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Speciation transformation of arsenic during municipal sewage sludge incineration with cotton stalk as additive

机译：以棉秆为添加剂的城市污水污泥焚烧中砷的形态转化

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The fly ash from municipal sewage sludge (MSS) incineration contains abundant phosphorus and can be used as phosphate fertilizer. However, fly ash also contains arsenic that is extremely poisonous to the environment. The toxicity of arsenic significantly depends on its speciation: As(III) is much more toxic than As(V). Addition of cotton stalk (CS) was proposed to promote the speciation transformation of arsenic to the less harmful As(V) during MSS incineration. In this work, the speciation transformation of arsenic during the co-firing of MSS and CS in a fluidized bed was studied, and the fate of arsenic during flue gas cooling process was also investigated. The results indicate that the chemical oxidation of arsenic vapors (As2O3(g)) is greatly stimulated by the co-firing of MSS and CS especially at 40-50% CS. Mineral compounds such as Ca, Fe, and Al compounds in CS can provide chemical adsorption sites for arsenic to facilitate the chemical oxidation of arsenic by forming various arsenates (As(V)) during MSS incineration. Additionally, the oxidation of arsenic is continuously conducted during flue gas cooling at 320-610 degrees C. The arsenic toxicity in the fly ash sampled downstream the flue gas was significantly reduced by addition of 40% CS into MSS during incineration. (C) 2017 Elsevier Ltd. All rights reserved.
机译：市政污水污泥（MSS）焚烧产生的粉煤灰中磷含量丰富，可用作磷肥。但是，粉煤灰还含有对环境极有毒的砷。砷的毒性很大程度上取决于其形态：As（III）的毒性比As（V）高得多。有人建议添加棉秆（CS），以促进MSS焚烧过程中砷向有害性较低的As（V）的形态转化。本文研究了流化床中MSS和CS共烧过程中砷的形态转化，并研究了烟气冷却过程中砷的去向。结果表明，MSS和CS的共烧特别是在40-50％CS的条件下大大促进了砷蒸气（As2O3（g））的化学氧化。 CS中的矿物化合物（例如Ca，Fe和Al化合物）可以为砷提供化学吸附位点，从而通过MSS焚烧过程中形成各种砷酸盐（As（V））促进砷的化学氧化。另外，在烟气在320-610℃冷却期间，砷的氧化连续进行。通过在焚烧过程中向MSS中添加40％CS，烟气下游采样的粉煤灰中的砷毒性显着降低。 （C）2017 Elsevier Ltd.保留所有权利。

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