Biosolids Thesis About

Biosolids Thesis About-56
NH-N was not the main inhibitory constituent and other organics in APL, including 3,5-dimethoxy-4-hydroxybenzaldehyde, 2,5-dimethoxybenzyl alcohol, benzene, cresol, ethylbenzene, phenols, styrene, and xylenes as well as nitrogenated organics (e.g., benzonitrile, pyridine) ostensibly caused considerable methane production inhibition.

NH-N was not the main inhibitory constituent and other organics in APL, including 3,5-dimethoxy-4-hydroxybenzaldehyde, 2,5-dimethoxybenzyl alcohol, benzene, cresol, ethylbenzene, phenols, styrene, and xylenes as well as nitrogenated organics (e.g., benzonitrile, pyridine) ostensibly caused considerable methane production inhibition.

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The Hornsby Bend Biosolids Management Plant (HBBMP) in Austin, TX is used as a case study.

First, the operation of the plant without any modification was modeled and validated with field data.

Both non-catalyzed and catalyzed APLs were produced at 800°C from a mix of digested primary and raw waste activated sludge from a municipal water resource reclamation facility.

Using the anaerobic toxicity assay, APL digester loading rates higher than 0.5 g COD/L for non-catalyzed and 0.10 g COD/L for catalyzed APL were not sustainable due to toxicity.

Py-gas is a relatively clean-burning product containing hydrogen (H) and other constituents that can be combusted alone or mixed with anaerobic digester biogas in boilers, engines, and other equipment for renewable energy (Domínguez et al., 2006; Mc Namara et al., 2016).

Pyrolysis liquid is a light- to dark-brown material consisting of a complex mixture containing hundreds of organic compounds (Huber et al., 2006).

-N are known to inhibit methane-producing microbes.

Autocatalytic pyrolysis which uses previously-produced biochar as a catalyst during biosolids pyrolysis, increases energy-rich py-gas while eliminating bio-oil production and reducing COD concentration in the APL (catalyzed APL).

However, there are health and environmental concerns related to these approaches due to pathogens, micropollutants, and excess nutrients in the environment as well as a desire for energy and resource recovery from wastewater solids (Bridle and Skrypski-Mantele, 2004; Tsai et al., 2009; Hamidi et al., 2017; Khazaei et al., 2017, 2018).

Therefore, technologies that destroy pathogens and micropollutants while generating energy, such as thermochemical processes, are being investigated.

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