某污水厂污泥处理系统改造工程设计总结与反思

基于焚烧的污泥含水率应小于50%之要求,采用污泥深度脱水技术对连江县污水处理厂原有污泥处理系统进行改造。文章总结并反思了改造工程设计,并提出今后设计上的改进和解决思路。     

基于厢式隔膜压滤机的污泥深度脱水工艺

进入垃圾填埋场填埋的污水处理厂污泥含水率应<60%。为实现这一国家标准,基于厢式隔膜压滤机的污泥深度脱水工艺得到了推广应用。根据相关设备考察和工程设计经验,对污泥深度脱水工艺的调质、进料、压滤机、滤布和气源等系统进行了分析,并介绍了设备选型的注意事项,可供工程设计和设备采购参考。     

增城市荔城污水处理厂二期扩建工程

荔城污水处理厂设计规模为10万m3/d,已建一期工程为5万m3/d,二期扩建工程为5万m3/d,污水处理工艺采用脱氮除磷效果较好的CAST工艺;污泥处理采用机械浓缩加机械脱水一体化的污泥处理方式。介绍了污水处理厂扩建工程的处理工艺流程、工程设计参数、设备配置情况等。     

无锡市惠山污水处理厂污泥深度脱水工程设计

为拓宽无锡市惠山污水处理厂污泥的出路,满足污泥混合填埋含水率不大于60%的要求,统筹污水处理厂全厂的污泥处理,采用隔膜式板框压滤机作为核心脱水设备的污泥深度脱水工艺,配合污泥的化学调理,能将出泥含水率控制在60%以下。简要介绍了各工段的设计参数,并对传统的处理流程进行优化,最后对运行费用进行分析。该成果对于后续科研和设计工作具有一定的参考价值。     

泰宁县污水处理厂工程处理工艺设计特点

介绍了泰宁县污水处理厂工程设计水质及工艺流程、工程工艺设计的特点。具体叙述采用的改进型四沟式氧化沟新工艺对污水进行二级生化处理的应用及其出水系统设计;采用气水反冲洗滤池工艺对二级出水进行三级深度处理;采用紫外线消毒;采用机械浓缩脱水一体机进行污泥处理的工艺等。     

污泥离心脱水系统改造为离心浓缩系统的实践

为了满足国家对填埋污泥含水率的新要求,国内许多将污泥离心脱水后外运填埋的污水处理厂将需要考虑污泥离心脱水设备的替换。为了合理利用现有的离心脱水成套设备、有效降低污水处理厂的设备改建成本,在上海某污水处理厂进行了设备改造实践,通过更新升级控制系统,将原有的污泥离心脱水系统改造为离心浓缩系统,以继续发挥离心机的优势,同时为污泥的进一步深度处理做准备。现场测试结果表明,改造后的污泥离心浓缩成套系统基本达到了预期效果,这为其他类似污水处理厂的离心脱水设备改造提供了技术参考,使离心机在污水处理中的应用得到了一定的扩展。     

市政污水处理厂招标中污泥脱水设备的选择探讨

我国城市化进程的不断加快使得市政污水处理厂的相关规划逐渐成为市政工程规划中的一项重要内容。由于污水处理厂在进行污水处理时所产生污泥具有产量大、含水率高、气味特殊等特点,因此应对相关的污泥脱水设备进行合理的选择,以保证污泥脱水工作顺利进行。这里将结合实际情况对市政污水处理厂招标过程中污泥脱水设备的选择进行分析,旨在有效推动我国城市化进程。     

污泥浓缩脱水一体化技术应用探讨

传统的污泥浓缩脱水工艺存在着占地大、投资多、管理复杂、污泥容易流失、除磷效果差的缺陷,严重地影响看污水处理厂建设的良性发展。提出了污泥浓缩脱水一体化技术在污水处理厂中的应用,并就其基本原理和技术特点进行了阐述。为污水处理厂污染工艺选择提供了一种新的思路。对加快污水处理厂建设,提高出水标准,保护环境起到积极的作用。     

上海青浦污水处理厂污泥好氧发酵新技术应用

对上海市青浦区城镇污水处理厂污泥工程设计进行了介绍,包括污泥量的估算、污泥处置出路的选择、污泥处理工艺确定及工程经济技术指标等。经比选后,青浦区城镇污水处理厂污泥主要处置方式为园林绿化用土。污泥处理方法采用好氧发酵处理工艺。最后具体介绍了工程设计,包括物料流程和配套设备。     

西安市第四污水处理厂三期工程工艺设计介绍

西安市第四污水处理厂三期工程设计规模为12.5×10~4 m~3/d,污水处理采用改良A_2/O工艺,出水执行GB 18918—2002《城镇污水处理厂污染物排放标准》中的一级A标准,污泥处理采用化学调理、高压隔膜压滤脱水工艺。详细介绍了该工程的设计进、出水水质指标及主要建构筑物的工艺设计参数和工艺设计特点。     

污泥干化焚烧处理工艺和设计要点

污泥已成为影响城市发展的重要环境问题之一。为达到减量化、稳定化、无害化、资源化的目标,对于大量污泥来说,焚烧兼具彻底稳定化和减量化双重功能。污泥干化焚烧处理工艺主要由干化系统、焚烧系统和烟气净化系统组成。着重介绍了污泥干化焚烧工艺中的设计要点。     

绍兴污水处理厂污泥处理工程改扩建设计

介绍了绍兴污水处理厂污泥处理工程的改扩建设计,设计中对现有污泥处理脱水构筑物及设备进行了改造,解决了其污泥脱水性能较差的问题,充分发挥了现有设施的处理能力,污泥预处理能力达到350 tDS/d(83%含水率污泥为2 059t/d),新建处理能力为370 tDS/d(80%含水率污泥为1 850t/d)的污泥处理设施,全厂污泥全部处理后外运处置.     

Effects and modelling of ultrasonic waste‐activated sludge disintegration

Sonication is a well‐known sludge pretreatment technique with the advantages of simple operation and high efficiency. However, it is an energy‐intensive process. Hence, it is very important to predetermine its sludge disintegration efficiency at varying pretreatment conditions in order to minimize the ultrasonic energy consumption. In this study, it was found that the ultrasonic sludge disintegration occurred in two stages: rapid and subsequent slow disintegration stages. For this reason, it was aimed to develop a simple and accurate mathematical model to describe the two‐stage sludge disintegration as a function of pretreatment conditions. Sludge concentration and ultrasonic density along with sonication period were involved in this model as independent variables. It was determined that the mathematical model can predict accurately the degree of sludge disintegration. Thus, the proposed model was seen to be very useful for evaluating the disintegration efficiency and/or for process design using the operating parameters under different conditions.     

SLUDGE TREATMENT AND DRYING REED BED SYSTEMS IN DENMARK

Sludge Reed beds have been used for dewatering (draining and evapotranspiration) and mineralisation of sludge in Denmark since 1988 when the first sludge processing system was introduced. Sludge from wastewater treatment plants (2,500-125,000 pe) is treated in sludge reed bed systems with 1–18 basins with loading rates of 25–2,200 tonnes dry solids/year for ten years. In 2002, approximately 95 systems were in operation. Dimensioning and design of reed bed systems depends on the sludge production rate, sludge type, quality and regional climate.
The maximum sludge loading rate is approximately 50–60 kg DS/m²/year. Loading cycles are related to the sludge type and the age of the sludge reed systems. The sludge residue will, after approximately ten years of operation, reach an approximate height of 1.2–1.5 metres with dry solids content of 30–40%. Experience has shown that the quality of the final product with respect to heavy metals, hazardous organic compounds and pathogen removal after ten years of treatment make it possible to recycle the biosolids to agriculture as an enhanced treated product.     

印染废水处理中的污泥膨胀与控制

分析了水解酸化／UASB／SBR工艺处理印染废水过程中发生污泥膨胀的可能原因，并通过试验考察了投加氮和磷与预曝气对污泥膨胀的控制效果。结果发现只投加氮、磷未能控制污泥膨胀，而预曝气则可使污泥膨胀得到很好的控制。结合水质分析的结果，得知污泥膨胀的原因是硫化物浓度过高。     

Progress and perspectives of sludge ozonation as a powerful pretreatment method for minimization of excess sludge production

The treatment and disposal of excess sludge represents a bottleneck in wastewater treatment plants (WWTP) worldwide, due to environmental, economic, social and legal factors. The ideal solution to the problem of sludge disposal is to combine sludge reduction with the removal of pollution at the source. This paper presents an overview of the potential of ozonation in sludge reduction. The full-scale application of ozonation in excess sludge reduction is presented. Improvements in the biodegradability of the ozonated sludge were confirmed. The introduction of ozonation into activated sludge did not significantly influence effluent quality but improved the settling properties of the sludge. An operation with a suitable sludge wasting ratio seems to be necessary to prevent accumulation of inorganic and inert particles for long-term operation. Sludge ozonation to reduce excess sludge production may be economical in WWTP which have high sludge disposal costs and operational problems such as sludge foaming and bulking. The recommended ozone dose ranges from 0.03 to 0.05 g O₃/g TSS, which is appropriate to achieve a balance between sludge reduction efficiency and cost. An effort to design and optimize an economic sludge reduction process is necessary.     

上海城市污水厂污泥的农用处置方法研究

历时一年的调查显示，上海11家城市污水厂的污泥中含有大量的植物养分，但是在某些时期重金属含量会超过国家《农用污泥质量标准》，为此采用生物法和化学法对污泥中的重金属进行了沥滤试验。沥滤7d后的结果表明，采用生物法双用浓H2SO4酸化具更好的滤除效果；在生物法沥滤重金属的过程中还具有酸化法所没有的泥消化功能。     

Stability and maturity of thickened wastewater sludge treated in pilot-scale sludge treatment wetlands

Thickened wastewater activated sludge was treated in 13 pilot-scale sludge treatment wetlands of various configurations that operated continuously for three years in North Greece. Sludge was loaded for approximately 2.5 years, and the beds were left to rest for the remaining period. Three different sludge loading rates were used that represented three different population equivalents. Residual sludge stability and maturity were monitored for the last year. Sludge was regularly sampled and microbial respiration activity indices were measured via a static respiration assay. The phytotoxicity of sludge was quantified via a seed germination bioassay. Measurements of total solids, organic matter, total coliforms, pH and electrical conductivity were also made. According to microbial respiration activity measurements, the sludge end-product was classified as stable. The germination index of the final product exceeded 100% in most wetland units, while final pH values were approximately 6.5. The presence of plants positively affected the stability and maturity of the residual sludge end-product. Passive aeration did not significantly affect the quality of the residual sludge, while the addition of chromium at high concentrations hindered the sludge decomposition process. Conclusively, sludge treatment wetlands can be successfully used, not only to dewater, but also to stabilize and mature wastewater sludge after approximately a four-month resting phase.     

多点交替进水五箱一体式工艺污泥回流比研究

介绍了多点交替进水五箱一体式工艺的流程与特点，研究了不同污泥回流比下反应器对氮、磷的去除效果。结果表明，在运行周期为16h、污泥回流比为55％的条件下，反应器对COD、BOD5、NH4^＋-N、TN、TP的去除率分别达到78％、84％、86％、70％、89％。此外，建立了反应池内污泥浓度的分布模型，并计算得出不同回流比下污泥浓度的变化规律，通过对计算值与试验检测结果的比较，提出了后期工艺的改进方向。     

城市污泥堆肥处理及其产业化发展中的几个关键问题

污泥堆肥处理后其有机质和N、P等营养元素可被农作物利用,促进作物增产,被认为是适合中国国情的污泥处理与处置方式.但受处理技术水平、人们的认知和可接受程度的限制以及国家政策法规、产品出路等问题的困扰,城市污泥堆肥处理及其产业化过程仍面临诸多不利因素.为从根本上解决城市污泥的处理与处置难题,城市污泥堆肥处理及其产业化过程中存在的问题必须予以解决,以加快其产业化进程.