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The heating mode of a regenerative electric boiler in China’s rural area includes many problems such as the increase of heating cost, the high expense of government subsidies and tr investment cost, etc. Consequently, this paper proposes a new heating method that combines a regenerative electric boiler with distributed photo-voltaic power generation. The photovoltaic software PVsyst was used to simulate...
Potassium (K), one of main essential macronutrient elements in soil, is vital to the growth and metabolism of giant pandas (Ailuropoda melanoleuca) and its staple food bamboos (SFB). However, it is still unknown how the content of K in soil shapes giant panda distribution. To address this problem, we use geographical information system (GIS) and regression analysis to measure their spatial distribution...
In order to study the impact of Pb, Cd, Zn, and Cu released by Pb-Zn tailings on soil enzymes and soil properties involving soil carbon and nitrogen cycle processes, 32 soil samples were collected from 2 different types of agricultural fields (one for growing corn and one for growing rice) contaminated by Pb-Zn tailings close to Sidi village in southwestern China. The results revealed that the paddy...
Azoxystrobin has been largely applied as a kind of new strobilurin fungicide in recent years. Knowledge about the impact of the fungicide on soil biochemical properties is critical for understanding its effect on soil health. The effects of different doses of azoxystrobin (0, 0.1, 1, 10 mg·kg⁻¹) on cultivable soil microbial population, soil enzymatic activities, and soil respiration in Cambisol were...
Coal, as one of the most important sources of energy around the world due to the intensity of its exploiting and utilization, causes increasingly serious ecological problems, especially air pollution. Large amounts of pollutants are emitted during coal combustion, with NOx and SO₂ being the principal compositions. Therefore, desulfurization and denitrification are extremely urgent. Many technologies...
Based on the energy consumption data of power industry in the Beijing-Tianjin-Hebei region from 1995 to 2014, our paper first estimated CO₂ emissions using the IPCC carbon accounting methods. Then, starting from the perspective of the power industry chain – including power generation, transmission, and final consumption – we established the hierarchical LMDI decomposition model; decomposed driving...
The presence of perfluorinated compounds (PFCs) in ambient air particulates (PM2.5, PM10, and TSP) in Beijing was investigated in the current study. The results showed that PFBA, PFPeA, PFHpA, PFOA, PFNA, PFDA, PFUnA, PFDoA, and PFOS, were detected in all sizes of ambient air particulates. The concentrations of PFCs in TSP were slightly higher than those in PM10 and PM2.5. The concentrations of PFCs...
Phosphate-solubilizing bacteria (PSB) increase phosphate bioavailability, thereby reducing the application frequency of chemical fertilizers in the production of Nicotiana tabacum (tobacco). In this study, PSB were isolated from tobacco plants for the first time. These PSB were screened in vitro for their ability to solubilize inorganic P (Pi) when grown in association with tobacco plants. Thirty-six...
The objective of this research was to investigate the catalytic role of nitrogen-doped carbon nanotubes (NCNTs) in a bioreactor that contained Acidithiobacillus ferrooxidans (A. ferrooxidans) and waste printed circuit boards (WPCB). Factors that could refl ect the results, such as pH, oxidation-reduction potential (ORP), Fe²⁺, and leaching rate of copper were detected and calculated in the bioleaching...
The occurrence of 22 antibiotics, including eight quinolones, nine sulfonamides and five macrolides in water and sediment from Zizhuyuan Lake has been investigated in Beijing, China. Sediment samples were extracted by pressurized liquid extraction (PLE). Aqueous extracts from PLE and water samples were concentrated by solid-phase extraction (SPE) and detected by high-performance liquid chromatography-electrospray...
The aim of this study was to assess the effect of sodium alginate-immobilized bacteria and ultrasonic assistance on the biodegradation of oestrogens in soil. The studied oestrogens were oestrone (E1), oestradiol (E2), oestriol (E3), 17α-ethinylestradiol (EE2), and bisphenol-A (BPA). A central composite design was developed to determine the optimal conditions of the three variables (ultrasound time,...
Discovering how to best protect one of the most endangered animals in the world, giant pandas, has always been an important project in ecological studies. Moreover, researching the living environments of giant pandas and how to recover them is one of the most important elements to these studies. In order to more effectively protect the giant pandas and their habitats, we studied the changing of Xiaohegou...
Pharmaceutical wastewaters are generated through complex manufacturing processes that contain a variety of organic and inorganic constituents, and are usually characterized by a high concentration of chemical oxygen demand (COD), suspended solids, dissolved solids (salts), toxicity, and refractory compounds. In this paper, wet peroxide oxidation (WPO) was adopted to treat pharmaceutical wastewater...
A two-stage vertical-flow constructed wetland (VFCW) was built to advanced treatment of secondary effluent containing organic and inorganic nutrients (nitrogen and phosphorus) from a municipal sewage treatment plant in Beijing, China. The results showed that the VFCW effluent achieved 66-83% and 81-90% removal for COD and TP, respectively. Meanwhile, NH₄⁺-N and TN were almost completely removed during...
The city of Shiyan in Hubei Province is the largest city in the source of the South to North Water Diversion Project in China. The water of this project will be sent to Beijing, so water quality is very important. In the city district there is a 100 km river along a cross-strait with high-rise buildings, dense population, and converged sewage straight flow to the river. In our paper, the design of...
An analysis is made on the past and future trends of wastewater treatment in Beijing. Over the past several decades, great efforts have been made by Beijing to improve the urban wastewater treatment technology, reclaim municipal wastewater, and promote water reclamation and reuse. Until now, the utilization volume of reclaimed water has been increasing continuously. Generally, there are four categories...
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