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Title: Section 5-1.65 - Best Available Technologies (BATs) for Disinfection Byproduct Control

Effective Date

01/17/2018

5-1.65 Best Available Technologies (BATs) for Disinfection Byproduct Control

 

The following is a table of the best available technology, treatment techniques, or other means available for achieving compliance with the maximum contaminant levels for Bromate, Chlorite, TTHM and HAA5, for public water systems that disinfect their source water. 

 

Water system type

Source type

Disinfection byproduct

Best available technology1

All systems that disinfect their source water

GW; SW;

GWUDI

Bromate

Control of ozone treatment process to reduce production of bromate

Chlorite

Control of treatment processes to reduce disinfectant demand and control of disinfection treatment processes to reduce disinfectant levels

All systems that disinfect their source water

GW; SW;

GWUDI

Total

trihalomethanes

(TTHM);

Haloacetic acids

(five) (HAA5)

Enhanced coagulation or enhanced softening, plus GAC10; or nanofiltration with a molecular

weight cutoff ≤1000 Daltons; or

GAC20

Consecutive systems:

applies only to the disinfected water that consecutive systems buy or otherwise receive

GW; SW;

GWUDI

Total

trihalomethanes

(TTHM);

Haloacetic acids

(five) (HAA5)

Systems serving ≥10,000:

Improved distribution system and storage tank management to reduce residence time, plus the use of chloramines for disinfectant residual maintenance

Systems serving <10,000:

Improved distribution system and storage tank management to reduce residence time

 

1 Softening that results in removing at least 10 mg/L of magnesium hardness (as CaCO3), measured monthly and calculated quarterly as a running annual average can be the best available technology for controlling disinfection byproduct precursors.

 

Volume

VOLUME A (Title 10)

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