Peng Jianfeng

Notice of Retraction An identification method for the environmental risk sources of emergency accident

Along with the high-speed development of economy and society, emergency environmental pollution accident occurs frequently, resulting in tremendous losses. In order to reduce the hazard of emergency environmental accident, the government has introduced environmental pollution accident response and established early warning system. However, due to the lack of a complete and efficient screening and classification method for the environmental risk sources, it is difficult to confirm the sources of potential accidents, and cannot implement risk control to avoid sudden environmental pollution accidents in advance. This research established the method for screening environmental risk sources, presented an approach to classify the risk level of the environmental risk sources based on risk material dose — effect of the accident by using the dual-index risk assessment mode of risk material and key risk control factors of risk unit. The identification method of the environmental risk sources was simplified and the practicability and maneuverability was improved.

Organic and Nutrients Removal by 5 Aquatic Plants in Simulated Constructed Wetland

In order to study the contaminant removal characteristics of constructed wetlands (CWs) under high loadings, the performance of CWs planted with Arrowhead, Alisma, Monochoria korsakowii, Thalia dealbata and Oenan the were investigated, respectively, to determine the effects of plants in contaminant removal and for wetland plant selection. The experiment was conducted by sequencing batch feed, with the initial ammonia nitrogen(NH4+-N), total phosphorus(TP)and chemical oxygen demand (COD) concentration of37.7mg/L, 2.1 mg/L and 71.6 mg/L, respectively. The results showed that, for TP removal, the highest removal efficiency of79.01% was acquired in Arrowhead treatment, while other plants treatment showed little difference from unplanted control. For NH4+-N removal, all planted treatments showed superior removal rates than unplanted control, the highest removal rate of 63.67% was also acquired in Arrowhead treatment. For the COD removal, the removal rate of 6treatments all reached 40%-70% and planted treatments performed better than the control treatment, especially for Arrowhead. Generally speaking, Arrowhead was the best plant for CWs under high loadings. Plant factors played an important role in contaminant removal processes of CWs.