净水厂排泥水的特性及处理

简要介绍了绍兴市宋六陵净水厂净水工艺和水厂排泥水污泥特性试验情况,初步确定了水厂排泥水的处理方案。     

水厂排泥水处理系统工艺优化试验研究

针对南水北调引江水净水气浮工艺排泥水特点,进行了斜管混凝沉降浓缩性能、药剂投加量、水力负荷、固体负荷、排泥量和PAM絮凝浓缩脱水投加量、比阻的试验研究,并优化确定了工艺参数.结果表明,三氯化铁和活化硅酸组合混凝处理能显著改善斜管浓缩池排泥水的脱水性能,沉降斜管浓缩池最大水力负荷为3.0 m3/(m2·h),最大固体负荷...     

自来水厂排泥水处理的国内外发展概况

自来水厂产生的废水主要来自沉淀池或澄清池的排泥水和滤池的反冲洗水,这些废水如果不经处理直接排入水体,不但严重污染水体,而且浪费大量的水资源。在当前水资源严重缺乏,水环境污染日益严重的情况下,作为受水源污染之害的自来水厂更不应该将排泥水直接排入水体,而使之成为污染源。自来水厂排污水处理和污泥处置工作势在必行,刻不容缓,人们对此要引起足够的重视。     

芥园水厂排泥水处理工程的工艺设计

对天津市芥园水厂排泥水处理工程工艺设计中的有关设计原理、基础数据的确定作了概述.该工程设计最大干泥量为42.82 t/d,建成投产后,每日节水量可达到水厂日供水量的2%～4%.     

水厂排泥水浓缩试验之负荷研究

进行了水厂排泥水的现场中试水力负荷和固体负荷试验研究。结果表明,投加PAM可提高斜板浓缩池抗击负荷的能力,投加PAM＋快速搅拌可进一步提高斜板浓缩池抗击负荷的能力。     

粉煤灰调理自来水厂排泥水污泥的比阻

自来水厂污泥直排水体会使水环境恶化,为此开展了掺调理剂改善其脱水性能的试验研究。结果表明,自来水厂污泥不宜采用混凝处理,而利用电厂粉煤灰作调理剂,可使污泥比阻大幅度下降,改善了脱水性能;细粉煤灰的最佳投量是20g/100mL,粗粉煤灰的最佳投量是30g/100mL;粉煤灰与污泥混合形成的滤饼掺入一定比例的煤炭后可做成燃料,实现了自来水厂污泥的焚烧处置。     

紫外线处理排泥水的试验研究

采用紫外线处理水厂排泥水并进行了经济分析。结果表明,紫外处理技术对排泥水有很好的杀菌灭藻效果,并能避免氯消毒带来的消毒副产物问题;静态试验下,灭活水中剑水蚤需要较大的紫外辐射剂量,且照射时间较长;浊度会影响紫外透光率,应尽量降低原水浊度,以保证紫外对生物的灭活效果。     

大丰二水厂排泥水处理系统设施改造

以大丰市二水厂排泥水处理系统为例,针对在运行过程中综合排泥池存在严重淤积进而导致排泥水处理系统相关设备故障频发这一问题,对原排泥水处理系统设施进行改造,采取水力搅拌和冲刷、增设扰流搅拌设备、对综合排泥池及配管进行改造等措施,使得排泥水处理系统相关设备故障发生频率大幅降低,为安全生产提供了可靠保障。     

斜管沉淀池处理净水厂排泥水工艺优化研究

以净水厂排泥水为研究对象,考察了斜管沉淀池对排泥水的处理效果。结果表明,随着进泥负荷的不断增大,斜管沉淀池出水的上清液浊度和CODMn含量都逐渐升高,阴离子聚丙烯酰胺或聚合氯化铝与聚丙烯酰胺的联合投加都可以改善排泥水的沉降性能,且只要聚丙烯酰胺的投加量大于2 mg/L,就可以形成较大且密实的矾花;投加聚丙烯酰胺药剂后,可应对由于净水工艺进行沉淀池冲洗后排泥水性质的恶化,改善排泥水的沉降性能,降低出水浊度,提高出泥浓度。     

结团絮凝工艺处理水厂排泥水的中试研究

以水厂的铁盐排泥水为处理对象,采用结团絮凝工艺进行了规模为1.3-5.4m3/h的动态试验研究,优化了处理工艺的控制条件.试验结果表明,采用静态混合器进行混合反应的处理效果优于其他混合装置;当进水SS为103-1154mg/L时,适宜的PAC、PAM[分子质量为(1-1.2)x104ku)]投加量分别为(5.1-15.3)、(0.3-2.7)gm/L,最佳搅拌转速为10r/min,水流上升流速为30-80cm/min,在该试验条件下,沉淀池出水浊度<5NTU、污泥含水率<97%、污泥颗杜沉速>10mm/s.     

谈污水处理厂污泥处理系统

主要论述了污水处理厂的污泥处理系统,从污泥处理的各个环节,包括排泥、污泥浓缩、污泥调理、污泥机械脱水和污泥处置等几方面进行了阐述,行之有效的控制污泥生产,以保证污水处理厂水质合格达标。     

Optimization of alum recovery from water treatment sludge‐case study: Samannoud water treatment plant,Egypt

Alum recovery from water treatment sludge is a promising technique applied for reducing the virgin coagulant demand and the sludge volume and safe disposal of the sludge. The aim of the current study is to optimize alum recovery process from alum sludge in Samannoud water treatment plant, Egypt by acidification technique using sulphuric acid and evaluate the effect of total solids (TS) content in the sludge on alum recovery process. Results showed that the optimal mixing time for alum recovery was 60 min for clariflocculator sludge, whereas 15 min for thickener sludge. Optimum pH value was 1.50 for alum recovery from different sludge types. At optimum conditions, acidification experiments showed that alum recovery percent and sludge volume reduction for clariflocculator sludge were 83 and 91.2%, respectively, versus 35.9 and 45%, respectively, for thickener sludge. Besides, alum recovery and sludge reduction decreased with the increase in TS content in the sludge.     

Bacterial response to a shock load of nanosilver in an activated sludge treatment system

The growing release of nanosilver into sewage systems has increased the concerns on the potential adverse impacts of silver nanoparticles (AgNPs) in wastewater treatment plants. The inhibitory effects of nanosilver on wastewater treatment and the response of activated sludge bacteria to the shock loading of AgNPs were evaluated in a Modified Ludzack-Ettinger (MLE) activated sludge treatment system. Before shock-loading experiments, batch extant respirometric assays determined that at 1 mg/L of total Ag, nitrification inhibitions by AgNPs (average size = 1-29 nm) and Ag⁺ ions were 41.4% and 13.5%, respectively, indicating that nanosilver was more toxic to nitrifying bacteria in activated sludge than silver ions. After a 12-h period of nanosilver shock loading to reach a final peak silver concentration of 0.75 mg/L in the MLE system, the total silver concentration in the mixed liquor decreased exponentially. A continuous flow-through model predicted that the silver in the activated sludge system would be washed out 25 days after the shock loading. Meanwhile, a prolonged period of nitrification inhibition (>1 month, the highest degree of inhibition = 46.5%) and increase of ammonia/nitrite concentration in wastewater effluent were observed. However, nanosilver exposure did not affect the growth of heterotrophs responsible for organic matter removal. Microbial community structure analysis indicated that the ammonium-oxidizing bacteria and nitrite-oxidizing bacteria, Nitrospira, had experienced population decrease while Nitrobacter was washed out after the shock loading.     

杨家堡污水净化厂污泥处理系统大修改造方案

针对太原市杨家堡污水净化厂污泥处理系统出现的问题进行了分析,并对污泥进泥及溢流问题、脱水机房问题、污泥处理系统自控问题提出了相应的改造方案,对杨家堡污水净化厂污泥的彻底处理提供了理论依据。     

多台冷水机组空调系统的优化控制

以两台容量相同并联运行的冷水机组空调系统为例,通过绘制负荷比与比功率关系曲线,确定了最优负荷分配策略。分析结果表明,应用该方法确定多台冷水机组空调系统负荷分配策略可以减少系统能耗。     

气浮工艺在水厂排泥水处理中的应用

针对气浮工艺在水厂排泥水处理应用中的实际问题,考察了投药量、进泥量、进泥浓度、进气量和药剂种类对气浮处理效果的影响。结果表明,投药量、进泥量和进泥浓度对气浮上清液浊度和出泥含固率均有影响;进气量对气浮影响效果较小;阴离子聚丙烯酰胺在处理效果上比阳离子聚丙烯酰胺稍差,但其在经济性和上清液回用方面要优于阳离子聚丙烯酰胺。     

外压浸入式超滤膜处理排泥水上清液的研究

采用外压浸入式中空纤维超滤膜处理排泥水重力浓缩上清液。试验结果表明,当温度从16℃下降到2℃时,TMP从0．032MPa上升到0．055MPa。排泥水经6h重力浓缩后,上清液浊度为9．99～80．33NTU,CODMn为5．36～18．64mg／L;超滤膜出水浊度为0．08～0．11NTU,CODMn小于3mg／L,颗粒数小于1个／mL。在排泥水上清液水质波动较大情况下,经超滤处理后,出水水质优于常规处理工艺出水,加氯后可直接进入清水池。     

Dilatometric measurement of bound water in wastewater sludge

The dilatometric technique is used to measure bound water in aerobically digested sludge. It is found that air liberated from the sludge sample during the freezing of the sludge water affects the quantity of unfrozen water (interpreted as bound water) determined by dilatometry. Both the freezing temperature and the solids concentration affect the measured bound water content. It is also found that the precision of dilatometry decreases with decreasing solids concentration and that the accuracy of dilatometry cannot be determined since there is no independent measure of unfrozen water.