Photocatalytic Degradation of Molasses Alcohol Wastewater by Lead Tungstate
Molasses alcohol wastewater is produced by molasses fermentation in alcohol workshop of sugar refinery and high concentration and high chroma organic wastewater discharged later.
It riches in protein and other organic compounds, but also contains more N, P, K, Ca, Mg and other inorganic salts and higher concentrations of SO42- and so on, most of these acidic waste water, and high chroma, will seriously pollute the water, the environment, or cause compaction of soil acidification, crop long illness.
The main methods of treating molasses alcohol wastewater are irrigation, concentration, anaerobic and aerobic methods, biological products and EM bacteria technology, in addition to not producing biological products, other methods continue to harm the environment, or the cost is too high, unrealistic, will there be a feasible strategy for the best of both worlds?
In recent years, with the development of photocatalytic technology of nano tungstate, more and more tungstate chemicals have been used to purify environmental pollution, for example, some scholars have used lead tungstate as a photocatalyst to degrade molasses alcohol wastewater. How can the effect be?
Lead tungstate crystal is a new scintillation material because of its large density and good scintillation, generally used as a probe for electromagnetic calorimeters, the idea of being used as a photocatalyst is unique, but the effect is unexpectedly good.
According to a research report by Qin Zuzeng, a scholar at Guangxi University, PbWO4 can effectively catalyze the photocatalytic activity of molasses alcohol wastewater under UV irradiation, and the process is a first-order kinetic reaction. For 30 times diluted molasses alcohol wastewater, the addition of 4.0 g of L-PbWO4 photocatalyst was carried out by introducing 126 L h-1 air without changing the pH value of the waste water and without adding the co-oxidant H2O2, 120 min reaction at 300 W under the irradiation of high-pressure mercury lamp, the decoloration rate of PbWO4 photocatalytic degradation of molasses alcohol wastewater was 90.2%, the removal rate of COD was 78.6%, and good degradation was achieved.
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