On-Hệ thống xử lý nước thải Nếu bạn sống gần ao, hồ đi từ một khu vực đô thị, có một cơ hội tốt nước thải được xử lý bằng một hệ thống xử lý nước thải tại chỗ, còn được gọi là Hệ thống xử lý tự hoại một cá nhân (ISTS). Hệ thống tự hoại thường được coi là một cách hiệu quả và an toàn cho việc thu thập, xử lý, và xử lý nước thải sản xuất trong phòng tắm, nhà bếp và giặt ủi. Khi hệ thống của bạn được duy trì, nó là môi trường. | 6 On-Site Wastewater Treatment Systems INTRODUCTION If you live near a pond or a lake away from an urban area there is a good chance your wastewater is treated with an on-site wastewater treatment system also called an individual septic treatment system ISTS . Septic systems are generally considered an efficient and safe way for collecting treating and disposing of wastewater produced in your bathroom kitchen and laundry. When your system is properly maintained it is environmentally safe and will last for years. The septic tank. This is what goes in the ground. The septic tank. This shows what is inside. From Olson K. et al. Septic System Owners Guide PC-6583-5 Minnesota Extension Service St. Paul 1995. CONVENTIONAL ON-SITE SYSTEMS Septic Tank and Drainfield That s History . In some homes in Babylon in 2000 . latrines were connected to 18-inch-diameter vertical shafts in the ground. The shafts were lined with perforated clay pipe. Effluent percolated into the surrounding soil. World of Water 2000 There are several types of on-site systems but the most common design consists of three main parts the septic tank the drainfield and the soil beneath the drainfield called the soil absorption field . Septic tank and soil absorption trench. Of the conventional types of septic tank soil absorption systems the trench-style soil absorption field is the preferred system. The typical cost is 3000 to 5000for the complete system. From USEPA. The septic tank is a concrete box about 9 feet long and 5 feet tall buried in the ground just outside your house. Its job is to retain the solid waste produced in your house. The septic tank is usually precast reinforced concrete and is watertight. 2003 CRC Press LLC FROM SCPTlC TANK Cross-section of household facilities septic tank drop box and drainfield trench a sump pump in basement pumps graywater up into septic tank. From USEPA. A soggy drainfield with standing water is a sign of a surface failure. This problem needs to
