Effect of Green Oxidizing Agent on Inhibition of Escherichia coli Present in Livestock Wastes
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Effect of Green Oxidizing Agent on Inhibition of Escherichia coli Present in Livestock Wastes Angelika Więckol-Ryk Thomas
&
Barbara Białecka & Maciej
Received: 22 May 2020 / Accepted: 13 August 2020 # The Author(s) 2020
Abstract The optimisation tests of sodium percarbonate (biocide) with the formula 2Na2CO3·3H2O2, as a green oxidizing agent for biological deactivation of chicken manure, were carried out. The microbiological analysis of fresh manure which consisted of the enumeration of bacteria, fungi and eggs of intestinal parasites showed that the number of bacteria Enterobacteriaceae, i.e. 8.3 log10CFU/g, and the bacteria E. coli, i.e. 6.96 log10CFU/g, exceeded the required level in organic fertilizers. The Response Surface Methodology for three input parameters (biocide concentration, temperature and time) on the value of E. coli bacteria was applied. The obtained values of the coefficient of the multiple correlation R2 and the adjusted coefficient Radj2 were 0.90 and 0.75, respectively, which indicate a good fit of the data obtained with the model and the experimental data. It was concluded that a decrease in the count of the analysed microorganisms followed an increase in the sodium percarbonate concentration, an increase in the temperature and a longer time of contact of the manure sample
with the biocide. The content of bioavailable macronutrients (P, N, Ca, Mg, K) in water extracts of fresh chicken manure before and after its biological deactivation was determined with the ICP-OES method. The concentration of phosphorous in fresh manure extract was 310 mg/l and decreased after addition of one of the following agents: 7.5 wt.% of sodium percarbonate to 66.9 mg/l or 3.0 wt.% of traditional hygienizing agent, i.e. calcium hydroxide to 5.7 mg/l.. The results of the concentration of N in chicken manure with sodium percarbonate was also higher than in sample with calcium hydroxide, i.e. 1040.0 mg/l and 860.0 mg/l, respectively. While the addition of 2Na2CO3·3H2O2 decreased the content of Ca, Mg and K in fresh chicken manure.
A. Więckol-Ryk (*) Department of Risk Assessment and Industrial Safety, Central Mining Institute, Plac Gwarków 1, Katowice, Poland e-mail: [email protected]
Biowaste management is an important research issue aimed at both the economical utilization of livestock wastes as well as its effective use. In the last decade, all around the world, there has been observed a steady increase in poultry production. Poland is the European Union’s third largest producer of poultry meat and hen eggs. The data published in 2017 (Statistics Poland 2017) show that the vast majority of Polish poultry production are egg laying hens and broilers (92%); the rest are turkeys (5.6%), ducks (1.9%) and geese (0.5%).
B. Białecka Department of Environmental Monitoring, Central Mining Institute, Plac Gwarków 1, Katowice, Poland M. Thomas Chemiqua Water & Wastewater Company, Skawińska Street 25/1, Kraków, Poland
Keywords Chicken manure . Escherichia coli . Response Surface Methodology . Sodium percarbonate
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