Enhanced anaerobic digestion of piggery wastewater by ammonia stripping: effects of alkali types

Journal of Hazardous Materials
Lei Zhang, Deokjin Jahng

Abstract

Air stripping at alkaline pH was carried out to remove ammonia from the piggery wastewater, and its effects on subsequent anaerobic digestion were investigated in semi-continuous experiments. In ammonia stripping process, three alkalis (NaOH, KOH and CaO) were used for pH adjustment. When using NaOH and KOH, the methane production rate increased more than two folds as compared to the control (no ammonia stripped), but cation toxicity exerted by sodium and potassium ions was observed. When using lime, on the contrary, it was found that volumetric methane production rates (1040-1130 mL CH(4)/L day) and yields (262.3-258.9 mL CH(4)/g of COD(added)) were significantly higher than others. In addition, the organic removal efficiencies (54.2-59.5% of volatile solid, 59.6-64.0% of total COD, 72.1-81.9% of soluble COD and 89.3-98.9% of volatile fatty acid) were also high. Batch toxicity test results confirmed that cations of Na(+), K(+) were strong methanogenic inhibitors as compared to Ca(2+). From these observations, it was concluded that ammonia stripping at alkaline pH is important for anaerobic digestion of piggery wastewater and the alkali types should be chosen cautiously to avoid cation toxicity.

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Citations

May 10, 2012·Applied Microbiology and Biotechnology·Min-Kyu JiByong-Hun Jeon
Dec 2, 2011·Journal of Hazardous Materials·Lei ZhangDeokjin Jahng
Sep 10, 2015·Applied Microbiology and Biotechnology·Sho SuzukiKazuhide Kimbara
Apr 1, 2016·Journal of Environmental Management·Alice LimoliGianni Andreottola
May 7, 2013·Bioresource Technology·Qingfeng WangHaijia Su
May 2, 2015·Bioresource Technology·A Serna-MazaC J Banks
Oct 11, 2011·Bioresource Technology·M A SampaioI P Marques
Dec 26, 2012·Bioresource Technology·A J CavaleiroM M Alves
Dec 17, 2011·The Science of the Total Environment·Samantha AntoniniJoachim Clemens
Mar 20, 2020·Bioengineered·Shuqing ZhangShengyong Liu
Feb 14, 2017·Water Science and Technology : a Journal of the International Association on Water Pollution Research·Giorgos MarkouDimitris Georgakakis
Feb 7, 2017·Environmental Technology·Alba Serna-MazaCharles J Banks
Aug 10, 2017·Environmental Science and Pollution Research International·Harizah Bajunaid Hariz, Mohd Sobri Takriff
Mar 17, 2020·Environmental Science and Pollution Research International·Mohammad Javad Bardi, Hassan Aminirad
Jul 30, 2020·Journal of Environmental Management·Adele FolinoPaolo Salvatore Calabrò
Jul 29, 2021·Critical Reviews in Biotechnology·Rosina NkunaRasheed Adeleke

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