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TEXAS COMMISSION on ENVIRONMENTAL QUALITY. PROPOSED STUCTURE FOR CHAPTER 217. < Subchapter A Administrative Provisions < Subchapter B Design Bases < Subchapter C Convention Collection System. PROPOSED STUCTURE FOR CHAPTER 217. < Subchapter D Alternative Sewer Collection System

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proposed stucture for chapter 217
PROPOSED STUCTURE FOR CHAPTER 217

<Subchapter A Administrative Provisions

<Subchapter B Design Bases

<Subchapter C Convention Collection System

proposed stucture for chapter 2173
PROPOSED STUCTURE FOR CHAPTER 217

<Subchapter D Alternative Sewer Collection System

<Subchapter E Preliminary Treatment Units

<Subchapter F Activated Sludge

proposed stucture for chapter 2174
PROPOSED STUCTURE FOR CHAPTER 217

<Subchapter G Fixed Film and Filtration

<Subchapter H Natural Systems

<Subchapter I On-site Treating Over 5,000 Gallons Per Day

proposed stucture for chapter 2175
PROPOSED STUCTURE FOR CHAPTER 217

<Subchapter J Sludge

<Subchapter K Disinfection

<Subchapter L Safety

subchapter a
SUBCHAPTER A

Administrative Provisions

<The proposed rule grandfathers existing facilities to the rule which

was in place at the time of the facility's construction and original

plans and specifications approval. This will tell the engineer and

the owner of the facility what parts of a plant that will have to

meet the latest design criteria during a upgrade or modification.

<The rule requires an operation and maintenance manual to be

developed as part of the facility design. The rule provides

guidance regarding which types of information should be included

in the O&M manual. The existing criteria only stated O&M

manual be furnished to the system owner.

<Clarifies TCEQ will not enforce or review for compliance with

rules of other entities.

subchapter b
SUBCHAPTER B

Design Bases

<The major change to this subchapter is to allow the design engineer to design

the plant based on the annual average flow instead of the max. monthly flow.

This will allow a city to design small treatment units or to utilize existing units

without need for some expansion.

<The draft criteria will allow a city to rerate their plant based on a lower organic

loading. The criteria provides options for rerating plants based on influent

organic and flow data.

<The draft criteria provide clearer description of the requirement for back-up

power.

<The criteria will have a section on the reuse of effluent within the treatment

process when ever possible.

subchapter c
SUBCHAPTER C

Conventional Collection Systems

subchapter c9
SUBCHAPTER C

Conventional Collection Systems

<Gravity Pipes

<Lift Stations and Force Main

<Reclaimed Water and Irrigation

Facilities

subchapter d
SUBCHAPTER D

Alternative Sewer Collection Systems

<Vacuum System

<Pressure Sewers

<Small Diameter Variable Grade

Sewer

subchapter e
SUBCHAPTER E

Preliminary Treatment Units

<Removes the requirement for redundant fine screens if coarse

screens and a bypass are provided, unless a credit for organic

reduction as a result of the fine screen is desired.

<The proposed criteria provides more detailed design requirements

for grit removal chambers.

<Requires flow measurement at all facilities and provides for more

detailed design requirements regarding flow measurement.

subchapter f
SUBCHAPTER F

Activated Sludge

subchapter f14
SUBCHAPTER F

Activated Sludge

<Provides design criteria for sequencing batch reactors (SBR).

<Provides a table to determine net solids production.

<Provides the equation for determination of field transfer efficiency.

<Draft rules state the minimum depths for diffuser submergence.

<Provides air flow correction factors for various diffuser

submergence depths.

<Draft criteria changes the limitation on hopper bottom clarifiers

from 25,000 gpd to 10,000 gpd or less.

<The draft criteria requires multiple basin and clarifiers for flows

greater than 400,000 gpd.

subchapter g
SUBCHAPTER G

Fixed Film Filtration

subchapter g16
SUBCHAPTER G

Fixed Film Filtration

<The major change to this part of the criteria is to give

credit to trickling filters for nitrification.

<The other changes are to provide the design engineer

with better guidelines for their design of filters and fixed

film reactors

subchapter h
SUBCHAPTER H

Natural System

<More flexibility in the design of wetlands systems.

<Updated criteria for overland flow systems.

<Add greater flexibility for liner installations.

<Criteria for evaporative pond systems.

<Criteria for integrated facultative lagoons.

<Re-instates the design criteria for Imhoff tanks.

subchapter j19
SUBCHAPTER J

Sludge

<Provides criteria for chemical pretreatment of residuals.

<Provides design criteria for sludge dewatering units

<Requires sludge storage for all facilities and provides design

criteria for sludge storage.

<Provides criteria for sludge thickening technologies including:

Ímechanical thickeners,

Ídissolved air flotation thickeners, and

Ícentrifugal thickeners.

subchapter k
SUBCHAPTER K

Disinfection

  • Requirements for disinfection, dechlorination,

post aeration and sampling point locations.

  • <Providing criteria for sulfur dioxide
  • dechlorination systems, for sodium hypochlorite
  • and sodium bisulfite disinfection.
  • <Updates the design criteria for ultraviolet light
  • disinfection.
subchapter l22
SUBCHAPTER L

Safety

<Safety Audit.

<Job Hazard Analysis and Protective

Equipment Lists