tailieunhanh - AERATION: Principles and Practice ( VOLUME 11 ) - Chapter 9 (end)

Vận hành và bảo trì Mục tiêu chính của việc thiết kế các hệ thống sục khí để cung cấp một hoạt động có hiệu quả với chi phí thấp nhất có thể có giá trị hiện tại, duy trì một sự cân bằng giữa đầu tư ban đầu và hoạt động lâu dài và bảo dưỡng (O và M) chi phí. Nhiều dài hạn O và M chi phí được xác định bởi khả năng và hạn chế thiết kế ban đầu vào hệ thống. Tuy nhiên, một số yếu tố dưới sự kiểm soát của các nhân viên hoạt. | Q Operation and J Maintenance The principal objective of the design of aeration systems is to provide an effective operation with the lowest possible present worth cost maintaining a balance between initial investment and long-term operation and maintenance O and M expenditures. Many long-term O and M expenditures are determined by the capabilities and constraints initially designed into the system. However several factors under the control of the operation staff will have a significant effect on long-term O and M costs. OPERATION Start-Up Diffused Air Prior to start-up of the aeration system the following steps should be followed when placing an empty aeration basin into service. Check air piping and diffuser system and repair any loose joints cracked piping and other defects. Confirm that piping is free of debris such as rust or construction residue. Check to make sure that diffusers are installed according to manufacturer s specifications . tube diffusers are tightened and properly oriented gaskets and O-ring seals are elastic and properly seated the system is level and bolts or other hardware used to apply an external sealing force are properly adjusted. Follow manufacturer s specifications in feeding air to the diffuser system before they are submerged. Always feed at least at the minimum recommended airflow rate per diffuser to prevent backflow of wastewater through the diffusers and into the air piping. Fill the aeration basin to a level of about 30 cm 12 in above the diffusers. Observe the air distribution and check for significant leaks or maldistribution. Correct problems as needed. Continue to fill aeration basin while monitoring and adjusting airflow rate. Adjustment upward will be required as increase in water level will increase back pressure. Operate the condensation blowoffs one at a time until the air delivery system is free of moisture. Adjust flow rate of wastewater and return sludge and airflow rates to meet desired operating .