Effect of aeration rates on the composting processes and Nitrogen loss during composting

Wemedo

2021

SAJRM

Biofertilizers are ecofriendly fertilizers that are produced via degradation of wastes by microorganisms. The efficiency of Lynsibacillus macroides and Alcaligens faecalis in the production of fertilizer from organic wastes was evaluated. The bacterial isolates were isolated from soil samples collected from fallow patch of land in the Rivers State University farm using standard microbiological methods. The test bacteria were identified by conventional and molecular techniques. Organic wastes including cassava peels, elephant grass and poultry droppings used in this study were collected from the Rivers State University Farm. Three experimental treatments were used in this study; treatment 1 contains 300g of the composite substrate without any organisms and served as control, treatment 2 contains 300g of the composite substrate and 200ml of Lynsibacillus macroides while treatment 3 contains 300g of the composite substrate and 200ml of Alcaligenes faecalis. The treatments were allowed to degrade for 10 days. The pH, temperature, nitrogen, phosphorus, potassium and total organic carbon were determined using standard analytical method. Means of physicochemical parameters in treatment 1, 2 and 3, respectively were: pH 8.3±0.7, 8.6±0.4 and 9.0±0.3; Nitrogen: 2.63±0.08, 1.97±0.03 and 1.51±0.01; phosphorus: 4.71±0.01, 4.43±0.01 and 3.52±0.02; potassium: 604.10±2.12, 591.00±1.41421 and 504.20±2.83; total organic carbon: 31.75±0.78, 23.04±0.04 and 17.56±0.01 mg/kg. The treatment which was supplemented with Lysinbacillus macroides produced more nitrogen, phosphorus, potassium and total organic carbon than treatment which was supplemented with A. faecalis. Statistical analysis showed that there was no significant difference (P≤ 0.05) between the quantity of nitrogen produced by L. macroides and A. faecalis. Although the amount of nitrogen produced by both organisms were significantly different from the control. More so, statistical analysis showed that the quantity of phosphorus, potassium and total organic carbon produced by L. macroides was significantly higher (P≤ 0.05) than those produced by A. faecalis and the control. Thus, Lynsibacillus macroides is a better biofertilizer producer than A. faecalis.

Section: Physicochemical Parameters Of Degraded Organic Wastesupporting

confidence: 91%

Section: Physicochemical Parameters Of Degraded Organic Wastementioning

confidence: 84%

Assessing the Nutrient Quality of Biofertilizer Produced from Organic Waste Using Lysinibacillus Macroides and Alcaligens Faecalis

Wemedo

2021

SAJRM

“…Variasi kecepatan aerasi yang digunakan adalah 0,2 L/menit/Kg, 0,05 L/menit/Kg, dan 0,1 L/menit/Kg. 3 Penelitian lain menunjukkan bahwa kontrol waktu aerasi meningkatkan proses komposting. Penelitian ini menggunakan kontrol waktu aerasi setiap 5 menit, jeda 15 menit dan dilakukan selama 3 hari.…”

Section: Peningkatanunclassified

Efektivitas Dan Kualitas Kompos Dengan Metode Self Turning Composter

Mulyati¹,

Hasan

2022

JRKPDB

Proses komposting adakalanya terkendala karena alasan gangguan estetika saat melakukan proses pencacahan maupun pembalikan sampah. Adanya bau yang mulai muncul karena proses pembusukan ataupun mulai bermunculannya organisme pengurai sampah lainnya. Self Turning Composter (STC) merupakan reaktor kompos bersusun 3 dengan dimensi reaktor 1 dan 2 = 40x40x30 cm, sedangkan reaktor 3 berupa pencacah sekaligus pembalik sampah. Self-Turning Composter ini terbuat dari bahan teak block dan plat baja sebagai alas setiap bagiannya. Self-Turning Composter ini akan mencampur sampah, memberinya oksigen, membalikkan sampah sekaligus mencacah sampah menjadi bagian yang lebih kecil. Peneliti bertujuan untuk mengetahui kualitas dan perbedaan efektifitas kompos menggunakan Self-Turning Composter dengan variasi pembalikan sampah. Penelitian ini menggunakan metode eksperimen dengan desain satu kelompok dengan hanya pengukuran pasca perlakuan (One group post-test-only design). Hasil penelitian menunjukkan bahwa pembalikan sampah sekali saja saat hari pertama komposting dan injeksi udara rutin setiap harinya diperoleh nilai rerata Seed Germination sebesar 85%. Pembalikan sampah setiap hari diperoleh nilai rerata Seed Germination sebesar 91,6%, sedangkan pembalikan 3 hari sekali diperoleh nilai rerata Seed Germination sebesar 85%. Nilai Seed Germination (SG) kompos dengan alat Self-Turning Composter pada semua perlakuan adalah > 80%, artinya kompos sudah matang dan tidak bersifat toksik %). Tidak ada perbedaan kualitas kompos untuk nilai Seed Germination dari berbagai frekuensi pembalikan dengan alat Self-Turning Composter Pembalikan kompos dengan alat Self-Turning Composter sekali saja saat pencacahan namun dilengkapi dengan aerated static pile adalah yang paling efektif karena waktu kompostingnya tercepat, menghasilkan nilai Seed Germination > 80%, dan nilai CN rasionya mendekati nilai ideal SNI kompos.

“… Keener et al (2001) concluded that aeration rates of 0.3 ~ 0.9 L/(min · kg organic matter) were required for agricultural wastes. For municipal waste, it is suggested that the aeration rate of 0.06 ~ 0.4 L/(min · kg organic matter) is more reasonable ( Xiong et al, 2017 ). A large number of studies have also shown that the required aeration rates were different for varied composting process conditions.…”

Section: Introductionmentioning

confidence: 99%

Effects of aeration modes and rates on nitrogen conversion and bacterial community in composting of dehydrated sludge and corn straw

Wang,

Xu,

Wang

et al. 2024

Front. Microbiol.

Aeration is an important factor to regulate composting efficiency and nitrogen loss. This study is aimed to compare the effects of different aeration modes (continuous and intermittent) and aeration rate on nitrogen conversion and bacterial community in composting from dehydrated sludge and corn straw. Results showed that the intermittent aeration mode at same aeration volume was superior to the continuous aeration mode in terms of NH3 emission reduction, nitrogen conversion and germination index (GI) improvement. Intermittent aeration mode with 1200 L/h (aeration 5 min, stop 15 min) [K5T15 (V1200)] and 300 L/h of continuous aeration helped to the conservation of nitrogen fractions and accelerate the composting process. However, it was most advantageous to use 150 L/h of continuous aeration to reduce NH3 emission and ensure the effective composting process. The aeration mode K5T15 (V1200) showed the fastest temperature rise, the longer duration of thermophilic stage and the highest GI (95%) in composting. The cumulative NH3 emission of intermittent aeration mode was higher than continuous aeration mode. The cumulative NH3 emission of V300 was 23.1% lower than that of K5T15 (V1200). The dominant phyla in dehydrated sludge and corn straw composting were Firmicutes, Proteobacteria, Actinobacteria, and Bacteroidetes. The dominant phylum in the thermophilic stage was Firmicutes (49.39%~63.13%), and the dominant genus was Thermobifida (18.62%~30.16%). The relative abundance of Firmicutes was greater in the intermittent aeration mode (63.13%) than that in the continuous aeration mode (57.62%), and Pseudomonas was dominant in composting with lower aeration rate and the lowest NH3 emission. This study suggested that adjustment to the aeration mode and rate could affect core bacteria to reduce the nitrogen loss and accelerate composting process.