Method for repairing soil containing novel organic pollutant by using sludge biological carbon

A technology for organic pollutants and polluted soil, which is applied in the field of using sludge biocarbon to remediate soil containing emerging organic pollutants. It can solve the problem of slow effect of plant and microbial remediation methods, unfavorable large-scale promotion and application, and large disturbance of the surrounding ecological environment. and other problems, to achieve long-lasting repair and improvement effects, stable and reliable repair efficiency, and the realization of solid waste recycling

Inactive Publication Date: 2014-05-21
GUANGZHOU INST OF ADVANCED TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] (1) Physical restoration and chemical restoration are traditional restoration methods. Although the goal is direct and some results have been achieved in practical applications, there are problems such as complex implementation, high cost, large disturbance to the surrounding ecological environment, and serious ecological impact during construction. The remediation efficiency of low-concentration contaminated soil is

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0034] Example 1

[0035] After drying the remaining sludge of the urban sewage treatment plant at 60°C, it is crushed and sieved through 200 meshes. The powder is put into a vacuum tube furnace and passed through N at a flow rate of 0.5L / min 2 0.5h, 5℃ / min heated to 350℃, carbonized for 3h, cooled to room temperature, black biochar was obtained with a yield of 50%. Mix evenly with contaminated soil samples (BPA content 10mg / kg) according to 2% mass percentage. Under laboratory conditions, after 6 months of aging, the leaching concentration of BPA in the soil was not detected.

Example Embodiment

[0036] Example 2

[0037] The urban sludge is mixed with waste rice straw (mass ratio 1:2), dried at 60°C, crushed and sieved through 50 meshes, the powder is put into the vacuum tube furnace, and the flow rate is 0.75L / min. 2 0.35h, 5℃ / min heated to 300℃, carbonized for 5h, cooled to room temperature, obtained black biochar with a yield of 45%. Apply 3.5% of the mass percentage to the soil (red soil) seriously polluted by antibiotics (20.37mg / kg), and plow and mix the soil of 0-10cm on the surface. After 12 months of natural aging, it is found that antibiotics can be used. The leaching concentration is gradually reduced to no detection, and it can be cultivated on contaminated soil. Six months later, it was found that the yield of kidney bean crops increased by 5%, and the heavy metals Cr, Pb, Mn, etc. in the product did not exceed the standard.

Example Embodiment

[0038] Example 3

[0039] Using the harmless treatment of municipal sludge and rice straw (mass ratio 2:1), drying at 60°C, crushing and sieving 100 meshes, the powder is put into a vacuum tube furnace, and the flow rate is 0.5L / min. N 2 After heating to 400°C for 0.5h at 7°C / min, carbonizing for 2h, cooling to room temperature, to obtain black biochar with a yield of 70%. Apply 1% mass percentage to the tea field soil contaminated by antibiotics and heavy metals (tetracycline 0.91mg / kg, copper 150mg / kg), and plow and mix the 0-25cm soil on the surface for 6 months After natural aging, it was found that the leaching concentration of pollutants gradually decreased to below the safety level of environmental standards.

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Abstract

The invention discloses a method for repairing soil containing novel organic pollutants by using sludge biological carbon. The method comprises the steps of (1), drying a biomass raw material containing sludge at a temperature of 40-60 DEG C, sieving the biomass raw material containing the sludge via a sieve with 10-200 meshes, and carbonizing the biomass raw material for 0.5-6 hours at a temperature of 300-650 DEG C under an anaerobic condition to prepare biomass carbon; (2), applying the prepared biomass carbon to the surface of the polluted soil according to a mass ratio of 0.5-5%, plowing the surface layer of the polluted soil in a distance of 0-30cm, and enabling the surface layer of polluted soil to be fully and evenly mixed with the biomass carbon; and (3), aging for 6-12 months. The biomass carbon is low in cost of preparation raw material and environmentalally-friendly; the preparation process is simple and feasible and totally conforms to the principle of turning waste into wealth and forming the stereoscopic agriculture. In addition, the biomass carbon contains a large quantity of carbon elements and nutritional ingredients; the biomass carbon has the effect of fertilizing the soil.

Description

technical field [0001] The invention relates to a method for repairing emerging organic polluted soil, in particular to a method for using sludge biochar to restore soil containing emerging organic pollutants. Background technique [0002] Soil is a natural adsorbent and carrier because of its electronegativity and high specific surface area, and it is the most important sink for emerging organic pollutants. Emerging Organic Contaminants (EOCs) include Endocrine Disrupting Chemicals (EDCs), Pharmaceuticals and Personal Care Products (PPCPs) and Perfluorinated Compounds (PFCs). Emerging organic pollutants are chemically very different from traditional persistent organic pollutants. Persistent organic pollutants tend to have low water solubility, so their mobility in soil is poor; while emerging pollutants have high water solubility and are mostly hydrophilic substances, so their mobility and bioavailability in soil are poor. High, more harmful to soil, especially agricultur...

Claims

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Application Information

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IPC IPC(8): B09C1/00
Inventor 费颖恒赵丹陈顺权
Owner GUANGZHOU INST OF ADVANCED TECH CHINESE ACAD OF SCI
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