A kinetic study on how C/N ratio affects energy consumption of composting of rose oil‐processing wastes with caged layer manure and straw

Abstract

Composting process parameters such as C/N ratio, moisture content, and temperature are well studied, but limited knowledge exists on energy consumption of the process itself. In this study, co‐composting of rose oil‐processing wastes (ROPW) with caged layer manure and straw was performed to optimize the system in terms of energy use. Intermittent aeration applied to the five compost mixtures with initial C/N ratios of 12.81, 21.37, 24.66, 29.22, and 37.41 was conducted using fifteen identical cylindrical reactors with volume of 60 L. O2 and CO2 concentrations, compost temperature, dry matter loss, organic matter loss, electrical conductivity, and pH were measured. A first‐order kinetic model based on material mass balance was applied to determine kinetic parameters such as decomposition rate and compost equilibrium mass. An equation describing specific energy per initial dry mass of composting as a function of initial C/N ratio was presented and used to optimize initial C/N ratio to maximize composting of ROPW to reach a given level of compost mass ratio. The maximum decomposition, based on dry matter loss, occurred at the initial C/N ratio of 30.18 was 0.032 kg kg−1 day−1. Initial C/N ratio to minimize specific energy use of ROPW composting with caged layer to reach a given level of compost ratio of 0.82 was 29.11. Composting operation can be performed at this initial C/N ratio (29.11) to minimize airflow to keep the power requirement low while still operating the system efficiently. This helps to reduce the energy required for ROPW composting with caged layer to reach a given compost mass ratio. © 2016 American Institute of Chemical Engineers Environ Prog, 36: 129–137, 2017

Effect of Electrolysis on Activated Sludge during the Hydrolysis and Acidogenesis Stages in the Anaerobic Digestion of Poultry Manure

“…A case study by Onursal et al (2021) [18] determined that quail manure has a relatively high biogas potential. As a result of a separate study, the cumulative biogas and methane production of quail manure was higher than cow and rose oil processing waste.…”

Havalandırma Oranı ve Başlangıç Karbon/Azot Oranının Alkaloid İşleme Katı Atıklarının Tavuk Gübresi İle Kompostlamasında Enerji Tüketimine Etkisi

“…Sıcaklık, nem içeriği, başlangıç karbon/azot oranı vb. parametrelerin kompostlama işlemine etkisi hakkında yeterli miktarda literatür bulunmasına rağmen, bu parametrelerin kompostlama işleminde enerji tüketimine etkisi konusunda sınırlı sayıda çalışma bulunmaktadır (Onursal ve Ekinci, 2017) , 2000). En düşük seviyede Ec/KK değerleri, havalandırma debisinin Qmin=2 m 3 h -1 olduğu uygulamadan elde edilmiştir (Şekil 3d ve Çizelge 4).…”

Effect of Initial Carbon to Nitrogen Ratio on the Degradation of Oil Palm Empty Fruit Bunch with Periodic Addition of Anaerobic Palm Oil Mill Effluent Sludge

“…Composting is a proven method to mitigate greenhouse gases emission by stabilising agricultural solid waste, landscape waste and food waste, which will otherwise be converted into methane and CO 2 (Kumar et al, 2010). Composting is a process of degradation of organic waste into a stable organic matter with the dynamic interactions among the physical, chemical and biological factors (Białobrzewski et al, 2015;Onursal & Ekinci, 2016). Thermophilic conditions generated during the process is a reflection of the biological heat of microbial growth and activity.…”