[Effects of extremely low frequency electromagnetic radiation on cardiovascular system of workers].

Objective: To observe the exposure levels of extremely low frequency electromagnetic fields in workplaces and to analyze the effects of extremely low frequency electromagnetic radiation on cardiovascular system of occupationally exposed people.

Method: Intensity of electromagnetic fields in two workplaces (control and exposure groups) was detected with EFA-300 frequency electromagnetic field strength tester, and intensity of the noise was detected with AWA5610D integral sound level. The information of health physical indicators of 188 controls and 642 occupationally exposed workers was collected.

[Simultaneous nitrogen and phosphorus removal by aerobic granular sludge at normal and low temperatures].

The simultaneous nitrogen and phosphorus removal (SNPR) from real domestic wastewater using aerobic granular sludge (AGS) has been investigated. The effect of temperature changes on the SNPR of AGS was also studied. Two lab-scale sequencing batch reactors (SBRs), named as A and B, were operated for 254 days in alternating anaerobic-aerobic mode.