Digestión aerobia discontinua de SANDACH procedentes de granjas de ponedorasinfluencia de los ciclos de aireación

Résumé

About 95% of laying hens farms are exploited intensively in cages, creating a lot of products not intended for human consumption (SANDACH). The storage and disposal of these byproducts must be borne by the farmer, producing a high added cost and potential biosecurity problems. One possible solution is the on-farm composting of these products through a closed discontinuous digester. The rate of aeration is one of the most important operating parameters within the composting considering that it affects microbial activity, rate of substrate degradation, temperature variation and gas emission. The aim of this paper is to study how they evolve gas emissions and other monitoring parameters in the process of co-composting chicken manure and chicken carcasses in a closed discontinuous digester with different aeration cycles. The compost mixture consisted of chicken carcasses (CG), chicken manure (GZ) and straw (PJ) with a mixing ratio of 1/1-1, 2/0, 1 respectively. Aeration was performed forced by a fan that introduces air through a flow of 600 m3 / h for 5 minutes at. We studied 4 different aeration cycles every 48, 24, 18 and 12 hours. To evaluate gas emissions we used a gas meter which provides multiple data series as: % Vol CO2, CH4% vol, number of H2S. The analyzed Tracking parameters analyzed throughout the process were: temperature, pH, conductivity, salinity and C and N content. In the 4 experiences the ammonia concentration was above 200 ppm, higher measurement range. This indicates that there is a high biological activity. In the experience with an aeration cycle of 48 hours are given higher CH4 content which indicates a higher anaerobic condition. After an initial decrease the ratio C / N is again increased due to loss of N. Experience with aeration every 48 hours was the greatest final ratio presented for with an 11.5. The data obtained in the different experiences indicate that aeration cycles effectively influence the composting process and within these cycles which gave the best answer were the 5 minutes to every 12 to 24 hours.