EMMC process for combined removal of organics, nitrogen and an odor producing substance

In order to improve the process performance regarding the removal of organics, nitrogen, and an odor-causing compound (sulfide) contained in domestic wastewater, an entrapped-mixed-microbial cell (EMMC) with and without humic substances for both fixed and moving carrier reactors and conventional suspended growth culture (i.e. conventional activated sludge process) were investigated simultaneously. Both synthetic (simulated to the organics concentration of general domestic sewage) and actual domestic wastewater were investigated under operational conditions of 12 h of hydraulic retention time (HRT) with 1 h of aeration and 1 h of non-aeration, and 6 h of HRT with continuous aeration, at a room temperature of 25 +/- 2 degrees C. It was found that entrapping humic substances in the EMMC carriers had no impact on the removal of organics, nitrogen, and the odor-producing compound. Additionally, the performance of the EMMC moving carrier system for the removal of these pollutants is similar to that of the EMMC fixed carrier system. In general, the EMMC associated systems which provide high solids retention time achieve a better removal of chemical oxygen demand (COD), nitrogen, and the odor-producing substance than the suspended growth system for both HRTs of 6 h (continuous aeration) and 12 h (1 h of aeration and 1 h of non-aeration). Both the fixed and moving carrier EMMC processes, therefore, have the potential for improvement or replacement of the existing conventional activated sludge process with regard to improving the effluent qualities (such as COD, nitrogen and odor-producing compound) for reuse/disposal.     

全密闭电石炉尾气治理及综合利用

由于全密闭电石炉的尾气性质特殊，治理和综合利用存在一定的难度。本文总结了国内电石生产厂家的多种治理和利用方法，并根据国家产业政策的要求，提出了适合我国国情的电石炉烟气治理及综合利用方法。     

纳米二氧化钛处理含砷废水的研究

研究了无机纳米材料二氧化钛对含砷废水的处理效果.实验主要从纳米二氧化钛的溶液pH值、不同投加量、实验温度、吸附搅拌时间、静置时间等方面对除砷效率进行了研究,并通过模拟水样和实际水样的对比,分析了纳米二氧化钛处理含砷废水的实际可行性.     

烟气脱汞技术现状简述

火力发电厂是我国最主要的烟气排放源, 期间微量元素汞将以不同的形式排放到大气中,对环境造成很大的危害.汞控制技术一般分为燃烧前脱汞,燃烧中脱汞及燃烧后脱汞.燃烧后脱汞是汞控制技术的主要方式,近些年研究异常活跃,主要表现在2个方面:一方面加强了各种吸收剂的研究,另一方面加强利用现有的脱硫装置脱汞的研究.     

CONTROL OF LAKE PHOSPHORUS WITH ALUMINUM SULFATE: DOSE DETERMINATION AND APPLICATION TECHNIQUES1

ABSTRACT: Nutrient diversion does not always bring about prompt and sufficient reduction in lake phosphorus concentration due to recycling from nutrient rich sediments. Certain lakes and reservoirs may continue to experience nuisance algal blooms and require additional restorative steps. The phosphorus precipitation/inactivation technique is a procedure to remove phosphorus from the water column and to control its release from sediments in order to achieve P-limiting conditions to algal growth. Aluminum salts have been used in advanced waste water treatment to remove phosphorus and this technology was extended to lake rehabilitation. Guidelines for dose calculation and application are generally lacking, and are provided in this report. The dose determination suggested here allows maximum application of aluminum to bottom sediments and thus emphasizes long term control of phosphorus recycling. Dose can be calculated directly from the alkalinity of the water to be treated. Titration of lake water samples of Varying alkalinity allows the establishment of the relationship between residual dissolved aluminum, alkalinity, and dose which can then be employed for lake scale applications of alum to lakes and reservoirs. Application equipment and procedures are described. These depend on site characteristics and treatment objectives and include lakeside stores, a distribution pipe, and an application barge and manifold. Alum may also be used to meet other restoration objectives including the treatment of problem flows and the reduction of particulate concentrations.     

考虑油滴碰撞聚结的斜板除油过程模拟

考虑离散油滴在油田废水除油过程中发生的油滴碰撞聚结现象,模拟得出斜板除油器内全部油滴的动态信息,用于斜板除油器除油效率的计算.对矩形同向流斜板除油过程的模拟研究表明:油滴的碰撞聚结会增加斜板除油的效率;当废水的原始含油浓度增大时,斜板除油的效率会增大,碰撞聚结对除油效率提高的影响也越大;废水流动速度提高及斜板的倾斜角度增加均会使斜板的除油效率降低,但此时油滴碰撞聚结对除油效率的影响仍很明显.     

SC菌剂对废水中Cu~(2 )去除的初步研究

用研制的SC菌剂作生物吸附剂 ,研究了其在不同菌铜比 ,pH、温度及作用时间条件下对Cu2 的去除效果。结果表明 ,在获得的最佳条件下 ,对不同Cu2 浓度的印刷电路板废水中Cu2 的去除效果明显 ,达 95 48%和 86 74%。     

Electrochemical remediation of copper (II) from an industrial effluent Part II: three-dimensional foam electrodes

A batch recycle removal of copper ions from an industrial effluent by means of copper foam cathodes was tested. A constant current of 750 A was applied to the cell in order to perform the reduction. Copper depletion was investigated at different solution flow rates and a removal greater than 98% was obtained with a flow rate of 1000 l/h. The influence of initial metal concentration on copper deposition and current efficiency is also discussed.     

生石灰孔结构对高温脱硫性能的影响

喷钙脱硫工艺的炉内脱硫率 ,不仅受工艺参数的影响 ,还与石灰石分解生成的新生CaO或直接喷入的CaO的表面结构有关。本研究用同一石灰石经不同方法 (煅烧、过烧、煅烧 -水合 -脱水等 )制备了四种具有不同比表面积和孔结构的生石灰。高温脱硫研究表明 :这四种不同孔结构的生石灰 ,具有不同的脱硫率。通过对高温脱硫前后吸着剂宏观结构变化的对比 ,发现半径小于 30 的孔易被反应产物堵塞 ,因而脱硫能力有限 ,而半径大于 5 0 的孔对脱硫更有效。本研究将为提高炉内喷钙的脱硫率、研制和开发高效脱硫剂提供新的途径。     

铁碳微电解法预处理猪场沼液中氨氮的研究

铁碳微电解是新型的污水处理技术,为了研究猪场沼液中氨氮的去除,将铁碳微电解技术应用于预处理难降解的厌氧沼液中的氨氮。经预先浸泡处理后的铁碳已达到吸附饱和,以此铁碳材料,分别采用了单因素实验和正交试验,用可见光分光光度法测试氨氮的浓度。单因素实验确定了铁碳微电解法影响氨氮去除的因素,选取pH值、反应时间、铁碳比为正交试验因素,通过正交试验得到,当温度为(20±1)℃,铁碳比为1∶1,pH值为3,反应时间为60 min时去除氨氮的效果最好,去除率为34.01%。铁碳微电解法预处理猪场沼液有一定的应用前景。