煤系废弃物对磷的吸附及解吸特性

Phosphate adsorption and desorption characteristics in different coal wastes medium

粉煤灰、煤矸石及其不同的配比对磷的吸附与解吸特性不同.研究结果表明:煤矸石(M)、粉煤灰(F)、粉煤灰与煤矸石等体积混合(FM)、粉煤灰与煤矸石体积比10∶1混合(FM10)以及土壤(S)对磷的吸附量均随磷浓度增加而增加,但其吸附率随浓度增加而减少.Langm iur方程能较好地拟合废弃物对磷的吸附规律,不同基质的最大缓冲容量大小顺序:FM>M>FM10>F>S.4种废弃物对磷的解吸率与最大缓冲容量的顺序恰恰相反,废弃物对磷的解吸能力远低于土壤.表明废弃物与土壤相比磷的生物有效性较低,对废弃物改良需要综合考虑其pH和其它生物措施,促进废弃物的资源化利用.

Showed the characteristics of phosphate adsorption and desorption with different medium such as fly ash （F）, coal wastes （M）, fly ash mixed coal waste as 1：1 （V/V） （FM） , fly ash mixed coal waste as 10：1 （V/ V） （FM10） and soil （S）. The phosphate adsorption capacity increased with adding P concentration, however the adsorption rate decreased. The Langmiur equation is fit for the adsorption characteristics. The maximum buffer capacity of the medium showes different adsorption ability, such as FM 〉 M 〉 FM10 〉 F 〉 S. The P desorption capacity of the wastes is lower than that of the soil. It demonstrates the wastes with low P bioavailability. The wastes amendment should consider the medium pH and other biological ways to oromote the wastes utilizalion effectively.