Simultaneous treatment of fruit juice industry wastewater and single-cell protein synthesis using purple non-sulfur bacteria

被引:6
|
作者
Rashid, Naim [1 ]
Abdelnabi, Mirna N. A. [2 ]
Vincent, Annette Shoba [3 ]
Mackey, Hamish R. R. [1 ,2 ]
机构
[1] Hamad Bin Khalifa Univ, Qatar Fdn, Coll Sci & Engn, Div Sustainable Dev, Doha, Qatar
[2] Hamad Bin Khalifa Univ, Qatar Fdn, Coll Hlth & Life Sci, Doha, Qatar
[3] Carnegie Mellon Univ Qatar, Biol Sci Program, Ar Rayyan, Qatar
关键词
Fruit juice wastewater; Purple phototrophic bacteria (PPB); Carbon recovery; Photopigments; Anaerobic treatment; Aquaculture feed; COX-FREE HYDROGEN; PHOTOTROPHIC BACTERIA; RHODOPSEUDOMONAS-PALUSTRIS; BIOMASS; GROWTH; FEED; MICROALGAE; AERATION; RECOVERY; NITROGEN;
D O I
10.1007/s13399-022-03669-6
中图分类号
TE [石油、天然气工业]; TK [能源与动力工程];
学科分类号
0807 ; 0820 ;
摘要
Fruit juice industry wastewater is characterized by high chemical oxygen demand (COD) and low pH, which requires extensive energy if treated aerobically and can adversely affect aquatic organisms if discharged into water bodies without proper treatment. In this study, purple non-sulfur bacteria (PNSB) were employed to recover carbon through photoanaerobic treatment in the form of single-cell protein (SCP) suitable for aquaculture and rich in carotenoid and bacteriochlorophyll photopigments. The efficacy of PNSB was investigated using two types of wastewaters, citrus juice wastewater (CJW), and mixed juice wastewater (MJW) as substrates at different pH conditions (5.0-8.0). pH 8.0 showed the highest COD removal in CJW (89 +/- 0.1%) and pH 7.0 in MJW (94 +/- 1%), respectively. The biomass yields were 0.493 g-VSS.g-COD-1 and 0.397 g-VSS.g-COD-1 for CJW and MJW. SCP contents in CJW and MJW were 48 +/- 1% and 40 +/- 3%, respectively. Pigment analysis revealed that PNSB biomass contained carotenoids and bacteriochlorophyll. Carotenoids in CJW and MJW were 1354 +/- 64 mu g.g(-1) and 1558 +/- 218 mu g.g(-1) of biomass; bacteriochlorophyll contents were 2097 +/- 110 mu g.g(-1) and 3100 +/- 614 mu g.g(-1) of biomass, respectively. The microbial population showed diversity among the two substrates and pH conditions, with PNSB comprising potentially up to 51% of microbes in the culture. The results demonstrate that PNSB could be used as potential mediators to treat fruit juice wastewater, and produce SCP, and photopigments simultaneously.
引用
收藏
页码:16321 / 16332
页数:12
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