利用天然矿物处理造纸黑液   总被引：9，自引：1，他引：8  

周平 《地学前缘》2000,7(2):541-545

实验使用未经处理的天然矿物处理草浆黑液 ,然后用其沉渣烧制陶瓷制品 ,形成一条与其他草浆黑液处理方法不同的思路。处理过程中 ,用硫酸溶液调节黑液的 pH值 ,再用天然矿物进行处理 ,处理效果最好的条件是 :pH =3,凹凸棒石粒度小于 6 0目 ,用量为 1g/ 10mL黑液 ,此时 ,COD值去除率约为 50 %。以处理废液后的天然矿物沉渣为主要原料 ,通过不同配方和不同工艺条件可烧制出合格的建筑陶瓷材料 ,这对小型浆厂具有一定的实用性 ,既处理草浆黑液 ,又利用天然矿物沉渣 ,不会造成二次污染。  相似文献   

南极中山站及毗邻地区湖泊与冰雪CODMn研究          下载免费PDF全文

谢周清  孙立广  赵俊琳 《极地研究》2000,12(2)

在 CHINARE- 1 5考察期间对中山站及毗邻地区的湖泊和冰雪进行了采样。它们的CODMn指数与中国《地面水环境质量标准》相比 ,可分为三类 :一类水质所占比重最大 ,大约为56% ,二类和三类分别为 37%、7%。各类水体的 CODMn指数主要为自然源所贡献 ,人为污染不明显。湖水的 CODMn指数是生物生长状况、有机质含量、盐度和水体氧化还原程度的综合体现 ,新鲜降雪样的 CODMn指数指示了该地区的大气洁净度。  相似文献   

珠江口水域化学耗氧量(COD)的分布特征   总被引：5，自引：1，他引：4  

杨美兰  林钦  黄洪辉  甘居利  蔡文贵  吕晓瑜  王增焕  李纯厚  杜飞雁 《海洋通报》2005,24(4):22-26

2002年5月和8月对珠江口伶仃洋水域水质化学耗氧量（COD）进行了调查研究,结果表明：该水域近期COD含量变幅在0.41～2.72mg/L之间,平均值为1．21mg/L;区域分布呈北部向南部水域逐渐递减以及近岸水域含量大于远岸的变化趋势;夏季COD的含量高于春季：以我国Ⅰ类海水水质COD含量≤2mg／L标准评价,超标率为15％;COD含量与同期（春、夏季）的悬浮物含量呈正相关性,与无机氮和活性磷酸盐含量在夏季呈负相关性。  相似文献   

刚果（金）加丹加省科卢韦齐铜矿床地质特征及矿床成因     

王洪亮 《江苏地质》2015,39(1):143-148

科卢韦齐(Kolwezi)铜矿床位于刚果(金)南部Kolwezi市区边部西南方向。通过研究铜矿体所在地层矿化元素的含量及变化系数,得出地层与矿体矿化特征的一致性。查明了矿床规模、矿体形态产状及矿物共生组合特征、物质成分特征、结构构造特征,并对矿物生成世代进行了详细划分,加深了对矿床成矿地质特征的认识。在前人研究的基础上,提出科卢韦齐铜矿床属于热液变质改造沉积型砂页岩铜(钴)矿床,具有典型的层控特征。  相似文献   

畜禽养殖粪污水中N、P等含量的研究及对环境影响的分析     

寇利卿 《地下水》2015,(1):73-74,117

根据不同畜禽养殖污水产生系数与污染物平均浓度,计算出不同畜禽养殖粪污中COD、TN和TP的含量。并对畜禽养殖业产生的污染物对环境可能产生的污染影响进行分析。进一步说明畜禽粪污必须要妥善处理,否则会对环境造成危害,尤其是对水环境的影响将是巨大的。  相似文献   

The influences of various anthropogenic sources of deterioration on meiobenthos (Ostracoda) over the last 100 years in Suo-Nada in the Seto Inland Sea, southwest Japan     

Irizuki T  Takimoto A  Sako M  Nomura R  Kakuno K  Wanishi A  Kawano S 《Marine pollution bulletin》2011,62(10):2030-2041

This study focuses on the relationships of water and sediment quality with meiobenthos (Ostracoda) over the past 100 years, using a sediment core obtained from Suo-Nada in the Seto Inland Sea, Japan. We compared high-resolution ostracode results with geochemical and sedimentological data obtained from the study core as well as with rich environmental monitoring data that are available. R-mode cluster analysis revealed two bioassociations (BC, KA). Until the1960s, assemblages continued to show high diversity. They changed in approximately 1970, when excessive nutrients and organic matter began to be supplied, and most species decreased in number. All species of bioassociation BC were dominant again by the mid-1990s; however, those of bioassociation KA containing infaunal species did not increase and have been absent or rare since the 1970s because organic pollution of sediments has continued to date. This study provided robust baseline for ostracode-based long-term environmental monitoring in East Asia.  相似文献   

海水化学需氧量烘箱加热测定方法的研究   总被引：1，自引：0，他引：1       下载免费PDF全文

沈加正  侯沙沙  刘鹰  罗荣强 《海洋科学》2011,35(8):1-4

在海水化学需氧量(COD)测定中, 利用烘箱代替海洋监测规范中的电炉对样品进行加热; 探讨了烘箱加热测定法所需的加热条件及其测定范围, 并通过实际水样测定了解此法的精确度和准确度。结果表明, 烘箱加热测定法具有与海洋监测规范方法同等水平的精确度和准确度, 并且在大批量样品测定中具有省时、省电、省力的优点, 具有较好的应用价值。  相似文献   

高氯水体中COD测定的氯耗氧曲线校正法分析          下载免费PDF全文

陈志军 《盐湖研究》2009,17(3):32-35

介绍了一种重铬酸钾法测定高氯水体中COD的改进分析方法——氯耗氧曲线校正法,测定中不加隐蔽剂HgSO4,通过调整催化剂Ag2SO4的加入时间,测得表观COD值,再扣除Cl-对COD的贡献值,得出实际COD值。与标准方法相比,该法准确度高、精密度好,还可避免汞盐污染环境。  相似文献   

Stochastic modeling applications for the prediction of COD removal efficiency of UASB reactors treating diluted real cotton textile wastewater     

Kaan Yetilmezsoy  Zehra Sapci-Zengin 《Stochastic Environmental Research and Risk Assessment (SERRA)》2009,23(1):13-26

A three-layer Artificial Neural Network (ANN) model (9:12:1) for the prediction of Chemical Oxygen Demand Removal Efficiency (CODRE) of Upflow Anaerobic Sludge Blanket (UASB) reactors treating real cotton textile wastewater diluted with domestic wastewater was presented. To validate the proposed method, an experimental study was carried out in three lab-scale UASB reactors to investigate the treatment efficiency on total COD reduction. The reactors were operated for 80 days at mesophilic conditions (36–37.5°C) in a temperature-controlled water bath with two hydraulic retention times (HRT) of 4.5 and 9.0 days and with organic loading rates (OLR) between 0.072 and 0.602 kg COD/m³/day. Five different dilution ratios of 15, 30, 40, 45 and 60% with domestic wastewater were employed to represent seasonal fluctuations, respectively. The study was undertaken in a pH range of 6.20–8.06 and an alkalinity range of 1,350–1,855 mg/l CaCO₃. The concentrations of volatile fatty acids (VFA) and total suspended solids (TSS) were observed between 420 and 720 mg/l CH₃COOH and 68–338 mg/l, respectively. In the study, a wide range of influent COD concentrations (COD_i) between 651 and 4,044 mg/l in feeding was carried out. CODRE of UASB reactors being output parameter of the conducted anaerobic treatment was estimated by nine input parameters such as HRT, pH, COD_i concentration, operating temperature, alkalinity, VFA concentration, dilution ratio (DR), OLR, and TSS concentration. After backpropagation (BP) training combined with principal component analysis (PCA), the ANN model predicted CODRE values based on experimental data and all the predictions were proven to be satisfactory with a correlation coefficient of about 0.8245. In the ANN study, the Levenberg-Marquardt Algorithm (LMA) was found as the best of 11 BP algorithms. In addition to determination of the optimal ANN structure, a linear-nonlinear study was also employed to investigate the effects of input variables on CODRE values in this study. Both ANN outputs and linear-nonlinear study results were compared and advantages and further developments were evaluated.  相似文献   

填埋场渗滤液COD降解曲线的拟和与优化简法     

杨军  黄涛  杨立中 《地质灾害与环境保护》2004,15(3):75-78

结合上海老港垃圾填埋场渗滤液的实际监测数据．建立了COD降解模型．介绍了利用Excel及其非线性规划求解工具拟合并优化填埋场渗滤液COD降解曲线的新方法。结果表明：①填埋场渗滤液COD衰减过程符合一级反应过程;②用Excel软件包拟合曲线简捷明了．拟和精度高,具有较大的工程应用价值。  相似文献