Alabama Administrative Code › Title 335 - ALABAMA DEPARTMENT OF ENVIRONMENTAL MANAGEMENT › WATER DIVISION - WATER QUALITY PROGRAM › Chapter 335-6-20 - RECLAIMED WATER REUSE PROGRAM › Section 335-6-20-.11 - Municipal Reclaimed Water Treatment, Limitations, and Monitoring Requirements

Current through Register Vol. 42, No. 9, June 28, 2024
(1) Class
				A reclaimed water shall be treated to the secondary treatment levels specified
				in paragraph (3) of this rule. In addition, the water shall be coagulated,
				clarified, filtered, and disinfected or treated by an alternate process
				acceptable to the Department. The Department may require pilot testing or
				demonstration, or may condition acceptance upon the successful outcome of such
				testing or demonstration.
(2) Class
				B reclaimed water shall be treated to the secondary treatment levels specified
				in paragraph (3) of this rule. In addition, the water shall be disinfected to
				meet the requirements set forth in paragraph (3) of this rule. The Department
				may require pilot testing or demonstration, or may condition acceptance upon
				the successful outcome of such testing or demonstration.
(3) The Department may require additional
				treatment, beyond the requirements of this rule, for reclaimed water to be
				injected through an ASR well. An ASR well shall also be subject to the
				requirements of chapter 335-6-8, as applicable.
(4) The table below summarizes Class A and
				Class B reclaimed water requirements. Subparagraphs (a) and (b) of this
				paragraph provide further details regarding the requirements.
Class A Reclaimed Water
Class B Reclaimed Water
Chlorine
No less than 1.0 mg/L entering distribution
								system.
No less than 0.5 mg/L chlorine residual in the
								distribution system prior to being transferred to storage ponds and/or
								distributed to customers.
No less than 1.0 mg/L entering distribution
								system.
No less than 0.5 mg/L chlorine residual in the
								distribution system prior to being transferred to storage ponds and/or
								distributed to customers.
E. Coli
Median of no greater than 18 col/100 mL as
								determined from the last seven days of results.
Results of no greater than 34 col/100 mL in any one
								sample.
Median of no greater than 18 col/100 mL as
								determined from the last seven days of results.
Results of no greater than 34 col/100 mL in any one
								sample.
Turbidity
No greater than 3 Nephelometric Turbidity Units
								(NTUs).
Not applicable
Nitrates + Nitrites
No greater than 10 mg/L monthly average.
No greater than 10 mg/L monthly average.
pH
No less than 6.0 S.U. and no greater than 8.5
								S.U.
No less than 6.0 S.U. and no greater than 8.5
								S.U.
CBOD5
No greater than 10 mg/L monthly average.
No greater than 10 mg/L monthly average.
TSS
Not applicable
No greater than 30 mg/L monthly average.
Total Nitrogen
Monitoring only
Monitoring only
Total Phosphorus
Monitoring only
Monitoring only
(a) Acceptable
				primary disinfectants are chlorine, chlorine dioxide, Ultraviolet Light (UV),
				O-zone, or an equivalent process acceptable to the Department. Chlorine is the
				preferred primary disinfectant. A disinfection application rate must be
				provided to all Class A and Class B reclaimed water to achieve the following:
1. If chlorine is used as the primary
				disinfectant, a suitable contact time must be utilized to ensure that the total
				residual chlorine (TRC) entering the distribution system shall not be less than
				1.0 mg/l. Facilities utilizing another disinfectant other than chlorine must
				add a disinfectant to maintain disinfectant residuals in the distribution
				system such that the minimum chlorine requirements are met.
2. The median number of bacteria of the E.
				coli group does not exceed eighteen organisms per one hundred milliliters, as
				determined from the bacteriological results of the last seven days for which
				analyses have been completed. No sample shall exceed thirty-four organisms per
				one hundred milliliters in any one confirmed sample; and
3. The point of compliance for reclaimed
				water for E. coli shall be at any point in the system following final treatment
				and disinfection contact time. It is required that a TRC of 0.5 mg/l be
				maintained in the distribution system prior to being transferred to storage
				ponds or distributed to customers.