CN109250878A - A method of Heavy Metals in Sludge is removed using free nitrous acid - Google Patents

A method of Heavy Metals in Sludge is removed using free nitrous acid Download PDF

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Publication number
CN109250878A
CN109250878A CN201811145082.3A CN201811145082A CN109250878A CN 109250878 A CN109250878 A CN 109250878A CN 201811145082 A CN201811145082 A CN 201811145082A CN 109250878 A CN109250878 A CN 109250878A
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sludge
heavy metals
nitrous acid
free nitrous
filtrate
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余震
王跃强
汤佳
刘晓明
周顺桂
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Guangdong Institute of Eco Environment and Soil Sciences
Guangdong Institute of Eco Environmental Science and Technology
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Guangdong Institute of Eco Environmental Science and Technology
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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
    • 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
    • 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
    • C02F11/127—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering by centrifugation
    • 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
    • C02F2101/00—Nature of the contaminant
    • C02F2101/10—Inorganic compounds
    • C02F2101/20—Heavy metals or heavy metal compounds
    • 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

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  • 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 kind of methods using free nitrous acid removal Heavy Metals in Sludge comprising following steps: 1) sludge is acidified；2) dissociate nitrite reaction；3) sludge dewatering；4) in filtrate heavy metal removal.The present invention destroys the extracellular polymeric in sludge and dissolution microbial cell using free nitrous acid, significantly improves the dissolution efficiency of Heavy Metals in Sludge especially organically combine state heavy metal, good to the removal effect of Heavy Metals in Sludge.The present invention can also be used as the conditioning technique before sludge dewatering, sludge settling property can be significantly improved, kill sludge pathogen etc., dispose and utilize providing advantage for sludge subsequent processing.

Description

A method of Heavy Metals in Sludge is removed using free nitrous acid
Technical field
The present invention relates to a kind of methods using free nitrous acid removal Heavy Metals in Sludge.
Background technique
With the quickening of Chinese Urbanization and process of industrialization, the yield of municipal sludge increasingly increases, it is contemplated that the year two thousand twenty is arrived, The annual output of China's municipal sludge will break through 60,000,000 tons.Currently, most municipal sludge is not stabilized, is innoxious Processing disposition is usually intended for municipal waste plants and carries out simple landfill or throw aside, counteracts sewage treatment plant's purification significantly The effect of environment, seriously constrains the sound development of sewage disposal cause, and city ring is returned in the disposition lack of standardization of municipal sludge Border brings security risk.Contain the nutrients such as a large amount of organic matter and N, P, K abundant in municipal sludge, is that can be used as What fertilizer or soil additive were used, but since municipal sludge is enriched in sewage disposal process 50%~80% huge sum of money Belong to, heavy metal seriously constrains sludge landfill characteristics.
A large number of studies show that the heavy metal in sludge can be complexed with organic components such as extracellular polymerics (EPS), so removal Difficulty it is larger.Currently, the method for removal Heavy Metals in Sludge mainly has absorption method, electro reclamation, bioanalysis and chemical method Deng their advantage and disadvantage are as follows:
Absorption method is to be separated using the substance with special construction or chemical component except the heavy metal in sludge, the party Method is preferable to the removal effect of heavy metal, but specificity is stronger, and processing cost is higher, it is difficult to large-scale engineering applications；
Electro reclamation is by electrodialysis, electromigration and electrophoresis heavy metal ion to be occurred fixed using extra electric field To movement, and removing is accumulated near electrode, this method is preferable to the removal effect of heavy metal, but the device is complicated for needs, dimension Protect at high cost, and sludge quality has larger impact to its removal effect；
Bioanalysis generally refers to bioleaching, that is, utilizes the biological oxidation and production of the specified microorganisms such as acidophilic thiobacillus Acid effect leaches into the heavy metal separation in sludge solid phase in liquid phase, and by being separated by solid-liquid separation removal Heavy Metals in Sludge, should Method low, advantages of environment protection with processing cost, but long processing period, removal efficiency are lower；
Chemical method is usually that sulfuric acid, hydrochloric acid or nitric acid is used to reduce the acidity (pH) of sludge, makes to adsorb or be fixed on sludge In heavy metal be dissolved out in the form of ionic state, then by be separated by solid-liquid separation so that heavy metal is transferred to liquid phase from sludge solid phase In, to achieve the purpose that remove Heavy Metals in Sludge, this method removal Heavy Metals in Sludge works well, but acidification sludge And the acid neutralized in leachate will consume a large amount of chemical reagent, it is costly.Such as: CN 103183459A discloses one The method of heavy metal, this method need the pH value of sludge being adjusted to 0.3~0.5 in kind removal sludge of sewage treatment plant, sulfuric acid Consumption it is big, and handle time it is longer.
Summary of the invention
The purpose of the present invention is to provide a kind of methods using free nitrous acid removal Heavy Metals in Sludge.
The technical solution used in the present invention is:
A method of Heavy Metals in Sludge is removed using free nitrous acid, comprising the following steps:
1) sludge is acidified: the solid content of sludge being adjusted to 1%~3%, pH value and is adjusted to 2.0~2.5, then is vibrated Culture；
2) dissociate nitrite reaction: water-soluble nitrite being added in the processed sludge of step 1), then is vibrated Culture；
3) sludge dewatering: the processed sludge of step 2) is centrifuged or is filtered, filter residue and filtrate are obtained；
4) in filtrate heavy metal removal: the precipitating for carrying out heavy metal is added in the filtrate of step 3) in lime, then is carried out Centrifugation or filtering.
Using the pH value of the sulfuric acid conditioning of mud of mass fraction 10%~15% in step 1).
The time of the step 1) shaken cultivation is 0.5~1h.
Step 1) the shaken cultivation carries out under conditions of room temperature, oscillator 150~250r/min of revolving speed.
Step 2) the water-soluble nitrite is at least one of sodium nitrite, potassium nitrite.
The concentration of free nitrous acid is 10~60mg/L in sludge after the water-soluble nitrite of step 2) addition.
The time of the step 2) shaken cultivation is 4~6h.
Step 2) the shaken cultivation carries out under conditions of room temperature, oscillator 150~250r/min of revolving speed.
The moisture content of the step 3) filter residue is 60%~80%.
Additive amount of the step 4) lime in filtrate is 0.5~2.0g/L.
The beneficial effects of the present invention are: the present invention is using free nitrous acid come the extracellular polymeric destroyed in sludge and dissolution Microbial cell significantly improves the dissolution efficiency of Heavy Metals in Sludge especially organically combine state heavy metal, to weight in sludge The removal effect of metal is good.The present invention can also be used as the conditioning technique before sludge dewatering, can significantly improve sludge settling Can, kill sludge pathogen etc., dispose and utilize providing advantage for sludge subsequent processing.
Specific embodiment
A method of Heavy Metals in Sludge is removed using free nitrous acid, comprising the following steps:
1) sludge is acidified: the solid content of sludge being adjusted to 1%~3%, pH value and is adjusted to 2.0~2.5, then is vibrated Culture；
2) dissociate nitrite reaction: water-soluble nitrite being added in the processed sludge of step 1), then is vibrated Culture；
3) sludge dewatering: the processed sludge of step 2) is centrifuged or is filtered, filter residue and filtrate are obtained；
4) in filtrate heavy metal removal: the precipitating for carrying out heavy metal is added in the filtrate of step 3) in lime, then is carried out Centrifugation or filtering.
Preferably, using the pH value of the sulfuric acid conditioning of mud of mass fraction 10%~15% in step 1).
Preferably, the time of the step 1) shaken cultivation is 0.5~1h.
Preferably, the step 1) shaken cultivation carries out under conditions of room temperature, oscillator 150~250r/min of revolving speed.
Preferably, step 2) the water-soluble nitrite is at least one of sodium nitrite, potassium nitrite.
It is further preferred that step 2) the water-soluble nitrite is sodium nitrite.
Preferably, the concentration of free nitrous acid is 10~60mg/L in sludge after the water-soluble nitrite of step 2) addition.
The concentration of free nitrous acid is calculated according to the following formula: SFNA(Ka × 10=S/pH), Ka=e-2300/(270+t), Wherein, SFNAFor the concentration (unit mg/L) for the nitrous acid that dissociates in reaction system, S is NO in reaction system2 -Concentration (unit For the temperature that mg/L), t are when reacting (unit is DEG C).
Preferably, the time of the step 2) shaken cultivation is 4~6h.
Preferably, the step 2) shaken cultivation carries out under conditions of room temperature, oscillator 150~250r/min of revolving speed.
Preferably, the moisture content of the step 3) filter residue is 60%~80%.
Preferably, additive amount of the step 4) lime in filtrate is 0.5~2.0g/L.
The present invention will be further explained combined with specific embodiments below and explanation.
Embodiment 1:
It is the thickened sludge that Guangzhou sewage treatment plant generates for examination mud sample, the physicochemical property of the sludge is as follows: PH is 6.36 ± 0.21, and oxidation-reduction potential (ORP) is (36.46 ± 0.24) mV, and moisture content is (97.86 ± 0.18) %, always Solid content (TS) is (32.24 ± 0.43) g/L, and volatile solid content (VSS) is (14.68 ± 0.11) g/L, heavy metal Cu, Zn, Pb, Cd, Mn and Co content be respectively (421.78 ± 3.65) mg/kg, (825.56 ± 4.68) mg/kg, (102.58 ± 0.32) mg/kg, (5.96 ± 0.12) mg/kg, (425.54 ± 4.58) mg/kg and (6.58 ± 0.25) mg/kg.
A method of Heavy Metals in Sludge is removed using free nitrous acid, comprising the following steps:
1) sludge is acidified: the solid content of sludge is adjusted to 2%, then the pH of the sulfuric acid conditioning of mud with mass fraction 10% Value is to 2.5, then controlling oscillator revolving speed is 150r/min, carries out 1h shaken cultivation at 30 DEG C；
2) dissociate nitrite reaction: sodium nitrite is added in the processed sludge of step 1) to (additive amount is 63.49mg/L), then oscillator revolving speed is controlled as 150r/min, 6h shaken cultivation is carried out at 30 DEG C, after tested, a huge sum of money in sludge The dissolution rate for belonging to Cu, Zn, Pb, Cd, Mn and Co is respectively 39.58%, 75.87%, 3.98%, 68.54%, 35.68%, 30.56% (it is simple to carry out sludge acidification as control, without the nitrite reaction that dissociates, Heavy Metals in Sludge Cu, Zn, Pb, The dissolution rate of Cd, Mn and Co is respectively 6.85%, 70.89%, 2.98%, 50.39%, 34.59%, 28.79%)；
3) sludge dewatering: centrifugal dehydration is carried out to the processed sludge of step 2), obtains filter residue (moisture content 75%) and filter Liquid；
4) in filtrate heavy metal removal: by lime be added in the filtrate of step 3) (additive amount 1.0g/L) carry out weight The precipitating of metal, then be centrifuged, realize the removal of heavy metal in filtrate.
Embodiment 2:
It is identical for examination mud sample and embodiment 1.
A method of Heavy Metals in Sludge is removed using free nitrous acid, comprising the following steps:
1) sludge is acidified: the solid content of sludge is adjusted to 1%, then the pH of the sulfuric acid conditioning of mud with mass fraction 15% Value is to 2.0, then controlling oscillator revolving speed is 200r/min, carries out 0.5h shaken cultivation at 30 DEG C；
2) dissociate nitrite reaction: sodium nitrite is added in the processed sludge of step 1) to (additive amount is 60.50mg/L), then oscillator revolving speed is controlled as 200r/min, 4h shaken cultivation is carried out at 30 DEG C, after tested, a huge sum of money in sludge The dissolution rate for belonging to Cu, Zn, Pb, Cd, Mn and Co is respectively 44.59%, 80.35%, 4.59%, 78.59%, 37.86%, 32.69% (it is simple to carry out sludge acidification as control, without the nitrite reaction that dissociates, Heavy Metals in Sludge Cu, Zn, Pb, The dissolution rate of Cd, Mn and Co is respectively 10.58%, 80.98%, 3.05%, 53.89%, 36.75%, 30.25%)；
3) sludge dewatering: centrifugal dehydration is carried out to the processed sludge of step 2), obtains filter residue (moisture content 71%) and filter Liquid；
4) in filtrate heavy metal removal: by lime be added in the filtrate of step 3) (additive amount 0.5g/L) carry out weight The precipitating of metal, then be centrifuged, realize the removal of heavy metal in filtrate.
Embodiment 3:
It is identical for examination mud sample and embodiment 1.
A method of Heavy Metals in Sludge is removed using free nitrous acid, comprising the following steps:
1) sludge is acidified: the solid content of sludge is adjusted to 2%, then the pH of the sulfuric acid conditioning of mud with mass fraction 10% Value is to 2.5, then controlling oscillator revolving speed is 200r/min, carries out 1h shaken cultivation at 30 DEG C；
2) dissociate nitrite reaction: sodium nitrite is added in the processed sludge of step 1) to (additive amount is 126.98mg/L), then oscillator revolving speed is controlled as 200r/min, 5h shaken cultivation is carried out at 30 DEG C, after tested, a huge sum of money in sludge The dissolution rate for belonging to Cu, Zn, Pb, Cd, Mn and Co is respectively 41.59%, 79.86%, 4.01%, 69.48%, 36.14%, 31.52%；
3) sludge dewatering: centrifugal dehydration is carried out to the processed sludge of step 2), obtains filter residue (moisture content 74%) and filter Liquid；
4) in filtrate heavy metal removal: by lime be added in the filtrate of step 3) (additive amount 0.8g/L) carry out weight The precipitating of metal, then be centrifuged, realize the removal of heavy metal in filtrate.
Embodiment 4:
It is identical for examination mud sample and embodiment 1.
A method of Heavy Metals in Sludge is removed using free nitrous acid, comprising the following steps:
1) sludge is acidified: the solid content of sludge is adjusted to 1%, then the pH of the sulfuric acid conditioning of mud with mass fraction 15% Value is to 2.0, then controlling oscillator revolving speed is 200r/min, carries out 1h shaken cultivation at 30 DEG C；
2) dissociate nitrite reaction: sodium nitrite is added in the processed sludge of step 1) to (additive amount is 120.99mg/L), then oscillator revolving speed is controlled as 200r/min, 4h shaken cultivation is carried out at 30 DEG C, after tested, a huge sum of money in sludge The dissolution rate for belonging to Cu, Zn, Pb, Cd, Mn and Co is respectively 46.89%, 84.52%, 4.89%, 80.15%, 38.48%, 33.11%；
3) sludge dewatering: centrifugal dehydration is carried out to the processed sludge of step 2), obtains filter residue (moisture content 69%) and filter Liquid；
4) in filtrate heavy metal removal: by lime be added in the filtrate of step 3) (additive amount 2.0g/L) carry out weight The precipitating of metal, then be centrifuged, realize the removal of heavy metal in filtrate.
Embodiment 5:
It is sludge caused by city domestic sewage sequencing batch active sludge, the physics and chemistry of the sludge for examination mud sample Matter is as follows: pH be 6.67 ± 0.12, oxidation-reduction potential (ORP) be (28.96 ± 12) mV, moisture content be (96.85 ± 0.32) %, total solids content (TS) are (32.85 ± 0.42) g/L, and volatile solid content (VSS) is (15.45 ± 0.21) g/ L, heavy metal Cu, Zn, Pb, Cd, Mn and Co content be respectively (130.52 ± 1.54) mg/kg, (1432.95 ± 3.25) mg/kg, (70.15 ± 0.21) mg/kg, (1.12 ± 0.05) mg/kg, (400.12 ± 2.58) mg/kg and (5.06 ± 0.15) mg/kg.
A method of Heavy Metals in Sludge is removed using free nitrous acid, comprising the following steps:
1) sludge is acidified: the solid content of sludge is adjusted to 3%, then the pH of the sulfuric acid conditioning of mud with mass fraction 15% Value is to 2.5, then controlling oscillator revolving speed is 200r/min, carries out 1h shaken cultivation at 25 DEG C；
2) dissociate nitrite reaction: sodium nitrite is added in the processed sludge of step 1) to (additive amount is 125.91mg/L), then oscillator revolving speed is controlled as 200r/min, 5h shaken cultivation is carried out at 25 DEG C, after tested, a huge sum of money in sludge The dissolution rate for belonging to Cu, Zn, Pb, Cd, Mn and Co is respectively 40.59%, 69.98%, 4.35%, 68.69%, 36.54%, 26.58% (it is simple to carry out sludge acidification as control, without the nitrite reaction that dissociates, Heavy Metals in Sludge Cu, Zn, Pb, The dissolution rate of Cd, Mn and Co is respectively 26.59%, 65.59%, 3.59%, 38.59%, 35.69%, 25.96%)；
3) sludge dewatering: centrifugal dehydration is carried out to the processed sludge of step 2), obtains filter residue (moisture content 72%) and filter Liquid；
4) in filtrate heavy metal removal: by lime be added in the filtrate of step 3) (additive amount 0.7g/L) carry out weight The precipitating of metal, then be centrifuged, realize the removal of heavy metal in filtrate.
Embodiment 6:
It is identical for examination mud sample and embodiment 5.
A method of Heavy Metals in Sludge is removed using free nitrous acid, comprising the following steps:
1) sludge is acidified: the solid content of sludge is adjusted to 2%, then the pH of the sulfuric acid conditioning of mud with mass fraction 10% Value is to 2.0, then controlling oscillator revolving speed is 250r/min, carries out 1h shaken cultivation at 30 DEG C；
2) dissociate nitrite reaction: sodium nitrite is added in the processed sludge of step 1) to (additive amount is 60.33mg/L), then oscillator revolving speed is controlled as 200r/min, 4h shaken cultivation is carried out at 30 DEG C, after tested, a huge sum of money in sludge The dissolution rate for belonging to Cu, Zn, Pb, Cd, Mn and Co is respectively 50.12%, 75.98%, 5.69%, 70.89%, 38.96%, 28.79% (it is simple to carry out sludge acidification as control, without the nitrite reaction that dissociates, Heavy Metals in Sludge Cu, Zn, Pb, The dissolution rate of Cd, Mn and Co is respectively 30.89%, 70.26%, 5.53%, 45.86%, 37.68%, 28.56%)；
3) sludge dewatering: centrifugal dehydration is carried out to the processed sludge of step 2), obtains filter residue (moisture content 69%) and filter Liquid；
4) in filtrate heavy metal removal: by lime be added in the filtrate of step 3) (additive amount 1.2g/L) carry out weight The precipitating of metal, then be centrifuged, realize the removal of heavy metal in filtrate.
Embodiment 7:
It is identical for examination mud sample and embodiment 5.
A method of Heavy Metals in Sludge is removed using free nitrous acid, comprising the following steps:
1) sludge is acidified: the solid content of sludge is adjusted to 3%, then the pH of the sulfuric acid conditioning of mud with mass fraction 15% Value is to 2.5, then controlling oscillator revolving speed is 250r/min, carries out 0.5h shaken cultivation at 25 DEG C；
2) dissociate nitrite reaction: sodium nitrite is added in the processed sludge of step 1) to (additive amount is 62.95mg/L), then oscillator revolving speed is controlled as 250r/min, 6h shaken cultivation is carried out at 25 DEG C, after tested, a huge sum of money in sludge The dissolution rate for belonging to Cu, Zn, Pb, Cd, Mn and Co is respectively 38.59%, 68.59%, 3.98%, 63.53%, 35.99%, 25.89%；
3) sludge dewatering: centrifugal dehydration is carried out to the processed sludge of step 2), obtains filter residue (moisture content 70%) and filter Liquid；
4) in filtrate heavy metal removal: by lime be added in the filtrate of step 3) (additive amount 1.0g/L) carry out weight The precipitating of metal, then be centrifuged, realize the removal of heavy metal in filtrate.
Embodiment 8:
It is identical for examination mud sample and embodiment 5.
A method of Heavy Metals in Sludge is removed using free nitrous acid, comprising the following steps:
1) sludge is acidified: the solid content of sludge is adjusted to 2%, then the pH of the sulfuric acid conditioning of mud with mass fraction 10% Value is to 2.0, then controlling oscillator revolving speed is 250r/min, carries out 0.5h shaken cultivation at 30 DEG C；
2) dissociate nitrite reaction: sodium nitrite is added in the processed sludge of step 1) to (additive amount is 120.65mg/L), then oscillator revolving speed is controlled as 200r/min, 6h shaken cultivation is carried out at 30 DEG C, after tested, a huge sum of money in sludge The dissolution rate for belonging to Cu, Zn, Pb, Cd, Mn and Co is respectively 52.89%, 81.96%, 5.98%, 75.98%, 39.89%, 29.15%；
3) sludge dewatering: centrifugal dehydration is carried out to the processed sludge of step 2), obtains filter residue (moisture content 71%) and filter Liquid；
4) in filtrate heavy metal removal: by lime be added in the filtrate of step 3) (additive amount 1.5g/L) carry out weight The precipitating of metal, then be centrifuged, realize the removal of heavy metal in filtrate.
The above embodiment is a preferred embodiment of the present invention, but embodiments of the present invention are not by above-described embodiment Limitation, other any changes, modifications, substitutions, combinations, simplifications made without departing from the spirit and principles of the present invention, It should be equivalent substitute mode, be included within the scope of the present invention.

Claims (10)

1. a kind of method using free nitrous acid removal Heavy Metals in Sludge, it is characterised in that: the following steps are included:
1) sludge is acidified: the solid content of sludge being adjusted to 1%~3%, pH value and is adjusted to 2.0~2.5, then carries out oscillation training It supports；
2) dissociate nitrite reaction: water-soluble nitrite being added in the processed sludge of step 1), then carries out shaken cultivation；
3) sludge dewatering: the processed sludge of step 2) is centrifuged or is filtered, filter residue and filtrate are obtained；
4) in filtrate heavy metal removal: the precipitating for carrying out heavy metal is added in the filtrate of step 3) in lime, then is centrifuged Or filtering.
2. the method according to claim 1 using free nitrous acid removal Heavy Metals in Sludge, it is characterised in that: step 1) using the pH value of the sulfuric acid conditioning of mud of mass fraction 10%~15% in.
3. the method according to claim 1 or 2 using free nitrous acid removal Heavy Metals in Sludge, it is characterised in that: The time of the step 1) shaken cultivation is 0.5~1h.
4. the method according to claim 1 or 2 using free nitrous acid removal Heavy Metals in Sludge, it is characterised in that: Step 1) the shaken cultivation carries out under conditions of room temperature, oscillator 150~250r/min of revolving speed.
5. the method according to claim 1 using free nitrous acid removal Heavy Metals in Sludge, it is characterised in that: step 2) the water-soluble nitrite is at least one of sodium nitrite, potassium nitrite.
6. utilizing the method for free nitrous acid removal Heavy Metals in Sludge according to claim 1 or 5, it is characterised in that: The concentration of free nitrous acid is 10~60mg/L in sludge after the water-soluble nitrite of step 2) addition.
7. utilizing the method for free nitrous acid removal Heavy Metals in Sludge according to claim 1 or 5, it is characterised in that: The time of the step 2) shaken cultivation is 4~6h.
8. utilizing the method for free nitrous acid removal Heavy Metals in Sludge according to claim 1 or 5, it is characterised in that: Step 2) the shaken cultivation carries out under conditions of room temperature, oscillator 150~250r/min of revolving speed.
9. the method according to claim 1 using free nitrous acid removal Heavy Metals in Sludge, it is characterised in that: step 3) moisture content of the filter residue is 60%~80%.
10. the method according to claim 1 using free nitrous acid removal Heavy Metals in Sludge, it is characterised in that: step Additive amount of rapid 4) the described lime in filtrate is 0.5~2.0g/L.
CN201811145082.3A 2018-09-29 2018-09-29 A method of Heavy Metals in Sludge is removed using free nitrous acid Pending CN109250878A (en)

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Cited By (3)

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CN110818217A (en) * 2019-11-28 2020-02-21 湖南大学 Method for strengthening anaerobic digestion of excess sludge by combined pretreatment of freezing and free nitrous acid
CN112321132A (en) * 2020-12-04 2021-02-05 河南工程学院 Municipal sludge treatment and utilization method
CN113461284A (en) * 2021-07-30 2021-10-01 北京石油化工学院 Municipal sludge treatment method for nitrate-enhanced pyrohydrolysis

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