treatment and zero discharge of effluent from a community septic tank
Jacky Foo
Title: Small scale systems for treatment and zero discharge of
effluent from a community septic tank that receives 11 m3 (2500
gallons) influent per day.
Date: July 2007
Virtual Venues: IOBB-DRUPAL or @googlegroups.com
(i) IOBB-DRUPAL : http://www.iobbnet.org/drupal/forum/152
* email jacky.foo @ gmail.com for a free "guest account". Please give
your "real name", and country of residence
or
(ii) Googlegroups.com:
email list/webforum: http://groups.google.com/group/pk-effluent
to subscribe for discussion messages via email, send a blank to pk-
effluent-...@googlegroups.com
+++++++++
At a remote locality near Islamabad (Pakistan), effluent from septic
tanks of some 15 or 16 houses (about 50 persons ) is currently
disposed off into a nearby stream. There is a plan to divert all the
effluent to one location and into a properly built septic tank (for
about 2500 gallons or 11,365 m3 per day influent) and to aim for an
onsite zero-discharge of effluent.
IOBB invites participants to the Internet Workshop to discuss the
case
study with Mr. Liaqat Hayat. You are welcomed to provide suggestions
and to discuss your experience and advice on small scale technologies
that can offer zero water discharge of effluent from the septic tank.
++++++
This e-workshop is organised by the IOBB Working Group on Integrated
Biosystems (http://www.iobbnet.org/wg/ibs07) and the IOBB Pakistan
Chapter (see http://groups.google.com/group/iobb-pakistan/about and
http://groups.google.com/group/IOBB-PAC/about)
Jacky Foo
From: Liaqat Hayat [liaqat-...@hotmail.com]
Presentation and Background of the Problem
There is a remote locality near Islamabad where waste domestic water
from individual 15 or 16 houses are disposed off to a nearest stream
in the environment through small septic tank provided with each house
and later through a disposal pipe. I intend to divert the accumulated
waste water at one location through a properly built septic tank as
per conceptual design enclosed near the disposal site i.e. at stream
location. The existing septic tank accumulating all this water is in
bad shape and has to be discarded.
I intend to carry out the design work followed by a vetting exercise
of the same with comments from participants who are familiar and
experienced in putting up constructed wetlands (CWL). After this e-
workshop, I intend to construct a suitable CWL with local materials.
The site is clay and sand mixed type and hence I feel that excavated
surface has to be given a mud plaster membrane to avoid seepage to the
underground.
The third phase shall be selection of wetland plants suitable for this
project. I am considering CWL option as I aspect low percentage of the
suspended solids and COD concentration below 500 mg per liter. I am
still not clear for the sludge drying and disposal aspects.
Finally, I like to use the effluent from CWL for surface irrigation,
if the quality of the effluent is okay. I like to also monitor main
parameters of quality like BOD, TSS, TDS and pathogens etc. regularly
at five entry / exit points in the system to evaluate and monitor the
whole system as a pilot project for subsequent application.
My initial investigation for type of wetland plants for this project
reveal that from Pakistan's point of view Vetivergrass Chrysopogon
zinzanioides (common name khas khas grass) can be a potential species
but some studies need to be done before finalizing this aspect in a
scientific manner and would very much like if some aspects of this are
covered in the e-workshop.
Regards,
LIAQAT HAYAT
3-A, Street 70,
Sector: F-8/3
Islamabad, Pakistan.
Cell: 0333-5610760