chung- shiau ho *, wen-yen huang, wen-ling hong, chitsan lin, po-han chen

2012 International Conference on Environmental Quality Concern, Control and Conservation (EQC

2012)

The Treatment of Diesel Contaminated Soil By Food Waste Composting, and the Feasibility of

Continued Re-Farming on Its Treated Soil

Chung-Shiau Ho*,Wen-Yen Huang, Wen-Ling Hong, Chitsan Lin, Po-Han ChenGraduate Student of the Department of Marine Environmental

Engineering, National Kaohsiung Marine University, Kaohsiung 81157, Taiwan.

May 25-26, 2012

1

Introduction

Experimental Design

Experimental Method

Results and Discussion

Conclusions

Outline

2

Petroleum Fuel as the key support of modern industry plays a core role in the development of global economy.

But the complex of the petroleum refine processes, and it’s huge demand often result in oil spills.

According to the Soil and Groundwater Pollution Remediation Web Pages of Taiwan EPA, there are 51 documented oil-related remediation sites in Taiwan.

Introduction (1/2)

3

Therefore, there is a strong need to develop an environmental sound technology to treat mineral oil contaminations.

In this study, we were exploring to apply the food waste composting technology on the remediation of diesel contaminated soil, hoping to develop a cost effective and feasible green technology.

Finally, the feasibility of continued re-farming on the treated soil was evaluated.

Introduction (2/2)

4

About Food Waste Composting Processes to Treat Diesel

Contaminated Soil

5

100 Tons Field Scale Test(50 tons diesel contaminated soil : 50 tons food waste)

66

7

Turnover of the compost pile, indicating thermophilic fermentation

7

Results of TPH DegradationIt took only 7 days to meet the treatment target

, and indicated a very effective treatment method

8

0

200

400

600

800

1000

1200

1400

1600

1800

0 7 14 21 28 35 42 49 56 63

TPH

(mg/

kg d

ry w

t)

天數(Days)

National Control Limit 1,000 mg/kg

Days8

Treated Soils Fertility Study-- Corn Planting Experiment

9

Treated soils Site preparation Corn planting

Harvest Corn growth Corn germination10

F W Composting Treated SoilH2O2 Treated Soil

Treated by adding hydrogen

peroxide (H2O2).

Initial diesel concentration

was 3,000 mg/kg.

It took more than 30 days to

complete the treatment.

Two kind of treated soils were parallely compared

Treated food waste composting

technology.

Initial diesel concentration was

3,000 mg/kg.

It took only 7 days to complete

the treatment.

11

Here are the parallel comparison results

Corn planting on day 0

H2O2 treated soils FW composting treated soil

12

On the 9th days

Germination sparse Germination thriving

H2O2 treated soils FW composting treated soil

13

On the 15 days

Average height of 15 cm Average height of 20 cm

H2O2 treated soils FW composting treated soil

14

On the 32 days

Average height of 53 cm Average height of 110 cm

H2O2 treated soils FW composting treated soil

15

On the 63 Days

H2O2 treated soils FW composting treated soil

16

0 1 2 3 4 5 6 7 8 90

30

60

90

120

150

180

210

240

1 1317

2744

6280

115 120 128

5 1636

77100

130

162185 190 191

Chemical remediationComposting remediation

Days（ week）

Ave

rage

H

eigh

t（cm）

Time Series Growth DataFW Compost treated soil grows much better than H2O2 treated soil

17

Why FW composting treated soil grows better ?

Root system badly developed Root system well developed

H2O2 treated soils FW composting treated soil

18

A better view for comparison

19

Soil Fertility Comparison

Item H2O2 treated soil FW composting treated soil

Ideal soil fertility References

pH 8.7 7.4 5.5~7.5 Taichung District Agricultural Research and Extension StationEC 0.2 0.8 0.5~1.2

mS/m

Ash (%) 90 79 - -

C/N 19  17 20以下Compost Standard

Germination % 70 95 80%以上

20

Harvest per unit area

21

22

23

The following product inspections demonstrate the corns are safe to eat.

Corn - Toxic heavy metal Corn - Pesticide residues Corn - Other semi-VOC Soil - TPH analysisSoil - PAH analysis

All the analyses were performed by the SGS International Accreditation Laboratory

24

25

Meet the  fruits and vegetables regulations, cadmium limits: 0.05 ppm; lead: 0.1 ppm

五

Conclusions

26

In this study, we were able to treat the 3,000 mg/kg

diesel contaminated soil to 801 mg/kg that comply with

the regulatory limit of 1,000 mg/kg in soil. And it took

only 7 days.

The treated soil was examined with TPH and PAHs. Results

indicate the treated soil is safe to backfill and to reuse.

27

Therefore, we suggest that the Food Waste Composting

process as a green remediation alternative to treat the

diesel contaminated soil.

Owing to the better fertility of the treated soil, our parallel corn

growing test had demonstrated that the FW composting treated

soil had out-grow the traditional chemical oxidation treated soil.

And the harvest corn products were safe to eat, as it meets the

Safe Organic Fruits and Vegetables Standard.

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29

Thanks for your attention

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