Author(s)

Amad H. A. Gani, Farisse J. Chirindja, António G. J. Dias & António A. R. Monjane

Abstract

The objective of this work is to evaluate the amount of CH₄, CO₂ and SO₂ that is currently emitted by the Hulene dump into the atmosphere. The work consisted in measuring these three gases using an S360 multigasometer that simultaneously measures eight gases. Measurements were made in April, May, June, July, August and September, which are considered the dry season in Maputo city. Measurements were made at 18 points of gas release pipes installed by the Municipality of Maputo. Point P10, presents the highest value of 2.56 and 2.59 (% vol of CH₄), respectively in the months of April and May. Point P14 had the highest value of 2.95 (% vol of CH₄) in April and 2.28 (% vol of CH₄) in May. Point P15 presented values of 2.78 and 2.72 (% vol of CH₄), respectively in the months of August and September.
Points P10, P14 and P15 showed higher values of CH4 in April, May, August and September. Points P9 to P13 showed marked variations of CO₂ in the months of July, August and September. Point P10 presented the highest value of 2.56 and 2.59 (ppm of CO₂), respectively in the months of April and May. Point P14 showed the highest value of 2.95 (ppm CO₂) in April and 2.28 (ppm CO₂) in May. Point P15 presented the highest value of 5,000 ppm of CO₂ in August and September. In April, points P1 to P6 showed values above 100 ppm of SO₂ and dropped drastically from point P7 to 3 ppm of SO₂. In April, P6 reached 137 ppm of SO₂. In August and September, the values gradually increased, reaching 178 ppm of SO₂ at point P18.

Keywords

biogas, emission, greenhouse effect