tailieunhanh - Handbook of Water and Wastewater Treatment Plant Operations - Chapter 7

Máy thủy lực: Bơm 1. Mực nước cao trong Clearwell phải được đặt ở mặt đất vì bảng nước ngầm. 2. Mức nước ở đầu của quá trình đơn vị đào tạo phải được 25 ft phía trên mặt đất. 3. Đa số các quá trình đơn vị trong nửa đầu của quá trình đào tạo phải được nâng lên, trừ khi một trạm bơm được bao gồm trong các quá trình đào tạo đơn vị. Một trang web bằng phẳng và mức độ không phải là lựa chọn tốt nhất cho loại hình này của nhà máy xử lý. Các. | 7 Hydraulic Machines Pumps Pumping facilities are required wherever gravity can t be used to supply water to the distribution system under sufficient pressure to meet all service demands. Regarding wastewater pumps are used to lift or elevate the liquid from a lower elevation to an adequate height at which it can flow by gravity or overcome hydrostatic head. There are many pumping applications at a wastewater treatment facility. These applications include pumping of 1 raw or treated wastewater 2 grit 3 grease and floating solids 4 dilute or well-thickened raw sludge or digested sludge sludge or supernatant return and 5 dispensing of chemical solutions. Pumps and lift stations are used extensively in the collection system. Each of the various pumping applications is unique and requires specific design and pump selection considerations. Where pumping is necessary it accounts for most of the energy consumed in water supply and or wastewater treatment INTRODUCTION Early in the preliminary engineering design phase it is important to establish the hydraulic grade line across the plant. This is because both the proper selection of the plant site elevation and the suitability of the site to accommodate all unit processes requiring specific water elevations and depths of structures depend on this consideration. Kawamura points out that the importance of designing the correct hydraulic grade line across the plant can best be understood through example. Consider for example the initial design of a conventional water treatment plant. Most conventional water treatment plants required 16 to 17 ft of headloss across the plant. This means that a difference of 16 to 17 ft must exist between the water level at the head of the plant and the high water level in the clearwell which is the end of the treatment plant unit process train. Treatment plants using preozonation as well as postozonation and granular activated carbon adsorption processes require almost 25 ft of