Section Env-Wq 713.02 - Activated Sludge: Aeration System Requirements(a) An aeration system shall be designed to:(1) Meet maximum oxygen demand and mixing requirements and maintain process performance with the largest unit out of service;(2) Provide for varying the amount of oxygen transferred in proportion to the load demand on the WWTP; and(3) Have motors, gear housing, bearings, grease fittings, and other parts requiring maintenance in a location that is: a.Accessible under routine operating conditions; andb.Protected from submergence and spray as necessary for proper functioning. (b) The mechanism and drive unit for oxygen transfer shall be: (1) Designed for the expected conditions in the aeration tank in terms of power performance; and(2) Tested and certified by the aerator manufacturer.(c) Each aeration drop leg shall be equipped with:(1) Control valves that have indicator markings for throttling and complete shut off; and(2) Air flow measurement capability.(d) Air filters shall be: (1) Provided in numbers, arrangement, and capacities to furnish at all times an air supply sufficiently free from dust to prevent damage to blowers and clogging of the diffuser system used; and(2) Equipped with a means to measure pressure drop across the air filters.(e) Blowers shall be located in a room that: (1) Is separated from the office, laboratory, or control room by insulated walls to minimize blower noise, such that the noise level does not exceed 90 decibels in the blower room and does not exceed 50 decibels in the office, laboratory, or control room;(2) Has mechanical ventilation; and(3) Is equipped with heat recovery units if economically justified based on life cycle cost analysis.N.H. Admin. Code § Env-Wq 713.02
(See Revision Note at chapter heading for Env-Wq 700) #8590, eff 3-25-06
Amended byVolume XXXIV Number 46, Filed November 13, 2014, Proposed by #10693, Effective 10/15/2014, Expires10/15/2024.