Evaluation of a cost e ective technique for treating aquaculture water discharge using Lolium perenne Lam as a biofilter

Wastewater stabilization ponds generate low cost by-products that are useful for agriculture. The utilization of these by-products for soil amendment and as a source of nutrients for plants requires a high level of sanitation and stabilization of the organic matter, to maintain acceptable levels of soil, water and air quality. In this study, two aquaculture wastewater treatment systems; recirculating system and a floating plant bed system were designed to improve the quality of irrigation water in local communities with low income. In both systems the grass species Lolium perenne Lam was used as a plant biofilter while vegetable specie Amaranthus viridis was used to evaluate the performance of the system and the suitability of the phyto-treated water for irrigation. It was found that the harmful material removal rate for recirculating system was 88.9% for TAN （total ammonia nitrogen）, 90% for NO2--N, 64.8% for NO3--N while for floating plant bed system 82.7% for TAN, 82% for NO2--N and 60.5% for NO3--N. Comparative analysis of the efficiency of waste element removal between the two systems revealed that both systems performed well, however, plant growth was not robust for floating plant bed system while recirculating system is energy consuming. Although both systems did not attain sufficient levels of TN （total nitrogen） and TP （total phosphorus） load reduction, the treatment with L. perenne remarkably improved the irrigation water quality. A. viridis plants irrigated with the phyto-treated discharge water had lesser concentrations of heavy metals in their tissues compared to those irrigated with untreated discharge. The control plants irrigated with untreated discharge were also found to be highly lignified with few stems and small leaves.     

刻骨铭心的工作票

我是扬子石化炼油厂加氢车间的一名职工,如今已经从一线工作岗位转到管理岗位,但是十几年前发生的一起事故,让我至今刻骨铭心,我经常对年轻职工讲起它. 那是1995年,我刚参加工作不久,担任车间的安全员.8月的一天,我们厂裂解装置检修完毕,开车一次成功,大家的心情都很愉快.那一天是开车后的第一趟值班,正好轮到我.     

过滤器处理含聚采油污水滤料流失及改进技术研究

为解决石英砂过滤器处理聚驱污水过程中出现的滤料板结、反冲洗憋压、滤料流失问题,通过对石英砂过滤器进行了改造,利用搅拌装置破碎滤饼层,经现场测试,搅拌式石英砂过滤器反冲洗压力由原来的0.27~0.46Mpa降低到0.12~0.16 Mpa,滤料流失得以解决。在来水含油和悬浮固体平均41 mg/L和21 mg/L,总滤后水质含油达到5.8 mg/L以下,出水悬浮固体3.2 mg/L。油和悬浮固体去除率分别提高85%和86%。     

沙滤器回洗水薄膜过滤法

介绍了荷兰新近研究成功的适用于处理沙粒过滤器回洗水的XIGA薄膜法,及其参数、工作原理、适用条件和经济效益。     

沙滤器回洗水薄膜过滤法

介绍了荷兰新近研究成功的适用于处理沙粒过滤器回洗水的ＸＩＧＡ薄膜法，及其参数，工作原理，适用条件和经济效益。     

一种废气处理方法和装置

该发明公开了一种对半导体生产线、集成电路器件生产线等所产生的废气进行处理的废气处理装置。被风扇吸排的废气首先通过层状活性炭除味过滤器进行预过滤，将废气中的气相和／或汽相带有异味的物质除去；接着废气通过袋式除尘器将粉尘等除去。进入袋式除尘器内的废气已经通过预过滤器将附着性较强的气相和／或汽相的带有异味的物质除去，     

处理油性喷漆废气的工程应用

介绍了采用干式过滤+活性炭吸附脱附催化燃烧处理油性喷漆废气的工程设计实例[1],并对调试、运行情况进行了分析。结果表明:采用该工艺处理油性喷漆废气是成功的,只要选用合适的设计参数,定期更换与维护设备,其运行效果稳定,各项指标均可达到现行的排放标准。     

A/O型拔风跌水复氧过滤器处理农村生活污水

以A/O工艺为基础、生物滴滤池为原型,提出了一种A/O型拔风跌水复氧过滤器(ERWDF)试验装置,并以河南省平舆县韩庄村生活污水为研究对象,对试验装置稳定运行期间出水中COD、NH~+_4-N、TN和TP进行了测定,研究了不同条件下ERWDF的复氧效果和工艺系统的处理效率。结果表明:试验装置稳定运行期内对COD、NH~+_4-N、TN和TP的平均去除率分别为82.45%、85.79%、65.68%和45.49%,出水中总氮平均浓度能够满足河南省地方标准《农村生活污水处理设施水污染物排放标准》中一级标准的要求,说明ERWDF的复氧效果良好;水中溶解氧浓度在ERWDF内由上至下逐渐增加,随着水力负荷的增加,ERWDF中溶解氧浓度降低;本次试验装置水力负荷宜保持在3.00～5.00 m~3/(m~2·d)之间,回流比宜保持在300%,其污水处理费用仅为0.34元/t。     

微生物过滤法净化恶臭污染物

分析了处理恶臭污染物的吸附法、化学吸收法、催化燃烧法、生物处理法等优缺点 ,并介绍了微生物过滤器法净化恶臭物质的过程及工艺实例。