|
|
|
|
Ecology Publications & Forms |
|
|
|
|
|
Ecology Publications & Forms |
| Title | Investigation of Discharge from Water Treatment Plant Filter Backwash |
||||
|
|||||
| VIEW NOW |
Investigation of Discharge from Water Treatment Plant Filter Backwash (Number of pages: 53) (Publication Size: 4204KB)
|
||||
| Author(s) | Christopher Martin | ||||
| Description | One thing that water treatment plants have in common is the need to clean out the waste materials collected by the treatment system filters. The clean-out method most often used is called “backwashing.” In this process, clean water is run backwards through the treatment filter to flush the accumulated waste material out of the filter. This backwash water and the accumulated waste material are then discharged as a waste stream. The purpose of this project is to assess a selection of water treatment types that dispose of their treated filter backwash water onto the ground. This project entailed collection and analyses of samples of treated backwash water and soils from 16 different water systems around the state. The data did suggest that wastewater discharges from WTPs generally tend to increase the CEC-normalized specific conductance and concentrations of arsenic, chloride, and the hydroxyl ion (pH) in disposal site soils. However, for uncertain reasons, normalized contaminant concentrations in disposal site soils were relatively less than those in background soils at the two of the WTPs. Therefore, given the absence of significant concordance between wastewater concentrations and normalized disposal site impacts for any of the pollutants, no broad associations can be drawn. |
||||
| REQUEST A COPY
|
The mission of the Department of Ecology is to protect, preserve, and enhance Washington’s environment. To help us meet that goal, please consider the environment before you print or request a copy.
ADA Accessibility The Department of Ecology is committed to providing people with disabilities access to information and services by meeting or exceeding the requirements of the Americans with Disabilities Act (ADA), Section 504 and 508 of the Rehabilitation Act, and Washington State Policy #188. Visit Ecology’s website for more information. |
||||
| Contact | Christopher Martin at 425-577-3854 or cmar461@ecy.wa.gov | ||||
| Keywords | water treatment, backwash, discharge to ground, filter cleaning | ||||
| WEB PAGE | Groundwater |
Copyright © Washington State Department of Ecology. See https://ecology.wa.gov/About-us/Accountability-transparency/Our-website/Copyright-information.
|