To build environmentally friendly highways, we testes suitability for unique characteristics of pollution mitigation facility around the highways by evaluating optimal selections and implementation methodologies to minimize loan of non-point pollution substances into water-ways. To do this we categorized EIA target highways into three types ; big drainage basin, small drainage basin, and bridge section as to minimize non-point pollution of highway runoff. The terms of selected facility test based on the Natural and Manufactured Treatment Device were removal efficiency of TSS, BOD, COD, T-N, T-P, compatibility of site selection, economic feasibility, maintenance convenience, and the final mitigation facility.Key words: Non-point source pollution mitigation facility, Highway, Catchment basin area 접수 : 2011. 11. 20 수리 : 2011. 12

This investigation was conducted to provide the control methods of N and P by observing the distribution of nitrogen and phosphorus in arable and forest stands along the boundary of upstream Daechung Reservoir in which water quality properties caused by N and P from land uses was not extensively studied. To do this, we selected three different soil zone such as arable (paddy and upland), orchard, and forest stands including pine and larch of which inputs of N and P have been known to be different due to their foliage properties. Soil samples were collected from surface and subsurface to measure soil physical and chemical properties. The results showed that the soil textures of investigation sites are loamy sand and sandy loam and the stone ratio of both forest stand are approximately 38.7%. The organic matter content in both forest stands was above 5.6% while that of the paddy and upland are less than 3%. Soil pHs are strongly acidic except for orchard of which it is above 5.7 but less than 6.64. However, pHs of all the sites slightly increased from May to October. The amount of NO3and NH4 + as water soluble phase is less than that of exchangeable phase in paddy while that of NO3and NH4 + as exchangeable phase is greater than that of water soluble phase in upland and the forest stands of pine and larch. For the proportions of phosphorus remained as water soluble-and exchangeable phase depending on the total P, the proportion of water soluble in paddy and pine stand was greater than 10% while those of exchangeable P are less than 10% in upland, orchard, and larch stands. From these results based on the amount and the proportion of N and P in soil, we could assume that N and P from the both pine and larch stands may contribute the deterioration of water quality of Daechung Reservoir.

No abstract

Biopiles which offer the potential for cost-effective treatment of contaminated soils are above-ground, engineered systems that use oxygen to stimulate the growth and reproduction of aerobic bacteria for degradation of the petroleum constituents adsorbed to soil in excavated soils. This technology involves heaping contaminated soils into piles and stimulating aerobic microbial activity within the soils through the aeration and/or addition of minerals, nutrients, and moisture. Inside the biopile, microbially mediated reactions by blowing or extracting air through the pipes can enhance degradation of the organic contaminants. The influence of a aeration system on the biopile performance was investigated. Air pressure made to compare the efficiency of suction in the pipes showed that there were slightly significant difference between the two piles in the total amount of TPH biodegradation. The normalised degradation rate was, however, considerably higher in the aeration system than in the normal system without aeration, suggesting that the vertical venting method may have improved the efficiency of the biological reactions in the pile.

The estimation of water retention for perlite particles, which are used as growth media need to set up for proper water management strategy due to uncertain available water proportion during growth period of vegetable crops in a greenhouse. The water retention curves (WRC) expressed as volumetric water content (θ v ) were constructed with five different sizes of the expanded perlite after fully saturating and packing the perlite in open-ended metal cubes at 11 levels of matric potentials from 0 to -1,500 kPa. The best fitted four parameter values (θ s , θ r , n, α) of the van Genuchten model (vG model) for the substrate samples were obtained using the Retention Curve Program (RETC) based on the values measured water content at the corresponding matric potentials. The particle size corresponding to 36.8 percentage by mass of particles was 0.80065 mm. The calculated uniformity coefficient and the coefficient of gradation for the perlite were 1.962 and 2.51 mm, respectively. Measured water contents at each matric potential increased with decreasing particle size of perlite while the difference of water content between saturation (θ s ) and residual state (θ r ) increased with increasing particle size. The mean R 2 for all sizes of the perlite particle was suitable to predict θ v because the measured data points did not vary around the estimated regression line. Therefore, PTF performance based on van Genuchten (vG) equation using data set including perlite particle size can be applicable to estimate water retention in perlite particles.