通过光催化氧化提高吡啶的可生化性
首发时间:2010-12-29
摘要:难以生物降解的吡啶经过光催化氧化之后,其结构发生变化,由不能被重铬酸钾氧化变为可以被氧化,表现为其COD随着光催化氧化而升高。将吡啶作为有机碳源进行反硝化实验,结果表明,吡啶经过光催化氧化之后,相比未经过光催化氧化的吡啶,可使硝酸盐的去除率提高3.2倍。将经过30min光催化氧化的吡啶作为有机碳源进行3h的反硝化,硝酸盐的去除率相当于加入150mg/L的葡萄糖的效果。说明光催化氧化后吡啶的可生化性明显提高,同时还可实现吡啶和硝酸盐同步去除的效果。
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Improved biodegradability of pyridine by means of photocatalysis
Abstract:Pyridine, one of bio-recalcitrant compounds, was treated with photocatalysis to cause destruction of its molecular structure. It could not be oxidized by potassium dichromate until photocatalysis, which was proved by COD increasing with photocatalytic time increasing. Pyridine was taken as organic carbon source to reduce nitrate in denitrification, and experimental results indicated that nitrate removal percentage with photocatalysis was increased as 4.2 times as that without photocatalysis. When pyridine was treated with photocatalysis and used as organic carbon source for denitrification of 30 min, the nitrate removal percentage was equivalent to the same effect by adding 150 mg/L of glucose as carbon source, which suggested that biodegradability of pyridine was improved after photocatalysis, which could realize pyridine and nitrate removal at the same time.
Keywords: pyridine, denitrification, organic carbon source, photocatalysis, nitrate nitrogen
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No.4399734369838129****
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