Lecture_4_ESM214_05

Lecture_4_ESM214_05 - ESM 214 Lecture 4: Wastewater...

Info iconThis preview shows pages 1–15. Sign up to view the full content.

View Full Document Right Arrow Icon
ESM 214 Lecture 4: Wastewater Treatment Overview, Reactors W’05 T. Holden
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Onsite Wastewater Treatment 25% of US population relies on it On site treatment typically (95%) is by septic system and associated leachfield Regulations and design are somewhat standardized, but public health authority (county) regulates and manages.
Background image of page 2
Septic system schematic
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Septic system schematic
Background image of page 4
Septic Tank 1000 gal typ. Concrete Gravity in/out typ. “dosing” alternative
Background image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Leach (absorption) field tank 10 ft from house field 100 ft from well or pond
Background image of page 6
Leach field cross section 4 inch diameter drain pipe typ. 4 – 6 ft deep trench typ. 2 ft. wide trench 2 – 3 ft. gravel depth
Background image of page 7

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Good leach field performance
Background image of page 8
“Bad” leach field performance Shallow clay lense.
Background image of page 9

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Factors effecting failure of the septic system “bad” soil Clogging (biofouling) High water table Roots Physical damage
Background image of page 10
Percolation in leach field design Consult your local authority for the real facts !! Example: Measure percolation, pick application rate from table, “choose” allowed flow rate calculate area (sf)
Background image of page 11

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Centralized wastewater treatment Required where: Population density is too high to support onsite treatment Soils are unsuitable for onsite treatment Consists of: Collection and conveyance system Wastewater Treatment Plant (WTP, WWTP) owned by community or sewerage agency (a.k.a. treatment district)
Background image of page 12
Regulation Federal Clean Water Act (CWA) protects “waters of the state” CWA administered by most states; in CA it is the SWRCB NPDES (national pollutant discharge elimination system) necessitates a permit to discharge to surface water (river, ocean, etc.)
Background image of page 13

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Regulatory Linkages
Background image of page 14
Image of page 15
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 08/06/2008 for the course ESM 214 taught by Professor Holden during the Spring '05 term at UCSB.

Page1 / 42

Lecture_4_ESM214_05 - ESM 214 Lecture 4: Wastewater...

This preview shows document pages 1 - 15. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online