Section Env-Wq 716.10 - Mechanical Sludge Thickening(a) Gravity belt, rotary drum, dissolved air flotation, screw presses, and centrifuges shall be acceptable for mechanical thickening of primary, secondary, and combined sludges.(b) A means of chemically conditioning sludges prior to mechanical thickening that meets the requirements of Env-Wq 716.12 shall be provided.(c) Mechanical thickeners shall be capable of processing the maximum weekly sludge production in 30 hours, unless the equipment is designed to be operated unmanned.(d) If any period of unmanned operation is anticipated as a normal operating condition, then appropriate instrumentation and fail safe monitoring and alarms shall be provided.(e) Where duplicate units are not provided, a contingency plan shall be submitted with the basis of design and sludge storage facilities shall be provided that are adequate to store sludge for the period of time anticipated for repairs to be made if the dewatering device is taken out of service for repair.N.H. Code Admin. R. Env-Wq 716.10
Adopted byVolume XXXIV Number 46, Filed November 13, 2014, Proposed by #10693, Effective 10/15/2014, Expires10/15/2024.