CN107803400A - The compost method of petroleum hydrocarbon contaminated soil is repaired using biogas slurry - Google Patents

The compost method of petroleum hydrocarbon contaminated soil is repaired using biogas slurry Download PDF

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Publication number
CN107803400A
CN107803400A CN201711051065.9A CN201711051065A CN107803400A CN 107803400 A CN107803400 A CN 107803400A CN 201711051065 A CN201711051065 A CN 201711051065A CN 107803400 A CN107803400 A CN 107803400A
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China
Prior art keywords
biogas slurry
contaminated soil
petroleum hydrocarbon
content
compost
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CN201711051065.9A
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CN107803400B (en
Inventor
何小松
赵昕宇
席北斗
王晓伟
李丹
张慧
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Chinese Research Academy of Environmental Sciences
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Chinese Research Academy of Environmental Sciences
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B09DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
    • B09CRECLAMATION OF CONTAMINATED SOIL
    • B09C1/00Reclamation of contaminated soil
    • B09C1/10Reclamation of contaminated soil microbiologically, biologically or by using enzymes

Abstract

A kind of compost method that petroleum hydrocarbon contaminated soil is repaired using biogas slurry, is comprised the following steps:(1) biogas slurry is added in petroleum hydrocarbon contaminated soil, and is sufficiently stirred;(2) compost under field conditions (factors), keeps the skin wet, regular turning.This method can realize the recycling of biogas slurry after anaerobic fermentation, reduce its processing cost, realize that recycling reduces petroleum hydrocarbons, lift soil fertility, reduce its toxicity.The advantages that the method is easy to operate, degradation efficiency is high, effect on environment is low, non-secondary pollution.

Description

The compost method of petroleum hydrocarbon contaminated soil is repaired using biogas slurry
Technical field
The invention belongs to soil remediation field, and in particular to a kind of compost that petroleum hydrocarbon contaminated soil is repaired using biogas slurry Method.
Background technology
In recent years, the development with national economy and demand, petroleum-type product supply are continuously increased.And opened in oil Adopt, in accumulating and refining process, there is substantial oil to enter soil, cause soil pollution, so as to further influence crops or plant Thing grows.According to statistics, China's oil contaminated soil area is up to 100,000 mu, and still in sustainable growth.Therefore, oil pollution has been As the outstanding problem of soil environment protection, serious threat is caused to ecological environment and health.
At present, Physical, chemical method and biological restoration are mainly included for the restorative procedure of oil-polluted soils.Its In, compost has that simple to operate, cost is low, effect is good and small etc. excellent to secondary environmental pollution as one of biological renovation method Point, it is considered to be most promising bioremediation technology.Oil-polluted soils composting process is mainly by contaminated soil and suitable material Material mixing, utilizes composting process microbial degradation petroleum hydrocarbon.
To meet energy demand yet with composting process and optimize biodegradable efficiency, therefore appropriate battalion should be increased Form point and content of microorganisms.Anaerobic fermentation has significant progress as the major technique that biogas is formed, and biogas slurry is as by-product Thing is dropped more, is formed secondary pollution, is underutilized.But containing abundant nutriment in biogas slurry, we are by natural pond Liquid is combined with contaminated soil, on the one hand, biogas slurry can improve the nutritional ingredient of composting process as new nutriment.The opposing party Face, addition biogas slurry can introduce inoculating microbe group, enhancement microbiological degradation function, so as to promote petroleum hydrocarbon to degrade.The present invention Both at utmost realized that biogas slurry recycled, and be suitable for petroleum hydrocarbon contaminated soil remediation, can reach ideal effect.
The content of the invention
To solve the problems such as cost is high, efficiency is low, workload is big in Petroleum concentration soil remediation, anaerobism is more made full use of Nutrition and micropopulation in zymotic fluid, the invention provides a kind of compost side that petroleum hydrocarbon contaminated soil is repaired using biogas slurry Method.
The compost method provided by the invention that petroleum hydrocarbon contaminated soil is repaired using biogas slurry, is comprised the following steps:
(1) biogas slurry is added in petroleum hydrocarbon contaminated soil, and is sufficiently stirred;
(2) compost under field conditions (factors), keeps the skin wet, regular turning.
Preferably, before biogas slurry is added, petroleum hydrocarbon contaminated soil is pre-processed, the pretreatment includes will pollution After soil air-dries, removal of impurities, crush and sieve.
Preferably, air-dried condition is:Rate of venting is 50~100mL/min, its moisture control scope is 10~ 15%;Clean to remove bulky grain thing;Broken is that soil is broken into fine granularity as former state with disintegrating machine;Sub-sieve during sieving Aperture is 2mm.
Preferably, before biogas slurry is added, by petroleum hydrocarbon contaminated soil petrochina hydrocarbon content scope control in 5000mg/kg Below.
Preferably, the oil hydrocarbon content is using infrared survey oil measure, if soil petrochina hydrocarbon content is higher than 5000mg/ Kg, then using same sampling place low concentration petroleum hydrocarbon contaminated soil mixed diluting or using the dilution of compost auxiliary material.
Preferably, the biogas slurry be will obtained thick biogas slurry after biogas slurry filtering after anaerobic fermentation, adjust its pH value and nitrogenous Amount, pH value is preferably 7.0~7.5, and nitrogen content is preferably 0.04~0.08%, it is preferable that nitrogen content in biogas slurry by adding Water or urea are adjusted.
Preferably, after adding biogas slurry in petroleum hydrocarbon contaminated soil, moisture content and carbon/nitrogen ratio (C/N) are adjusted.
Preferably, the moisture content of soil is adjusted using biogas slurry to 45~55%, carbon/nitrogen ratio is 15~20:1;Preferably, carbon Content is adjusted using the one or more in rice husk, stalk, sawdust, garden garbage, reconciles the material of carbon content through crushing Sieving, particle diameter are less than 2mm.
Preferably, the regulation heap body moisture content that kept the skin wet in secondary fermentation is the 50% of maximum water-holding capacity;Turning is benefit Heap body oxygen is filled, turning is once weekly.
Preferably, methods described also includes results of regular determination composting production petroleum content and bio-toxicity.
Compared with prior art, method of the invention has the advantages that::
The compost method of petroleum hydrocarbon contaminated soil is repaired using biogas slurry, processing method is simple, easy to operate, and cost is relatively low, Composting process substantially reduces petroleum content, and clearance is up to 70~80%, and the bio-toxicity of composting production is greatly lowered. Meanwhile the present invention replaces water the treatment of wastes with processes of wastes against one another, to reduce rehabilitation cost as compost additive, reduce money using anaerobic fermentation biogas slurry Source wastes.
Brief description of the drawings
Fig. 1 is the flow chart for the compost method that petroleum hydrocarbon contaminated soil is repaired using biogas slurry.
Embodiment
For the object, technical solutions and advantages of the present invention are more clearly understood, below in conjunction with specific embodiment, and reference Accompanying drawing, the present invention is described in further detail.
As shown in figure 1, the compost method provided by the invention that petroleum hydrocarbon contaminated soil is repaired using biogas slurry, including it is following Step:
(1) biogas slurry is added in petroleum hydrocarbon contaminated soil, and is sufficiently stirred;
(2) compost under field conditions (factors), keeps the skin wet, regular turning.
Before biogas slurry is added, petroleum hydrocarbon contaminated soil is pre-processed, the pretreatment is included contaminated soil wind After dry, removal of impurities, crush and sieve.
Air-dried condition is:Rate of venting is 50~100mL/min, and its moisture control scope is 10~15%;Removal of impurities To remove bulky grain thing, such as stone, plant etc.;Broken is that soil is broken into fine granularity as former state with disintegrating machine;During sieving Sub-sieve aperture be 2mm.
Before biogas slurry is added, by petroleum hydrocarbon contaminated soil petrochina hydrocarbon content scope control in below 5000mg/kg.
The oil hydrocarbon content, if soil petrochina hydrocarbon content is higher than 5000mg/kg, is used using infrared survey oil measure Same sampling place low concentration petroleum hydrocarbon contaminated soil mixed diluting is diluted using compost auxiliary material.
The biogas slurry is the thick biogas slurry that will be obtained after biogas slurry filtering after anaerobic fermentation, adjusts its pH value and nitrogen content, pH value Preferably 7.0~7.5, nitrogen content is preferably 0.04~0.08%, it is preferable that nitrogen content in biogas slurry by adding water or urea To adjust.
After adding biogas slurry in petroleum hydrocarbon contaminated soil, moisture content and carbon/nitrogen ratio (C/N) are adjusted.
Using the moisture content of this biogas slurry regulation soil to 45~55%, carbon/nitrogen ratio is 15~20: 1;Carbon content uses rice One or more in shell, stalk, sawdust, garden garbage are adjusted, and reconcile the material of carbon content through pulverizing and sieving, particle diameter is Less than 2mm.
The regulation heap body moisture content that kept the skin wet in secondary fermentation is the 50% of maximum water-holding capacity;Turning is supplement heap body oxygen Gas, turning is once weekly.
Methods described also includes results of regular determination composting production petroleum hydrocarbon content and bio-toxicity.
Below by one embodiment the present invention will be described in detail explanation.
Embodiment 1
Beijing petroleum hydrocarbon contaminated soil is taken, soil petrochina hydrocarbon content is 1729mg/kg, and it is big to remove stone, plant etc. Particulate matter, crushing and screening, cross 2mm sieves;Being air-dried, rate of venting is 50~100mL/min, its moisture content is adjusted to 10~ 15%.
Biogas slurry after anaerobic fermentation is taken, the wherein impurity such as bulky grain is removed, filtered fluid pH is adjusted to 7.
4.5L biogas slurries are added in 18.65kg petroleum hydrocarbon contaminated soil, rice husk 4.42kg are added, after stirring Vacant lot compost is placed, one group is separately set and biogas slurry is replaced as control using water.Wherein moisture content is adjusted to 45%, C/N and is adjusted to 18: 1.Until Compost terminates to be considered as reparation stopping.
Compost continues 29 days altogether, and composting production petroleum hydrocarbon content, experimental group and control group are determined using Infrared Oil Determination Instrument The final petroleum content of heap body is respectively 194mg/kg and 624mg/kg.Bio-toxicity inspection is carried out to the soil after reparation simultaneously Survey, specific testing result is as shown in table 1.
The composting process rehabilitating soil petroleum hydrocarbon of table 1 and germination index (GI) testing result
The testing result of consolidated statement 1, with being contrasted before soil remediation, to each finger of soil in petroleum hydrocarbon contaminated soil composting process Indicate high degree raising, repair the 9th day, experimental group and control group petrochina hydrocarbon content reduce respectively 78.9% and 25.0%, absolutely prove that addition biogas slurry accelerates the degraded of composting process petrochina hydrocarbons pollutant.Repair to 29 days, experimental group with Control group petrochina hydrocarbon content reduces 86.6% and 54.5% respectively, illustrates compared with Traditional compost method, to repair using biogas slurry The compost method of multiple petroleum hydrocarbon contaminated soil has pole positive effect.Experimental group germination index reaches 87% simultaneously, reaches rotten Ripe compost requirement, illustrate that its toxicity can be greatly lowered by adding biogas slurry reparation, and reach innoxious standard.
Particular embodiments described above, the purpose of the present invention, technical scheme and beneficial effect are carried out further in detail Describe in detail bright, it should be understood that the foregoing is only the present invention specific embodiment, be not intended to limit the invention, it is all Within the spirit and principles in the present invention, any modification, equivalent substitution and improvements done etc., the protection of the present invention should be included in Within the scope of.

Claims (10)

1. a kind of compost method that petroleum hydrocarbon contaminated soil is repaired using biogas slurry, is comprised the following steps:
(1) biogas slurry is added in petroleum hydrocarbon contaminated soil, and is sufficiently stirred;
(2) compost under field conditions (factors), keeps the skin wet, regular turning.
2. compost method as claimed in claim 1, it is characterised in that:Before biogas slurry is added, petroleum hydrocarbon contaminated soil is entered Row pre-processes, and the pretreatment is included after contaminated soil is air-dried, and removal of impurities, crushes and sieves.
3. compost method as claimed in claim 2, it is characterised in that:Air-dried condition is:Rate of venting is 50~100mL/ Min, its moisture control scope are 10~15%;Clean to remove bulky grain thing;Broken is with disintegrating machine that soil is broken as former state It is broken into fine granularity;Sub-sieve aperture during sieving is 2mm.
4. compost method as claimed in claim 1, it is characterised in that:Before biogas slurry is added, by petroleum hydrocarbon contaminated soil Petroleum hydrocarbon content range is controlled in below 5000mg/kg.
5. compost method as claimed in claim 4, it is characterised in that:The oil hydrocarbon content is determined using infrared survey oil, if Soil petrochina hydrocarbon content is higher than 5000mg/kg, then dilute using same sampling place low concentration petroleum hydrocarbon contaminated soil mixing Release or diluted using compost auxiliary material.
6. compost method as claimed in claim 1, it is characterised in that:The biogas slurry is will to be obtained after anaerobic fermentation after biogas slurry filtering The thick biogas slurry arrived, its pH value and nitrogen content are adjusted, pH value is preferably 7.0~7.5, and nitrogen content is preferably 0.04~0.08%, excellent Selection of land, nitrogen content are adjusted by adding water or urea in biogas slurry.
7. compost method as claimed in claim 1, it is characterised in that:After adding biogas slurry in petroleum hydrocarbon contaminated soil, adjust Save moisture content and carbon/nitrogen ratio (C/N).
8. compost method as claimed in claim 7, it is characterised in that:Using the moisture content of biogas slurry regulation soil to 45~ 55%, carbon/nitrogen ratio is 15~20: 1;Preferably, carbon content is using rice husk, stalk, sawdust, one kind in garden garbage or several Plant to adjust, reconcile the material of carbon content through pulverizing and sieving, particle diameter is less than 2mm.
9. compost method as claimed in claim 1, it is characterised in that:Keep the skin wet regulation heap body moisture content in secondary fermentation For the 50% of maximum water-holding capacity;Turning is supplement heap body oxygen, and turning is once weekly.
10. compost method as claimed in claim 1, it is characterised in that:Methods described also includes results of regular determination composting production stone Oily hydrocarbon content and bio-toxicity.
CN201711051065.9A 2017-10-31 2017-10-31 Composting method for restoring petroleum hydrocarbon polluted soil by utilizing biogas slurry Active CN107803400B (en)

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WO2017140324A1 (en) * 2016-02-16 2017-08-24 Biotatec Oü Method for decomposition of the metallorganic matter of graptolite-argillite by microbial consortium

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CN1994039A (en) * 2006-12-21 2007-07-11 浙江大学 Safety and nuisance-free bio-gas liquid application method
WO2017140324A1 (en) * 2016-02-16 2017-08-24 Biotatec Oü Method for decomposition of the metallorganic matter of graptolite-argillite by microbial consortium
CN205436606U (en) * 2016-03-24 2016-08-10 中国科学院新疆生态与地理研究所 Reaction bed of microbiological treatment oiliness waste residue
CN106623399A (en) * 2016-10-27 2017-05-10 北京市环境保护科学研究院 Method for restoring hexavalent chromium polluted soil through biogas slurry
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