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This paper focuses on the problems of landfill gas leakage and the difficulty in controlling malodorous gases during the landfilled waste excavation. A field trial was conducted on a 30m×30m site in a Hainan landfill, equipped with 13injection, 12 extraction, and 16 monitoring wells. An intensive aeration pretreatment experiment was conducted with a gas injection flow rate of 340m3/h and a gas extraction flow rate of 360m3/h to explore the control effects of aerobic intensive aeration on methane and malodorous gases. The results indicate that within 2h of the first intensive aeration, the ambient landfill gas was rapidly displaced, with the oxygen content in the test area exceeding to above 17%, the average methane content decreasing to 1.9%, and the average hydrogen sulfide content decreasing from 21.3mg/m3 to 5.7mg/m3. In contrast, ammonia levels rose sharply to 286.7mg/m3, which is attributed to the stripping of pore leachate by aeration-induced disturbance. Prolonging the aeration duration was found to be crucial for suppressing the rebound of methane and hydrogen sulfide after aeration ceased. After the first 9-day aeration test, methane concentrations at depths of 4.5m and 8.5m were reduced to 0.33% and 0.61%, with hydrogen sulfide inhibition rates of 81.0% and 83.9%, respectively. However, within 8hours of stopping aeration, methane levels rebounded to above 4% and 6%, and inhibition rates for hydrogen sulfide dropped to 65.6% and 74.1%. In contrast, after the second 30-day aeration test, methane concentrations remained below 3%, and hydrogen sulfide inhibition rates were maintained at 81% and 91%, even 48 hours post-aeration. It was estimated that the two trials cumulatively removed approximately 5779.6 mol of ammonia, accounting for 45% of the total ammonia nitrogen in the pore leachate of the test area. The study demonstrates that appropriate short-term, high-intensity aeration pretreatment can effectively inhibit odorous gas emissions during the subsequent excavation of landfill mass.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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