Disinfection of swine wastewater using chlorine, ultraviolet light and ozone

Abstract

Swine wastewater Chlorine Ultraviolet light Ozone A B S T R A C TVeterinary antibiotics are widely used at concentrated animal feeding operations (CAFOs) to prevent disease and promote growth of livestock. However, the majority of antibiotics are excreted from animals in urine, feces, and manure. Consequently, the lagoons used to store these wastes can act as reservoirs of antibiotics and antibiotic-resistant bacteria.There is currently no regulation or control of these systems to prevent the spread of these bacteria and their genes for antibiotic resistance into other environments. This study was conducted to determine the disinfection potential of chlorine, ultraviolet light and ozone against swine lagoon bacteria. Results indicate that a chlorine dose of 30 mg/L could achieve a 2.2-3.4 log bacteria reduction in lagoon samples. However, increasing the dose of chlorine did not significantly enhance the disinfection activity due to the presence of chlorine-resistant bacteria. The chlorine resistant bacteria were identified to be closely related to Bacillus subtilis and Bacillus licheniformis. A significant percentage of lagoon bacteria were not susceptible to the four selected antibiotics: chlortetracycline, lincomycin, sulfamethazine and tetracycline (TET). However, the presence of both chlorine and TET could inactivate all bacteria in one lagoon sample. The disinfection potential of UV irradiation and ozone was also examined. Ultraviolet light was an effective bacterial disinfectant, but was unlikely to be economically viable due to its high energy requirements. At an ozone dose of 100 mg/L, the bacteria inactivation efficiency could reach 3.3À3.9 log.

Antimicrobial Resistance Arising from Food-Animal Productions and Its Mitigation

“…Recognizing the potential risk, several research groups have investigated reduction of manure by tertiary treatments that have been used in municipal wastewater treatments. Macauley et al (Macauley et al, 2006) examined the effect of chlorine, ultraviolet light and ozone on swine lagoon bacteria. They found that these treatments at enough concentration or strengths dramatically decreased total bacteria present in swine lagoons, and a combination of chlorine and tetracycline killed all bacteria.…”

Single-step treatment of 2,4-dinitrotoluene via zero-valent metal reduction and chemical oxidation

“…Studies have also used UV/O 3 to treat a wide variety of wastewater contaminants including cyanide, swine wastes, quinoline, and landfill leachate (Ford et al, 2006;Macauley et al, 2006;Wang et al, 2004;Wu et al, 2004). UV/O 3 has also been used to remediate NACs.…”

Elimination of Antibiotic Multi-Resistant Salmonella Typhimurium from Swine Wastewater by Microalgae-Induced Antibacterial Mechanisms

“…Among them, Salmonella enterica serovar Typhimurium deserves special attention since it is the most prevalent antimicrobial resistant serovar in swines, and also frequently related to human infections and outbreaks [1]. Several physicochemical approaches are described to control the proliferation of pathogens, such as exposure to UV irradiation [2,3] use of strong oxidant radicals [2], pH increase [4], and selective membranes [5]. However, most if not all of these approaches are not economically feasible.…”