Toxicity of Ozonated Animal Manure to the House Fly, Musca domestica

Abstract

Swine manure slurries were ozonated at a dosage of 1 g/L and tested for their toxicity to the house fly (Musca domestica). The observed toxicity of ozonated swine manure was consistent and independent of origin of the swine manure. A dose (dilution) response curve was performed. A 50% dilution in the ozonated swine manure slurry resulted in 90% reduction in toxicity. Neither the synthetic nor ozonated synthetic swine manure, both of which contained higher concentrations of formaldehyde and three other unidentified carbonyl compounds than the ozonated swine manure, were toxic to the flies. Ozonated swine manure slurry was centrifuged and passed through a 0.45-microm filter. The liquid phase was as toxic as the unfiltered slurry; as such, the toxicant appears to be present in liquid phase. Neither ammonia, hydrogen sulfide, formaldehyde, nor other simple aldehydes appeared to be the toxic agent. The toxic agent appears to be a polar chemical compound and is concentrated in the urine. Several possible compounds have been identified. The toxicity of untreated and ozonated manure slurries from different livestock was compared. Six animal manure slurries (beef and dairy cattle, horse, poultry, sheep, and swine) were ozonated (dosage of 1 g/L) and tested for toxicity to the house fly. Ozonated dairy cattle manure slurry showed 78% mortality after 72 h, whereas ozonated swine manure slurry achieved a 100% mortality rate in 48 h. Neither the unozonated dairy nor swine manure slurries, nor any of the other raw or ozonated manure slurries, were toxic to the flies.

Technologies to mitigate the environmental impact of broiler production

“…Nossos resultados indicaram que não existiram efeitos deletérios nas aves, houve uma redução na concentração de NH 3 entre 0 e 10 ppm, porém os efeitos benéficos em ganho de peso, conversão alimentar e mortalidade foram variáveis, e não foram observadas reduções significativas nas bactérias do ambiente. Outros pesquisadores (Masten et al, 2001) utilizaram O 3 para tratar cama de frangos e observaram redução significativa nas bactérias e também nas populações de moscas. Nosso grupo de pesquisa na Carolina do Norte avaliou o efeito de aplicação de O 3 em galpões de frangos nas populações de cascudinhos e não foram observadas diferenças significativas entre os galpões tratados e os dois do grupo controle.…”