造粒流化床技术用于活性污泥分离浓缩的试验研究

运用上向流造粒流化床处理装置进行了西安市北石桥污水净化中心活性污泥分离浓缩的半生产性试验。在总水力停留时间为 2 0min的条件下 ,形成了良好粒状污泥 ,经滤网式泥斗分离后的污泥含水率达到 92 .99%～ 94 .36 % ,出水SS浓度可达到 5mg/L左右。该装置可代替二沉池和污泥浓缩池两个构筑物 ,同时达到泥水分离和污泥浓缩的目的。粒状污泥具有的致密构造和优越的形态学特征是其达到良好处理效果的根本原因。     

南洲水厂排泥水处理工艺的研究与设计

通过对排泥水进行沉降试验,得到了南洲水厂排泥水处理系统设计的基本数据.供水量为100万m3/d的南洲水厂排泥水处理系统工艺流程为:排泥水调节、浓缩、平衡、离心机脱水.该系统在调试运行期间,各工艺单元均能按照设计要求正常工作,脱水后的污泥含固率达到36.3%～39.2%,取得较好的处理效果.     

月浦水厂排泥水浓缩处理工艺初步研究

对上海市月浦水厂的沉淀池排泥水进行浓缩工艺研究 ,旨在为今后建设给水厂排泥水浓缩处理设施提供设计和运行的必要基础资料。试验结果表明 ,斜板浓缩池对给水厂排泥水可以产生良好的浓缩效果。浓缩后的泥水含固率 >3% ,上清液SS <15 0mg/L。     

排泥水处理技术在闵行一水厂的应用

通过对污泥沉降特性研究 ,闵行一水厂排泥水处理采用收集、浓缩、平衡、投加聚丙烯酰胺 (PAM )、离心机固液分离的工艺流程。浓缩池上清液能达标排放 ,离心机分离水的泥饼含固率≥4 0 % ,PAM加注率 0 8～ 1 5kg/t干泥。研究表明 ,该工艺可作为黄浦江水系水厂排泥水处理工艺设计依据     

长江水源水厂排泥水处理研究

对长江水源水厂排泥水处理进行了研究,确定了长江水源水悬浮固体含量与浊度的关系,对水厂干泥量和排泥水总量进行了估算;通过动态浓缩试验,确定了斜板浓缩池运行优化条件;测定了排泥水的颗粒粒径分布、固体成分组成和污泥比阻;并简要介绍了污泥机械脱水和泥饼处置方法.     

临江水厂排泥水处理系统设计

为减少临江水厂自身运行给水体造成的污染,建设排泥水处理系统,将沉淀池排泥水及滤池反冲洗水统一收集后,通过调节、浓缩、机械脱水,提高污泥含固率,使排泥水处理后达标排放。临江水厂二期采用高速重力斜板澄清池工艺,由于需要加细砂,砂的漏失增加了日产干污泥量。详细介绍了工程方案的选择和设计参数,并指出了一些设计中值得探讨的问题。     

给水厂排泥水浓缩试验研究

给水厂排泥水的小试和现场中试研究结果表明,投加PAM后快速搅拌排泥水(不小于300r/min)30s左右,矾花出现早,絮凝颗粒大,泥水分离效果好。斜板浓缩池的斜板间距5～8.6cm对出水效果的影响不显著,浓缩效果相差不大。最佳斜板间距为5.5～8cm。当投加PAM出水效果不佳时采用快速机械搅拌装置能较好地提高排泥水的浓缩效果。     

深圳市南山水厂一期工程工艺设计与自控要点

深圳市南山水厂一期工程规模20万m3/d,为保证供水水质达到直接饮用目标,采用预处理-强化常规处理-臭氧活性炭深度处理工艺,并对排泥水进行回用和污泥处置.阐述了水厂工艺主要构筑物设计参数和自控条件,并对其中药剂品种与投加点、滤池恒水位过滤与初滤水排放、活性炭滤池增设砂垫层、污泥浓缩池排泥控制等一些关键技术进行说明.     

临江水厂排泥水处理系统设计

按照《上海市供水专业规划》和《关于加强本市环境保护和建设的实施意见一行动计划》要求,实施临江水厂排泥水处理系统的建设来减少水厂自身运行的废水对水体造成的污染。水厂沉淀池排泥水及滤池反冲洗水统一收集后,通过调节、浓缩、机械脱水,使污泥含固率提高,排泥水处理后达标排放。     

深圳朱坳水厂排泥水沉降特性试验研究

给水厂生产废水的循环利用在缺水地区是较有前途的节约用水方式之一。试验采集滤池反冲洗水、沉淀池排泥水进行了污泥沉降特性的研究,得出了不同含固率反冲洗水、排泥水的自然沉降特性和高分子絮凝剂(PAM)最佳投量下的沉降特性,掌握了其沉降速度、底泥含固率、压密点污泥浓度以及上清液浊度等变化规律。为给水厂污泥浓缩,脱水工艺的选择和优化,以及脱水机械的选型提供基础数据。     

Pilot study of a fluidized-pellet-bed technique for simultaneous solid/liquid separation and sludge thickening in a sewage treatment plant.

A fluidized-pellet-bed separator with movable sludge hoppers was applied in pilot scale for the separation and thickening of activated sludge mixture liquid. Under the condition of suspension SS around 4,000 mg/L, polymer (CJX103, cationic, MW 5 x 10(6)) dose at a dry solid ratio of 0.003 and upward flow rate at 5.4 m/hr, the fluidized pellet bed performed solid/liquid separation and sludge thickening well. The SS concentration of the treated water was about 5 mg/L on average and the moisture content of the sludge after screening for 5 min was less than 94%, which is much lower than that after conventional settling and thickening and easy to be finally disposed. At a higher upward flow rate of 7.2 m/hr, similar results could also be obtained but higher polymer dose (solid ratio of 0.004) was required. The morphological characteristics and density-size relationship of the granular particles formed in the fluidized pellet bed were also investigated by image analysis and settling velocity measurement of individual particles. The two-dimensional fractal dimension was evaluated to be 1.6-1.8, showing a good quasi-spherical morphology of the granular particles with their density much higher than the conventional flocs. The results of the pilot study indicate a possible way to innovate the conventional secondary settling and gravitational thickening processes for solid/liquid separation and sludge handling, especially for small scale wastewater treatment plants to reach the goal of space saving and higher treatment efficiency.     

给水厂污泥脱水技术改造设计方案研究

针对以黄河水为原水的给水厂污泥进行了混凝及优选比阻调理试验,结果表明:当进行给水厂污泥脱水技术改造方案设计时,可以不经过混凝处理,直接利用电厂粉煤灰作为比阻调理剂。细粉煤灰的最佳投加率为20%,粗粉煤灰的最佳投加率为30%,使污泥比阻由1013数量级降至1010数量级,改善了污泥脱水性能,所得滤饼含水率仅为40%~50%,易于剥离,能耗低,所得滤液的色度、浊度、CODMn均达到可直接回用标准。当进行技改工程设计时,建议选用带式压滤机或板框压滤机,既适应粉煤灰调理剂,又可节约投资。     

Sludge thickening performance of mesh filtration process.

Small-scale wastewater treatment facilities play an important role in improving the aquatic environment in many countries. Although sludge treatment is essential for overall wastewater treatment, it is difficult for small-scale facilities to use mechanical equipment or other facilities. As the first step of the sludge treatment, it is important to develop a convenient sludge thickening process for small-scale facilities. In this work, we examined the sludge thickening performance of a mesh filtration system: the mesh opening sizes of 100-500 microm, and the sludge (3,000-9,000 mg-SS/L) was obtained from a domestic wastewater treatment facility. The filtration was carried out only under the hydraulic pressure between the water level and the effluent port connected to the mesh filter module. The sludge reduction rates were in the range of 85-95% for 6-7 h; the initial filtration rate was very high, but the rate decreased with a decrease in hydraulic pressure due to the reduction of the water level in the vessel. In addition, the effluents (passed through the mesh) contained very low SS and could be directly discharged into the environment.     

Effect of low power ultrasound on aerobic/anoxic digestion of activated sludge

The effect of low power ultrasound on aerobic/anoxic digestion of activated sludge was investigated. First, dehydrogenate activity (DHA) and special oxygen uptake rate (SOUR) were detected to indicate the change of biological activity of sludge induced by ultrasound. Single-factor experiments showed that when the ultrasonic frequency was 28 kHz, the optimal ultrasonic density and exposure time were 0.15 W/mL and 10 min, respectively. Through orthogonal tests, the optimal ultrasonic parameters for aerobic/anoxic digestion were found to be a ultrasonic density of 0.15 W/mL, ultrasonic exposure time of 10 min and interval time of 12 h. The aerobic/anoxic digestion was improved by ultrasonic pretreatment, the VSS reduction at the optimal conditions was increased by 35.73%, compared with the control. It can be concluded that low power ultrasonic pretreatment is a valid method for improving aerobic/anoxic biodegradability of activated sludge.     

增效结团流化床处理春季低浊水的中试研究

以水库春季低浊水为处理对象,采用增效结团流化床工艺进行了中试研究。试验结果表明,利用增效结团流化床工艺处理水库低浊水是切实可行的,具有系统运行稳定性高,出水水质好等特点,而良好的污泥回流是系统高效稳定运行的前提。控制上升流速为20m/h时,通过优化得出适宜的工艺参数:混凝剂聚氯化铝(PAC)投量为11 mg/L左右,助凝剂(PAM)投量为0.25～0.30mg/L,污泥回流比为3%,机械搅拌转速为6r/min。在此条件下,出水浊度可控制在1.0NTU以下。     

南京市城北污水处理厂工程设计

南京市城北污水处理厂设计规模30万m~3/d,其污水处理工艺采用一体化活性污泥法,污泥处理工艺采用浓缩脱水带式一体机,臭气处理采用分散收集、化学法集中除臭。介绍了工程设计参数、处理工艺流程及其设计特点。并详细阐述了除臭工艺流程及相关运行参数,净化后去除率达99.2％。     

给水厂污泥减量化及性能改善研究

随着给水厂排泥水直排河道的方法不再可行,水处理过程中产生的污泥量和污泥性能将直接影响整个水厂的造价及运行费用。试验在水处理工艺流程相同的条件下,分别投加硫酸铝、氯化铁、聚铝(PAC)、聚铁(PFS)、聚铝铁(PAFC)、高效聚双酸铝铁(PAFCS)等不同混凝剂,以达到减少絮凝沉淀后排泥水的污泥量及改善排泥水的沉降和脱水性能的效果,并探讨了其作用机理。     

低强度超声场促进剩余污泥好氧消化

为了提高剩余污泥好氧消化效率,在消化过程中对剩余污泥进行超声辐射,声强为0.53 W/cm2,频率28 kHz,分别选用0.045 W/mL、0.09 W/mL两个功率密度,每次超声辐射时间20 min或10 min,辐射频次选用4次或2次,组成4个组合.研究表明,未经超声处理的污泥在消化第17天达到稳定,而经超声作用的污泥消化稳定时间较前者提前3～7 d.在相同好氧消化时间内,经超声波处理后污泥能获得更高的有机物降解率.同时对超声波促进污泥好氧消化工艺进行了工程经济评价.