Compost quality of a peri-urban waste composting facility: A case of Mukono municipality, Uganda

Figures & data

Figure 1. Categories of wastes generated in the study area (Modified from Omara et al., 2019).

Figure 2. Map of Uganda showing study area of Mukono municipality.

Figure 3. (a) Compost raw materials in windrow bays. (b) Pre-sorted waste composition. (c) Compost raw materials composition and sorting. (d) Mature compost.

Table 1. Compost quality analytical results (mean values)

Parameter	Dry season	Wet season	Compost quality common range*	US 1584:2017**
pH	9.1	9.0	7–8	6–10
Temperature (°C)	46.7	46.1	45–50°C	-
Moisture content (%)	46	47.4	<60%	30–35%
Organic matter (%)	21.6	23.0	32–43%	-
Total nitrogen (%)	0.8	1.0	.7–1.5%	1
Total phosphorus (%)	0.5	0.5	.3–.6%	-
Potassium (%)	0.3	0.5	.2–.5%	-
Lead (mg/kg)	0.03	0.02	0.1 mg/l	100 (mg/kg)
Cadmium (mg/kg)	0.01	0.01	0.1 mg/l	5 (mg/kg)
Copper (mg/kg)	0.4	0.5	1.0 mg/l	300 (mg/kg)
Arsenic (mg/kg)	BDL^†	BDL^†	0.2mg/l	10 (mg/kg)

* Sullivan et al. (2003); †Below detectable levels; ** UNBS Standard; US 1584:2017 Organic fertilizer—Specification.

Table 2. Compost quality results summary statistics

	Dry season	Wet season
Mean	12.54	12.80
Variance	363.76	371.61
Standard error	6.031	6.09
Standard deviation	19.07	19.27
Skewness	1.34	1.31
Confidence level	13.64	13.79
Pooled variance	367.69	-
df	18	-
t stat	−0.030	-
t Critical two-tail	2.10	-

Omara, T., Othieno, N., Obonge, J., Ssebulime, S., & Kansiime, M. (2019). Characterization and prognostication of wastes generated by industries in Kampala industrial and business park—namanve. Open Access Library Journal, 6(3), 1–15. https://doi.org/10.4236/oalib.1105189

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Sullivan, D. M., Bary, A. I., Nartea, T. J., Myrhe, E. A., Cogger, C. G., & Fransen, S. C. (2003). Nitrogen availability seven years after a high-rate food waste compost application. Compost Science and Utilization, 11(3), 265–275. https://doi.org/10.1080/1065657X.2003.10702133

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Data availability statement

All data concerning this work has been availed within the article