Abstract
The furrow irrigation tests were done to estimated the efficiency of the HRT(Hydraulic Retention Time) and landfill leachat collected from Dalian Maoyimgzi Municipal Solid Waste Landfill, which contained high level of COD (Chemical Oxygen Demand, 3.8 × 104 mg·L–1), TOC (total carbon, 4.8 × 103 mg·L–1), TN(total nitrogen, 2.9 × 103 mg·L–1) and SS (Suspended Solids, 6.5 × 102 mg·L–1), using the reed (phragmites) cultivated onland located in south area of Dalian Jiaotong University. The results showed that: 1) The TN concentration was decreased from 9.8 × 102 mg·L–1 in the landfill leachate to 7.6 × 102 mg·L–1 in the soil water, and the 22.4% of the removal rate; 2) The TOC concentration was decreased from 4.8 × 103 mg·L–1 in the landfill leachate to 1.0 × 103 mg·L–1 in the soil water, and the 79.2% of re- moved rate; 3) The water concentration in the soil was no significant difference of irrigation between the water and the landfill leachate; 4) ΔHRT was 2.1 hours in irrigation 39 L of the water and landfill leachate and 1.3 hours in the 9 L.
Highlights
There are many project cases and researches on treating the landfill leachate with constructed wetland around the world
The furrow irrigation tests were done to estimated the efficiency of the HRT (Hydraulic Retention Time) and landfill leachat collected from Dalian Maoyimgzi Municipal Solid Waste Landfill, which contained high level of COD (Chemical Oxygen Demand, 3.8 × 104 mg·L–1), Total Carbon (TOC), Total Nitrogen (TN) and SS (Suspended Solids, 6.5 × 102 mg·L–1), using the reed cultivated onland located in south area of Dalian Jiaotong University
The results showed that: 1) The TN concentration was decreased from 9.8 × 102 mg·L–1 in the landfill leachate to 7.6 × mg·L–1 in the soil water, and the 22.4% of the removal rate; 2) The TOC concentration was decreased from 4.8 × mg·L–1 in the landfill leachate to 1.0 × 103 mg·L–1 in the soil water, and the 79.2% of removed rate; 3) The water concentration in the soil was no significant difference of irrigation between the water and the landfill leachate; 4) ΔHRT was 2.1 hours in irrigation 39 L of the water and landfill leachate and 1.3 hours in the 9 L
Summary
There are many project cases and researches on treating the landfill leachate with constructed wetland around the world. Ithaca Landfill in New York in the USA started to treat the landfill leachate with constructed wetland in 1989 [1]. Chunchula Landfill in the city named Mobile in Alabama in the USA mixed the wastewater and landfill leachate together and treated with constructed wetland, and expelled at the standard [2]. The city named Monroe in New York in the USA treated the landfill leachate from Northeast-quadrant Solid Waste Facility after sealing of landfill with constructed wetland, and the average removal rate of COD was 68%. Dragonja Landfill in Slovenia treated the landfill leachate with constructed wetland, and the average removal rate of COD was 68% [7]. There is little reach on treating the landfill leachate with the method of land fill leachate preferential flow and reflowing tests on undisturbed soil cuboids in cultivated onland
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