Kigali — With the aim of environmental conservation, an energy consultant, John Munyansanga, has introduced an improved institutional cooking stoves in over 10 schools in the Bugesera district, Eastern Province.

In an interview with The New Times, Munyansanga explained that the new stove saves up to 55 percent of firewood fuel compared to the common cooking method that saves only 39 percent.

“We design this stove in a way that all the energy produced in the wood inlet is concentrated on the cooking pot.”

“The oven also has a system that collects all the smoke from within and lets it out via a chimney – a method that promotes good health for the users as they will not inhale the bad smoke anymore,” he said.

Citing hospitals, schools, prisons and other institutions that use a lot of firewood for energy, Munyansanga highlighted that with the introduction of such a system, less trees will be cut down and more money can be saved as well.

“During our various installations, we noticed that under the traditional method, 28.9kgs of firewood were used to cook 20kgs of beans and with the new stove, 13.1kgs are used for the same,” he added.

A representative of Mayange (B) Primary School also noted that with the introduction of the stoves, the school is set to save on purchasing firewood, a measure which will enable them utilize the money for other developmental matters.

“This is a great initiative that not only enables us to save money but it has also made cooking easier and faster. Our kitchen staff does not have any problems with the smoke,” Innocent Nkusi said as he smiled.

The Safe Environment Conservation Management Programme is being introduced in various schools by the United Nations Development Programme (UNDP) through the Millennium Villages project.

Officials said that installation of one stove costs about Rwf1.2 million however materials required to set up the ovens will soon be manufactured locally in a bid to lower construction costs.

Source – http://allafrica.com/stories/200908250123.html

A. Chaurey, T.C. Kandpal,

Solar lanterns for domestic lighting in India: Viability of central charging station model, IN: Energy Policy, In Press, Corrected Proof, Available online 4 July 2009, ISSN 0301-4215, DOI: 10.1016/j.enpol.2009.06.047.

About 68 million households in India rely on kerosene as a fuel for domestic lighting. Kerosene-based lighting devices, not only for poor quality of light, but also for the risks of indoor air pollution and fire hazards, etc. are not a desired option for domestic lighting purposes. Solar lantern is a better alternative in terms of its quality of illumination, durability and versatility of use. The dissemination model for solar lantern in India has so far been based on cash sales with or without the incentive of capital subsidy. This paper analyses several dissemination models including rental and fee-for-service based on centralized solar charging station concept for CFL- and LED-based designs of solar lanterns available in India. The basis of comparison is the acceptable daily costs or rental to the user as well as to the owner of the charging station. Further, the paper studies the impact of likely escalation in kerosene price on the acceptable daily rental and estimates the amount of subsidy required to make the charging station model viable for disseminating solar lanterns among rural households.

Tingting Feng, Shengkui Cheng, Qingwen Min, Wei Li,

Productive use of bioenergy for rural household in ecological fragile area, Panam County, Tibet in China: The case of the residential biogas model, IN: Renewable and Sustainable Energy Reviews, Volume 13, Issue 8, October 2009, Pages 2070-2078, ISSN 1364-0321, DOI: 10.1016/j.rser.2009.02.001.
(http://www.sciencedirect.com/science/article/B6VMY-4VP4WYY-5/2/911d064bc8005c7ed401244fe9b9256b)

Bioenergy is the major domestic energy for rural households in developing countries due to its cheap or easy-getting characteristics. Productive use of bioenergy is an important strategy for rural households to improve not only their income, but also their health, living environment and so on. In Tibet of China, which is rich in cattle dung and firewood as the major energy sources for rural households, the efficiency of energy utilization is just about 10%. In order to improve energy utilization efficiency and the living conditions for rural residents, the Tibet Autonomous Region government introduced residential biogas model (RBM) to local households, which was a comprehensive utilization system of energy integrated with residential biogas digester, vegetable greenhouse and livestock shed. This paper aims to show the productive use of the bioenergy by the RBM, which could be depicted as the feasibility and the benefits on economic, eco-environmental and social aspects of biogas utilization, based on household questionnaires in Panam County. In RBM, biogas digester works as the biomass material supplement loop to transform originally biomass flow from single-direction to recycling-direction. The results indicate that the output of unit biogas digester could replace 1.44 t of firewood, 1.65 t of agricultural residues and 1.75 t of cattle dung, respectively. The net incremental benefit of RBM could reach 5550.72 Yuan in 15 years. The reduced amount of CO2 emission when substituted by biogas in other agricultural areas and the areas of semi-agricultural and semi-husbandry in Tibet could be (76.66-79.89) x 104 t/year and the capability for nitrogen storage could achieve (0.39-0.99) x 104 t/year. The amount of cattle dung replaced by biogas could reach 78.29 x 104 t/year; this means that the saved cattle dung, 3.51 t/hm2, could be reallocated back to cultivated land to improve the soil fertility and to keep the balance of nutrient elements in cultivated land. Biogas utilization reduces the labor opportunity costs of women compared to use of traditional bioenergy sources. It could be concluded that the productive use of bioenergy through RBM in this area has its capability to release the current pressures on biomass sources by adjusting patterns of rural energy consumption, and to improve the conditions of health, environment, economy and energy conservation.

D. Massey, J. Masih, A. Kulshrestha, M. Habil, A. Taneja,

Indoor/outdoor relationship of fine particles less than 2.5 [mu]m (PM2.5) in residential homes locations in central Indian region, IN: Building and Environment, Volume 44, Issue 10, October 2009, Pages 2037-2045, ISSN 0360-1323, DOI: 10.1016/j.buildenv.2009.02.010.
(http://www.sciencedirect.com/science/article/B6V23-4VPM5B9-1/2/542d64792e36d920cf18b90bab07b808)

The high levels in developing countries and the apparent scale of its impact on the global burden of disease underline the importance of particulate as an environmental health risk and the consequence need for monitoring them particularly in indoor microenvironment. PM2.5 [mu]m, 1.0 [mu]m, 0.5 [mu]m and 0.25 [mu]m were measured inside and outside 14 residential homes located in different microenvironment during a six-month period (October 2007-March 2008) in Agra located in the central region of India. Particulate mass concentrations were measured using Grimm aerosol spectrometer for 24 h inside and outside the homes located in roadside, rural and urban area, along with the field survey study done in the same region. The indoor average concentrations recorded for PM2.5, PM1.0, PM0.5 and PM0.25 were maximum for the rural homes (173.03 [mu]gm-3, 133.26 [mu]gm-3, 96.02 [mu]gm-3, 8.56 [mu]gm-3) followed by roadside homes (137.93 [mu]gm-3, 117.09 [mu]gm-3, 68.17 [mu]gm-3, 8.55 [mu]gm-3) and then by urban homes (135.55 [mu]gm-3, 102.92 [mu]gm-3, 38.38 [mu]gm-3, 6.35 [mu]gm-3). The average I/O ratios for PM2.5, PM1.0, PM0.5 and PM0.25 in roadside and rural areas were close to or above 1.00 and less than 1.00 for urban areas. The I/O ratios obtained were linked to the indoor activities using occupant’s diary entries. The positive values of correlation coefficient (r) also indicated the indoor concentrations of particulate matter were correlated with the corresponding outdoor concentrations.
Keywords: Particulate matter; Indoor-outdoor relationship; Indoor air; Indoor air pollution

Mahmodul Hasan, Abdus Salam, A.M. Shafiqul Alam,

Identification and characterization of trace metals in black solid materials deposited from biomass burning at the cooking stoves in Bangladesh, IN: Biomass and Bioenergy, In Press, Corrected Proof, Available online 12 June 2009, ISSN 0961-9534, DOI: 10.1016/j.biombioe.2009.05.023.
(http://www.sciencedirect.com/science/article/B6V22-4WH6KH8-4/2/76a51eb00946f0afedd4c3d9be7f5fe5)

In this study we have reported the emissions of trace metals from biomass burning at the cooking stoves. Black solid materials deposited from two different types of biomass (rice husk coils – type 1; mixed (straw, bamboo, cow dung, leaves and plants) biomasses – type 2) burning at the cooking stoves were collected from the top of the stoves (but inside the roof of the kitchen) in Narsingdi, Dhaka, Bangladesh. Systematic chemical analysis was done for both samples. Lead, mercury, iron and calcium were identified in sample type-1, and lead, iron and magnesium were identified in sample type-2. The concentration of the trace element was determined with an atomic absorption spectrophotometer. The average concentrations of lead, iron, cadmium calcium, potassium and magnesium were 95.6, 11520, 8.33, 1635, 17.1 and 443.1 mg kg-1, respectively in sample type-1. The average concentration of lead, iron, cadmium calcium, potassium and magnesium were 125.2, 12360, 12.0, 1648, 21.5 and 534.2 mg kg-1, respectively in sample type-2. However, the average concentrations of the determined trace elements followed the sequences, Fe > Ca > Mg > Pb > K > Cd. The emission of lead, iron, cadmium, calcium, potassium and magnesium were much higher from mixed biomass (type-2) compared than the rich husk coils (type-1). The mixed biomass produced about 31% higher lead, 44% higher cadmium, 26% higher potassium, and 21% higher magnesium compared than the rice husk coils. This is the first systematic analysis for the trace metal emissions from different types of biomass burning at the cooking stoves in Bangladesh.

Kristin Aunan, Terje K. Berntsen, Gunnar Myhre, Kristin Rypdal, David G. Streets, Jung-Hun Woo, Kirk R. Smith,

Radiative forcing from household fuel burning in Asia, IN: Atmospheric Environment, Available online 5 August 2009, ISSN 1352-2310,(http://www.sciencedirect.com/science/article/B6VH3-4WXSK5G-1/2/4434bb9837d75457e1a220b5e1c05eaa)

Household fuel use in developing countries is a major source of carbonaceous aerosols and other air pollutants affecting climate. Using a state-of-the-art emission inventory, a global three-dimensional photochemical tracer/transport model of the troposphere, and a global radiative transfer model, we estimate the radiative forcing (RF) attributable to household fuel combustion in Asia in terms of current global annual-mean RF and future global integrated RF for a one-year pulse of emissions (2000) over two time horizons (100 and 20 years). Despite the significant emissions of black carbon (BC) aerosols, our estimates indicate that short-lived (non-Kyoto) air pollutants from household fuel use in the region overall may exert a small net negative RF because of the strong influence of reflective aerosols. There are, however, major uncertainties in emission estimates for solid fuel burning in household stoves. Moreover, the sustainability of fuel wood harvesting in Asia (the carbon neutrality of harvesting) is largely unknown. Due to these uncertainties we find that the sign of the RF from household biomass burning in the region cannot be established. We discuss the implications of our modeling exercise in context of the discussion on whether the number of radiatively active species in future treaties should be expanded beyond those specified in the Kyoto Protocol. While recognizing the need for integrating climate change and air pollution policies, we are concerned that for a `Kyoto style’ post-Kyoto treaty (with global cap-and-trade and the Global Warming Potential as the metric) expanding the basket of components with a selection of short-lived species without also including the wider range of co-emitted species may lead to unintended consequences for global-scale climate.

‘Illegal’ paraffin stoves a safety risk
Thousands of “illegally imported” paraffin stoves are flooding the South African market, crippling the local metal industry and posing health risks in poorer communities.

The Paraffin Safety Association of South Africa (Pasasa) told the Weekend Argus that it has been visiting stores to assess the availability of legal paraffin appliances and discovered that out of the 141 stores visited, only one in 14 was selling legal appliances.

According to Pasasa there is an “influx of unapproved and hazardous” paraffin appliances, apparently making their way from China to South African ports.

“These dangerous stoves are being sold to underprivileged communities all over the country. They are mostly found in local Indian and Chinese shops,” said Patrick Kulati, head of the association.

A South African stove manufacturing company, which is approved by the SABS, described the issue as a “hard blow” to the industry.

A senior manager, who asked not to be named or have the company named because she feared harassment from the illegal operators, said: “We continue to lose more money daily due to the illegal sale of the goods. Nowadays we sell less than we did previously.”

The manufacturer said it struggled to compete with the illegal market and that “there are just too many of the cheap products for us to compete with”.

The manager said the company was the only recognised stove manufacturer in the country.

She said they had been forced to retrench nearly 300 people in the last five years because the profit fall had been “massive”. She blamed the unsafe imports

“Now a lot of people are unemployed because no money is coming in to continue operations, consumers are opting for the cheaper lot,” she said.

The National Regulator for Compulsory Specifications (NRCS) said it was confiscating thousands of unapproved stoves daily across the country.

“Our inspectors have managed to seize quite a large number of stoves and none of them have the safety features required,” said Thomas Madzivhe, NRCS senior manager.

In May this year, a Chinese shop owner and three others were arrested after the regulator seized 8 000 “non-compliant” stoves and heaters in the shop in Cape Town. The stoves violated a set of safety standards which state that the manufacturing, sale and use of environmentally friendly stoves should pose no health risk to the consumer.

The unapproved stoves are the ones being snapped up by people who want to save money, Pasasa said.

The association added the goods were exact counterfeits of the harmful ones previously made by the local company until the National Regulator presented a new set of safety standards.

The illegal importers “saw a gap in the market and decided to make the most of it and now the whole country is at huge risk”.

“People in many communities are attempting to evade financial troubles and are seeking cheaper alternatives and unfortunately they are not always safe. The influx (of illegal stoves) has made matters worse.

“The effects have already been felt by most people. Fires mostly take place due to the use of these duds and because people are unaware of their hazardous nature they purchase them,” said Kulati.

He added his organisation had discovered the importers’ tactics. “They put on road shows in rural and township areas and sell their faulty goods to the people. They do this because there would be no paper trail for police to nab them.”

It is alleged the appliances are smuggled into the country at habours in PE and Durban.

Customs officials are told that the goods are to be sent to neighbouring countries, but they are then dropped in South Africa.

But the National Regulator said although it did make inspections at ports countrywide, it could not confirm this, but would continue inspections.

And Pasasa said there were plans by the National Regulator to approach the Chinese and Indian embassies to try and work out a solution to the problem.

Source – http://www.internafrica.org/2009/08/illegal-paraffin-stoves-safety-risk.html

Cancer Epidemiol Biomarkers Prev. 2009 Aug 18.

Aryl Hydrocarbon Receptor Expression Is Associated with a Family History of Upper Gastrointestinal Tract Cancer in a High-Risk Population Exposed to Aromatic Hydrocarbons.

Roth MJ, Wei WQ, Baer J, Abnet CC, Wang GQ, Sternberg LR, Warner AC, Johnson LL, Lu N, Giffen CA, Dawsey SM, Qiao YL, Cherry J.

1Nutritional Epidemiology Branch, Division of Cancer Epidemiology and Genetics, National Cancer Institute; 2National Center for Complementary and Alternative Medicine, National Institutes of Health, Bethesda, Maryland; Departments of 3Cancer Epidemiology, 4Endoscopy, and 5Pathology, Cancer Institute, Chinese Academy of Medical Sciences, Beijing, People’s Republic of China; 6Laboratory of Molecular Technology and 7Pathology and Histotechnology Laboratory, Science Applications International Corporation-Frederick, Inc., National Cancer Institute-Frederick, Frederick, Maryland; and 8Information Management Services, Silver Spring, Maryland.

BACKGROUND: Polycyclic aromatic hydrocarbon (PAH) exposure is a risk factor for esophageal squamous cell carcinoma, and PAHs are ligands of the aryl hydrocarbon receptor (AhR). This study measured the expression of AhR and related genes in frozen esophageal cell samples from patients exposed to different levels of indoor air pollution, who did or did not have high-grade squamous dysplasia and who did or did not have a family history of upper gastrointestinal tract (UGI) cancer.

METHODS: 147 samples were evaluated, including 23 (16%) from patients with high-grade dysplasia and 48 (33%) from patients without dysplasia who heated their homes with coal, without a chimney (a “high” indoor air pollution group), and 27 (18%) from patients with high-grade dysplasia and 49 (33%) from patients without dysplasia who did not heat their homes at all (a “low” indoor air pollution group). Sixty-four (44%) had a family history of UGI cancer. RNA was extracted and quantitative PCR analysis was done.

RESULTS: AhR gene expression was detectable in 85 (58%) of the samples and was >9-fold higher in those with a family history of UGI cancer [median expression (interquartile range), -1,964 (-18,000, -610) versus -18,000 (-18,000, -1036); P = 0.02, Wilcoxon rank-sum test]. Heating status, dysplasia category, age, gender, and smoking were not associated with AhR expression (linear regression; all P values >/= 0.1).

CONCLUSION: AhR expression was higher in patients with a family history of UGI cancer. Such individuals may be more susceptible to the deleterious effects of PAH exposure, including PAH-induced cancer. (Cancer Epidemiol Biomarkers Prev 2009;18(9):OF1-6).

WEDNESDAY, Aug. 19, 2009 (Health.com) — A soak in a steamy tub, surrounded by candles, sure seems like a great way to unwind. But new research suggests that burning certain kinds of candles may generate indoor air pollutants.

Researchers at South Carolina State University studied petroleum-based and vegetable-source candles to determine their emissions. They let candles from different manufacturers burn for up to six hours in a small box (8” x 8” x 26”), and then collected and analyzed substances released into the air.

They found that paraffin-based candles—the most popular kind—emitted toxic chemicals like toluene and benzene. Soybean candles did not, according to the study, which is scheduled to be presented this week at the American Chemical Society meeting in Washington, D.C. Candles made of beeswax or soybean tend to make mention of that ingredient on their label; paraffin candles may not.

The researchers say that lighting a paraffin candle once in a while is unlikely to pose a health threat. However, frequently lighting many candles in an unventilated space could lead to problems, and may aggravate asthma, cause allergy-like symptoms, or irritate the respiratory tract.

However, whether some candles are safer than others is still debatable, according to one expert. “I think there’s some controversy out there as to which candles are better than others,” says George Thurston, PhD, an associate professor of environmental medicine at the New York University School of Medicine.

Read More – http://news.health.com/2009/08/19/candles-may-pollute-air

uganda-jiloSaving energy, money all at once

It is exactly one month since government marked the Energy Efficiency Week under the theme: “You Can Save Energy: Save it Now and Save Money.”

The events were intended to educate the public on the significance of energy conservation. But a month after the event, do Ugandans have anything to show they benefited from the week-long celebrations?

For Joyce Kahumura, the current high power tariffs coupled with increasing domestic power demand is enough to cause power users to adopt energy saving techniques. “From the time Umeme increased power tariffs, life has been challenging,” Kahumura, in her early 30s says.

“I had to abandon the use of some of my cooking electrical appliances and resorted to using Jikos (locally made charcoal stoves) to reduce my power bills. They had become too high for me.” She says the clay-made Jikos are energy conservers and are environmentally clean. She has a number of Jikos of different sizes, which help her cooking at home.

Kahumura buys the charcoal stoves from traders in Mbale and one of the businessmen who spoke to Smart Money, Benson Wanjala, says with increased adoption of the stoves as a means of countering the high electricity rates; their business is trooping towards success.

“We formed a group in 2004 and started making the stoves under a shade,” the leader of the five-man group says. “The capital was limited and we did everything manually. But as people started buying the stoves we got money and bought a machine that helps us in mixing the clay and in curing the stoves.”

An improved stove that uses 50 per cent of the charcoal used by the ordinary stove. Using more efficient energy sources could save you money and protect the environment as well.

Mr Wanjala says the group makes about fifty stoves a day and they sell at Shs1000 each. He says the low product price is discouraging members to continue with the business because of the limited returns. He however, insists they would expand it and maximise sales.

Mr Nelson Orama, the head of a youth association that makes kilns (local cooking ovens) for schools and is based in Jinja says improved stoves are the way to go given the current high power charges. “They (improved stoves) are very economical when it comes to energy consumption,” the Makerere University Information Communications Technology degree holder says.

According to Mr Orama, the stoves are advantageous because they use less charcoal compared to metallic stoves and thus economise money spent on charcoal. They are also safe to use since they are insulated and are less likely to cause burns besides cooking fast as they retain heat in the metallic lining.

A recent statement from the Ministry of Energy said that, improved stoves are cost-effective given that they reduce heat loss by more than 50 percent. “It makes a lot of economic sense to buy an improved cooking-stove which saves about 50 per cent of the charcoal used by the ordinary stove,” the statement reads in part. “This stove is able to save energy because it is well insulated with a ceramic lining.”

The five-page document says a consumer using a metallic stove would need twice the amount of charcoal to power it compared to the improved model.

Read More – Daily Monitor