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河湖水质在一定程度上受河湖底泥的影响,要彻底改善水质就要对沉积的污泥进行处理。研究发现,有机高分子絮凝剂的种类及投加比例对河湖污泥脱水效果有着很大的影响。通过对特定湖泊污泥中投加不同型号、不同比例、不同用量的絮凝剂,比较其脱水效果,可以筛选出针对该种污泥的最佳絮凝剂投加使用方式,从而为污泥的大规模脱水减量化、资源化处置工程提供依据,并可大幅提高河湖污泥处置的经济效益,最终为河湖水质的改善提供了基础条件。  相似文献   
2.
对味精糟机械挤压脱水的作用进行了阐述,对影响挤压机的脱水工艺参数进行了大量试验。结果表明,压缩比、压强、挤压速度和过滤介质是影响脱水效果的主要因素.当压缩比为65% ~70% 、压强为0.21~0.30MPa、速度为(6.5% ~20% )/m in 和过滤介质(金属滤网)为50 目时,脱水效果最好,耗能量小  相似文献   
3.
Hou L  Liu M  Ding P  Zhou J  Yang Y  Zhao D  Zheng Y 《Chemosphere》2011,83(7):917-924
This study investigated the effects of sediment dewatering on the phosphorus transformations concerning about the production and emission of phosphine in the intertidal marsh of the Yangtze Estuary. The concentrations of matrix-bound phosphine ranged from 18.62-72.53 ng kg−1 and 31.14-61.22 ng kg−1 within the August and January exposure incubations, respectively. The responses of matrix-bound phosphine concentrations to sediment dessication demonstrate that the production (or accumulation) of matrix-bound phosphine significantly increased with water loss at the start of the emersion incubations. However, further dehydration inhibited the formation of matrix-bound phosphine in sediments. The significant correlations of matrix-bound phosphine with the organic-P bacteria abundance and alkaline phosphatase activities implicate that the production of matrix-bound phosphine within the dessication incubations was linked closely to the microbial decomposition of organic P. The emissions of phosphine generally decreased with sediment dewatering, with the fluxes of 7.51-96.73 ng m−2 h−1 and 5.34-77.74 ng m−2 h−1 over the exposure incubations of both August and January, respectively. Also, it is observed that the releases of phosphine during the entire exposure periods were affected not only by its production but also by sediment water and redox conditions.  相似文献   
4.
通过正交实验对丙烯酸改性破乳剂的聚合工艺条件进行研究。针对辽河油田锦采原油为研究对象,以原油破乳剂的相对脱水率为评价标准,确定了最佳的丙烯酸改性破乳剂的聚合工艺条件,最佳工艺条件是:引发剂量:3.5Wt%;聚合温度90—95℃:老化时间1.5h:滴加时间2.5h:调节剂用量:1.9Wt%。新研制破乳剂脱水性能优于市售原油破乳剂。  相似文献   
5.
Dehydrating large amounts of sludge produced by sewage treatment plants is difficult.Microwave pretreatment can effectively and significantly improve the dewaterability and hydrogen production of sludge subjected to anaerobic digestion. The aim of this study was to investigate the effects of different microwave conditions on hydrogen production from anaerobic digestion and dewaterability of sludge. Based on an analysis of the electric field distribution, a spiral reactor was designed and a continuous microwave system was built to conduct intermittent and continuous experiments under different conditions. Settling Volume, Capillary Suction Time, particle size, and moisture content of the sludge were measured. The results show that sludge pretreatment in continuous experiments has equally remarkable dehydration performance as in intermittent experiments; the minimum moisture content was 77.29% in the intermittent experiment under a microwave power of 300 W and an exposure time of 60 sec, and that in the continuous experiment was 77.56% under a microwave power of 400 W and an exposure time of 60 sec.The peak measured by Differential Scanning Calorimeter appeared earliest under a microwave power of 600 W and an exposure time of 180 sec. The heat flux at the peak was 4.343 W/g, which is relatively small. This indicates that microwave pretreatment induced desirable effects. The maximum yield of hydrogen production was 7.967% under the conditions of microwave power of 500 W, exposure time of 120 sec, and water bath at 55°C. This research provides a theoretical and experimental basis for the development of a continuous microwave sludge-conditioning system.  相似文献   
6.
为了促进企业开展节能减排和资源回用,在车间选取了一条干式复合线进行废气净化和溶剂回收及利用工艺研究,使用乙酸乙酯作为粘胶剂的稀释剂,废气净化和溶剂回收采用吸附浓缩+冷凝回收工艺,溶剂脱水提纯采用渗透汽化膜分离工艺.结果表明,这两种工艺组合十分适合干式复合线的溶剂回收和溶剂脱水提纯,处理装置具有溶剂回收率高、纯度好、运行...  相似文献   
7.
建立了大气颗粒物(PM_(2.5)、PM_(10))中10种糖醇类物质的离子色谱检测法。建立了大气颗粒物(PM_(2.5)、PM_(10))中丙三醇、赤藓糖醇、木糖醇、左旋葡聚糖、山梨醇、甘露聚糖、海藻糖、甘露醇、半乳聚糖、葡萄糖的高效阴离子交换色谱(HPAEC)与脉冲安培检测器(PAD)联用技术(HPAEC-PAD)的快速检测法。样品采用2 mg/L叠氮化钠溶液60 min振荡提取,经浓度为250 mmo L/L,流速为0.40 m L/min的氢氧化钠淋洗液洗脱30 min后,浓度逐步增加,60 min时达到500 mmol/L,10种物质被完全洗脱。该方法线性良好,线性回归系数大于0.999,实际样品测试加标回收率为84%~115%,精密度为0.5%~8.2%,对北京市2016年1月采暖季的大气颗粒物样品(PM_(2.5)、PM_(10))进行检测,其中左旋葡聚糖质量浓度最高,分别为(113±124)ng/m~3,(118±100)ng/m~3,其他9种物质均有检出。  相似文献   
8.
以脱水污泥为原料,分别采用恒温热干化和微波干化2种不同的方法考察脱水污泥的干化情况;对不同干化阶段的污泥进行显微观察,分析干化过程;并对2种干化过程的机理进行了探讨。实验结果表明随着加热温度的升高,污泥中水分脱除速度加快。加热温度低于100℃时,在120 min以内,热干化无法达到较高的脱水率。加热温度在140℃以上,加热时间120 min时,脱水污泥的脱水率可达到98.26%。微波干化法在功率为500~900 W,5~10 min内可使脱水污泥的脱水率到达99.20%以上。机理分析表明热干化传质与传热方向相反,微传热和传质的方向相同,因此微波干化具有更快速、高效的特点。  相似文献   
9.
如何有效处理含油污泥一直是困扰处理炼油污水的水处理场的一个现实问题。乌鲁木齐石化公司净化水厂通过长期实践认为,转筒式离心机对含油污泥的处理非常有效。  相似文献   
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