[Code of Federal Regulations]

[Title 40, Volume 22]

[Revised as of July 1, 2005]

From the U.S. Government Printing Office via GPO Access

[CITE: 40CFR141.76]



[Page 456-457]

 

                   TITLE 40--PROTECTION OF ENVIRONMENT

 

         CHAPTER I--ENVIRONMENTAL PROTECTION AGENCY (CONTINUED)

 

PART 141_NATIONAL PRIMARY DRINKING WATER REGULATIONS--Table of Contents

 

                  Subpart H_Filtration and Disinfection

 

Sec. 141.76  Recycle provisions.



    (a) Applicability. All subpart H systems that employ conventional 

filtration or direct filtration treatment and that recycle spent filter 

backwash water, thickener supernatant, or liquids from dewatering 

processes must meet the requirements in paragraphs (b) through (d) of 

this section.

    (b) Reporting. A system must notify the State in writing by 

Decemeber 8, 2003, if the system recycles spent filter backwash water, 

thickener supernatant, or liquids from dewatering processes. This 

notification must include, at a minimum, the information specified in 

paragraphs (b)(1) and (2) of this section.

    (1) A plant schematic showing the origin of all flows which are 

recycled (including, but not limited to, spent filter backwash water, 

thickener supernatant, and liquids from dewatering processes), the 

hydraulic conveyance used to transport them, and the location where they 

are re-introduced back into the treatment plant.

    (2) Typical recycle flow in gallons per minute (gpm), the highest 

observed plant flow experienced in the previous year (gpm), design flow 

for the treatment plant (gpm), and State-approved operating capacity for 

the plant where the State has made such determinations.

    (c) Treatment technique requirement. Any system that recycles spent 

filter backwash water, thickener supernatant, or liquids from dewatering 

processes must return these flows through the processes of a system's 

existing conventional or direct filtration system as defined in Sec. 

141.2 or at an alternate location approved by the State by June 8, 2004. 

If capital improvements are required to modify the recycle location to 

meet this requirement, all capital improvements must be completed no 

later than June 8, 2006.

    (d) Recordkeeping. The system must collect and retain on file 

recycle flow information specified in paragraphs



[[Page 457]]



(d)(1) through (6) of this section for review and evaluation by the 

State beginning June 8, 2004.

    (1) Copy of the recycle notification and information submitted to 

the State under paragraph (b) of this section.

    (2) List of all recycle flows and the frequency with which they are 

returned.

    (3) Average and maximum backwash flow rate through the filters and 

the average and maximum duration of the filter backwash process in 

minutes.

    (4) Typical filter run length and a written summary of how filter 

run length is determined.

    (5) The type of treatment provided for the recycle flow.

    (6) Data on the physical dimensions of the equalization and/or 

treatment units, typical and maximum hydraulic loading rates, type of 

treatment chemicals used and average dose and frequency of use, and 

frequency at which solids are removed, if applicable.



[66 FR 31103, June 8, 2001]