Recovering energy from waste can power Africa | Source: by David Kariuki, Cleanleap, Feb 10 2016.
Production of electricity from waste has the potential of providing up to 83.8 TeraWatt hours (TWh), which is about 20% of the electricity needed in Africa by 2025. This is according to a study co-authored by the European Commission Joint Research Centre (JRC). However, this requires stringent waste management policies to be put in place, and today Africa lacks the adequate infrastructure needed to install these environmentally friendly methods.
Waste to Energy Project
Like some other parts of the world, most of the waste in Africa is burned without tapping the potential of gases (which usually end in pollution) or dumped in landfills without protecting groundwater. Many of the developed countries that have a high percentage of waste to energy recovery, have strict emissions laws that regulate waste handling.
Waste in Africa, according to JRC, can be used to produce energy in two ways. The first is using Waste-to-energy (WTE) incineration plants where the trash is burnt to produce steam that turns turbines. The report notes that these are few in this part of the world because of the high initial costs of establishment. Strict measures are needed to ensure the plants do not pollute the environment via toxic by-products.
WASH in Emergencies Problem Exploration Report: Faecal Sludge Management, 2016. Humanitarian Innovation Fund (HIF).
This report puts forward a few areas for further exploration and development.
Easy to implement, portable toilet systems: New toilet system designs are needed that can allow for the better management of faecal sludge accumulation and can facilitate regular emptying. The designs should also consider the integration of additive mixing and dosing devices.
Standardised guidelines for assessing existing sanitation equipment: Guidelines could propose a method for evaluating available local equipment such as sewer trucks (e.g. number, state, storage capacity, spare parts and connecting), and other tools such as de-sludging pumps.
New protocols for the treatment and control of faecal sludge accumulation: Studies have shown that it is more reliable to consider the control of the accumulation before the latrine is in use, than to try to absolutely reduce existing sludge volume. It is clear that some additives work but further research is needed to understand how and when to use these. Research and experimentation studies should continue to test and compare bio-additives, as well as define new protocols and objectives.
Evaluation of speedy aerobic and anaerobic treatment concepts: Additional research needs to be carried out to assess the field effectiveness of both speedy aerobic and anaerobic treatment concepts in reducing the volume of sludge collected from pits. For anaerobic process concepts, feasibility studies can also help determine if biogas resulting from the process can be used for downstream application.
Guidelines for assessing and improving dumping sites: Practical guidelines for assessing existing dumping sites would be very beneficial, as well as suggested solutions and options on how to improve the capacity of storing and disposing of faecal sludge during a period of emergency. However, even with such guidelines, the process would not be straightforward as setting up or improving a dumping site requires skilled people, qualified in the area of environmental engineering.
Standard for Sewage Treatment Plants in Developing Countries. Source: PR Newswire, Jan. 19, 2016.
A standard for sewage treatment plants is to improve the sanitation situation in developing countries. The international technical services group TÜV SÜD has been awarded a grant from the Bill & Melinda Gates Foundation to assess facilities aimed at 1,000 to 100,000 people. The project started in November 2015 and is designed for a term of seven months.
Over one-third of the global population do not have access to functioning sanitation facilities and sewage disposal. This lack of sanitation adversely affects social and economic development in the countries concerned and is also a source of significant environmental pollution. One challenge is the treatment of sludge that even if collected in conventional pit latrines or sewage tanks often there is a lack of proper disposal. “Sustainable improvement of this situation requires innovative technologies that support decentralized solutions for sanitation facilities and wastewater treatment“, says Dr Andreas Hauser, Director of Water Services at TÜV SÜD. The Omni Processor concept for example, might convert faecal sludge and possibly other solid organic wastes into beneficial outputs such as biomass for generating electricity, potable or drinking and non-potable water for irrigation or other purposes and ash without any negative impact on the environment.
Small Intestine Bacterial Overgrowth and Environmental Enteropathy in Bangladeshi Children. mBio, Jan 2016
Authors: Jeffrey R. Donowitz, Rashidul Haque, et al.
Recent studies suggest small intestine bacterial overgrowth (SIBO) is common among developing world children. SIBO’s pathogenesis and effect in the developing world are unclear. Our objective was to determine the prevalence of SIBO in Bangladeshi children and its association with malnutrition. Secondary objectives included determination of SIBO’s association with sanitation, diarrheal disease, and environmental enteropathy.
The strongest predictors of SIBO were decreased length-for-age Z score since birth (odds ratio [OR], 0.13; 95% confidence interval [CI], 0.03 to 0.60) and an open sewer outside the home (OR, 4.78; 95% CI, 1.06 to 21.62). Recent or frequent diarrheal disease did not predict SIBO. The markers of intestinal inflammation fecal Reg 1β (116.8 versus 65.6 µg/ml; P = 0.02) and fecal calprotectin (1,834.6 versus 766.7 µg/g; P = 0.004) were elevated in SIBO-positive children. Measures of intestinal permeability and systemic inflammation did not differ between the groups.
These findings suggest linear growth faltering and poor sanitation are associated with SIBO independently of recent or frequent diarrheal disease. SIBO is associated with intestinal inflammation but not increased permeability or systemic inflammation.
Q&A: Toilets confront climate change. Source: SciDev, Jan 5, 2015.
- Urban water shortages mean flushing toilets are poor option
- Off-grid toilets are resilient after disasters like flooding
- Households could hire rather than buy toilets
Two-and-a-half billion people worldwide have no access to safe, durable sanitation systems. Brian Arbogast, director of the water, sanitation and hygiene programme at the Bill & Melinda Gates Foundation, tells SciDev.Net how innovative toilet technologies and business models could help fix this — and help communities cope with the devastation of climate change.
How does climate change impact sanitation?
With sea levels rising, you have flooding that causes huge health problems. As latrines and septic tanks get flooded and waste goes into the streets and streams, it can carry a lot of disease, including cholera, dysentery and typhoid.
The problem is that the world has only one gold standard for sanitation, which is having flush toilets connected to sewer lines, that are further connected to big and expensive wastewater treatment plants. Growing cities that already have water shortages may not have enough water for everybody to bathe and cook, let alone to flush toilets. So, are these cities going to follow the same path we have taken for the last century in developed cities?
Spending on sewer systems and treatment plants would be as bad an idea as building a new coal power plant. You are committing to the next 50 years and if you are going to have an infrastructure that requires a lot of water and electricity, you are only making your city less resilient in the face of climate change.
Read the complete article.
Building towards a future in which urban sanitation “leaves no one behind,” 2015. Diana Mitlin, IIED.
Plans to improve access to sanitation in towns and cities of the global South are hampered by multiple challenges. One is a lack of reliable information. In particular, global and national-level data often diverge from data on particular settlements, collected by inhabitants of those settlements themselves. Local data highlight the inadequacy of living conditions – and in so doing evidence the difficulties in securing improvements. Another challenge lies in the setting of standards around acceptable sanitation. At a global level, for instance, shared sanitation is not considered part of “improved” sanitation. Yet the reality for many low-income urban populations is that communal sanitation can be hygienic, cost-effective and locally acceptable.
The difficulties in reaching a consensus around data and standards point to the importance of diverse approaches to increasing and improving sanitation, including considering both on-site and off-site solutions.
They also highlight how crucial it is for the planning and implementation of all such solutions to be inclusive of those often missing from global debates, such as the low-income urban groups that cannot afford substantial sanitation spending. Financial and political commitments, drawing on the circumstances and approaches articulated by low-income groups themselves, will be key to securing a future in which everyone has access to the sanitation they need.