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991.
Yan Han Yun Cao Yueqing Xu Rong Liu Yifan Xu 《Journal of the Air & Waste Management Association (1995)》2020,70(2):180-192
ABSTRACTTo solve the disposal problem of municipal solid waste incineration bottom ash sludge (MSWI-BAS), using it as the main raw material to prepare lightweight aggregates (LWA) for resource utilization. Sintering is an important process to achieve the desired microstructure and material properties. This paper investigates the characteristics of LWA affected by single factor of sintering mechanism (sintering temperature, heating rate and soaking time). Results show that sintering temperature increased from 1130°C to 1160°C caused high-density microstructure materials gradually formed in LWA, leading to particle strength increased from 0.1 MPa to 3.64 MPa, particle density showed an overall upward trend, reaching a maximum of 916 Kg/m3 at 1160°C, and 1 h water absorption reduced from 68% to 25%. The heating rate of 15 K/min was beneficial to the formation of dense phase structure which could increase the particle strength, and the water absorption rate reached the lowest at this time, while the particle density was less affected by heating rate. When soaking time extended from 5 min to 20 min, particle strength and compressive density were gradually increased, and 1 h water absorption showed an overall downward trend, indicating that a longer soaking time was not conducive to the retention of pores. This study demonstrates that the utilization of MSWI-BAS to make high-performance LWA is feasible, along with the preferable environmental and economic benefits.Implications: MSWI-BAS were selected to produce lightweight aggregate (LWA), so that the sludge disposal problem is reduced. The effects of sintering temperature, heating rate and soaking time on the characteristics of LWA were investigated. Compact glass structures are formed at 1150°C and 1160°C which greatly improve the strength. The heating rate has little influence on the physical properties of LWA products. The particle density of LWA increases after the sintering soaking time reaches 15 minutes. 相似文献
992.
人类文明的发展,不断地在改变地球的生态环境,我们赖以生存的环境正在逐渐恶化,在城市中生活的人们远离了自然,生活环境已经不再健康,雾霾、水污染以及绿化的减少,都严重影响着人类自身的发展。在意识到环境对人类社会发展的重要性之后,人们开始重视城市环境的改造,引入原生态环境景观,希望获得人类与自然的和谐与平衡,在这样的背景下城市公园的概念受到了广泛的关注,城市公园的景观设计开始追求原生态,综合考虑了对原生态环境的保护和利用,不断完善城市公园的设计,发挥原有自然环境的作用,让人工设计与自然天成融为一体,打造城市中心的绿肺,改善城市生态环境,维护人类社会生产生活与自然环境的平衡,为人类建设更为宜居的生活环境。 相似文献
993.
994.
微囊藻毒素(microcystins, MCs)是由水华蓝藻释放出来的一种有生物活性的环庚肽化合物,具有较强的肝毒性,MC-LR是其分布最广的和毒性最强的一个亚型。罗氏沼虾(Macrobrachium rosenbergii)是我国比较重要的一个水产养殖品种,但由于养殖水体富营养化程度比较严重,常常爆发蓝藻水华,给其健康养殖带来较大的威胁,但是关于MCs对罗氏沼虾的毒性机制研究的报道较少。因此,使用环境相关浓度的MC-LR(0.5和5μg·L~(-1))处理罗氏沼虾1、2和3周,通过组织学观察、免疫组化定位、氧化应激指标测定以及荧光定量PCR技术探究养殖水体中常见浓度MCs对罗氏沼虾的毒害效应及潜在机制。研究结果表明,较高环境相关浓度(5μg·L~(-1))的MCs会在罗氏沼虾肝胰腺中显著富集,诱导氧化应激,破坏肝胰腺的形态和结构,并且破坏作用随暴露时间延长而加剧,并发生细胞凋亡。而较低浓度的MCs(0.5μg·L~(-1))对肝胰腺的影响相对较小,但是依然会诱导罗氏沼虾肝胰腺氧化应激,并且在长时间作用下也会给肝胰腺组织带来损伤。上述研究结果证明,环境相关浓度的MCs对罗氏沼虾也有一定的毒害作用,并且毒害作用呈剂量与时间依赖效应。 相似文献
995.
Zhihao Si Xinshan Song Xin Cao Yuhui Wang Yifei Wang Yufeng Zhao Xiaoyan Ge Awet Arefe Tesfahunegn 《Frontiers of Environmental Science & Engineering》2020,14(1):4
996.
Jian Wang Qun Wang Xueli Gao Xinxia Tian Yangyang Wei Zhen Cao Chungang Guo Huifeng Zhang Zhun Ma Yushan Zhang 《Frontiers of Environmental Science & Engineering》2020,14(1):6
997.
间羟基苯甲醛生产废水的处理 总被引:1,自引:0,他引:1
研究了萃取法处理间羟基苯甲醛生产废水的工艺条件,并在此基础上进行了废水的生化处理试验。结果表明:萃余液稀释15倍后用活性污泥法处理,出水COD能达到排放标准。 相似文献
998.
Feng Shi-Jin Bai Zhen-Bai Chen Hong-Xin Cao Ben-Yi Lu Shi-Feng Chen Yun-Min 《Environmental science and pollution research international》2018,25(15):14614-14625
Environmental Science and Pollution Research - A dual-permeability hydro-biodegradation model is developed to describe the leachate flow in municipal solid waste (MSW) and predict the long-term... 相似文献
999.
Ying Cao Shuang Du Ting-Ting Chen Meng Chen Hua-Jie Wang 《Journal of Polymers and the Environment》2018,26(12):4430-4440
Zein, one of corn processing byproducts, has excellent film-forming ability. However, zein does not have intrinsic antibacterial or antioxidant activity which limits its direct applicability as active food packaging material. In the present study, the rod-shaped micro-sized ZnO crystals were incorporated into zein films to construct zein-based active films as active packaging material with antibacterial property. The morphologies, structural analysis and sizes of ZnO crystals were analyzed by field emission scanning electron microscope and X-ray diffraction. Prepared zein films were evaluated for ZnO loading and distribution. Furthermore, antibacterial activities on Gram-negative bacteria and Gram-positive bacteria were tested by using the disc diffusion method. Lastly, the stability of zein-based active films under the different storage temperature and humidity was investigated. The results showed that zein based-active films had well mechanical properties, stability and antibacterial activities, which were related to the sizes of ZnO crystals in films. 相似文献
1000.
Minghong Wu Jiajia Xiang Fenfen Chen Cao Fu Gang Xu 《Environmental science and pollution research international》2017,24(25):20291-20299
Antidepressants are gaining public attention because of increasing reports of their occurrence in environment and their potential impact on ecosystems and human health. Continuous input of pharmaceuticals into rivers, through psychiatric hospital or wastewater treatment plant (WWTPs) effluent, may cause adverse effects on the aquatic ecosystems of the receiving water bodies. This work investigates the occurrence and sources of 8 antidepressants in main stream and tributaries of Huangpu River in Shanghai. The detected concentrations of the selected antidepressants ranged from low nanogram per liter to 42.9 ng L?1 (fluoxetine) in main stream and ranged from low nanogram per liter to 33.7 ng L?1 (fluoxetine) in tributaries. To study the effect of hospital or wastewater treatment plants (WWTPs) on environment, the upstream and downstream samples were analyzed. Generally, antidepressants had greater concentrations in downstream than that in upstream of the WWTPs or hospitals. It is suggesting that WWTPs and hospitals may introduce pollution into water environment. A preliminary risk assessment was conducted: none of the eight target compounds yielded risk quotient (RQ) values more than 0.1, thus indicating that no adverse effect is expected in water environment. These results will provide background data for future antidepressants pollution control and management in Shanghai, China. 相似文献