N.H. Code Admin. R. Env-Wq 712.02

Current through Register No. 25, June 20, 2024

Section Env-Wq 712.02 - Chemical Coagulation: Flocculation Tanks

(a) Flocculation following chemical coagulant mixing shall be completed in channels or tanks that meet the following requirements:

(1) At least 2 flocculation tanks or channels having a combined detention period of between 20 and 30 minutes shall be provided;

(2) Mixing shall be balanced to avoid under-mixing or over mixing such that:

a.Chemicals are completely dispersed;

b.Flocculated particles do not settle; and

c.Flocculated particles are not sheared; and

(3) Independent controls for each tank shall be provided.

(b) Settling tank design shall conform to Env-Wq 711.

(c) A means of dewatering all tanks shall be provided.

N.H. Code Admin. R. Env-Wq 712.02

(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.