藻细胞内外有机物氯消毒后典型消毒副产物的生成潜能

The formation potential of halogenated DBPs of intracellular and extracellular organic components of chlorella during chlorination

摘要:

为探究藻细胞内外有机物氯化后典型消毒副产物的生成潜能,选取小球藻为研究对象,采用加氯消毒法研究了在不同生长时期及不同氯投加量下典型含碳类消毒副产物(THMs)和含氮类卤代消毒副产物(TCNM)的生成规律,并对二者的生成势进行了对比.结果表明：细胞外有机物(EOM)和细胞内有机物（IOM）提取液的总有机碳（TOC）和有机氮（DON）较高,而芳香结构和不饱和双键的有机质质量浓度很低；从对数生长期到衰亡期,EOM经氯化后TCNM的生成量逐渐增加,IOM的TCNM生成量则呈现先增加后降低的趋势；THMs的生成规律与TCNM相似,但其生成量明显高于TCNM.增加氯投量,EOM的TCNM生成量逐渐升高,IOM的TCNM 生成量则先升高后下降；在氯投量为30 mg/L时,IOM的TCNM生成量最高；稳定生长期小球藻细胞的EOM和IOM在氯投量由20 mg/L升高到30 mg/L时,THMs的生成量稳定增加,当氯投量超过30 mg/L时,THMs的生成势显著升高,且三氯甲烷为THMs的主导物种.

Abstract:

This work was to investigate the formation potential of trihalomethane(THM) and trichloronitromethane (TCNM) for algae extracellular organic matter (EOM) and intracellular organic matter (IOM) in different algae growth stages and chlorine dosages, and the effects on the production of THMs and TCNM during chlorination were further studied. Results showed that EOM and IOM had high concentrations of TOC and DON, while low organic component of aromatic structure and unsaturated double bonds. The yields of TCNM from chlorinated EOM increased from high biomass logarithmic phase to declinephase.However, TCNM of IOM followed an increasing and then decreasing pattern with the extent of growth days. The pattern of THMsFP was similar to TCNMFP, but the concentrations of THMs were much higher than TCNM. TCNM increased with chlorine dosages during EOM chlorinated, for IOM, however, the concentration of TCNM firstly increased and then decreased. The maximum TCNM yield of IOM appeared on chlorine dosage of 30 mg/L.TCM was the dominant fraction of THMs. In stationary phase, THMs produced from EOM and IOM gradually increased with chlorine dosage from 20 to 30 mg/L, but increased significantly at more than 30 mg/L.