Removal of soluble organic containments from dyeing biochemical effluent by SO32-/HSO5- system optimized
ZHANG Hao-nan1, TANG Hai1, LI Qiang1, ZHANG Chen1, LIU Gui-zhong2
1. School of Biochemical Engineering, Anhui Polytechnic University, Wuhu 241000, China;
2. Beijing Municipal Research Institute of Environmental Protection, Beijing 100083, China
The conventional biochemical treatment effluent of dyeing wastewater (BREDW) still contains a certain concentration of dissolved organic pollutants (DOM) and Aniline strictly controlled by the new standard. Sodium bisulfite-activated potassium bisulfate complex salt (SO32-/HSO5-) advanced oxidation system was used to produce sulfate radical (SO4-·) for the advanced treatment of BREDW. The effects of initial pH value, reaction temperature, SO32-/HSO5-molar ratio and HSO5- dosage on the removal of COD and aniline were optimized based on response surface methodology. COD and aniline can be removed by the system remarkably. The contribution order of influencing factors to COD and aniline treatment were as follows:temperature>n(SO32-)/n(HSO5-)>n(SO32-)>initial pH value and n(HSO5-)>n(SO32-)/n(HSO5-)/initial pH value>temperature. The removal rates of COD and aniline were 33% and 90% respectively under the experimental conditions by the experiment optimization:pH of 6.8, temperature of 53℃, concentration molar ratio SO32- to HSO5- of 1.6 and HSO5- dosage of 37.1mmol/L. Further studies were made on the changes of fluorescence and molecular properties of the main DOMs before and after dyeing effluent treatment. 3DEEMs found that aromatic proteins and soluble microbial metabolites were the main components of DOM in the BREDW. The fluorescent DOM content in the oxidized effluent decreased significantly under different conditions, and the fluorescent area volume was reduced by 42.03%~77.67%. At the same time, the peak value of tryptophan (Ex/Em=230~225nm/340nm~330nm) in the oxidized effluent was observed to blue shift of 5~10nm. Polycyclic aromatic hydrocarbons in BREDW are decomposed into small molecules, the number of conjugated groups and aromatic rings decreases; GPC revealed that the proportion of macromolecules (0.45μm~100kDa) was 41%, that of medium molecules (12~100kDa) was 48.9%, that of peak molecular weight (Mp) was 56.324kDa, and that of Mw/Mn=2.168. After treatment, the effluent Mp mainly distributes in the range of 12.28~17.56kDa, with more small molecular substances, more structures and species. GC-MS synchronously reveals that the alkanes in the oxidized effluent are greatly reduced, and the main by-products are esters, alcohols and fatty acids, which can create conditions for further biochemical treatment.
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