed as the substrate in sludge system, supports the flocculation structure of sludge, reduces its compressibility, while can be with
The sticky ingredient of Sludge Surface is covered by crystallization process, improves the strainability of sludge, can also recycle in waste water simultaneously
Ammonia nitrogen and phosphorus.On this basis, when adding environmentally friendly biological species organic flocculant, colloid is made by electrical neutralization
Particle takes off steady and mutually collision and reassembles into bulky grain, flco grain size can be effectively improved, so as to taking off for reinforcement sludge dehydration
Aqueous energy.
Embodiments described above does not form the restriction to the technical solution protection domain.It is any in above-mentioned implementation
Modifications, equivalent substitutions and improvements made within the spirit and principle of mode etc., should be included in the protection model of the technical solution
Within enclosing.
Claims (9)
1. a kind of dewatering of anaerobically digested sludge, which is characterized in that include the following steps：
1) anaerobically digested sludge is adjusted to alkalescent using alkali or acid；
2) it adds in a certain amount of magnesium salt solution to anaerobically digested sludge, a period of time stirring while adding；
3) it adds a certain amount of organic flocculant again to be added in above-mentioned reaction system, stirring a period of time；
4) mechanical dehydration separates water and dewatered sludge.
2. the dewatering of anaerobically digested sludge according to claim 1, it is characterised in that：Weak base in the step 1)
It is 7.5-7.6 that property, which is PH,.
3. the dewatering of anaerobically digested sludge according to claim 1, it is characterised in that：It is described in the step 1)
Alkali for sodium hydroxide, the acid is hydrochloric acid.
4. the dewatering of anaerobically digested sludge according to claim 1, it is characterised in that：In the step 2), magnesium salts
The additive amount of solution is makes magnesium ion：The ratio between amount of substance of phosphate anion is 1.0-1.5: 1.
5. the dewatering of anaerobically digested sludge according to claim 1, it is characterised in that：It is described in the step 2)
Magnesium salts be magnesium sulfate or magnesium chloride.
6. the dewatering of anaerobically digested sludge according to claim 1, it is characterised in that：Side edged in the step 2)
The process of stirring is 1-2min.
7. the dewatering of anaerobically digested sludge according to claim 1, it is characterised in that：It is organic in the step 3)
Flocculant is chitosan or cationic starch.
8. the dewatering of anaerobically digested sludge according to claim 1, it is characterised in that：Having described in the step 3)
Machine flocculant dosage is the 1%-5% of anaerobically digested sludge system dry solids wt.
9. the dewatering of anaerobically digested sludge according to claim 1, it is characterised in that：Stirring described in the step 3)
The time is mixed as 1-5min.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810178651.8A CN108218182A (en) | 2018-03-05 | 2018-03-05 | The dewatering of anaerobically digested sludge |
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| CN201810178651.8A CN108218182A (en) | 2018-03-05 | 2018-03-05 | The dewatering of anaerobically digested sludge |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113813660A (en) * | 2021-09-30 | 2021-12-21 | 天津渤化永利化工股份有限公司 | System and method for comprehensively treating ammonia II mud of combined alkali production device |
| CN115432908A (en) * | 2022-09-15 | 2022-12-06 | 北京尚水清源水处理技术有限公司 | Sludge dewatering agent and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101357818A (en) * | 2008-09-10 | 2009-02-04 | 同济大学 | Method for improving alkaline fermentation sludge dewatering performance |
| CN104803546A (en) * | 2015-03-25 | 2015-07-29 | 中国电器科学研究院有限公司 | Technology for reducing and recycling treatment of sludge of sewage treatment plant |
| KR101615615B1 (en) * | 2015-10-12 | 2016-04-27 | 한국산업기술시험원 | Preparing Method of Struvite for Chemicals Reduction |
-
2018
- 2018-03-05 CN CN201810178651.8A patent/CN108218182A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101357818A (en) * | 2008-09-10 | 2009-02-04 | 同济大学 | Method for improving alkaline fermentation sludge dewatering performance |
| CN104803546A (en) * | 2015-03-25 | 2015-07-29 | 中国电器科学研究院有限公司 | Technology for reducing and recycling treatment of sludge of sewage treatment plant |
| KR101615615B1 (en) * | 2015-10-12 | 2016-04-27 | 한국산업기술시험원 | Preparing Method of Struvite for Chemicals Reduction |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113813660A (en) * | 2021-09-30 | 2021-12-21 | 天津渤化永利化工股份有限公司 | System and method for comprehensively treating ammonia II mud of combined alkali production device |
| CN115432908A (en) * | 2022-09-15 | 2022-12-06 | 北京尚水清源水处理技术有限公司 | Sludge dewatering agent and preparation method thereof |
| CN115432908B (en) * | 2022-09-15 | 2023-12-26 | 北京尚水清源水处理技术有限公司 | Sludge dewatering agent and preparation method thereof |
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Application publication date: 20180629 |