Application of rotary in-vessel composting and analytical hierarchy process for the selection of a suitable combination of flower waste

Abstract

The flower waste generated from different sources is either mixed with municipal solid waste or thrown into the river in India. Flower waste is rich in organic contents and can be converted into nutrient-enriched compost. The aim of the present study was to determine the changes in physico-chemical and biological changes during the composting of flower waste by using rotary drum technique. For composting the flower, waste was mixed with cow dung, sawdust, and wheat bran. Four different trials were performed, in which 0.5 wt% of sawdust and wheat bran was added in each trial. From the series of trials 1-4, the different proportions of flower waste and cow dung were 5:4, 6:3, 7:2 and 8:1, respectively. Finally, the compost produced by all the trials were found to have pH 7.23-7.51, electrical conductivity 5.5-6.12 mS/cm, reduction in the percentage of total organic carbon 22-33%, the percentage increase in total nitrogen 2.17-2.66%, C:N ratio 13-17, sodium 2.14-2.60 g/kg and calcium 13.35-15.58 g/kg. The analytical hierarchy process was used for the ranking of the trials to find the best proportions from the different combinations performed in this study.

Effect of particle size on rotary drum composting of garden waste and their ranking using analytical hierarchy process

“…where RI (random index) depends upon the size of the relative importance matrix (Here, RI= 1.35). As per (Sharma & Yadav, 2018b), the value of CR should be less than 0.1, which satis es the pairwise comparison matrix for criteria and validates the weights. In this case, CR = 0.092; which is CR < 0.1; which signi es that matrix is consistent and weights are valid.…”

“…Phosphorous is indispensable for plant growth and used by the microorganism for body metabolism during the composting process (Shi et al, 2013). Plants absorb phosphorous in soluble forms especially hydrogen phosphate ion (HPO 4 -2 ) (Sharma & Yadav, 2018b). The initial concentration of phosphorous in R1, R2, R3 and R4 were 1.53, 1.47, 1.74 and 1.68 g/kg which increased to 4.83, 5.02, 4.52 and 3.92 g/kg respectively after 45 days of composting period as shown in Fig.…”

“…AHP allows decision-makers to set their priorities and make the best selection of both tangible and intangible aspects (Md Zaini, Basri, Md Zain, & Saad, 2015). Sharma and Yadav, (2018a) used AHP for selection of best ratio of mix for composting of ower waste. Curiel-Esparza et al, (2014) used AHP for selection of a sustainable disinfection technique for wastewater reuse projects.…”

“…Analytical hierarchy process (AHP), a decision-making method has been widely used in various elds to solve multi-criterion selection problem (Sharma & Yadav, 2018a). AHP allows decision-makers to set their priorities and make the best selection of both tangible and intangible aspects (Md Zaini, Basri, Md Zain, & Saad, 2015).…”

Deformation mechanism of Area C landslide in Suijiang, Xiangjiaba Reservoir, Yunnan Province, China

“…While the Area GBP1 was moving, the cracks and boundary sedimentation were rather obvious to identify. Subsequently, the slipping plane of Area GBP1 moved to north steadily [30,31]. After the rainfall intensity of 2014 and 2015, the Area GBP1 showed greater displacement than the Area CP1 and Area LMG, with an increasing deformation of crack and boundary sedimentation [32].…”