叠氏污泥脱水技术处理炼油厂“三泥”

分析了炼油厂“三泥”性质和脱水预处理对策,介绍了叠氏污泥脱水机特点原理及处理炼油企业“三泥”的典型应用实例.当处理罐底泥时,进料含水率在86.7％～90.2％时,经叠氏污泥脱水机脱水后泥饼含水率降为54.2％～55.9％;当处理剩余活性污泥时,进料含水率在95.5％～97.5％时,经叠氏污泥脱水机脱水后泥饼含水率降为78.0％～79.0％;当处理浮渣时,进料含水率在90.5％～92.0％时,经叠氏污泥脱水机脱水后泥饼含水率降为67.9％～68.7％.所处理物料的脱水泥饼的含水率均低于80％,满足污泥迸一步处理前的脱水需求,与离心机相比节电在1/10以上.     

污泥深度脱水分析和全自动压滤机应用实践

从过滤速率方程可见，影响污泥深度脱水的主要因素有污泥性质(r、μ)、压力、泥饼厚度和时间。通过污泥调理、增加压力、降低泥饼厚度可以改善污泥的脱水效率和脱水后泥饼含水率，但要同时考虑经济性、安全性和污泥减量化、稳定化、无害化和资源化的需要。滤布行走式全自动压滤机，可以实现无人辅助卸泥全自动运行，单一调理剂聚合硫酸铁有效投加量占绝干污泥的比例为1.47%～2.1%,泥饼含水率50.15%～53.45%。     

活性炭联合正弦波电场促进污泥脱水

利用活性炭联合正弦波电场促进污泥脱水,通过对泥饼电流、温度及泥饼、滤液的性质分析探究活性炭对污泥脱水的促进机理。结果表明,活性炭可以提升污泥导电性,增强污泥中的电化学反应,从而降低了泥饼含水率。在占空比为100%,投加量为5%污泥干重时,泥饼含水率为43%;活性炭可以吸附滤液中有机物组分,相比未投加,投加5%活性炭的总有机碳值降低了1.708g/L,降低了滤液处理成本。     

叠螺式脱水机在含油污泥脱水中的应用

为了确定伊拉克某油田污水处理站含油污泥处理设备,对比分析了板框式压滤机、带式压滤机、离心式脱水机和叠螺式脱水机等常用含油污泥机械脱水设备的技术特点和应用范围,并对叠螺式脱水机实际运行情况进行了现场调研。分析和现场调研结果表明,叠螺式脱水机集污泥浓缩和脱水于一体,具有出泥含水率低、占地面积小、易分离、不堵塞,可以实现自清洗,可用于低浓度污泥等特点,叠螺式脱水机简化了油田污泥处理工艺流程,降低了地面工程建设投资及运行成本,是含油污泥进行脱水的较好选择。介绍了伊拉克某油田污水处理站含油污泥叠螺式脱水机的选型设计。     

聚丙烯酸絮凝剂在印染污泥低温热处理中的应用

污泥脱水是实现污泥减量化和资源化利用的关键步骤。研究了自制聚丙烯酸絮凝剂PR在低温热处理条件下对印染污泥脱水性能的影响,探究其脱水机理。结果表明,PR能显著改善污泥的脱水性能。最佳工艺条件:PR用量15 mg/g,硫酸用量0.002 mL/g,75℃下热处理30 min。处理后污泥比阻降至2.80×10~(12) m/kg,降低了98.80%,泥饼含水率降至84.59%,结合水含量降至28.27%。     

湛江某再生水厂低影响污泥系统扩容改造分析

由于湛江市某再生水厂处理水量提高,其产生的污泥量由干泥量14 t DS/d提高至16.6 t DS/d,超过原有污泥脱水系统的处理能力.该工程在保留及利用原有脱水机、投药设备等的基础上,新增了污泥机械浓缩设备及其配套的进出料系统、PAM药剂投加系统,将原污泥脱水系统的进泥含水率由99.2％降低至97％,并新增污泥离心脱水机.在尽量降低对现况系统的影响下,提高原有污泥系统处理能力,为其他污水处理厂的扩容升级提供了借鉴和参考.     

煤直接液化项目污泥处理工艺应用与探讨

针对煤直接液化污水处理场含油污泥、浮渣、盐泥、煤粉等混合污泥,采用污泥浓缩、离心脱水、污泥干化等技术,将污泥含水率从99%处理至15%,后进行无害化处置。详细介绍了污泥干化系统的工艺设备,并对污泥干化的经济效益进行了分析,对存在问题进行了探讨与改进。整套污泥处置工艺在煤直接液化污水处理场应用非常成功,显示出了良好的经济效益,起到了示范作用。     

PAC与铁盐对污泥深度脱水性能的对比研究

在工业废水和生活污水的处理过程中,会产生大量的污泥。污泥中水分含量达到95%~99%,只要将其中的水分去除.就会大大缩小污泥的体积,以便于进一步处理。文章还通过试验从污泥比阻和泥饼含水率两个方面比较四种加药方案(PAC、PFC、FC和PFS)的脱水效果,四种加药方案各有优点。FC、PFC的脱水效果最佳,在投药量为干污泥的21%以上时,泥饼含水率可降至60%以下;PFS和PAC的效果次之。     

污泥低温真空脱水干化成套技术的设计探讨

随着我国经济技术不断发展,污泥处置将从传统的卫生填埋向污泥干化焚烧或资源化利用方向发展。低温真空脱水干化成套设备采用低温真空干化原理,可以一次性将污泥的含水率从98%左右脱水干化至30%~40%,为后续的焚烧或资源化利用创造了条件。池州市前江工业园污水处理厂通过引进该项技术,实现了在一套设备内干化污泥的目的,出泥含水率小于40%。     

某污水厂污泥低温干化处理工艺设计及运行总结

随着城市的发展，污水量的增加，市政污泥产量越来越大，污泥的处理已经成为影响到城市发展的重要环境问题之一。某污水厂采用离心脱水+低温干化工艺，实现了污泥含水率从97%～98.5%降到含水率30%～40%(含水率可调)。处理后的污泥运至发电厂进行掺烧。实现污泥的减量化、稳定化，无害化、资源化。污泥低温干化工艺主要由污泥脱水系统、污泥低温干化系统、污泥储运系统、冷却循环系统、除臭系统组成。本文主要介绍整个系统工艺设计及其运行情况总结。     

超声能量密度对污泥脱水性能的影响

<正>引言近年来,生物法在城市污水处理中得到广泛的应用,然而在处理过程中产生了大量的污泥,污泥中含有50%～70%的有机物和较多的氮、磷等营养成分以及致病菌、寄生虫卵等有害物质。其化学     

阴极滤布对活性污泥电渗透脱水的影响(英文)

The mechanical dewatering of activated sludge is troublesome due to its high compressibility of solids. The dewatering can be enhanced dramatically by the use of electroosmosis,in which an electric field is applied to the sludge cake.In this study,the influence of filter cloth on the cathode on the dewatering of activated sludge was investigated.It was found that thicker filter cloth led to lower water removal from the sludge cake,so a stainless steel cathode net with small pore size instead of filter cloth was applied,which improves the dewatering efficiency and reduces the electric power consumption.Moreover,water absorbent materials were helpful to remove the water from the sludge cake.For the electroosmotic dewatering at 7 kPa and 24 V·cm-1,the water content in the sludge cake decreased to 60%(by mass) with the average 0.075 kW·h·kg-1of water removed by using the cathode net.     

A study of the improvement in dewatering behavior of wastewater sludge through the addition of fly ash

Wastewater sludge is classified as a difficult dewatering material (DDM) due to the high cake specific resistance (CSR). On the other hand, fly ash is classified as an easy dewatering material (EDM), which suggests that it might be able to improve the dewaterability of wastewater sludge. The water content and cake specific resistance of dewatered sludge without the addition of fly ash were 80% and 2.9×10¹⁴ kg/m, respectively. When 50% (by dry weight) fly ash was added to the sludge, the water content and cake specific resistance decreased to 29.4% and 2.9×10¹³ kg/m, respectively. The cake specific resistance and water content decreased with increasing fly ash additions. Therefore, the production of sludge cake can be reduced by adding fly ash, which can help minimize the social and environmental problems caused by the need to dispose of wastewater sludge.     

叠螺脱水机与离心脱水机在污泥处理中的应用比较

阐述了炼油厂污泥的来源及特性,从工作原理、工艺流程和运行成本3方面对叠螺脱水机与离心脱水机进行了比较分析。2种污泥脱水机均适用于含油污泥(主要成分是浮渣)、剩余活性污泥的脱水处理;离心脱水机主要是依靠转鼓高转速产生的离心力使具有一定密度差的泥水分离,而叠螺脱水机主要是依靠螺杆的挤压来实现污泥脱水;离心脱水机必须配套污泥输送泵、比重剂加药设备;叠螺脱水机在运行成本上占有明显优势,还可以显著改善运行中对工作环境的污染。基于叠螺脱水机运用螺杆挤压原理实现污泥脱水,该设备不适用于含较大硬度颗粒的污泥脱水。     

电渗透/Fe-过硫酸盐氧化协同强化污泥深度脱水

利用电渗透和高级氧化技术,采用自制实验装置对城市污水处理厂的脱水污泥进行了脱水研究,系统研究了过硫酸盐投加量、铁盐与过硫酸盐比例、电压梯度、脱水时间和污泥厚度对污泥脱水的影响。结果表明,电渗透-高级氧化复合技术可以改善污泥的脱水性能,在污泥样品为140 g、过硫酸盐投加量为100（mg·g DS）^-1、Fe²⁺与过硫酸盐比例为1：1、机械压力为17.59 kPa、控制初始电压为11 V·cm^-1时,污泥的含水率可以降低至60%以下,与单独使用电渗透技术相比,泥饼具有更好的均匀性,便于后续的运输和安置。     

高盐高有机制药废水污泥电渗透高干脱水

为研究高盐高有机制药废水污泥的电渗透脱水效果,深入认识化学污泥的电脱水过程,本文采用电渗透高干脱水技术对经抽滤脱水的高盐高有机制药废水化学污泥进行深度脱水,考察了泥饼初始pH的改变对污泥电渗透高干脱水过程中阴阳极污泥的含水率、电流、电导率、pH、zeta电位与能耗的影响,验证了对高盐高有机制药废水污泥实行电渗透高干脱水的可行性,解析了化学污泥电渗透脱水过程的机制。结果表明,泥饼pH为2、3、4时,zeta电位为正值,电渗流反向流动,无法脱水;pH增至5时,zeta电位为负值,电渗流从阴极脱除,污泥含水率从53.2%降至44.8%,脱水效果最好;但pH增至6时,脱水量有所降低。污泥电导率随pH的增加而降低。pH为5时初始电流最大。脱水15min时,即污泥含水率降至45.5%时,能源利用率最高。     

Improvement of sludge electrodewatering by anode flushing

An improvement of the sludge electrodewatering process is proposed: anode flushing by filtrate recirculation. According to this technique, the mixture of filtrates obtained at cathode and anode sides is used for continuous flushing of the anode chamber of the filter press during electrodewatering. Anode flushing aims to eliminate essential problems of electrodewatering: ohmic heating, rise of electric energy consumption, electrode corrosion, and filtrate contamination. This is attained by better control of the filtrate pH, the filter cake temperature, and the dryness at the anode side, where the physicochemical conditions are most aggressive. The efficiency of the proposed technique is evaluated at lab scale on drilling sludge electrodewatering with and without anode flushing. In experiments without anode flushing, increasing electric current density caused strong increase of anode temperature, desiccation of the filter cake at the anode side, rise of voltage, and significant alkaline contamination of filtrate. The application of anode flushing allowed controlling the electric field strength and temperature. Thus, the dewatering of the sludge has been extended at high electric field without damaging the filter equipment by drastic heating. Furthermore, it reduced filtrate contamination by neutralization of the electrolysis products.     

Sewage Sludge Dewatering Process Using Liquefied Dimethyl Ether as Solid Fuel

This article describes the dewatering of sewage sludge using liquefied dimethyl ether (DME), which clarified the effect of sludge type and its particle size. Changes in the heating value of the dewatered sludge were also examined. In addition, the change in dewaterability upon reuse of the liquefied DME was investigated experimentally.

Regardless of the nature of the sludge, its dewatering behavior was similar. The amount of dewatered water could be increased by decreasing the diameter of the sludge cake. Complete drying of the sludge cake via DME dewatering resulted in retention of approximately 96% of the heating value (17.7 MJ/kg-sludge) of the original sludge cake dry base (18.4 MJ/kg db). The DME could be recovered after extraction, and reuse experiments showed that liquefied DME dewatering performance was unchanged after five reuses.     

超声波-复合絮凝剂对石化厂剩余污泥脱水的研究

以污泥含水率为考察指标,研究了超声波-复合絮凝剂对石化厂剩余污泥脱水效果的影响.实验结果表明,复合絮凝剂的脱水效果优于单一絮凝剂;污泥采用复合絮凝剂PAM-PAFC进行絮凝脱水,在投加质量浓度190 mg/L、m(PAM)∶m(PAFC)=1∶1条件下,再经20 kHz、400 W/m2超声处理2.5 min后,污泥含水率从97%降至79%,污泥体积缩小86%左右,比仅投加PAM处理时污泥含水率降低5%左右.可见,超声波-复合絮凝剂可以强化污泥脱水,在提高污泥脱水效果的同时,减少了有机絮凝剂PAM的用量,降低了污泥处理成本.     

沸石强化生物A/O工艺污泥脱水性能研究

沸石在强化A／O生物脱氮效果的同时改善了污泥的脱水性能。含沸石污泥的比阻随沸石含量的增加而降低,当沸石质量浓度在4g／L时,污泥脱水后体积变化梯度大。综合比较表明,含沸石污泥不投加混凝剂而直接脱水是适宜的。