DO与MBBR反应器同步硝化反硝化脱氮关系研究

采用移动床生物膜反应器(MBBR)处理生活污水,考察了不同DO浓度下同步硝化反硝化脱氮效果与单个周期内DO和三氮、有机物的变化规律。结果表明:曝气量为60l/h(平均DO=3.0mg/l)时具有最佳同步硝化反硝化效果,可以作为MBBR同步硝化反硝化工艺的控制参数;单个周期内DO值的变化能在一定程度上反映有机物降解和硝化反应的进程,在COD或氨氮降解结束时均会出现跃升,可以作为单周期内曝气量和曝气时间的控制参数。     

城市污水生物脱氮除磷技术

介绍城市污水生物脱氮除磷工艺的发展,着重介绍近年来国内外在该领域开发的几种新型的工艺和技术,最后认为Ａ／Ｏ、Ａ＾２／Ｏ、ＣＡＳＴ等工艺技术成熟,运行简单可靠,在我国的市政污水处理领域将会有良好的应用前景。     

稻壳填料生物滤池对生活污水的脱氮研究

本试验以稻壳作为生物滤池填料处理模拟生活污水,对不同条件下生物滤池的脱氮效果进行了试验研究。研究表明,以稻壳为填料的生物滤池在滤速为2m/h、气水比为5:1、曝气方式为每间隔2小时曝气1小时、水温为20.5～26.5℃、进水COD负荷为0.24～0.72kg/(m3·d)、NH3-N负荷为0.03～0.09kg/(m3·d)的条件下其NH3-N的去除能力为60%～82%,有较强的脱氮能力,同时反应器中表现出了显著的短程硝化反硝化特征。     

关于Carrousel型氧化沟脱氮除磷方面的探讨

简要介绍了Carrousel型氧化沟生物脱氮除磷基本原理并对其实际运行效果和存在问题(出水TP超标)并就此进行分析和讨论。     

激光除锈在船舶分段除锈中的应用

针对绿色造船技术发展对船舶分段清理除锈的工艺需求，研究船舶分段激光除锈技术。对不同表面状况的船舶分段试验样板开展激光除锈试验，在清洗效果、作业环境和投资运营成本等方面，与传统的喷砂除锈进行对比，分析激光除锈效果及适用性。结果表明，激光除锈技术应用于船舶分段除锈，具有能耗低、污染小、工作环境好等优点。激光除锈可为船舶分段除锈提供一种新的方法。     

堵口围堰施工及拆除

本文论述了船坞堵口围堰的施工及拆除的主要施工工艺。施工关键是止水处理及起浮沉箱。     

太湖疏浚底泥养分特征及园林应用研究

疏浚后的底泥处置是港口、航道及湖泊治理中面临的问题之一。疏浚底泥具有陆地土壤的基本理化性质,富含植物生长所需的各种营养物质,可应用于园林绿化。为分析其可行性,选择太湖月亮湾疏浚底泥,分析了底泥p H、有机质含量、总氮、有效磷、速效钾、含水率、重金属Cu、Zn、Pb、Cd含量。结果表明:底泥含有丰富的氮、磷、钾元素等营养物质,且其他指标含量适中,因此月亮湾疏浚底泥作为景观园林用土是可行的;同时,太湖月亮湾的疏浚底泥未被重金属污染,可直接利用。     

船舶轮机常见缺陷与排除

船舶轮机为船舶提供动力．以保证船舶的正常航行与安全。本文就船舶轮机检验中常见缺陷谈点意见．与广大船员和同行商榷。     

Nutrient cycling and primary production in the marine systems of the Arctic and Antarctic

Primary production events in both the Arctic and the Antarctic are highly localized. Carbon-14 incubations that did not account for this caused antarctic primary production estimates to be revised too far downwards from the historic view of high productivity. The primary production regime in the Arctic is even more heterogeneous than in the Antarctic. Arctic primary production rates are in the process of being revised upwards because of a better spatial and temporal distribution of incubation experiments and a re-awakening of interest in estimating new production from the distribution of chemical variables. Similarly, recent examination of temporal changes in nitrate concentrations and recognition of the importance of ice-edge blooms has caused antarctic primary productivity to be revised upwards. In both the Arctic and the Antarctic, the ratio of “new” to total primary production is high, and neglect of this fact can lead to an underestimation of the potential that these regions have for influencing global cycles of bioactive chemicals. Some recent data on temporal changes in nitrate from Fram Strait emphasize the poor state of our knowledge by suggesting an unexpectedly high “new” production rate of 1 g C m⁻² d⁻¹ for a 35 day experiment that encountered an early Phaeocystis bloom. Chemical distributions suggest that new production over the shelf seas that border the Polar Basin is about 50 g Cm⁻² yr⁻¹.The shelves in the Arctic Ocean's marginal and adjacent seas comprise 25% of the total global continental shelf. These extensive shallow regions have much higher rates of primary production than the Polar Basin and may be globally significant sites of denitrification. Globally significant silica deposition could occur on these shelves or on the adjacent slopes.Because of the differences in geomorphology and stratification, global warming is likely to increase primary production in the Arctic and will probably decrease antarctic primary production.In addition to sharing high ratios of “new” to total primary production, high ammonium concentrations occur in the Arctic and Antarctic. It is possible that these accumulations arise from a strong repression of nitrification at low temperatures.     

支模拉杆拆除及防腐缺陷的防治

对混凝土施工中普遍存在的支模钢拉杆拆除及防腐质量缺陷的表现、原因、工程危害等进行分析,提出预防措施。     

CO_2清除新技术的研究现状与进展

CO2清除是人居密闭环境大气生命维持系统的重要组成部分,传统上多以填料吸收塔为吸收装置清除,此法易产生液泛、沟流、雾沫夹带等现象,从而大大降低气液传质速率,因此开发新型CO2清除技术具有重要意义。超重力技术、膜吸收法、分子筛型固态胺法、微藻法和离子液体法成为近年来CO2清除技术的研究热点,本文分别介绍了这几种技术,并对每种技术特点进行概述。     

钢桩内排泥技术在导管架拆除中的应用

内排泥作业是导管架拆除中的一个重要环节。主要介绍内排泥设备的原理及其在曹妃甸1-6油田单点导管架拆除中的应用,此设备的特点是工作效率高,安全可靠,无污染,适用范围广。     

污水处理厂恶臭污染物控制技术

介绍了城市污水处理厂臭气来源、成分及性质。针对目前国内外除臭技术的研究和发展情况,介绍了除臭系统的5种工艺:土壤法、生物滤池法、植物提取液喷淋法、离子法和化学法,分析了这些除臭方法的技术原理和特点。