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排序方式: 共有898条查询结果,搜索用时 15 毫秒
881.
填料筛选与表面改性提高生物滴滤塔除含H_2S废气能力 总被引:2,自引:0,他引:2
生物滴滤塔的填料筛选及其表面性质改性优化可增加生物处理能力和系统抗冲击能力,通气比较了常用填料陶粒、鲍尔环、阶梯环,因去除效率较高,化学性质稳定筛选出陶粒为改性的基质,对表面进行FeCl3·6H2O理化高温改性,发现使用改性填料的生物滴滤塔系统H2S去除能力有较大提高,250mm填料高度实验中,在进气浓度1182~4396mg/m3范围内,去除率能稳定在95%以上,随机改变进气浓度153~4184mg/m3,系统均未失效表明其抗冲击能力较好。因而改性填料用于生物滴滤塔去除H2S可行。 相似文献
882.
好氧反硝化苯酚降解菌的分离鉴定及动力学 总被引:1,自引:0,他引:1
从驯化菌群中分离筛选出一株好氧反硝化苯酚降解细菌,经生理生化反应及16S rDNA测序,鉴定为Diaphorobacter属细菌。在好氧条件下,该菌株以苯酚为唯一碳源和能源,利用NO-3-N作为反硝化电子受体,其生长与反硝化特性研究表明:在接种量5%(体积分数),30℃,180 r/min振荡培养条件下,菌株降酚能力可达1 400 mg/L,同时,能有效去除初始浓度为165 mg/L的硝酸盐氮,60 h其去除率为91.5%,高含量苯酚对菌体生长有一定的抑制作用。应用Haldane方程对其生长过程进行动力学模拟,拟合曲线与实验测定值相关性良好,各参数分别为μmax(最大比增长率)0.324 h-1,Ks(半饱和常数)9.36 mg/L,Ki(抑制常数)146.72 mg/L,通过理论分析及实验验证得,该菌株苯酚降解动力学与其生长动力学表现出相似的趋势。 相似文献
883.
Influences of influent carbon source on extracellular polymeric substances (EPS) and physicochemical properties of activated sludge 总被引:6,自引:0,他引:6
It is necessary to understand the bioflocculation, settling and dewatering characteristics in the activated sludge process in order to establish more efficient operational strategies. The influences of carbon source on the extracellular polymeric substances (EPS) and flocculation, settling and dewatering properties of the activated sludge were investigated. Laboratory-scale completely mixed activated sludge processes were used to grow the activated sludge with different carbon sources of starch, glucose and sodium acetate. The sludge fed with acetate had highest loosely bound EPS (LB-EPS) and that fed with starch lowest. The amount of tightly bound EPS (TB-EPS), protein content in LB-EPS, polysaccharide content and protein contents in TB-EPS, were independent of the influent carbon source. The polysaccharide content in LB-EPS of the activated sludge fed with sodium acetate was lower slightly than those of starch and glucose. The sludge also had a nearly consistent flocs size and the sludge volume index (SVI) value. ESS content of the sludge fed with sodium acetate was higher initially, although it was similar to those fed with glucose and starch finally. However, the specific resistance to filtration and normalized capillary suction time fluctuated first, but finally were stable at around 5.0 × 108 m kg−1 and 3.5 s L g−1 SS, respectively. Only the protein content in LB-EPS weakly correlated with the flocs size and SVI of the activated sludge. But there was no correlation between any other EPS contents or components and the physicochemical properties of the activated sludge. 相似文献
884.
885.
Wenyu Zhang Weigang Wang Jie Li Shuangliang M Chaofan Lian Kun Li Bo Shi Mingyuan Liu Yanyu Li QingQing Wang Yele Sun Shengrui Tong Maofa Ge 《环境科学学报(英文版)》2021,33(4):53-63
A distinctive kind of organic carbon aerosol that could absorb ultraviolet-visible radiation is called brown carbon (BrC), which has an important positive influence on radiative budget and climate change. In this work, we reported the absorption properties and potential source of BrC based on a seven-wavelength aethalometer in the winter of 2018–2019 at an urban site of Sanmenxia in Fenwei Plain in central China. Specifically, the mean value of BrC absorption coefficient was 59.6 ± 36.0 Mm?1 at 370 nm and contributed 37.7% to total absorption, which made a significant impact on visibility and regional environment. Absorption coefficients of BrC showed double-peak pattern, and BrC had shown small fluctuations under haze days compared with clean days. As for the sources of BrC, BrC absorption coefficients expressed strong correlations with element carbon aerosols and primary organic carbon aerosols, indicating that most of BrC originated from primary emissions. The linear correlations between trace metal elements (K, As, Fe, Mn, Zn, and Pb) and BrC absorption coefficients further referred that the major sources of BrC were primary emissions, like coal burning, biomass burning, and vehicle emissions. The moderate relationship between BrC absorption coefficients and secondary organic aerosols suggested that secondary production of BrC also played an important role. The 120 hr backward air mass trajectories analysis and concentration-weighted trajectories analysis were also used to investigate potential sources of BrC in and around this area, which inferred most parts of BrC were derived from local emissions. 相似文献
886.
887.
Xie Huiming Wang Xiaopeng Shen Manhong Wei Chu 《Environment, Development and Sustainability》2022,24(9):10752-10767
Environment, Development and Sustainability - Industrial water pollution has become one of the largest threats to China's sustainable development and human welfare. Although China has... 相似文献
888.
Formation mechanisms of nitrous acid (HONO) during the haze and non-haze periods in Beijing, China
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Deng Lin Shengrui Tong Wenqian Zhang Weiran Li Fangjie Li Chenhui Ji Gen Zhang Meifang Chen Xinran Zhang Zhen Wang Maofa Ge Xiang He 《环境科学学报(英文版)》2022,34(4):343-353
As an important precursor of hydroxyl radical (OH), nitrous acid (HONO) plays a significant role in atmospheric chemistry. Here, an observation of HONO and relevant air pollutants in an urban site of Beijing from 14 to 28 April, 2017 was performed. Two distinct peaks of HONO concentrations occurred during the observation. In contrast, the concentration of particulate matter in the first period (period Ⅰ) was significantly higher than that in the second period (period Ⅱ). Comparing to HONO sources in the two periods, we found that the direct vehicle emission was an essential source of the ambient HONO during both periods at night, especially in period Ⅱ. The heterogeneous reaction of NO2 was the dominant source in period Ⅰ, while the homogeneous reaction of NO with OH was more critical source at night in period Ⅱ. In the daytime, the heterogeneous reaction of NO2 was a significant source and was confirmed by the good correlation coefficients (R2) between the unknown sources (Punknown) with NO2, PM2.5, NO2 × PM2.5 in period Ⅰ. Moreover, when solar radiation and OH radicals were considered to explore unknown sources in the daytime, the enhanced correlation of Punknown with photolysis rate of NO2 and OH ( × OH) were 0.93 in period Ⅰ, 0.95 in period Ⅱ. These excellent correlation coefficients suggested that the unknown sources released HONO highly related to the solar radiation and the variation of OH radicals. 相似文献
889.
Qi Yongfeng Wang Ziqian Ge Panle Wang Meiting Zhang Chuanling Wang Huawei Zhao Lingzhi Wu Jiang Li Yan 《Environmental science and pollution research international》2022,29(38):57566-57578
Environmental Science and Pollution Research - In this study, a method of preparing fertilizers with the fly ash from biomass power plants and the waste acid solution from flue gas desulfurization... 相似文献
890.
Wenjuan Zhang Bo Han Ramato Ashu Tufa Chuyang Tang Xunuo Liu Ge Zhang Jing Chang Rui Zhang Rong Mu Caihong Liu Dan Song Junjing Li Jun Ma Yufeng Zhang 《Frontiers of Environmental Science & Engineering》2022,16(4):46