Archive

Posts Tagged ‘Wastewater’

Paper: Compliance with Standards and Immerging Issues of Household Sewage Disposal Systems – Sri Lanka

Mon, 06Jan2014 Comments off

– No. 2 2013,
H. M. K. S. Bandara and M. M. M. Najim
Faculty of Science University of Kelaniya Kelaniya
Sri Lanka

ABSTRACT

Urban centers are highly significant with limited space together with the rising urban population.
Most of the houses and buildings are attached with some kind of
a sewage disposal facility as central sewage disposal systems are limited.
Urbanization is expected to create many problems in terms of black water disposal
due to limitation of land. A study was done in Gampaha municipality area, an
urban center, where there is no central sewage treatment facility. The objectives of
the study were to analyze the current situation of the black water disposal system in
the study area and to identify the shortcomings of the black water disposal system comparing with the standards.
The study was conducted within the urban center in
five GN divisions. Random samples of 44 households were selected to represent all
the five GN divisions. Selected households were interviewed to collect basic data
needed and physical measurements were also taken where necessary. The data
categories collected are household information, toilet type and size, desludging
interval and distance to nearest well. The code of practice for the design and
construction of septic tanks reports that 80% of urban communities use septic tanks
for sewage disposal, but this study reveals that only 18% of the population uses
septic tanks. Over 82% uses typical soakage pits that are constructed with loosely
constructed brick walls and bare bottom open to soil for their sewage disposal.
Over 68% of the households have their toilet pits within 15m to the nearest well,
which is below the recommended distance. Only 30% of the households comply with
over 15m to the nearest well that is recommended for septic tanks. The
recommended distance for the soakage pits to the nearest well is 30m and only 9%
of the households meet this standard. The black water disposal pits are over sized in
general, so that the desludging interval is more than 10 years. Recently constructed
houses, due to limitation of space, have reduced the size of the pits reducing f desludging interval.
The construction and placement of septic tanks or soakage pits in the area have not complied with the standards.

Paper: Understanding the Poor Performance of Urban Sewerage System – case study

Mon, 21Oct2013 Comments off

Author: Annatoria Chinyama, Tendai Toma

Department of Civil and Water Engineering, National University of Science and Technology, P.O Box AC939, Ascot, Bulawayo, Zimbabwe

Understanding the Poor Performance of Urban Sewerage Systems – A Case of Coldstream High Density Suburbs, Chinhoyi, Zimbabwe

Abstract:

The population of Coldstream High Density Suburbs in Chinhoyi, Zimbabwe is increasing and the sewerage system shows signs of poor performance. The frequency of reported sewerage system blockages in the suburb increased from 43 per month to 65 per month between April 2012 and March 2013. The suburb has also been experiencing water shortages. An increasing population and low water supply versus overflowing sewage is a potential health risk.

The main objective of this paper was to investigate the causes of the sewer system poor performance. This was achieved by assessing the sewer system infrastructure as well as the operation of the system. The impact of the behaviour of residents on the performance of the system was also discussed. The main components of the infrastructure (manholes and sewers) were physically checked for soundness. The operation of the system was assessed by a hydraulic analysis of discharge, depth of flow and velocity of flow in the sewers. Questionnaires were used to investigate the impact of the behaviour of residents on the performance of the sewer system.

It was found that 4% of the components of the sewer system infrastructure were below standard and the collector main sewer was the one mainly affected. 68% of the sewers along the collector main had velocity of flow below 0.6m/s and all the sewers had depth of flow below 50%. Of the residents interviewed, 90% dumped solid wastes in the sewers and 43% did so because they were unaware of the impact.

It was concluded that the sewer system failed to meet standard because the sewer system fails to self-cleanse the solid waste dumped by residents in the sewers due to water shortages. It is recommended that the municipality raises awareness among residents and some of the infrastructure should be rehabilitated. more…

Turning recycled wastewater into a commoditized resource : Valérie Issumo at TEDxLausanne

Sun, 03Mar2013 1 comment

The talk is titled: Wastewater, a resource or a weapon of mass destruction? 

Valérie shows us how to turn recycled wastewater into a commoditized resource, improve water sanitation, provide efficient water usage, and reduce price volatility.

….

Valérie Issumo is the CEO of Prana Sustainable Water company (http://www.pranasustainablewater.ch) . An economist, she worked for 15 years as a soft commodities trader and as a trainer in Belgium, Uruguay, Cameroon and Switzerland. Throughout her career she has fought for sustainability and risk mitigation in the entire value chain of traded goods. She is a university lecturer and also a consultant for food security, socially responsible investments, pricing ecosystems and the assessment of water interdependencies. Valérie holds an MBA, has studied at various international water centres, and was a recipient of the Prize of the Belgian Minister of Foreign Trade.

Prana Sustainable Water is acting for the following challenges:

  • Reducing the 80% untreated wastewater (UNEP) by matching offers and pre-paid demands of treated water allowing to finance sanitation and restore the public water quality as common good for not hindering growth and strategies.
  • Water is the underlying commodity of every goods or services: please check www.cdproject.net/water and www.waterfootprint.org: : Prana Sustainable Water has designed Ethical Water Titles© – futures contracts – to commoditize treated wastewater as tradable resource on the Ethical Water Exchange platform or commodities exchange for water procurement and price security.
  • Scaling-up clean technologies for wastewater:the members of Prana Sustainable Water Club active in wastewater can benefit organized markets through solvent demands of recycled water via Ethical Water Titles© allowing to leapfrog the leverage effects solving simultaneously water, health, economic, environmental and social issues.
  • Offset water consumption : wastewater can be recycled on an infinite basis. Prana Sustainable Water boosts responsible productions or services prioritizing reuse water with the automatic respect of the Water Exploitation Index growingblue.com and storing part of recycled wastewater into green water bnks© for philanthropy, reforestation and production of green/rain water, energy, public services like fires..etc…
  • Defense and food security Our motto is to incentivize responsible water use to produce:
    – what makes sense (prioritizing commoditized recycled water from wastewater for Human Rights, for water footprints of functional food or with high nutritional value and ecosystems services),
    – where it makes sense (according to the impact),
    – how it makes sense (with treated wastewater and sludge energy).

More:

Prana Sustainable Water site pages

source of materials YouTube posting & Prana Sustainable Water

 

Stanford Nitrogen Group – Energy from Waste Nitrogen – Wastewater Treatment research

Mon, 28Jan2013 Comments off

 When looking at sanitation/wastewater treatment and making it economically feasible for more parts of the world, this is very interesting research.   Some will say it has roots in the fact that there is “gold”  in out crap…

Related links to this research:

Wastewater as a Clean Energy Source:

  …On May 1, a panel of judges awarded the $100,000 National University Clean Energy Business Challenge prize to the Stanford team for its project to convert nitrogen waste into nitrous oxide that is then used for clean power generation….

Paper: Nitrogen removal with energy recovery through N2O decomposition:

by Yaniv D. Scherson ,  George F. Wells ,  Sung-Geun Woo ,  Jangho Lee ,  Joonhong Park ,  Brian J. Cantwell and Craig S. Criddle

A new process for the removal of nitrogen from wastewater is introduced. The process involves three steps: (1) partial nitrification of NH4+ to NO2; (2) partial anoxic reduction of NO2 to N2O; and (3) N2O conversion to N2 with energy recovery by either catalytic decomposition to N2 and O2 or use of N2O to oxidize biogas CH4. Steps 1 and 3 have been previously established at full-scale. Accordingly, bench-scale experiments focused on step 2. Two strategies were evaluated and found to be effective: in the first, Fe(II) was used to abiotically reduce NO2 to N2O; in the second, COD stored as polyhydroxybutyrate (PHB) was used as the electron donor for partial heterotrophic reduction of NO2 to N2O. ….

Researchers use rocket science for sustainable waste treatment process

Normally, we want to discourage these gases from forming,” said Craig Criddle, a professor of civil and environmental engineering and senior fellow at the Woods Institute for the Environment at Stanford. “But by encouraging the formation of nitrous oxide, we can remove harmful nitrogen from the water and simultaneously increase methane production for use as fuel.

Linking the drops of knowledge to form a stream of WASH information: WATSAN, Sanitation, Water, Hygiene, and Global Health

WASH Finance

Costs and funding of water, sanitation and hygiene (WASH) services for all

bacigalupe

Gonzalo Bacigalupe, EdD, MPH

Ross Bailey's Blog

Campaigns and digital innovations

Econosteez

Econemana

stichtingconnectinternational

www.connectinternational.nl

A Page from Tom Paulson

Global Health, Science and Journalism

recyclewater

Just another WordPress.com site

Source News Service Feedback's Blog

Focus Group Interviews to mesure spread, use and impact of IRC Services

Sustainable Sanitation in Emergency & Reconstruction

News of developments and innovations - collected by SuSanA working group 8

Peter J Bury 4 IRC

A journey into a "using a Blog for work" experience @ IRC International Water and Sanitation Centre

Medindo Água

Neste blog são sugeridos sites, textos e trabalhos técnicos sobre conservação, medição e perdas de água. Com o entendimento de que MEDIR é determinar ou avaliar a grandeza ou a quantidade de; calcular; regular; moderar; refrear; proporcionar; ponderar; analisar; ter a extensão de.

Insourced- Dr. Kate Tulenko

Thoughts on a healthier world

The Political Economy of Water Project

About water politics, economics, and other issues surrounding this vital resource.

Environmental Engineering Engenharia do Ambiente

This group aims sharing opportunities between Environmental Engineers / Este grupo tem como objectivo partilhar oportunidades entre profissionais de Engenharia do Ambiente (English / Português)

Global Health Dispatch

Diaries from the Field

%d bloggers like this: