制浆废液降低普钙水分的应用研究

针对我国采用高临界流动水分的磷矿进行湿法生产普钙普遍存在产品水分达不到部颁标准的难题,直接采用制浆废液（利用其主要对环境有害成分之一——MNA作减水剂）进行降低普钙水分的研究和应用.实验结果表明,添加少量的减水剂MNA可显著降低国内朝阳、昆阳、浏阳和国外摩洛哥等单种磷矿以及昆阳-朝阳混矿的矿浆粘度和水分.采用国产昆阳-朝阳混矿进行工业生产试验结果表明,添加0.35%～0.4%干矿粉重量的减水剂MNA,不仅可使球磨添加水量从145 kg降至103 kg,矿浆含水量从30.5%降至27%,成品肥含水量从16.24%降至13.77%,而且可使有效磷从10.67%升至12.24%,转化率由86.57%提高到90.45%,矿浆细度由90.18%提高到93.12%.实验和工业生产试验表明,直接用造纸制浆废液降低普钙水分,既确保和改善了普钙的产品质量,又治理了环境污染,取得了较好的经济、环境和社会效益.     

垃圾焚烧发电过程中的二次污染物控制处理技术

概述了二口恶英、重金属、酸性气体、灰渣等垃圾焚烧二次污染物的形成机理，并详细介绍了通过控制垃圾焚烧条件、尾气处理以及吸附等方法，可以有效控制二口恶英类污染物的排放；重金属的控制可以用除尘器或使用相应的吸附剂处理；采用较为成熟的烟气处理技术，可以控制处理酸性气体；灰渣可采用固化稳定化和酸或其他溶剂提出法处置。     

钴铜铁三元类水滑石材料催化过硫酸氢钾复合盐降解苯酚

采用共沉淀法制备过渡金属钴、铜、铁组成的钴铜铁三元类水滑石材料(CoCuFe-LDH),用于催化过硫酸氢钾复合盐(PMS)降解水中苯酚,并考察了初始pH、CoCuFe-LDH催化剂投加量、PMS用量对苯酚降解效率的影响。实验结果表明:CoCuFeLDH对PMS的催化活性较高;在pH为中性,催化剂为0.20g/L,PMS为2.5mmol/L,苯酚为50mg/L的条件下处理60min,苯酚的去除率可达96%;当催化剂投加量分别为0.05、0.10、0.15g/L,反应40min时,苯酚的去除率分别为76%、82%和91%。自由基猝灭实验表明,CoCuFe-LDH/PMS催化体系中存在硫酸根自由基和羟基自由基,但硫酸根自由基为主要活性自由基。     

焚烧秸秆对城市空气质量的影响及对策

通过夏收季节农民焚烧秸秆的烟尘，引起对城市环境空气质量变化的分析，结果表明：焚烧秸秆对城市环境空气质量有很大影响，使环境空气质量明显下降，而主要污染物为可吸入颗粒物PM10。有关部门应采取有效措施，禁止焚烧秸秆，同时应积极为农民寻找合理利用秸秆的途径，减少对城市空气的烟尘污染。     

制浆废液降低普钙水分的应用研究

针对我国采用高临界流动水分的磷矿进行湿法生产普钙普遍存在产品水分达不到部颁标准的难题,直接采用制浆废液(利用其主要对环境有害成分之一--MNA作减水剂)进行降低普钙水分的研究和应用.实验结果表明,添加少量的减水剂MNA可显著降低国内朝阳、昆阳、浏阳和国外摩洛哥等单种磷矿以及昆阳-朝阳混矿的矿浆粘度和水分.采用国产昆阳-朝阳混矿进行工业生产试验结果表明,添加0.35%～0.4%干矿粉重量的减水剂MNA,不仅可使球磨添加水量从145 kg降至103 kg,矿浆含水量从30.5%降至27%,成品肥含水量从16.24%降至13.77%,而且可使有效磷从10.67%升至12.24%,转化率由86.57%提高到90.45%,矿浆细度由90.18%提高到93.12%.实验和工业生产试验表明,直接用造纸制浆废液降低普钙水分,既确保和改善了普钙的产品质量,又治理了环境污染,取得了较好的经济、环境和社会效益.     

苯胺废水处理技术研究进展

综述了有毒、难生物降解废水———苯胺废水的各种处理技术及基本原理 ,这些处理技术主要包括物理、化学、生物等方法     

新型沸石填料间歇硝化反应器的研究

介绍一种新型沸石填料 ,用于提高生物脱氮系统中硝化反应器的硝化性能。试验结果表明 ,应用了沸石填料的硝化反应器的硝化性能得到了显著提高 ,在脱氮效率和速率上 ,与普通生物载体硝化反应器相比具有明显的优势。硝化反应器连续运行 17d ,出水氨氮基本在 1mg/L以下 ,氨氮去除率在 97%以上。该系统停止运行 5 0d后再次启动 ,一周内硝化性能得以恢复     

Determination of 4-tert-octylphenol, 4-nonylphenol and bisphenol A in surface waters from the Haihe River in Tianjin by gas chromatography-mass spectrometry with selected ion monitoring

The estrogenic pollutants 4-tert-octylphenol (OP), 4-nonylphenol (NP) and bisphenol A (BPA) were determined in surface water samples from the Haihe River, Tianjin, China. The analytes were extracted and concentrated from 300 ml acidified water samples by liquid–liquid extractions using dichloromethane, derivatized with trifluoroacetic anhydride, and quantified by gas chromatography–mass spectrometry (GC–MS) with selected ion monitoring (SIM). Among the samples collected from 14 sampling sites, only one sample was found to have a relatively high concentration of BPA (8.30 μg l⁻¹) and NP (0.55 μg l⁻¹). The concentrations of OP, NP and BPA in the other samples were in the range of 18.0–20.2, 106–296 and 19.1–106 ng l⁻¹, respectively. Recoveries for OP, NP and BPA in the spiked water samples were all over 80%.     

A pilot study of mercury liberation and capture from coal-fired power plant fly ash

The coal-fired electric utility generation industry has been identified as the largest anthropogenic source of mercury (Hg) emissions in the United States. One of the promising techniques for Hg removal from flue gas is activated carbon injection (ACI). The aim of this project was to liberate Hg bound to fly ash and activated carbon after ACI and provide high-quality coal combustion products for use in construction materials. Both bench- and pilot-scale tests were conducted to liberate Hg using a thermal desorption process. The results indicated that up to 90% of the Hg could be liberated from the fly ash or fly-ash-and-activated-carbon mixture using a pilot-scale apparatus (air slide) at 538 degrees C with a very short retention time (less than 1 min). Scanning electron microscope (SEM) evaluation indicated no significant change in fly ash carbon particle morphology following the thermal treatment. Fly ash particles collected in the baghouse of the pilot-scale apparatus were smaller in size than those collected at the exit of the air slide. A similar trend was observed in carbon particles separated from the fly ash using froth flotation. The results of this study suggest a means for power plants to reduce the level of Hg in coal-combustion products and potentially recycle activated carbon while maintaining the resale value of fly ash. This technology is in the process of being patented.