Mitigating ammonia inhibition of thermophilic anaerobic treatment of digested piggery wastewater: Use of pH reduction, zeolite, biomass and humic acid

TLDR: The outcomes from these batch experiments support the use of pH reduction to 6.5 and zeolite treatment as effective strategies to mitigate ammonia inhibition of the thermophilic anaerobic treatment of piggery wastewater.

About: This article is published in Water Research.The article was published on 2012-09-15 and is currently open access. It has received 123 citations till now. The article focuses on the topics: PH reduction & Anaerobic digestion.

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Table 8. Thermodynamic comparison of various anaerobic microbial groups using hydrogen as electron donors

Table 1. Some key physico-chemical characteristics of raw and digested piggery wastewater

Table 5. Chemical composition of the digested piggery wastewater before (C1) and after (C2) pH reduction with and without piggery (pb) and DiCOM (db) biomass additions (% v/v) at the start and end of experiment (mean ± standard deviation)

Table 4. Chemical composition and methane production at various initial pH at the start and end of the experiment (mean ± standard deviation)

Table 6. Chemical composition of the pH-unadjusted (C1) and pH-reduced (C2) digested piggery wastewater before and after zeolite addition (mean ± standard deviation)

Table 7. Total COD and total VFA concentrations of the thermophilic piggery wastewater before and after humic acid treatment at the start and end of the experiment (mean data ± standard deviation)

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Q1. What are the contributions in this paper?

This study explored chemical and biological 11 means to mitigate ammonia inhibition on thermophilic anaerobic treatment of piggery 12 wastewater with the aim to increase organic volatile carbon reduction and methane 13 production. 5 further enhanced total VFA 22 reduction and methane production over their respective controls, with 20 g/L zeolite 23 * Manuscript