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Document Type |
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Thesis |
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Document Title |
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MUNICIPAL WASTE SITE SELECTION FOR RABIGH CITY (SAUDI ARABIA) اختيار موقع للنفايات البلدية في مدينة رابغ (المملكة العربية السعودية) |
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Subject |
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Faculty of Earth Sciences |
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Document Language |
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Arabic |
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Abstract |
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Municipal Solid Waste (MSW) is defined as any used and unwanted heterogeneous and mixed materials originating mostly from organic matter, paper, and glass. Rabigh city, on the west side of Saudi Arabia, uses the old-fashioned open dump area. It seems to the public that waste does not cause any harm, but when they keep piling up in the dump area, they mix and start to react through biological and chemical processes forming a hazardous product. The essence is to make the waste harmless by storing the material in an effectively isolated special location called a sanitary landfill for long periods.
The landfill site selection was performed in three steps:
• Identify the suitable areas opposite to wind direction (Leeward Direction) and away from the main flood area.
• Select the potential sites within suitable areas that are isolated from the public.
• Compare the potential sites with each other to select the best one using additional factors such as their sizes or the distance to the city, and agricultural and industrial activities.
Based on the three steps, it was found that the area north and northeast of Rabigh city must be excluded due to the wind and flood effect. Three potential sites were identified at the foot of the mountains southeast of Rabigh. Naturally, the identified sites differ in size elevation, and some rock or soil engineering properties.
The best site among them is only 20 km from the city, its area is 2 km2 which is enough size for an operation of more than 30 years. The soil types varied from poorly to well-graded sand, their permeability is considered high enough for liquid waste to percolate and migrate through the ground to the neighboring areas. The selected site is surrounded by a plateau forming a horseshoe shape. The plateau is composed of a basaltic layer 2 to 3 m thick followed underneath by an inclined surface of sandstone 7m thick.
The basalt is strong as measured by the point load but dissected by several joint sets forming cubical blocks of different sizes. On the contrary, sandstone is weathered in most locations to the extent it can be scraped easily by the geologic hammer. That is why natural sandstone slope failure is common leading to the toppling of the basaltic blocks.
Slope stability analysis was performed for both dry and wet conditions implementing (Slide 6) software. It was found that the factor of safety (Fs) is around or less than 1 in several locations which are not stable.
Several small wadies are flowing on the upper surface of the plateau toward the best site. Their peak discharge as calculated by the Rational method ranges from 0.19 to 11.74 m3/s. To protect the landfill from local flood channels of adequate size and slopes were recommended to accommodate and divert water flood.
The final step of the site preparation is to divide the site into many cells and isolate each by a special type and strong landfill barrier to prevent or at least minimize potentially irreversible contamination. High-Density Polyethylene (HDPE) is common.
Keywords: Landfill, Design, Flood, Environment, Investigation. |
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Supervisor |
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Prof. Abdullah A. Sabtan |
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Thesis Type |
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Master Thesis |
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Publishing Year |
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1444 AH
2023 AD |
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Added Date |
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Tuesday, September 12, 2023 |
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Researchers
| سهيل غازي البرادعي | Albaradei, Sohail Ghazi | Researcher | Master | |
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