Trace gasolene ingredient BTEX in ground water removal method with high-efficiency and low consumption

A groundwater and trace technology, applied in the field of water treatment, can solve the problems of large area of ​​activated sludge pond, secondary pollution, increase of process operating costs, etc., to reduce construction sites and costs, reduce operating costs, and save processing costs. Effect

Inactive Publication Date: 2009-03-18
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although air stripping can effectively remove BTEX from the liquid phase, it produces waste gas containing BTEX, which requires further air treatment devices, and is prone to secondary pollution; while activated sludge tanks generally occupy a large area , also need process operations such as aeration and oxygenation, which increases the cost of process operation

Method used

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  • Trace gasolene ingredient BTEX in ground water removal method with high-efficiency and low consumption
  • Trace gasolene ingredient BTEX in ground water removal method with high-efficiency and low consumption
  • Trace gasolene ingredient BTEX in ground water removal method with high-efficiency and low consumption

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] See figure 1 , 2 and 3, take raw coal crushed carbon (20-40 mesh) as the activated carbon carrier, use the bacteria domesticated in the toluene bio-activated carbon column in the early stage, set EBCT to 10min and inoculate for 2h. After that, EBCT was set to 1.2min, and the influent concentration was 30-50mg / L, and the biological activated carbon process of four benzene series (benzene, toluene, ethylbenzene and o-xylene) was carried out. After 2 weeks of treatment, it was shown that only The effluent concentration of benzene rises (to 10mg / L, C / C 0 was 0.29), then decreased slightly and remained at 5-10mg / L (C / C 0 is about 0.20), and the rest of the benzene series effluent has been maintained at a level of less than 5mg / L. The volume load of four sets of benzene series BAC is as high as 38.4~50.4kg / m 3 / d, after testing, the difference of dissolved oxygen in and out of the carbon column is maintained at 2.0-3.5 mg / L, which is much lower than the theoretical oxygen...

Embodiment 2

[0025] Take raw coal crushed charcoal (20-40 mesh) as the activated carbon carrier, use the bacteria domesticated in the toluene bio-activated carbon column in the early stage, set EBCT to 10min and inoculate for 2h. Set EBCT to 3.2min, with 10mg / L as the influent concentration, carry out the biological activated carbon process of four benzene series (benzene, toluene, ethylbenzene and o-xylene), after 40 days of treatment, in addition to benzene, No benzene series were detected in the BAC effluent of other BTEX. After the initial adsorption phase, the effluent concentration of benzene, which is poorly adsorbed and biodegradable, increased gradually (to 4 mg / L) and then slowly decreased below the detection limit (<0.5 mg / L). It shows that BAC can effectively remove BTEX in water for a long time.

Embodiment 3

[0027] Raw coal crushed charcoal (20-40 mesh) and an equal volume of quartz sand were used as the carrier. The raw coal was preloaded with benzene, and the strains domesticated in the benzene bioactivated carbon column were used in the early stage. Set the EBCT to 1.1min, the influent concentration to 20-40mg / L, and carry out the biological activated carbon process of benzene. After three weeks of operation, it was shown that the benzene bioactivated carbon effluent C / C 0 It is kept at about 0.15-0.25, which is continuously lower than the effluent of quartz sand by 1-2 mg / L, indicating that activated carbon can provide a better growth environment for microorganisms and obtain a more ideal treatment effect.

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Abstract

The invention discloses a method for removing trace gasoline component BTEX in groundwater with high efficiency and low energy consumption. Sludge supernatant goes through activated carbon bed layer from bottom to top through a sampling pump, flows back a sludge supernatant storage tank after flowing out from the upper end of an activated carbon column and so the cyclic inoculation goes; inlet water is switched into BTEX polluted water to carry out acclimation reproduction on bacteria inoculated on the activated carbon so as to form a biofilm; the inlet water enters the activated carbon column through the sampling pump by an updraft mode, and after operation the biofilm becomes mature through natural acclimation at the BTEX activated carbon column; after the biological activated carbon bed layer is slightly dredged, part microorganism in the bed layer goes up to the upper part of the bed layer with the rise of the water flow, trace microorganism concentrated bacteria liquid is removed by a pipette and is taken as a bacteria source after being diluted; and the bacteria source is used for inoculation of new carbon columns by the previous cyclic inoculation method, thus obtaining new BTEX biological activated carbon technique. The method has the advantages of high capacity load, small requirement amount on dissolved oxygen, simple and convenient flow, simple technique equipment and easy operation and management.

Description

【Technical field】 [0001] The invention relates to the technical field of water treatment, in particular to a method for removing trace gasoline component BTEX in groundwater with high efficiency and low consumption. 【Background technique】 [0002] The basic components of petroleum are hydrocarbons such as hydrocarbons and aromatic hydrocarbons. Among them, the substances recognized as toxic and carcinogenic are mainly BTEX (benzene, benzene; toluene, toluene; ethylbenzene, ethylbenzene; xylene, xylene). With the widespread use of gasoline and other petroleum products and the leakage of oil tanks, other means of transportation, and underground oil storage tanks during downhole operations and oil and gas gathering and transportation during oil extraction, BTEX has become the most common groundwater pollutant. For this reason, the U.S. Environmental Protection Agency listed BTEX as a priority pollutant. In domestic areas where groundwater is seriously polluted by petroleum hy...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/58C02F3/12
CPCY02W10/10
Inventor 张巍李冰璟李影黄流雅胡娟应维琪
Owner EAST CHINA UNIV OF SCI & TECH
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