Banca de DEFESA: GIOVANA AGUIAR BATTISTI KROTH

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : GIOVANA AGUIAR BATTISTI KROTH
DATE: 07/08/2020
TIME: 13:00
LOCAL: Web Conferência via Google Meet - meet.google.com/nyg-tkmm-grj
TITLE:

Composting of laying poultry carcasses: assessment of degradation efficiency and stabilization by monitoring of physical-chemical and microbiological parameters.

KEY WORDS:

composting, laying hen, inoculante, grinded, agriculture waste.

PAGES: 45
BIG AREA: Ciências Agrárias
AREA: Medicina Veterinária
SUMMARY:

Even though composting is an extensively studied technique, several factors continue to hinder its efficiency and applicability. In addition, there are no in-depth and numerous studies with carcasses of laying hens, on a full scale, using different treatments. Thus, the objectives of this work were: To evaluate, in physico-chemical and microbiological terms, the efficiency of different composting conditions regarding the degradation and stabilization of carcasses of laying hens, considering even specific bacterial inoculation as potentially accelerating the process. 600 hens were used, 40 in each treatment containing whole carcasses (treatments 1 and 2, without and with bacterial inoculation, respectively) and 60 in treatments with grinded carcasses (treatments 3 and 4, with and without bacterial inoculation, respectively). Each treatment contained 115 kg of wet shavings (55%), and approximately 78 kg (T1 and T2) and 117 kg (T3 and T4) of carcasses. The initial C / N ratio was 11.56 for T1 and T2 and 9.85 for T3 and T4. The cells (masonry, 1 m3) were placed in a protected and covered environment. Temperature, conductivity, humidity, pH and microbiological activity (hydrolysis of fluorescein diacetate - FDA) were measured weekly. Monthly, several other parameters were evaluated, such as Coliforms Escherichia coli, Total Coliforms, Clostridium perfrigens and Salmonella spp., Chemical Demand (COD) and Biochemistry (BOD) of Oxygen, ash content and some nutrients. It was identified that the T3 and T4 treatments presented a higher decomposition rate than T1 and T2, considering the behavior of the temperature. All treatments cool about 0.5 ° C / day, according to data from temperature linearization in the first 40 days of the experiment. In the same period, T3 and T4 remained 5 ° C above T1 and T2, respectively. The temperature in T2, T3 and T4 matched to the ambient temperature about 10 days before T1, indicating greater stability of the final compound. Microbiological activity (MA) was increasing in all treatments, with brief differences between them and which can be related to BOD and temperature. Although the initial C / N ratio in T3 and T4 is less suitable for the composting process, the grinding of the carcasses enabled the stability of a greater number of carcasses in the same space and time, proving to be potentially advantageous, despite the need for greater infrastructure. At the end, the compounds were analyzed based on some parameters of Normative Instruction (IN) No. 27/2006, as amended by IN 7/2016 (ANNEX V) and IN 25/2006 of the Ministry of Agriculture, Livestock and Supply.

BANKING MEMBERS:
Externo à Instituição - CLAUDEMIR MARCOS RADETSKI
Presidente - 1836822 - CLEDER ALEXANDRE SOMENSI
Externo à Instituição - EVERTON LUIS KRABBE