Bioretention pond capable of removing petroleum pollutants by using efficient biological film

A bioretention pond and biofilm technology, applied in the field of environmental bioengineering, can solve the problems of small number of microorganisms, limited removal effect, low conversion efficiency, etc., and achieve the effect of obvious effect, good effect, and easy maintenance and repair.

Inactive Publication Date: 2016-06-22
SHANDONG JIANZHU UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since bioretention ponds mainly rely on bioabsorption and biotransformation to remove organic matter, the removal effect on some refractory organic pollutants is limited (such as petroleum hydrocarbons, benzene pollutants)
[0004] With the continuous increase of the number of automobiles in our country, the consumption of petroleum products is also increasing year by year. Oil leakage incidents in gas stations, automobile repair shops, oil depots and highways occur from time to time, and there are relatively large amounts of oil in the rainwater and flushing water. High concentration of petroleum pollutants, unable to effectively remove these pollutants, has a great environmental risk
The biodegradation of petroleum pollutants depends on the transformation of microorganisms. In nature, the number of microorganisms that can degrade petroleum hydrocarbons is small, and the conversion efficiency is low. At the same time, there are still problems of long-term survival
[0005] Conventional bioretention ponds can effectively remove pollutants such as total suspended solids, heavy metals, N, and P in surface runoff, but are not effective in removing refractory and difficult-to-remove petroleum hydrocarbon pollutants; in addition, conventional bioretention ponds Vegetation and soil cover are often used to absorb and remove petroleum hydrocarbon pollutants. Although the efficiency is sometimes high, it depends more on vegetation and specific environmental soils, and its application range is limited.

Method used

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  • Bioretention pond capable of removing petroleum pollutants by using efficient biological film
  • Bioretention pond capable of removing petroleum pollutants by using efficient biological film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The selection of embodiment 1 biofilm carrier filler

[0028] Biofilm carrier fillers to be screened include zeolite, granular activated carbon, slag, diatomaceous earth, volcanic rock, PVC particles, PE particles, PS particles, PP particles and soft fibers, etc. According to the combination in Table 1, seven experiments with a volume of 1L were designed The chamber simulation device was operated for 30 days under the condition of 20°C and low water inflow of 40ml / hour, and the influence of different filler combinations on the formation of biofilm was observed. The test results (see Table 1) show that the formation of biofilm is the best when the upper filler is selected from zeolite and granular activated carbon, and the lower filler is selected from soft fiber carrier.

[0029] Table 1 Effect of biofilm carrier filler types on biofilm formation

[0030]

Embodiment 2

[0031] Example 2 Enrichment of High Efficiency Petroleum Hydrocarbon Degrading Bacteria

[0032] Prepare liquid medium according to the following steps: Take 100g soil sample, add 1000ml surface water, mix and shake for 10min, settle to get supernatant, make up 1000ml with surface water, add 0.2% peptone and 0.1% petroleum, 0.15MPa sterilize for 30min.

[0033] Collect 10 g of samples from the long-term oil-polluted soil around the oil field, dilute with 100 ml of the above-mentioned liquid medium, shake and mix, and after precipitation, take the supernatant and inoculate it into the liquid medium. 20°C, 30rpm acclimatization and enrichment culture for 5 days, then inoculated into new liquid medium, and continued acclimatization and enrichment culture. Continuous acclimatization and enrichment were carried out 5 times, and the obtained mixed flora was used as the strain for cultivating biofilm.

Embodiment 3

[0034] Embodiment 3 builds the bioretention pond with biofilm

[0035]A bioretention tank with biofilm carrier filler, the construction site is near the gas station, and the construction plan is: from top to bottom, there are planting soil layer (thickness 400mm), filter layer (thickness 300mm) and gravel layer (thickness 600mm) The planting soil layer is planted with herbs (Ophiopogon japonicus and clover) and shrubs (Buxus euonymus); the filter layer is composed of quartz sand, zeolite and granular activated carbon in a volume ratio of 7:2:1; the gravel layer is composed of gravel with a diameter of 20mm and soft The fiber carrier is composed of a volume ratio of 9:1; two PVC pipes with a diameter of 110mm are laid vertically, one PVC pipe reaches the middle of the filter layer, and the other PVC pipe reaches the middle of the gravel layer; the bottom is laid with a 70mm diameter PVC drain pipe and valve.

[0036] (1) No biofilm operation

[0037] After the bioretention tan...

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Abstract

The invention provides a bioretention pond capable of removing petroleum pollutants by using an efficient biological film, belonging to the field of environmental bioengineering. Aiming at the problem that the bioretention pond is poor in petroleum removal effect, the invention takes the conventional bioretention pond technology as a basis; efficient degradation microorganisms are inoculated and cultured by arranging a carrier material of the biological film at a specific bioretention area to generate a biological film system, so that effects of maintaining the long-term surviving of the microorganisms and enhancing the removal of the petroleum pollutants are achieved. The bioretention pond can be applied to storage and purification of rainwater or wash water of places such as a highway, a gas station, an automobile service factory, an oil depot and the like which have higher oil spill risk, and can reduce the damage of the petroleum pollutants to the water environment.

Description

technical field [0001] The invention relates to a bioretention pond for removing petroleum pollutants by using a high-efficiency biofilm, and belongs to the field of environmental bioengineering. Background technique [0002] Urban rainwater runoff management is of great significance to solving urban water shortages, flood disasters, non-point source pollution and other issues. How to effectively control non-point source pollution caused by urban rainwater runoff has become one of the important problems faced by urban management. . In recent years, the rainwater runoff pollution in most cities in my country has been serious, which has become the primary factor for the deterioration of urban river and lake water quality. The traditional urban drainage system design is based on the removal of rainwater as soon as possible. This design method has many disadvantages. It is one of the challenges facing urban management to explore how to manage urban stormwater runoff to meet th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/34
CPCC02F3/341C02F3/344C02F2101/32C02F2103/001C02F2305/06
Inventor 钟传青张荻姜爱华张言曹广祥
Owner SHANDONG JIANZHU UNIV
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