Velizarov Svetlozar, Crespo João G, Reis Maria A
Department of Chemistry-CQFB, Faculdade de Ciências e Tecnologia, Universidade Nova de Lisboa, P-2829-516 Caparica, Portugal.
Biotechnol Prog. 2002 Mar-Apr;18(2):296-302. doi: 10.1021/bp010160u.
An ion exchange membrane bioreactor (IEMB), consisting of a monoanion permselective membrane dialyzer coupled to a stirred anoxic vessel with an enriched mixed denitrifying culture, has been studied for nitrate removal from drinking water. The influence of nitrate and chloride concentrations on the selectivity of nitrate transport in the IEMB process was investigated. With appropriate dosing of chloride ions to the IEMB biocompartment, it was possible to regulate the net bicarbonate flux in the system, thus maintaining the bicarbonate concentration in the treated water at the desired level. The latter was not possible to achieve in Donnan dialysis, operated as a single process in which, besides the lower nitrate removal efficiency found, bicarbonate was co-extracted together with nitrate from the polluted water stream. Residual carbon source (ethanol) and nitrite were not detected in the treated water produced in the IEMB system. With a concentration of nitrate in the polluted water three times higher than the maximum contaminant level of 50 mg L(-1) allowed, the IEMB process was successfully operated for a period of 1 month before exceeding this limit.
一种离子交换膜生物反应器（IEMB），由一个单阴离子选择透过性膜透析器与一个装有富集混合反硝化培养物的搅拌缺氧容器相连组成，已被用于研究从饮用水中去除硝酸盐。研究了硝酸盐和氯化物浓度对IEMB过程中硝酸盐传输选择性的影响。通过向IEMB生物隔室适当投加氯离子，可以调节系统中的净碳酸氢盐通量，从而将处理后水中的碳酸氢盐浓度维持在所需水平。在唐南透析中，作为一个单一过程运行时，这是不可能实现的，在唐南透析中，除了发现的较低的硝酸盐去除效率外，碳酸氢盐还与硝酸盐一起从污染水流中被共提取出来。在IEMB系统产生的处理后水中未检测到残留碳源（乙醇）和亚硝酸盐。当污染水中硝酸盐浓度比允许的最大污染物水平50 mg L(-1)高三倍时，IEMB过程在超过该限值之前成功运行了1个月。
