Design of waste stabilization ponds for dairy processing plants in Uganda

Waste stabilization ponds (WSP) were designed to treat 287.5 m3 day-1 of wastewater generated from processing of 100 m3 of milk per day.  The design involved use of existing models including those developed by Mara to size the anaerobic, facultative and maturation ponds.  The design temperature was 250C.  The anaerobic pond was designed based on volumetric organic loading rate while facultative pond was designed based on surface loading rate.  On the other hand, the maturation pond was designed based on the number of coliform bacteria removed per 100 mL of wastewater.  The anaerobic pond was designed to remove 70% BOD, facultative pond-75% and maturation pond-25% BOD.  In addition, the maturation pond was designed to have a coliform bacteria removal efficiency of at least 99%.  The total land requirement for anaerobic pond was estimated at 945.19 m2, facultative pond-6361.54 m2 and three maturation ponds-2709.06 m2.  To cater for pond operation and maintenance, an additional 25% land was incorporated resulting into 1.25 hectares as the total land area required for pond construction, operation and maintenance.  Besides treatment of wastewater to reduce BOD, remove pathogens and other pollutants, the use of WSP can result into high economic benefits through recycling of wastewater for agriculture and aquaculture. As a result, the payback period for the investment cost may also be shortened.   Keywords: milk, waste stabilization ponds, BOD, anaerobic, facultative, maturatio

Training report: capacity building in entrepreneurial and business skills for operationalizing fresh cassava roots packhouse.

This report describes the capacity building process and activities that were done to enhance the business and entrepreneurial skills of packhouse operators

Technical report: Postharvest Physiological Deterioration (PPD) tolerance of selected Ugandan cassava varieties. Extending the shelf-life of fresh cassava roots for increased incomes and postharvest losses reduction

The purpose of this study is to screen cassava varieties for their level of tolerance or susceptibility to Postharvest Physiological Deterioration (PPD). Specifically, it aims at collecting varieties of fresh cassava roots preferred by consumers in Ugandan. The study targets the two major fresh cassava supply axes, i.e., Masindi/Kiryandongo and Kyenjojo/Kabarole. Fresh cassava roots were screened for tolerance or susceptibility to PPD. The study also aims at determining the effect of pruning on the deterioration of cassava roots over time and the changes in root biochemistry during storage of both pruned and non-pruned cassava varieties

Manual: setting up a packhouse for waxing and relative humidity storage of fresh cassava roots

European UnionPeer Revie

Adaptability and phenotypic stability of resistance to two viral diseases and yields traits in Cassava

Cassava productivity is hampered by pests and diseases including cassava mosaic disease (CMD) and cassava brown streak disease (CBSD). The main objective of this study was to identify stable superior genotypes that combine disease re-sistance and high yield. Sixteen cassava genotypes were planted in a randomized complete block design with three replications for six planting seasons (years) at five sites in Tanzania. The genotypes were assessed using the additive main effect and multiplicative interaction (AMMI) analysis, and highly significant

Effectiveness of pruning and waxing in reducing postharvest physiological deterioration in Uganda local cassava varieties.

Cassava ( Manihot esculenta Crantz) roots in the fresh form, are susceptible to postharvest physiological deterioration (PPD), thus reducing their economic value and farmer benefits. The objective of this study was to evaluate the effectiveness of pruning and waxing on fresh root storability among cassava varieties in Uganda. Sixteen cassava plants per variety (TME 14, NASE 14, Nyaraboke, Kirimumpale, and Bukalasa) were pruned seven days before harvest, leaving the rest as unpruned controls. After harvest, roots were divided into two portions and one portion was waxed using food grade wax. Pruning alone reduced PPD of stored roots by 23% at day 14 of storage; and by 19% at day 28 compared with the control. Pruning as a treatment resulted into increased sugar content, ranging 9-30%), and significant (P<0.05) losses in starch yield. Pruning combined with waxing, resulted in a reduction of up to 43% in PPD by day 14, and up to 67 at day 28. Reduction in carbohydrate (starch) was not significant (P>0.05) under the pruning and waxing treatment, which had minor effects on stored root composition. The results indicate that pruning is appropriate for the short-term storage of fresh cassava roots for up to 14 days. Waxing, combined with pruning, is suitable for longer term storage up to 28 days under Uganda conditions.Les racines de manioc ( Manihot esculenta Crantz) \ue0 l\u2019\ue9tat frais sont sensibles \ue0 la d\ue9t\ue9rioration physiologique apr\ue8s la r\ue9colte, r\ue9duisant ainsi leur valeur \ue9conomique et les avantages pour les agriculteurs. L\u2019objectif de cette \ue9tude \ue9tait d\u2019\ue9valuer l\u2019efficacit\ue9 d\u2018 \ue9laguer et de cirer sur la capacit\ue9 de stockage des racines fra\ueeches parmi les vari\ue9t\ue9s de manioc en Ouganda. Seize plants de manioc par vari\ue9t\ue9 (TME 14, NASE 14, Nyaraboke, Kirimumpale et Bukalasa) ont \ue9t\ue9 \ue9lagu\ue9s sept jours avant la r\ue9colte, les autres \ue9tant des t\ue9moins non \ue9lagu\ue9s. Apr\ue8s la r\ue9colte, les racines ont \ue9t\ue9 divis\ue9es en deux parties et une partie a \ue9t\ue9 cir\ue9e avec de la cire de qualit\ue9 alimentaire. L\u2019\ue9lagage seul r\ue9duisait la PPD des racines stock\ue9es de 23% au 14e jour de stockage; et de 19% au 28e jour compar\ue9 au t\ue9moin. L\u2019\ue9lagage en tant que traitement a entra\ueen\ue9 une augmentation de la teneur en sucre (comprise entre 9 et 30%) et une perte significative (P <0,05) du rendement en amidon. La combinaison d\u2018 \ue9laguer et de cirer a entra\ueen\ue9 une r\ue9duction de la PPD de 43% au 14e jour et de 67 ans au 28e jour. La r\ue9duction de la teneur en glucides (amidon) n\u2019\ue9tait pas significative (P> 0,05) dans le cadre des traitements d\u2018 \ue9laguer et de cirer a eu des effets mineurs sur la composition des racines stock\ue9es. Les r\ue9sultats indiquent que l\u2018\ue9laguage convient au stockage \ue0 court terme de racines de manioc fra\ueeches pendant 14 jours au maximum. La combinaison d\u2018 \ue9laguer et de cirer convient au stockage \ue0 long terme jusqu\u2019\ue0 28 jours dans les conditions ougandaises