试论城镇污水处理厂的监管

分析了当前污水处理厂普遍存在的问题,提出城镇污水处理厂是保证区域水环境质量的关键,以及污水处理厂应实行企业化运营的思路,阐述了政府各部门在城市收水系统中各自的职能和分工,并对污水处理厂出水超标处理方式进行了探讨。     

陕西省2000年天气气候异常变化与自然灾害

分析陕西省2000年天气气候变化发现，隆冬降雪明显增多，春旱异常严重，秋霖明显，沙尘暴天气明显增加，这是多年来未曾见到的现象。异常的天气气候使得多种自然灾害并发。     

超细粉煤灰基成型吸附剂的动态吸附实验

以粉煤灰为原料制备成型吸附剂，对水溶液中亚甲基蓝和Cr⁶⁺进行动态吸附研究，绘制穿透曲线，利用Origin软件对实验数据分析处理，得出穿透曲线的通式C_t=A₁－A₂〖〗1+(t/t₀)^p+A₁。结果表明，初始浓度C₀=25 mg/L，填料高度不同时，达到穿透点的时间随填料高度的增加而增加；填料高度h=200 mm，初始浓度不同时，达到穿透点的时间随初始浓度的增加而减小；该吸附剂对有机染料和重金属离子均有较好的吸附性能；穿透曲线通式的回归线性相关系数表明，该通式可很好地反映超细粉煤灰成型吸附剂的动态吸附过程。     

微波诱导Fe2O3/沸石负载型催化剂催化氧化焦化废水的研究

以天然沸石为载体,采用尿素均匀沉淀法制备了Fe2O3/沸石负载型催化剂(简称负载催化剂),研究其在微波辐射下对焦化废水的处理效果,探讨了负载催化剂投加量、微波辐射功率、微波辐射时间等因素对处理效果的影响,并考察了负载催化刑的重复使用性能.结果表明,天然沸石、于350℃焙烧得到的负载催化刑和于550℃焙烧得到的负载催化剂...     

Zinc accumulation and synthesis of ZnO nanoparticles using Physalis alkekengi L

A field survey and greenhouse experiments were conducted using Physalis alkekengi L. to investigate strategies of phytoremediation. In addition, ZnO nanoparticles were synthesized using P. alkekengi. P. alkekengi plants grew healthily at Zn levels from 50 to 5000 mg kg⁻¹ in soils. The plants incorporated Zn into their aerial parts (with mean dry weight values of 235-10,980 mg kg⁻¹) and accumulated biomass (with a mean dry weight of 25.7 g plant⁻¹) during 12 weeks. The synthesized ZnO nanoparticles showed a polydisperse behavior and had a mean size of 72.5 nm. The results indicate that P. alkekengi could be used for the remediation of zinc-contaminated soils. Moreover, the synthetic method of synthesizing ZnO nanoparticles from Zn hyperaccumulator plants constitutes a new insight into the recycling of metals in plant sources.     

How changing grain size affects the land surface temperature pattern in rapidly urbanizing area: a case study of the central urban districts of Hangzhou City,China

Environmental Science and Pollution Research - Urbanization has led to the rapid and large-scale changes in land use and land cover and has affected the spatial distribution of land surface...     

Polystyrene nanoplastics affect growth and microcystin production of Microcystis aeruginosa

Nanoplastics are widely distributed in freshwater environments, but few studies have addressed their effects on freshwater algae, especially on harmful algae. In this study, the effects of polystyrene (PS) nanoplastics on Microcystis aeruginosa (M. aeruginosa) growth, as well as microcystin (MC) production and release, were investigated over the whole growth period. The results show that PS nanoplastics caused a dose-dependent inhibitory effect on M. aeruginosa growth and a dose-dependent increase in the aggregation rate peaking at 60.16% and 46.34%, respectively, when the PS nanoplastic concentration was 100 mg/L. This caused significant growth of M. aeruginosa with a specific growth rate up to 0.41 d^?1 (50 mg/L PS nanoplastics). After a brief period of rapid growth, the tested algal cells steadily grew. In addition, the increase in PS nanoplastics concentration promoted the production and release of MC. When the PS nanoplastic concentration was 100 mg/L, the content of the intracellular (intra-) and extracellular (extra-) MC increased to 199.1 and 166.5 μg/L, respectively, on day 26, which was 31.4% and 31.1% higher, respectively, than the control. Our results provide insights into the action mechanism of nanoplastics on harmful algae and the potential risks to freshwater environments.

     

Exploring the spatial-temporal variations and policy-based driving force behind groundwater contamination and remediation research in past decades

Environmental Science and Pollution Research - Groundwater has been recognized as one of the most critical and vulnerable natural sources which is utilized in potable water supply, agricultural...     

Urban carbon emission intensity under emission trading system in a developing economy: evidence from 273 Chinese cities

Environmental Science and Pollution Research - The international community has generally recognized the key role of developing countries’ cities in reducing carbon emissions, an elemental way...     

Facile in situ synthesis of silver nanocomposites based on cellulosic paper for photocatalytic applications

Environmental Science and Pollution Research - In this work, various photocatalysts were synthesized with an impregnation-precipitation process to in situ decorate Ag-based nanoparticles (NPs,...