Section Env-Wq 713.07 - Sequencing Batch Reactors(a) Sequencing batch reactor (SBR) design shall be based on experience at comparable facilities and meet the applicable requirements of Env-Wq 713.01 through Env-Wq 713.05 except as modified in this section.(b) SBRs shall be designed and constructed to allow for static fill, mixed fill, and aerated fill to allow for operational flexibility.(c) More than 2 tanks shall be provided, unless one of the following is provided: (1) An influent flow equalization tank sized to hold a minimum of 2 design capacity decantable volumes; or(2) Provisions to allow SBR tanks to operate in a continuous flow-through mode during emergency operations.(d) System sizing shall be based on aerated SRT.(e) System reliability with any single SBR tank out of service and the instantaneous flow delivery shall be evaluated in the design of decanter weirs and approach velocities.(f) The decanter shall not create a vortex or take in floatables or sludge.(g) Scum removal shall be provided.(h) The SBR design shall include in-place dewatering capability and provisions for transferring mixed liquor between the SBR tanks.(i) Each SBR tank shall be capable of wasting sludge during each cycle.(j) If blowers are provided, blowers shall meet the requirements of Env-Wq 713.02 through 713.05.(k) Mechanical mixing independent of aeration shall be provided for all systems where biological phosphorous removal or denitrification is required, with mixing equipment sized to thoroughly mix the entire basin from a settled condition within 3 minutes without aeration.(l) Post-SBR tank flow equalization shall be provided to equalize flow variations and designed to meet the following criteria:(1) Hold a minimum of one design capacity decantable volume;(2) Provide a means to return the decanted effluent to the headworks for additional treatment; and(3) Provide a means to remove solids from the tank bottom.(m) An automatic process control having an uninterruptible power supply with electrical surge protection shall be provided.(n) Manual override shall be provided in addition to automatic process control. Both automatic and manual controls shall allow independent operation of each tank.(o) Controls shall allow at least 20 minutes of settling between the react and decant phases.N.H. Code Admin. R. Env-Wq 713.07
(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.