GAC20 definition

GAC20 means granular activated carbon filter beds with an empty-bed contact time of 20 minutes based on average daily flow and a carbon reactivation frequency of every 240 days.
GAC20 means granular activated carbon filter beds with an empty-bed contact time of twenty minutes based on average daily flow and a carbon reactivation frequency of every two hundred forty days.
GAC20 means granular activated carbon filter beds with an empty-bed contact time of 20 minutes based on average daily flow and a carbon reactivation frequency of every 240 days. (40 C.F.R. §141.2 (July 1, 2011))

Examples of GAC20 in a sentence

  • For compliance with the MCLs for TTHM and HAA5 as LRAAs, the following are the BATs: enhanced coagulation or enhanced softening, plus GAC10; GAC20, as defined in section 5-1.1 of this Subpart; or nanofiltration with a molecular weight cutoff less than or equal to 100 Daltons.

  • The “GAC20 + Chlorine Dioxide” step applies to all plants with initial technology level less than or equal to the “GAC20 + Chlorine Dioxide,” except for:• Plants with ozone in initial process trains (such plants would skip directly to the “GAC20 + Raw Water Ozone” decision tree step) • Softening plants• Small systemsThis step is implemented in the same manner as the “GAC10 + Chlorine Dioxide” step, except a GAC20 system is added instead of a GAC10 system.

  • Therefore technologies shift toward more advanced treatments due to the operational difficulties of ozone and chlorine dioxide.• GAC20 is judged to be preferred over GAC10 for smallest systems.With no additional Crypto inactivation requirements, slightly less overall use of advanced technologies is predicted for small systems.

  • This step is implemented similarly to the “GAC10 + Settled Water Ozone” step except that GAC20 is used instead of GAC10.

  • GAC20 means granular activated carbon filter beds with an empty-bed contact time of 20 minutes based on average daily flow and a carbon reactivation frequency of every 240 days.

  • The “GAC20 + Raw Water Ozone” step applies to all plants with initial technology level less than or equal to “GAC20 + Raw Water Ozone,” except for:• Softening plants• Small systemsThis step is implemented in the same manner as the “GAC10 + Raw Water Ozone” step, except a GAC20 system is added instead of a GAC10 system.

  • The “GAC20 + UV” step applies to all plants with initial technology level less than or equal to “GAC20 + UV,” except for:• Plants with ozone in initial process trains (such plants would skip directly to the “GAC20 + Raw Water Ozone” decision tree step) • Softening plants• Small systemsThis step is implemented in the same manner as the “GAC10 + UV” step, except a GAC20 system is added instead of a GAC10 system.

  • Second, immediate and periodic chlorination of the pond was recommended.

  • Comment:The following treatment technique requirements need to be added: 40 CFR 141.2 definitions of GAC10 and GAC20, 40 CFR 141.64(a)(2), 40 CFR 141.64(b)(1)(ii), 40 CFR 141.64(b)(2)(ii - ii).

  • ANOVA test showed Filter 3 (10 cm sand/20 cm GAC/20 cm sand) presented the best performance for DEET removal compared to the other four filters (p<0.05).


More Definitions of GAC20

GAC20 means granular activated car- bon filter beds with an empty-bed contact time of twenty minutes based on average daily flow and a carbon reactiva- tion frequency of every two hundred forty days.
GAC20 means “GAC20” as defined in 40 CFR § 141.2, reprinted in Appendix B.
GAC20 means granular activated carbon filter beds with an empty-bed contact time of 20 minutes based on average daily flow and a carbon reactivation frequency of every 240 days."Governmental entity" means the Commonwealth, a town, city, county, service authority, sanitary district or any other governmental body established under the Code of Virginia, including departments, divisions, boards or commissions.
GAC20 means granular activated carbon filter beds with an empty-bed contact time of twenty

Related to GAC20

  • GAC10 means granular activated carbon filter beds with an empty-bed contact time of 10 minutes based on average daily flow and a carbon reactivation frequency of every 180 days, except that the reactivation frequency for GAC10 used as a best available technology for compliance with MCLs under subsection 9.2.1.2 shall be 120 days.

  • Sailboat means the same as that term is defined in Section 73-18-2.