The two-stage anaerobic treatment of molasses alcohol wastewater was carried out, nano zero valent iron (NZVI) was added to the first up-flow anaerobic sludge bed (UASB) reactor to reduce the inhibition of sulfide on anaerobic digestion process and improve the efficiency of two-stage anaerobic digestion system.The removal rate of chemical oxygen demand (COD) in the first reactor under different organic loading rates was higher than that without NZVI addition, the final removal rate was about 55%;the removal rate of sulfate was about 73%;the removal rate of COD in second reactor and the total removal rate were about 33% and 70%, respectively; the second reactor and total removal rates of sulfate were about 73% and 93%, respectively;the maximum sulfide concentration in the first and second stage anaerobic effluent was 363.9 and 452.4 mg/L, respectively.When the COD organic loading rate of the reactor reached 28 kg/(m3·d), the specific gravity of methane producing bacteria (MPB) and sulfate reducing bacteria (SRB) was about 86% and 14%, respectively.
ZHAO Mingxing
,
CHEN Yang
,
SHI Wansheng
,
MIAO Hengfeng
,
HUANG Zhenxing
,
RUAN Wenquan
. Effect of nano zero valent iron on treatment of molasses alcohol wastewater by a two-stage anaerobic digestion system[J]. Food and Fermentation Industries, 2020
, 46(21)
: 70
-74
.
DOI: 10.13995/j.cnki.11-1802/ts.025253
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