污泥掺烧过程中Cl/S/P/矿物质的热交互作用对Cd迁移转化行为的影响  

Effects of the interactions of chlorine,sulfur,phosphorus and minerals during sewage sludge co-incineration on the migration and transformation of Cd

作　　者：刘敬勇[1] 黄李茂[1] 陈佳聪[1] 谢武明[1] 党晓娥[2] 郭家宏[1] 孙健[1] 张耿崚 孙水裕[1] 

机构地区：[1]广东工业大学环境科学与工程学院环境健康与污染控制研究院,广州510006 [2]西安建筑科技大学冶金工程学院(陕西省黄金与资源重点实验室),西安710055

出　　处：《环境科学学报》2016年第12期4407-4420,共14页Acta Scientiae Circumstantiae

基　　金：国家自然科学基金(No.51308132);广东省科技计划(No.2015B020235013;2014A050503063;2015A020215033);广州市科技计划项目(No.201510010033;2016201604030058);广东省高层次人才特殊支持计划(No.2014TQ01Z248)~~

摘　　要：采用化学热力学平衡分析方法,应用污泥实测数据模拟计算了污泥掺烧过程中Cl/S/P与矿物质的交互作用,重点模拟研究了Cl/S/P/矿物质交互体系对Cd迁移转化的影响.研究结果表明,污泥掺烧过程含Cl、S及P逸出气体以HCl(g)、SO_2(g)及(P_2O_5)_2(g)形式排放.污泥掺烧含有CaO-SiO_2-Al_2O_3体系中,CaO可以抑制S以SO_2(g)释放,而SiO_2及Al_2O_3对SO_2(g)逸出有促进作用,同时CaO及Al_2O_3可以抑制P的挥发.污泥掺烧过程中SiO_2及Al_2O_3对Cd挥发都有一定抑制作用,但CaO及Fe_2O_3对Cd基本无影响;当Cl存在时,Ti O2和SiO_2对Cd吸附作用减弱,并使Al_2O_3吸附剂失效;当S存在时,可导致吸附剂对Cd中毒,而P可导致Al_2O_3吸附剂失效;Cl-S-P耦合体系中,单一矿物质对Cd迁移转化影响主要受Cl和S控制.SiO_2+CaO+Al_2O_3共存体系中,Cl的存在可导致固体吸附剂SiO_2和Al_2O_3失效;S、S+Cl、S+P、S+Cl+P的存在受控元素为S,并且可以抑制Cd的挥发;P、Cl+P的存在对Cd影响受控元素为Cl,可促进Cd挥发.Thermodynamic equilibrium was calculated to reveal the partitioning of the conditioners and their emissions during sewage sludge incineration. Profiles of both composition of sewage sludge and various combustion conditions were applied in simulations. Effects of co-existence of FeC13 and CaO on the migration of heavy metals were also in considerations. Results show that elements of C1, S, and P emitted in the form of HC1 （g） and SO2（g） and （ P2O5 ） 2（g） during the mixed of sludge, respectively. CaO inhibited SO2 in the mixed system containing CaO-SiO2-A12O3. On the other hand, both SiO2 and A1203 additives can enhance the SO2（g） emission. At the same time, CaO and A12O3 controlled the P volatilization. In the process of the mixed, the volatility of Cd was inhibited by both SiO2 and A12O3, but CaO and Fe2O3. Thus, adsorption of Cd caused by both TiO2 and SiO2 decreased when CI existed, and the adsorption ability of A12O3. In S, adsorbents were poisoned by Cd, and then, preduced the adsorption ability of A1203. In the CI-S-P system, effect of a single mineral on Cd migration was mainly controlled by C1 and S. In the SiO2＋CaO＋A12O3 coexisted system, C1 disabled the adsorption efficiency of solid adsorbents such SiO2 and A12O3. Nevertheless, S dominated the reactions in the existence of S, S ＋ C1, S ＋P, S ＋ C1 ＋ P system, and it also restrain the volatilization of Cd. Besides, C1 promoted the volatilization of Cd in the existence of P and CI＋P environments.

关 键 词：污泥掺烧 氯（C1） 硫（S） 磷（P） 矿物质 镉（Cd） 热力学平衡分析 

分 类 号：X703[环境科学与工程—环境工程]