Compost phases

The prepared mix is put into a tunnel in a static aerated pile, where a 16 day active composting phase takes place. The compostable bag fragments, separated during the screening and mash separation steps, start their degradation here. Part of the process water from the AD is added to keep the moisture constant and to evaporate part of the excess water from AD. 

Bertoldi and Civilini (2006) carried out a composting process in two separate reactors first, only in the thermophilic phase, with the purpose of pathogen destruction and decomposition by selected thermophilic microorganisms second, only in the mesophilic phase, to perform the main microbial transformations with a higher... 

Sharma et al. (2005) developed robust calibrations for some of the key parameters from the spectra or fresh phase I and II composts and found by the laboratory measurement that for phase I samples were greater than those of the phase II samples except for ash, due to a higher degree of heterogeneity in the substrate. 

Biodegradable products are designed for applications where the functional property of biodegradability is a sustainable feature and is of value to the customer. The products show their potential at the end-of-use phase. The preferred end-of-life option for biodegradable products made of Ecoflex is composting. To make sure... 

Waste gas is first drawn in through the air/water separator, used to remove impurities in the air such as water droplets, solid particles, etc. The effluent then travels to the trickling filter, which is a packed column of very porous polymer material. The use of a polymer as the packing material enhances mass transfers between the liquid and gas. The polymer can fix a large culmre of specific bacteria capable of degrading contaminants found in the liquid phase. The trickling filter is followed by a compost-based biofilter that removes residual contaminants. 

The developer claims that one advantage of composting is that it is more effective than other solid-phase treatment systems for soils and slndges contaminated with viscons snbstances snch as coal tar, creosote, or petroleum production facility slndges and still bottoms. 

A methanotrophic biofilter is a biofilter in which methanotrophs are present. In a biofilter, a gas- or aqueous-phase contaminant stream is passed through a media on which the bacteria are growing. The media can be of several different materials, including compost, peat, soil material, or granular activated carbon. Specific strains of bacteria may be introduced into the filter and optimal conditions provided to preferentially degrade specific compounds. 

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