Section Env-Wq 709.03 - Grit Removal Facilities(a) Grit removal facilities shall be provided for all WWTPs for protection of downstream processes and equipment.(b) If grit is removed by a means that causes the grit to contain excess organics or water, or both, for the method of final grit disposal to be used, the WWTP shall include grit washing and dewatering facilities as necessary. Impervious surfaces with drains shall be provided for grit handling areas. Grit conveying equipment shall be designed to avoid loss of material and shall be protected from freezing. A pressurized water supply shall be provided for cleanup.(c) Where a single mechanically-operated grit removal device is used, auxiliary manually-operated grit removal equipment shall be provided. Design shall include provisions for automatic diversion of the entire sewage flow through the by-pass grit removal device should the mechanical unit fail.N.H. Code Admin. R. Env-Wq 709.03
Amended byVolume XXXIV Number 46, Filed November 13, 2014, Proposed by #10693, Effective 10/15/2014, Expires10/15/2024.