预处理+多级膜浓缩+蒸发结晶+膜电解组合工艺在造纸废水零排放工程上的应用

以国内某工业园区中水回用示范项目1.75万m3/d造纸废水零排放工程为例,对工程采用的预处理+多级膜浓缩+蒸发结晶+膜电解组合工艺流程及设计参数情况进行了重点说明,对部分工艺单元的运行数据进行了技术分析。运行数据表明:臭氧活性炭生物滤池对造纸废水二级出水残留COD的去除率>50%,机械加速沉清池对一级反渗透浓水硬度的去除率达到70%,离子交换器出水硬度稳定在0~4 mg/L,NaCl浓缩反渗透单元对Cl-的再浓缩比约为3倍。最后介绍了对于膜浓缩和蒸发结晶系统改造的工程经验,并从技术总结的角度阐明完善的工艺流程及技术保障措施是该工业废水零排放工程获得成功的根本。     

青海农用沼气池微生物群落结构及差异基因功能分析

文章以产气性能不同的青海农用沼气池为研究对象,利用宏转录组学技术分析了温度最高和最低时期污泥样品的微生物组成、差异基因表达及代谢过程。物种注释表明4个样品中最优势的种类均为细菌,且较优势类群有假单胞菌属(Pseudomonas)、硫单胞菌属(Sulfurimonas)、海螺菌属(Marinospirillum)和拟杆菌门未分类属(norank_p__Bacteroidetes)。差异基因的筛选结果表明产气性能不同的沼气池样品具有更多的差异基因。通过KEGG pathway富集分析发现,产气好样品的代谢通路表达量更大,且对碳水化合物和氨基酸的利用率及产能更高。同时,参与氨基酸代谢、核苷酸代谢、碳水化合物代谢以及能量代谢等过程的差异表达基因显著富集,说明这几种代谢途径在青海农用沼气池微生物的代谢过程中占据重要地位。4个样品两两比较可知,产气性能不同的比较组差异基因注释到的代谢通路更多,且微生物及其代谢的差异更大。     

Screening on oil-decomposing microorganisms and application in organic waste treatment machine

As an oil-decomposable mixture of two bacteria strains ( Bacillus sp. and Pseudomonas sp. ), Y3 was isolated after 50 d domestication under the condition that oil was used as the limited carbon source. The decomposing rate by Y3 was higher than that by each separate individual strain, indicating a synergistic effect of the two bacteria. Under the conditions that T = 25-40℃, pH = 6--8, HRT (Hydraulic retention time) = 36 h and the oil concentration at 0.1%,Y3 yielded the highest decomposing rate of 95.7 %. Y3 was also applied in an organic waste treatment machine and a certain rate of activated bacteria was put into the stuffing. A series of tests including humidity, pH, temperature, C/N rate and oil percentage of the stuffing were carried out to check the efficacy of oil-decomposition. Results showed that the oil content of the stuffing with inoculums was only half of that of the control. Furthermore, the bacteria were also beneficial to maintain the stability of the machine operating. Therefore, the bacteria mixture as well as the machines in this study could be very useful for waste treatment.     

污泥农用中的资源利用价值分析

以奥地利的基本情况为主,对污泥中的有效成分有机物、氮、磷等进行量化分析和总结,同时对污泥农用的经济效益及生态安全性的保障进行了分析和探讨。在此基础上,结合我国目前污泥处理处置现状,对相关问题进行了分析,以期为我国污泥处理处置提供借鉴作用,实现污泥可持续的发展与利用。     

常熟市锻压机床厂与你携手共进

我国是珍上人均资源相对贫乏的发展中国家，再生资源的开发利用是目前解决我国资源缺乏、环境污染等问题的现实途径。随着改革开放的不断深入，再生资源行业的结构正发生巨大变化，近年来，乡镇企业的迅速发展，个体私营企业的不断增加，回收厍工机械需求多样化、小型化，质量可靠结构实用、价格适中的产品更受市场欢迎，依靠科技投入研制更好，更新的产品来适应日渐变化着的回收行业，使再生行业上一个新的台阶已是摆在回收加工机械生产企业面前的必然之路。