Section Env-Wq 713.08 - Aerated Lagoon Design: General Requirements(a) To develop final design parameters for aerated lagoons, actual operating data shall be used, if available.(b) If actual data is not available, the aerated lagoon system design for minimum detention time in days (t) shall be estimated for each aerated cell by dividing the percent of BOD5 to be removed in the aerated lagoon (E) by the product of 2.3 multiplied by the reaction rate coefficient for an aerated lagoon in base 10 (k1) multiplied by the result of subtracting E from 100, as shown in the following formula: t = E / 2.3k1(100-E)
(c) For purposes of (b), above, the reaction rate coefficient (k1) shall be as follows: (1) For domestic wastewater, 0.12/day at 68°F, equivalent to 20°C, and 0.06/day at 34°F, equivalent to 1°C, unless data is available to indicate a more appropriate k1 value for the specific site;(2) For domestic wastewater that includes some industrial wastes, other wastes, and partially treated wastewater, as determined experimentally for various conditions which might be encountered in the aerated ponds; and(3) Conversion of the reaction rate coefficient to other temperatures shall be made based on experimental data.(d) There shall be a minimum of 3 separate cells. Baffles may be used to create up to 2 cells in one lagoon.(e) All aerated lagoon systems shall be designed with piping flexibility to allow isolation of any cell without affecting the transfer and discharge capabilities of the total system.(f) The ability to discharge influent waste load to a minimum of 2 cells or all primary cells in the system shall be provided.(g) The shape of all lagoons shall be such that there are no narrow or elongated portions. Lagoons shall be round, square, trapezoidal, or rectangular with the length not exceeding 3 times the width.(h) Additional lagoon volume of at least 20 percent shall be included for sludge storage and ice cover.N.H. Code Admin. R. Env-Wq 713.08
(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.