CN109608021A - Deep dehydration method for sludge - Google Patents
Deep dehydration method for sludge Download PDFInfo
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- CN109608021A CN109608021A CN201811621880.9A CN201811621880A CN109608021A CN 109608021 A CN109608021 A CN 109608021A CN 201811621880 A CN201811621880 A CN 201811621880A CN 109608021 A CN109608021 A CN 109608021A
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- sludge
- persulfate
- dehydration method
- deep dehydration
- biomass
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- 239000010802 sludge Substances 0.000 title claims abstract description 86
- 238000000034 method Methods 0.000 title claims abstract description 22
- 230000018044 dehydration Effects 0.000 title claims abstract description 19
- 238000006297 dehydration reaction Methods 0.000 title claims abstract description 19
- JRKICGRDRMAZLK-UHFFFAOYSA-L peroxydisulfate Chemical compound [O-]S(=O)(=O)OOS([O-])(=O)=O JRKICGRDRMAZLK-UHFFFAOYSA-L 0.000 claims abstract description 21
- 239000002028 Biomass Substances 0.000 claims abstract description 13
- 241000209094 Oryza Species 0.000 claims description 46
- 235000007164 Oryza sativa Nutrition 0.000 claims description 46
- 235000009566 rice Nutrition 0.000 claims description 46
- 239000010903 husk Substances 0.000 claims description 16
- CHQMHPLRPQMAMX-UHFFFAOYSA-L sodium persulfate Chemical compound [Na+].[Na+].[O-]S(=O)(=O)OOS([O-])(=O)=O CHQMHPLRPQMAMX-UHFFFAOYSA-L 0.000 claims description 12
- 238000003756 stirring Methods 0.000 claims description 11
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 claims description 8
- 150000002505 iron Chemical class 0.000 claims description 8
- USHAGKDGDHPEEY-UHFFFAOYSA-L potassium persulfate Chemical compound [K+].[K+].[O-]S(=O)(=O)OOS([O-])(=O)=O USHAGKDGDHPEEY-UHFFFAOYSA-L 0.000 claims description 8
- 235000019394 potassium persulphate Nutrition 0.000 claims description 8
- 238000006243 chemical reaction Methods 0.000 claims description 7
- 239000007788 liquid Substances 0.000 claims description 7
- 239000000654 additive Substances 0.000 claims description 6
- 230000000996 additive effect Effects 0.000 claims description 6
- 238000012545 processing Methods 0.000 claims description 6
- ROOXNKNUYICQNP-UHFFFAOYSA-N ammonium persulfate Chemical compound [NH4+].[NH4+].[O-]S(=O)(=O)OOS([O-])(=O)=O ROOXNKNUYICQNP-UHFFFAOYSA-N 0.000 claims description 4
- 238000001035 drying Methods 0.000 claims description 3
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 claims description 2
- ZLXPLDLEBORRPT-UHFFFAOYSA-M [NH4+].[Fe+].[O-]S([O-])(=O)=O Chemical compound [NH4+].[Fe+].[O-]S([O-])(=O)=O ZLXPLDLEBORRPT-UHFFFAOYSA-M 0.000 claims description 2
- 229910001870 ammonium persulfate Inorganic materials 0.000 claims description 2
- 238000000498 ball milling Methods 0.000 claims description 2
- 229910002651 NO3 Inorganic materials 0.000 claims 1
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 claims 1
- XBDUTCVQJHJTQZ-UHFFFAOYSA-L iron(2+) sulfate monohydrate Chemical compound O.[Fe+2].[O-]S([O-])(=O)=O XBDUTCVQJHJTQZ-UHFFFAOYSA-L 0.000 claims 1
- JRKICGRDRMAZLK-UHFFFAOYSA-N peroxydisulfuric acid Chemical group OS(=O)(=O)OOS(O)(=O)=O JRKICGRDRMAZLK-UHFFFAOYSA-N 0.000 claims 1
- 230000003647 oxidation Effects 0.000 abstract description 12
- 238000007254 oxidation reaction Methods 0.000 abstract description 12
- 229910001385 heavy metal Inorganic materials 0.000 abstract description 8
- 150000001875 compounds Chemical class 0.000 abstract description 2
- 238000010276 construction Methods 0.000 abstract description 2
- BAUYGSIQEAFULO-UHFFFAOYSA-L iron(2+) sulfate (anhydrous) Chemical compound [Fe+2].[O-]S([O-])(=O)=O BAUYGSIQEAFULO-UHFFFAOYSA-L 0.000 abstract 1
- 230000003750 conditioning effect Effects 0.000 description 14
- 238000005516 engineering process Methods 0.000 description 11
- 230000004913 activation Effects 0.000 description 10
- 230000000052 comparative effect Effects 0.000 description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 8
- SURQXAFEQWPFPV-UHFFFAOYSA-L iron(2+) sulfate heptahydrate Chemical group O.O.O.O.O.O.O.[Fe+2].[O-]S([O-])(=O)=O SURQXAFEQWPFPV-UHFFFAOYSA-L 0.000 description 7
- 229910000359 iron(II) sulfate Inorganic materials 0.000 description 7
- 235000003891 ferrous sulphate Nutrition 0.000 description 6
- 239000011790 ferrous sulphate Substances 0.000 description 6
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 6
- 238000002386 leaching Methods 0.000 description 5
- 239000010865 sewage Substances 0.000 description 5
- 239000000126 substance Substances 0.000 description 5
- 239000000843 powder Substances 0.000 description 4
- 239000002994 raw material Substances 0.000 description 4
- 230000008859 change Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- -1 hydroxyl radical free radical Chemical class 0.000 description 3
- 239000002253 acid Substances 0.000 description 2
- 229910052793 cadmium Inorganic materials 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 239000005416 organic matter Substances 0.000 description 2
- 150000004968 peroxymonosulfuric acids Chemical class 0.000 description 2
- 239000002957 persistent organic pollutant Substances 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 150000003254 radicals Chemical class 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 241000588724 Escherichia coli Species 0.000 description 1
- 229910013850 M2S2O8 Inorganic materials 0.000 description 1
- 229910003202 NH4 Inorganic materials 0.000 description 1
- 240000002853 Nelumbo nucifera Species 0.000 description 1
- 235000006508 Nelumbo nucifera Nutrition 0.000 description 1
- 235000006510 Nelumbo pentapetala Nutrition 0.000 description 1
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 1
- 230000002745 absorbent Effects 0.000 description 1
- 239000002250 absorbent Substances 0.000 description 1
- 230000003213 activating effect Effects 0.000 description 1
- 238000009303 advanced oxidation process reaction Methods 0.000 description 1
- 239000002154 agricultural waste Substances 0.000 description 1
- 238000003915 air pollution Methods 0.000 description 1
- 238000003556 assay Methods 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 230000003197 catalytic effect Effects 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 239000000356 contaminant Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 201000010099 disease Diseases 0.000 description 1
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 229910001448 ferrous ion Inorganic materials 0.000 description 1
- 239000000706 filtrate Substances 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000005189 flocculation Methods 0.000 description 1
- 230000016615 flocculation Effects 0.000 description 1
- 235000013305 food Nutrition 0.000 description 1
- 125000000524 functional group Chemical group 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 239000003673 groundwater Substances 0.000 description 1
- 231100001261 hazardous Toxicity 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 230000002363 herbicidal effect Effects 0.000 description 1
- 239000004009 herbicide Substances 0.000 description 1
- 239000002917 insecticide Substances 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 229910052745 lead Inorganic materials 0.000 description 1
- 244000005700 microbiome Species 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000008239 natural water Substances 0.000 description 1
- 229910017604 nitric acid Inorganic materials 0.000 description 1
- 150000002894 organic compounds Chemical class 0.000 description 1
- 230000033116 oxidation-reduction process Effects 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 238000006385 ozonation reaction Methods 0.000 description 1
- 238000002161 passivation Methods 0.000 description 1
- 244000052769 pathogen Species 0.000 description 1
- 230000001717 pathogenic effect Effects 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 231100000614 poison Toxicity 0.000 description 1
- 230000007096 poisonous effect Effects 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 150000003071 polychlorinated biphenyls Chemical class 0.000 description 1
- 125000005575 polycyclic aromatic hydrocarbon group Chemical group 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 229910052700 potassium Inorganic materials 0.000 description 1
- 238000013139 quantization Methods 0.000 description 1
- 238000005215 recombination Methods 0.000 description 1
- 230000006798 recombination Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 238000007873 sieving Methods 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 239000004094 surface-active agent Substances 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 229910001428 transition metal ion Inorganic materials 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
Classifications
-
- 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
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Treatment Of Sludge (AREA)
Abstract
The invention discloses a sludge deep dehydration method, which comprises the steps of sequentially adding persulfate, soluble ferrous salt and biomass into sludge, fully reacting, and carrying out filter pressing to obtain a mud cake. The invention compound conditions the sludge by using the activated persulfate as the active oxidation and the biomass as the framework construction body, enhances the strength of sludge flocs, improves the compressibility of the sludge, obviously improves the dehydration performance of the sludge and simultaneously stably passivates heavy metals in the sludge.
Description
Technical field
The invention belongs to sludge dewatering technical field, it is related to activating persulfate advanced oxidation and biomass combined conditioning,
Carry out novel framework construct and improve Sludge Property, realizes deeply dehydrating sludge and minimizing, further relate to the resource of agricultural waste
Change problem.
Background technique
The constituent of sludge is complicated, containing a large amount of pollutant component, if dealt with improperly, is just easy to cause environment
Containing such as Escherichia coli pathogen in secondary pollution, such as sludge, the diffusion of disease is easily led to, endangers Environmental security and the mankind
Health；Contain micro such as polycyclic aromatic hydrocarbon difficult to degrade, herbicide, insecticide, Polychlorinated biphenyls, surfactant in sludge
Hardly degraded organic substance can enter food chain by Transport And Transformation, need to control environmental risk；The unstable organic matter in part in sludge
It is easy to be decomposed, generates H2S、NH3And SO2Equal toxic harmful rottens gas generates air pollution, influences people's quality of life；
Some municipal sludges contain a large amount of heavy metal, without suitable processing disposition, will affect ecological environment security etc..Therefore,
Reasonably carrying out processing disposition to sludge has long-range deep meaning.
" Eco-environmental Issues in China situation bulletin in 2017 " statistics obtains, by the end of the year 2017, National urban sewage treatment energy
Power reaches 1.57 billion cubic meters/day.It is generally believed that 1 ten thousand stere sewage about generates 1.0-2.0 tons of over dry sludge, it means that
The yield of over dry sludge in 2017 is ten thousand tons/year of 573-1146, is calculated by moisture content 80%, and 2017 annual output primary sludge amounts are
Ten thousand tons/year of 2865-5730, this data will continue to rise.It is reported that the year two thousand twenty, the yield of sludge be up to 60,000,000 tons/
Year or more (moisture content 80%).If so huge sludge quantity will will lead to serious environment without reasonable processing disposition
Problem carries out conditioning it is made to be easy dehydration being that the important step before specific resistance to filtration is reduced to reduce sludge volume to sludge
Processing cost.
Common sludge conditioning method mainly has physical modulated logos, chemical conditioning method and a microorganism conditioning method, but there is also
It is insufficient, such as the dosage of PAM is bigger, is easy to produce secondary pollution, and will increase the difficulty of subsequent processing mud cake.With
The progress of expanding economy and technology, poisonous and harmful organic compound is increasingly sophisticated in environment, using strong oxidizing property free radical as base
The high-level oxidation technology (AOTs) of plinth comes into being.Traditional high-level oxidation technology includes Fenton/class Fenton oxidation method, ultraviolet light
Catalytic oxidation and Ozonation, these technologies mainly utilize hydroxyl radical free radical (OH) that organic pollutant is resolved into small point
Sub- substance, or it is broken down into CO2、H2O and inorganic matter, the organic pollutant category that can be degraded is limited, reaction condition is harsh,
Operating cost is higher.
Compared with traditional technology, persulfate high-level oxidation technology is activated with SO4·-For main active group, general feelings
All refer to peroxydisulfate under condition.Activate persulfate (M2S2O8, M=Na, K, NH4) in light, the work of heat, transition metal ions
Under change, over cure acid ion S2O8 2-Activation is decomposed into SO4·-, the use of most common activation method is at present Fe2+Activation is changed
It is as follows to learn equation[82]。
SO4·-Feature is as follows: 1. standard oxidationreduction potential E0=+2.5~+3.1V is more than the extremely strong hydroxyl of oxidisability
Free radical (OH, E0=+1.8~+2.7V)；2. similar with hydroxyl radical free radical degradation of organic substances principle but more stable；3. being applicable in
Range is wide, is all suitable in any condition；4. oxidation-degradable major part organic matter includes the inoxidizable pollution of certain hydroxyls
Object.In short, activation persulfate high-level oxidation technology has many advantages, such as efficient, stable, applied widely, it is widely used in dropping
Solve hazardous contaminant.
How porosity and reduce mud cake compressible that breach of dewatering performance of sludge one of be raising mud cake is improved
Property, therefore the research emphasis that new and effective sludge conditioner is sludge dewatering is developed in conjunction with chemical conditioning method.
Summary of the invention
Lower for current dewatering performance of sludge, content of beary metal is higher in mud cake water content height and removing moisture asks
Topic, the object of the present invention is to provide a kind of deep dehydration method for sludge, pass through activation persulfate active oxidation and biology
Matter improves sludge as framework construction bluk recombination, enhances the intensity of sludge wadding body, improves the compressibility energy of sludge, significantly improve
Stablize passivation Heavy Metals in Sludge while dewatering performance of sludge.
To achieve the goals above, it the present invention provides a kind of deep dehydration method for sludge, was successively added into sludge
Sulfate, soluble divalent iron salt and biomass, sufficiently obtain mud cake through filters pressing after reaction.
Since the charged functional groups of extracellular polymeric determine the surface charge of sludge, persulfuric acid is first added in the present invention
Salt makes mud mixed liquid keep stable state based on homophilic charge is mutually exclusive；Add Fe2+, electricity between mud granule
Lotus repulsion becomes smaller, and sludge system is de- steady, is conducive to sludge dewatering.Fe is added in the ban2+, there is a natural attraction between the sexes, Fe2+Can first it gather with extracellular
It closes object to be combined with each other, adds over cure acid group, oxidable Fe2+It tails off, leads to sludge dewatering decreased effectiveness.
Preferably, the persulfate is peroxydisulfate, in sodium peroxydisulfate, potassium peroxydisulfate and ammonium persulfate extremely
Few one kind, the additive amount of persulfate are 3.33~19.98wt% mud dry weight.
Preferably, the soluble divalent iron salt is selected from green vitriol, iron ammonium sulfate, frerrous chloride and nitric acid
At least one of ferrous iron, the additive amount of soluble divalent iron salt ferrous ions are 0.67~5.03wt% mud dry weight.
Preferably, the biomass through ball milling, drying, sieving handle, partial size be 0.075~0.25mm, preferably 0.075
~0.15mm；Biomass is at least one of rice husk, sawdust.
It is furthermore preferred that the biomass is rice husk, the additive amount of rice husk is 13.3~60wt% mud dry weight.
Preferably, the reaction pH is 1-12, preferably 5-10；Reaction temperature is 25-90 DEG C, preferably 40-80 DEG C.
Fe in the present invention2+/ SPS advanced oxidation processes can keep good oxidation within the temperature range of 25 DEG C -90 DEG C
Reducing power, especially under conditions of 52 DEG C, combined cooker medicament is optimal effect, moisture content of the cake to sludge dehydration process
It is 42%.
A kind of deep dehydration method for sludge preferred scheme of the present invention under the conditions of 40-80 DEG C of temperature, is first added into sludge
Persulfate stirs 5-10min, is then added soluble divalent iron salt, and control solid-to-liquid ratio is 1:10, stirring 5-10min, then plus
Enter biomass, be stirred to react 10-20min, obtains mud cake through filters pressing.
The present invention is improved by the synergistic effect of activation persulfate advanced oxidation and powdered rice hulls through overactivation persulfate
Extracellular polymeric decomposes in sludge wadding body afterwards, destroys flocculation structure fine and close in raw sewage, produces a large amount of hole, extracellular
The combination water that the destruction of polymer wraps up it is converted into Free water, after powdered rice hulls are added, forms sludge-powdered rice hulls skeleton knot
Structure improves the permeability of mud cake, provides channel for the outflow of Free water, improves the compressibility energy of sludge, significantly improves dirt
Mud dewatering.
Compared with prior art, the invention has the following advantages:
(1) sludge is after overactivation persulfate-powdered rice hulls combined cooker, the compressible coefficient of the mud cake that filters pressing obtains by
1.01 are reduced to 0.68, and resistance to compression is strong.
(2) sludge is after overactivation persulfate-powdered rice hulls combined cooker, and the moisture content of the cake that filters pressing obtains is 40~
48%, realize the deep dehydration of sludge.
(3) Leaching of Heavy Metals content is lower in the present invention treated mud cake, and operating cost is low, subtracts realizing sludge
Innoxious while quantization, mud cake can be used for producing cement, brickmaking or landfill disposal after dehydration.
Detailed description of the invention
Fig. 1 is the influence diagram after the embodiment of the present invention 1~3 and comparative example 1~4 improve to sludge SRF and CST reduced rate.
Fig. 2 is the influence diagram to mud cake compressible coefficient after the embodiment of the present invention 1~3 and the conditioning of comparative example 1~4.
Fig. 3 is the influence diagram after the embodiment of the present invention 1~3 and comparative example 1~4 improve to moisture content of the cake.
Specific embodiment
Below with reference to specific embodiment the present invention is described further, but protection scope of the present invention and not only limit
In this.
The drying of sludge and the crushing of biomass rice husk are all made of conventional method.
Embodiment 1
A kind of deeply dehydrating sludge technology of the invention, raw material are as follows: sludge, ferrous sulfate, sodium peroxydisulfate, rice husk and
Water.It is specific as follows that it improves step:
(1) dry rice husk is put into ball mill and 10min is ground with 3500r/min revolving speed, dried to get rice husk is arrived
Powder；
(2) powdered rice hulls are passed through into square hole screen, obtains the powdered rice hulls that partial size is 0.075-0.15mm；
At (3) 25 DEG C, the sodium peroxydisulfate of 15.2wt% mud dry weight is added, stirs 5min, 4.6wt% sludge is then added
The Fe of dry weight2+, solid-to-liquid ratio 1:10 is controlled, 10min is stirred；
(4) powdered rice hulls of 33.3wt% mud dry weight are added, stir 10min at 25 DEG C；
(5) sludge enters plate and frame filter press 0.5h, obtains mud cake.
Through detecting, the moisture content of the cake is 48%.
Embodiment 2
A kind of deeply dehydrating sludge technology of the invention, raw material are as follows: sludge, ferrous sulfate, potassium peroxydisulfate (SPS), rice
Shell and water.It is specific as follows that it improves step:
(1) dry rice husk is put into ball mill and 10min is ground with 3500r/min revolving speed, dried to get rice husk is arrived
Powder；
(2) powdered rice hulls are passed through into square hole screen, obtains the powdered rice hulls that partial size is 0.075-0.15mm；
At (3) 52 DEG C, the potassium peroxydisulfate of 15.2wt% mud dry weight is added, stirs 5min, 4.6wt% sludge is then added
The Fe of dry weight2+, solid-to-liquid ratio 1:10 is controlled, 10min is stirred；
(4) powdered rice hulls of 33.3wt% mud dry weight are added, stir 10min at 52 DEG C；
(5) sludge enters plate and frame filter press 0.5h, obtains mud cake.
Through detecting, the moisture content of the cake is 42%.
Embodiment 3
A kind of deeply dehydrating sludge technology of the invention, raw material are as follows: sludge, ferrous sulfate, potassium peroxydisulfate, rice husk and
Water.It is specific as follows that it improves step:
(1) dry rice husk is put into ball mill and 10min is ground with 3500r/min revolving speed, dried to get rice husk is arrived
Powder；
(2) powdered rice hulls are passed through into square hole screen, obtains the powdered rice hulls that partial size is 0.075-0.15mm；
At (3) 80 DEG C, the potassium peroxydisulfate of 15.2wt% mud dry weight is added, stirs 5min, 4.6wt% sludge is then added
The Fe of dry weight2+, solid-to-liquid ratio 1:10 is controlled, 10min is stirred；
(4) powdered rice hulls of 33.3wt% mud dry weight are added, stir 10min at 80 DEG C；
(5) sludge enters plate and frame filter press 0.5h, obtains mud cake.
Through detecting, the moisture content of the cake is 45%.
Comparative example 1
A kind of deeply dehydrating sludge technology of the invention, raw material are as follows: sludge, ferrous sulfate, potassium peroxydisulfate (SPS), rice
Shell and water.It is specific as follows that it improves step:
(1) dry rice husk is put into ball mill and 10min is ground with 3500r/min revolving speed, dried to get rice husk is arrived
Powder；
(2) powdered rice hulls are passed through into square hole screen, obtains the powdered rice hulls that partial size is 0.075-0.15mm；
At (3) 25 DEG C, the Fe of 4.6wt% mud dry weight is added2+, 5min is stirred, 15.2wt% mud dry weight is then added
Potassium peroxydisulfate, control solid-to-liquid ratio 1:10, stir 10min；
(4) powdered rice hulls of 33.3wt% mud dry weight are added, stir 10min at 25 DEG C；
(5) sludge enters plate and frame filter press 0.5h, obtains mud cake.
Through detecting, the moisture content of the cake is 60%.
Comparative example 2
Compared with Example 1, difference is, does not add powdered rice hulls.
Through detecting, the moisture content of the cake is 62%.
Comparative example 3
Compared with Example 1, difference is, does not add sodium peroxydisulfate and ferrous sulfate.
Through detecting, the moisture content of the cake is 90%.
Comparative example 4
Blank assay does not add sodium peroxydisulfate, ferrous sulfate and powdered rice hulls.
Through detecting, the moisture content of the cake is 92%.
The composition detection result of sludge, SRF (sludge specific resistance) and CST (sludge hair in Examples 1 to 3 and comparative example 1~4
Thin absorbent time) reduced rate, compressible index and dewatering it is as shown in Figures 1 to 3.
As shown in Figure 1, CST reduced rate is only 12.6% when only adding powdered rice hulls, it is basic without improving dehydration property
Energy；After using activation persulfate advanced oxidation conditioning, CST reduced rate is 77.2%；And the present invention is using activation persulfuric acid
After salt-powdered rice hulls combined cooker, CST reduced rate increases to 90% or so, and synergy is obvious.
The SRF of raw sewage is 5.98 × 1013M/kg belongs to difficult filter sludge, after addition powdered rice hulls individually improve, SRF
It is reduced to 5.01 × 1013M/kg does not cause the variation of essence；After using activation persulfate conditioning, SRF is reduced to 1.02 ×
1013M/kg, reduced rate 79.6%；And after the present invention is using activation persulfate-powdered rice hulls combined cooker, SRF is reduced to
0.32×1013M/kg, reduced rate 94.6% become being easy filter sludge, and synergy is obvious.As a result illustrate, activate over cure
Hydrochlorate-powdered rice hulls combined cooker can significantly improve the strainability and dewatering of sludge.
As shown in Fig. 2, the compressible coefficient of mud cake is by 1.01 drops after overactivation persulfate-powdered rice hulls combined cooker
Down to 0.68, resistance to compression is significantly increased.
From the figure 3, it may be seen that raw sewage and by the sludge that powdered rice hulls individually improve after filters pressing 10min, moisture content of the cake is still
90% or so, during filters pressing, it is observed visually and is flowed out substantially without filtrate；After the conditioning of overactivation persulfate, mud
Cake moisture content is reduced to 62%；And after the present invention is using activation persulfate-powdered rice hulls combined cooker, at 25 DEG C, 52 DEG C and 80
At DEG C, moisture content of the cake is respectively 48%, 42% and 45%.The above results show compound through overactivation persulfate-powdered rice hulls
After conditioning, synergy is obvious, can significantly change the dewatering of sludge.
Content such as 1 institute of table that sludge passes through target heavy metal (Cu, Pb, Cd, Zn, Cd) in mud cake after different condition conditioning
Show.
Content of beary metal (mg/kg) in mud cake after 1 sludge conditioning of table
Leaching of Heavy Metals test method in Examples 1 to 3 and comparative example 1~4: after reference standard HJ557-2010 is to conditioning
Mud cake carry out leaching test, and according to " groundwater quality standard " (GB/T14848-93) and " integrated wastewater discharge standard "
(GB8978-2002) mud cake is evaluated in transfer process to the potential risk of natural water, Leaching of Heavy Metals value is shown in Table 2.
2 mud cake Leaching of Heavy Metals test value (mg/L) of table
Claims (7)
1. a kind of deep dehydration method for sludge, it is characterised in that: persulfate, soluble divalent iron salt are successively added into sludge
And biomass, sufficiently mud cake is obtained through filters pressing after reaction.
2. deep dehydration method for sludge according to claim 1, it is characterised in that: the persulfate is peroxy-disulfuric acid
Salt, at least one of selected from sodium peroxydisulfate, potassium peroxydisulfate and ammonium persulfate, the additive amount of persulfate is 3.33~
19.98wt% mud dry weight.
3. deep dehydration method for sludge according to claim 1, it is characterised in that: the solubility divalent iron salt is selected from seven
At least one of ferrous sulfate hydrate, iron ammonium sulfate, frerrous chloride and ferrous nitrate, in soluble divalent iron salt ferrous iron from
The additive amount of son is 0.67~5.03wt% mud dry weight.
4. deep dehydration method for sludge according to claim 1, it is characterised in that: the biomass is through ball milling, drying, mistake
Sieve processing, partial size are 0.075~0.25mm.
5. deep dehydration method for sludge according to claim 4, it is characterised in that: the biomass is rice husk, rice husk
Additive amount is 13.3~60%wt mud dry weight.
6. deep dehydration method for sludge according to claim 1, it is characterised in that: the reaction pH is 1-12；Reaction temperature
Degree is 25-90 DEG C.
7. deep dehydration method for sludge according to claim 1-6, it is characterised in that: in 40-80 DEG C of item of temperature
Under part, persulfate is first added into sludge, stirs 5-10min, soluble divalent iron salt is then added, control solid-to-liquid ratio is 1:
10,5-10min is stirred, biomass is added, is stirred to react 10-20min, obtain mud cake through filters pressing.
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| CN111977939A (en) * | 2020-09-16 | 2020-11-24 | 西安理工大学 | Method for treating excess sludge dehydration by electrocatalysis coupling sulfate radical free radical |
| CN112430146A (en) * | 2020-11-06 | 2021-03-02 | 湖北宸扬生物环保科技有限公司 | Method for sludge dewatering and synchronous production of solid-liquid nitrogen fertilizer |
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| CN114436499A (en) * | 2022-01-24 | 2022-05-06 | 济南大学 | Method for conditioning excess sludge by aluminum sludge in cooperation with advanced oxidation |
| CN115041166A (en) * | 2022-05-24 | 2022-09-13 | 浙江科技学院 | A kind of heterogeneous persulfate catalyst and its preparation method and application |
| CN115301714A (en) * | 2022-08-11 | 2022-11-08 | 徐州振丰新型墙体材料有限公司 | Method for making brick by harmless sintering of polluted soil |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111977939A (en) * | 2020-09-16 | 2020-11-24 | 西安理工大学 | Method for treating excess sludge dehydration by electrocatalysis coupling sulfate radical free radical |
| CN112430146A (en) * | 2020-11-06 | 2021-03-02 | 湖北宸扬生物环保科技有限公司 | Method for sludge dewatering and synchronous production of solid-liquid nitrogen fertilizer |
| CN112551848A (en) * | 2020-11-20 | 2021-03-26 | 武汉科技大学 | Conditioner based on sludge oxidation and skeleton construction and sludge conditioning method |
| CN114436499A (en) * | 2022-01-24 | 2022-05-06 | 济南大学 | Method for conditioning excess sludge by aluminum sludge in cooperation with advanced oxidation |
| CN115041166A (en) * | 2022-05-24 | 2022-09-13 | 浙江科技学院 | A kind of heterogeneous persulfate catalyst and its preparation method and application |
| CN115301714A (en) * | 2022-08-11 | 2022-11-08 | 徐州振丰新型墙体材料有限公司 | Method for making brick by harmless sintering of polluted soil |
| CN115301714B (en) * | 2022-08-11 | 2023-12-01 | 徐州振丰新型墙体材料有限公司 | Method for making bricks by harmless sintering of polluted soil |
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