微波强化光催化对直接耐酸大红4BS的降解

采用微波无极灯强化光催化对直接耐酸大红4BS的降解进行研究。初步考察反应温度、微波功率、pH值、催化剂TiO2浓度、曝气量、直接耐酸大红4BS初始浓度、外加氧化剂H2O2量等因素对直接耐酸大红4BS降解效果的影响。实验结果表明,反应最佳温度是55℃、最佳催化剂TiO2投加量为6 g/L;较低pH值、高微波功率、外加氧化剂H2O2有利于直接耐酸大红4BS的降解。与常规的光催化相比,微波减弱pH值和染料初始浓度对降解效率的影响。在优化工艺参数和未加H2O2条件下,反应4 h后,质量浓度为500 mg/L的直接耐酸大红4BS降解率达到90%。     

Membrane fouling controlled by coagulation/adsorption during direct sewage membrane filtration (DSMF) for organic matter concentration

Unlike the role of the membrane in a membrane bioreactor, which is designed to replace a sediment tank, direct sewage membrane filtration (DSMF), with the goal of concentrating organic matters, is proposed as a pretreatment process in a novel sewage treatment concept. The concept of membrane-based pretreatment is proposed to divide raw sewage into a concentrated part retaining most organics and a filtered part with less pollutant remaining, so that energy recovery and water reuse, respectively, could be realized by post-treatment. A pilot-scale experiment was carried out to verify the feasibility of coagulant/adsorbent addition for membrane fouling control, which has been the main issue during this DSMF process. The results showed that continuous coagulant addition successfully slowed down the increase in filtration resistance, with the resistance maintained below 1.0 × 10¹³ m^− 1 in the first 70 hr before a jump occurred. Furthermore, the adsorbent addition contributed to retarding the occurrence of the filtration resistance jump, achieving simultaneous fouling control and chemical oxygen demand (COD) concentration improvement. The final concentrated COD amounted to 7500 mg/L after 6 days of operation.     

Membrane fouling controlled by coagulation/adsorption during direct sewage membrane filtration (DSMF) for organic matter concentration

Unlike the role of the membrane in a membrane bioreactor, which is designed to replace a sediment tank, direct sewage membrane filtration(DSMF), with the goal of concentrating organic matters, is proposed as a pretreatment process in a novel sewage treatment concept. The concept of membrane-based pretreatment is proposed to divide raw sewage into a concentrated part retaining most organics and a filtered part with less pollutant remaining, so that energy recovery and water reuse, respectively, could be realized by post-treatment. A pilot-scale experiment was carried out to verify the feasibility of coagulant/adsorbent addition for membrane fouling control, which has been the main issue during this DSMF process. The results showed that continuous coagulant addition successfully slowed down the increase in filtration resistance, with the resistance maintained below 1.0 × 1013m~(-1) in the first 70 hr before a jump occurred. Furthermore,the adsorbent addition contributed to retarding the occurrence of the filtration resistance jump, achieving simultaneous fouling control and chemical oxygen demand(COD)concentration improvement. The final concentrated COD amounted to 7500 mg/L after 6 days of operation.     

水中硝基苯的快速气相色谱测定

直接进水样气相色谱法快速测定水中的硝基苯，分别采用2％QF－1＋1．5OV－1ChromosorbWAW－DMCS（80-100目）（Ⅰ）和5％聚乙醇-6000101白色担体（40－60目）（Ⅱ）为固定相的两种不锈钢柱，FID检测器，对硝基苯完成分离，本法进样4μl的检测限为0．25mg／L，能满足应急污染监测的需要。对柱Ⅰ，提出了一种改善分离的方法．