Oxidation rate in the preparation of polyferric sulfate coagulant

ＩｎｔｒｏｄｕｃｔｉｏｎＡｐｒｅｐａｒａｔｉｏｎｍｅｔｈｏｄｏｆｐｏｌｙｆｅｒｒｉｃｓｕｌｆａｔｅ (ＰＦＳ)ｃｏａｇｕｌａｎｔｗａｓｒｅｐｏｒｔｅｄｂｙＪａｐａｎｅｓｅｓｃｉｅｎｔｉｓｔｓ(Ｙａｎｇ ,1986)ｉｎｔｈｅｓｅｖｅｎｔｉｅｓ.ＳｉｎｃｅｔｈｅｅｉｇｈｔｉｅｓｔｈｅｐｒｅｐａｒａｔｉｏｎａｎｄａｐｐｌｉｃａｔｉｏｎｏｆＰＦＳｈａｖｅｂｅｅｎｗｉｄｅｌｙｉｎｖｅｓｔｉｇａｔｅｄｉｎＣｈｉｎａｂｅｃａｕｓｅｏｆｉｔｓｈｉｇｈｃｏａｇｕｌａｔｉｏｎｅｆｆｉｃｉｅｎｃｙｉｎｗａｔｅｒｔｒｅａｔｍｅｎ…     

Water quality issues in the Nakdong River Basin in the Republic of Korea

A framework for evaluating alternative management strategies for the Nakdong River Basin in the Republic of Korea (South Korea) was developed and applied jointly by Argonne National Laboratory in Argonne, Illinois, USA, and the Research Institute of Industrial Science and Technology in Pohang, South Korea. Water from this basin, the second largest in South Korea, supports a total population of more than 13 million people. Rapid industrial expansion, urbanization, and population growth have dramatically increased the demand for water and have severely degraded water quality, particularly near large industrial complexes and in the lower portion of the basin. Management strategies for the entire basin through to the year {dy2011} were evaluated with a computer model for basin-wide predictions of water flow and quality (HSPF). This continuous-event model was developed and calibrated using site-specific data for the basin over a two-year period (1994-1995) that included periods of both high (monsoonal) and low (drought) flows. Water quality impacts for different wastewater treatment strategies were assessed in terms of biochemical oxygen demand (BOD), nitrogen (N) and phosphorous (P) levels. The results of the study indicate that BOD levels in the main stem of the Nakdong River below the Kumhogang (a major tributary with low flow and heavy pollution loads) cannot be significantly improved by reducing direct BOD loads from point sources along the river. To reduce main stem BOD levels, the nutrient loading to the river must be reduced. In order to reduce these loads, additional advanced treatment methods (i.e., tertiary treatment) must be incorporated in the treatment facilities to remove N and P. The discharge inventory data further suggest that a large portion of N and P loads are derived from non-point agricultural practices. Reduction of these loads is difficult to accomplish and may require extensive modifications in agricultural and land-use practices. The modeling frame-work developed provides a means to evaluate these and other basin management strategies.     

污水集中处理区域建设项目环境影响评价制度的实施

与污水非集中处理相比，污水集中处理区域建设项目的水环境影响出现一些新特点。从污水集中处理区域建设项目应否接受保护行政主管部门的监管、污水集中处理区域建设项目水环境保护的分类管理标准、污水集中处理区域建设项目水环境影响评价的内容三个方面进行探讨。     

植物对二氧化硫的反应和抗性研究 Ⅸ.SO2伤害与叶组织电阻的变化

应用祝宗岭等(1982)改进的在稳流下测量植物组织电阻的中段电压降法,测定了小麦叶片在SO_2或HSO_3-引起伤害过程中的叶组织电阻变化,并与离子外渗的变化进行了比较。小麦接触不同浓度SO_2,如浓度在伤害阈值以下,组织电阻无明显变化.如以引起伤害的浓度处理,在出现伤害的初始症状前组织电阻就开始下降,而随着熏气时间的延长在出现初始症状时则有一急剧下降。浓度高,电阻下降也大。平行测定离子外渗的变化,它与组织电阻呈负相关,相关系数为0.936,回归方程为y=412.7-28.3x。 用不同浓度的HSO_3~-处理小麦离体叶,组织电阻也随浓度的增加而下降。 试验结果说明,测定叶组织的电阻可以比较灵敏地反映叶细胞质膜的结构和功能受损的程度。这方法可应用于原位叶或离体叶测定,也便于作动态观测。     

Determnation of ochratoxin A in grain by monoclonal antibody-based enzyme-linked immunosorbent assay

ＤｅｔｅｒｍｎａｔｉｏｎｏｆｏｃｈｒａｔｏｘｉｎＡｉｎｇｒａｉｎｂｙｍｏｎｏｃｌｏｎａｌａｎｔｉｂｏｄｙ－ｂａｓｅｄｅｎｚｙｍｅ－ｌｉｎｋｅｄｉｍｍｕｎｏｓｏｒｂｅｎｔａｓｓａｙＹａｎｇＣｈｕａｎｈｅ；ＬｕｏＸｕｅｙｕｎ；ＬｉｕＣｈａｎｇ；ＬｉＷｅｎ...     

废塑料生产汽油,柴油最佳生产工艺及设备

针对目前用废塑料生产汽油、柴油工艺及设备中存在缺点,研制开发出一套新工艺和设备。采用两段熔化两段催化工艺,原料不必分选,利用自制高效催化剂生产出符合国家标准的汽油、柴油。     

Potential nitrogen enrichment of soil and surface water by atmospheric ammonia sorption in intensive livestock production areas

Elevated atmospheric NH₃ levels near intensive livestock operations can add significant N to local agroecosystems. In this study, the potential atmospheric NH₃ sorbed by soil and water was assessed over a 2-year period starting October 2000 in an intensive livestock production area in southern Alberta, Canada. Fifty-two uneven grid sampling sites were selected in the 53,905 ha study area. The sorption rate of atmospheric NH₃ was estimated weekly by exposing distilled water and air-dried soil samples to the atmosphere at the sampling sites. The increases in NH₄–N content in the samples after 1-week exposure was regarded as an index of the atmospheric NH₃ sorbed for that week. The NH₃ sorption rates were highly variable across the 52 sites, with water ranging from 4 to 125 kg ha⁻¹ year⁻¹ with a mean of 22 kg N ha⁻¹ year⁻¹ and soil from 5 to 84 kg N ha⁻¹ year⁻¹ with a mean of 20 kg N ha⁻¹ year⁻¹. Considerable variation in NH₃–N sorption across the study area reflects the effects of size, direction (upwind or downwind) and proximity of nearby livestock operations or other NH₃ sources and operators’ activities around the sampling sites. The NH₃ sorption rate at each site also varied considerably in response to weather conditions. The high rate of NH₃ input poses a direct risk of surface water eutrophication in intensive livestock operation areas. If fertilizer recommendations are not reduced to account for NH₃ sorption by soil, excess N may also contribute to eutrophication through runoff and leaching.     

我国矿产资源开采中的损失贫化浅析

矿产资源开采中的损失与贫化问题直接关系到国家矿产资源的综合利用程度和可持续发展的问题。我国矿产资源开采中损失贫化大的问题 ,加速了资源枯竭的速度 ,缩短了矿井服务年限 ,加剧了矿产资源供求矛盾 ,造成金属大量流失、开采成本提高、经济效益差并严重阻碍了矿山的发展。文章分析了我国矿产资源开采中的损失贫化大的根源 ,并提出了解决矿石损失贫化的有效途径和低贫损开采模式。     

炭黑工业尾气净化及余热利用

研究表明，炭黑工业生产过程尾气中的可燃气态污染物ＣＯ、Ｈ２、及ＣＨ４等，采用直接燃烧法，是目前我国炭黑尾气净化和回收利用的最佳控制方法。直接燃烧法，不仅可将尾气中可燃气态污染物转变为ＣＯ２和Ｈ２Ｏ，且可回收利用其热量，余热利用率可提高４０％以上。经济技术评价表明，采用直接燃烧法和炭黑尾气发电，其经济效益和环境效益十分可观。