R.W. Adkinson

Prediction of effluent biochemical oxygen demand in a dairy plant SBR wastewater system

Abstract The effluent from a Sequencing Batch Reactor (SBR) that was used to treat waste water from a fluid milk processing plant was utilized in this study. After analyzing the waste water for biochemical oxygen demand (BOD), chemical oxygen demand (COD), total solids (TS), total suspended solids (TSS) and pH, a prediction equation for BOD was calculated. This prediction equation can be used for BOD at the 95% confidence interval in this particular waste water.

Evaluation of teat germicides of low iodine concentrations for prevention of bovine mastitis by Staphylococcus aureus and Streptococcus agalactiae

Abstract Two iodophor teat germicides of low iodine concentration were evaluated in a controlled, experimental challenge-infection study against Staphylococcus aureus and Streptococcus agalactiae . One germicide was a 0.1% iodophor containing 0.75% glycerin, formulated to maintain 5–6 ppm free I 2 . The other germicide was a 0.175% iodophor without emollient, formulated to maintain 4–6 ppm free I 2 . New intramammary infections with Staphylococcus aureus and Streptococcus agalactiae were reduced 80.7 and 56.6% by the 0.1% iodophor. The 0.175% iodophor gave a 65.0% reduction in new Staphylococcus aureus intramammary infections, but the new infection rate for Streptococcus agalactiae was low in both control and dipped quarters and provided limited power to detect differences between treatment groups. Reduction in new Streptococcus agalactiae infections was 33.3% for the 0.175% iodophor. No adverse effects on teat skin condition were observed.

Use of a three‐stage aerated lagoon system for disposal of dairy plant processing wastes 1

Abstract The disposal of dairy plant processing wastewater in a three‐stage aerated lagoon system was evaluated over a one‐year period. Aerators were fixed on the lagoon surfaces and designed to mechanically supply oxygen to the system. Monitored pollution parameters included flow‐rate, biochemical oxygen demand (BOD), chemical oxygen demand (COD), total suspended solids (TSS), total solids (TS), and pH. Microbiological parameters studied were heterotrophic plate count (HPC) and adenosine triphosphate (ATP) as measured by relative light units (RLU). The average daily effluent flow‐rate from the lagoon system was 163.3 x 103 L/d with 7 mg/L BOD5, 122 mg/L COD, 31 mg/L TSS, 652 mg/L TS, and 7.69 pH of effluent. An average BOD removal of 97% was achieved from the first lagoon sampling point to final pffluent, with 89% removal of COD, 93% removal of TSS, and 49% removal of TS. Overall, BOD was strongly correlated with the COD, TSS, TS, and pH. Also, COD showed a significant correlation with TSS and TS. Anothe...

Estimation of the biochemical oxygen demand from pollution parameters in a waste disposal system for dairy processing wastes 1

Abstract The estimation of biochemical oxygen demand (BOD) from other pollution parameters in a dairy plant processing wastewater was attempted. Monitored pollution parameters included biochemical oxygen demand (BOD), chemical oxygen demand (COD), total suspended solids (TSS), and total solids (TS). A prediction equation for BOD including COD, TSS, and TS can be used to estimate BOD concentrations at the 95° confidence interval in this aerated lagoon system.