[Microbial characteristics and eco-health implication of mineral spring water in Wudalianchi, Northeast China]. / äº”å¤§è¿žæ± çŸ¿æ³‰æ°´çš„å¾®ç”Ÿç‰©ç‰¹å¾å’Œç”Ÿæ€å¥åº·æ•ˆåº”.

Mineral spring water is a top quality potable groundwater resource formed by long-term groundwater-rock interaction in aquifer. Mineral spring water is rich in minerals and trace elements which are beneficial for human health. Given the current serious water pollution and environment deterioration, it is of great significance to re-recognize the ecological and health effects of mineral water based on new scientific and technological achievement. The Wudalianchi scenic area in Heilongjiang Province has abundant mineral water and peloid resources, which supported the development of tourism and convalescence and have been used in medical and health care for more than 100 years. However, it is threatened by resource reduction, environmental pollution, and other problems. Here, we reviewed the formation process, distribution, hydro-biochemical characteristics and health effects of the Wudalianchi mineral springs, with particular focus on the advances of microbial studies in this area. We also proposed the future research prospective for the Wudalianchi mineral water. To better protect and utilize the Wudalianchi mineral water, it was recommended that a green eco-agriculture practice in reducing chemical fertilizers should be adapted in the surrounding farms of Wudalianchi. Along with the development of tourism and recuperation resources, it is necessary to establish a framework of pollution risk assessment and control, and strictly reduce potential emerging pollutants to eco-geological environment.

Low-temperature biodegradation of aniline by freely suspended and magnetic modified Pseudomonas migulae AN-1.

Aniline is of great environmental concern with regards to widespread occurrence in water and soil and increasing threat into the life forms. Bioremediation involving the use of degrading bacterium in the removal of aniline is the most promising process, yet inhibited under low temperature usually. In the present study, a new psychrotrophic bacterial strain isolated from groundwater, designated AN-1, was shown to be capable of aniline degradation in a concentration range of 135-2202 mg L(-1) within 72 h at 10 °C. Strain AN-1 was proposed to be a Pseudomonas migulae group of bacteria based on the evolutionary relationship and the morphological and biochemical characteristics. The pH, NaH2PO4, and aniline concentration were used as independent variables to optimize the aniline removal by AN-1 at 10 °C, and a statistically significant (R (2) = 0.9230, p < 0.005) quadratic polynomial mathematical model was suggested. Moreover, an efficient biocomposite by assembling Fe3O4 nanoparticles onto the surface of AN-1 cells was constructed. Compared with free cells, the microbial cell/Fe3O4 biocomposite had the same biodegradation activity but exhibited remarkable reusability. This study highlights AN-1 might be a promising candidate for aniline removal from wastewater at low temperatures.