Track topics on Twitter Track topics that are important to you
Wastewater treatment is an important source of methane (CH) emissions. In most large-size aerobic treatment plants, the excess sludge is digested in anaerobic reactors (AD), with the concomitant CH emissions. The guidelines of the Intergovernmental Panel on Climate Change (IPCC) have been adopted worldwide for quantifying the national emission inventories, which include wastewater treatment plants (WWTP) as a key category. The IPCC recommends using default emission factors (Tier 1) for countries with limited available data (such as Mexico and most developing countries). However, these estimates have a high degree of uncertainty, owing to the lack of reliable information about the operation process and local environmental conditions. In order to reduce uncertainty in the estimation of CH emission from WWTP in Mexico, a country-specific emission factor was determined for AD associated with activated sludge process. This was accomplished with on-site data obtained from the AD of six activated sludge WWTP. In addition, the measured CH emissions were compared to those resulting from the application of the IPCC Tier 1 method, using the recommended default methane correction factor (
0.8) as well as alternate values (0.32 and 0.26) recently proposed by the authors. Results show that the IPCC Tier 1 method, using the recommended MCF, highly overestimate CH emissions compared with the values obtained on-site. In contrast, the alternate MCF achieved better estimations than the IPCC-recommended MCF, much closer to the observed emission values. The CH emission factor proposed as country (Mexico) specific value is 0.49 kg CH/kg BOD, which would allow the application of IPCC Tier 2 method. By doing so, the uncertainty associated with CH emission from aerobic treatment plants with AD would be reduced. This, in turn, would provide important information for implementing appropriate CH mitigation strategies for the water sector.
This article was published in the following journal.
Name: The Science of the total environment
Wastewater treatment (WWT) may be an important source of methane (CH), a greenhouse gas with significant global warming potential. Sources of CH emissions from WWT facilities can be found in the water...
Free nitrous acid (FNA) pre-treatment has been previously demonstrated to be effective in enhancing methane production and volatile solids (VS) destruction in the anaerobic digestion of waste activate...
Previous studies reported that free ammonia (FA) pretreatment could improve methane production from anaerobic digestion of waste activated sludge (WAS) effectively. However, details of how FA pretreat...
Methane oxidation coupled with denitrification is an effective way to reduce the discharge of nitrate and methane. The anaerobic sludge from a laboratory wastewater treatment facility, anaerobic sludg...
Development of digesters with an external zeolite column facilitates the convenient removal of the zeolite with TAN, without disturbing the continuous anaerobic digestion process. A digester with an i...
Irritable bowel syndrome (IBS) is a gastrointestinal (GI) syndrome characterized by chronic abdominal pain and altered bowel habits in the absence of any organic cause. The symptoms of IBS...
Hearing loss is one of the most common congenital anomalies . It has been shown to be greater than that of most other diseases and syndromes (eg, phenylketonuria, sickle cell disease) scre...
This will be a retrospective cohort study comparing women obtaining an abortion in New Mexico and living in Texas and women obtaining an abortion in New Mexico and living in New Mexico .
A Randomized, Double-Blind, Parallel-Group, Placebo-Controlled, Multi-Dose Study of the Effect of Two Dosage Strengths of SYN-010 Compared with Placebo on Breath Methane Production in Brea...
In this study the investigators aim to compare the efficacy of neomycin to a combination of rifaximin and neomycin in the treatment of C-IBS subjects with methane on their breath test. Thi...
A family of anaerobic METHANOSARCINALES whose cells are mesophilic or thermophilic and appear as irregular spheroid bodies or sheathed rods. These methanogens are found in any anaerobic environment including aquatic sediments, anaerobic sewage digesters and gastrointestinal tracts. There are four genera: METHANOSARCINA, Methanolobus, Methanothrix, and Methanococcoides.
The sole genus in the family Methanospirillaceae whose organisms are progressively motile by means of polar, tufted flagella. They have been isolated from sewage-sludge and pear waste digesters as well as marine and non-marine habitats.
A family of gram-negative, asporogenous rods or ovoid cells, aerobic or facultative anaerobic chemoorganotrophs. They are commonly isolated from SOIL, activated sludge, or marine environments.
A group of methane-based halogenated hydrocarbons containing one or more fluorine and chlorine atoms.
A family of anaerobic METHANOCOCCALES whose organisms are thermophilic methanogens that produce methane from hydrogen and simple carbon sources such as carbon dioxide.