西安市典型污水厂污泥泥质分析及污泥处置方式研究

西安市近几年水污染综合整治力度不断增大,但已经建成的主城区9座污水处理厂所产生的污泥均未得到妥善的处置,污泥对环境造成的污染问题引起了社会的普遍关注。通过对西安市现状污水处理设施运行情况的调研,得到了西安市主城区现状污泥产量,并对西安市运行稳定的典型污水处理厂的污泥泥质进行了检测分析,从泥质分析角度得出了典型污水处理厂适宜采用的污泥处置方式,同时提出了西安市污泥处理处置设施的建设需综合考虑产泥量、污水厂的分布、污泥泥质及市场消纳量等多种因素。     

污水厂污泥处理处置工艺碳排放比较

本文对城镇污水厂污泥现行的主流处理和处置工艺碳排放量进行了比较分析,碳减排是未来污泥处理处置技术发展的重要方向,探讨了参与CDM机制的可行性。     

基于高压污泥压榨技术的污泥深度脱水系统及其应用

基于GB/T 23485-2009《城镇污水处理厂污泥处理混合填埋用泥质》对出厂填埋用泥含水率小于60%的规定,本文分析了目前国内污水厂已有的污泥处理技术的关键难点,阐述了以高压污泥压榨为主要工艺路线的污泥深度处理系统的优势,最后结合白马镇污水厂污泥深度处理项目的实例,为城镇污水厂突破污泥处置这一关键难点提供了切实可行的方案。     

高碑店污水处理厂污泥处置与利用的探讨

一、前言 城市污水处理厂每天排放大量污泥。据统计,一座二级污水处理厂所产生的污泥量约为总处理污水体积的0.3～0.5％。如进行深度处理,污泥量还可能进一步增加。对这些污泥必须及时处理与处置,以保证污水处理厂的正常运转和处理效果。 高碑店污水厂是一座日处理量100万吨的大型污水处理厂。日产含水率96％的消化污泥2643m~3,如此数量的污泥处置无疑将成为污水厂系统运行的一部分。 污泥的主要特性是有机物含量高,容易     

污泥脱水干化及协同焚烧研究

生活污水厂污泥处理一直制约着污水处理厂的长期运营和发展。将污水厂产生的初沉污泥及生化剩余污泥经调质剂进行污泥调质,然后进行高压压榨,将出来的含水率在50%以下泥饼运送至生活垃圾焚烧厂进行焚烧处置,减少了对环境的二次污染,最终实现污泥无害化、减量化、资源化的目的。     

浅述上海城市污水厂污泥在绿化中的应用

1上海市城市污水厂污泥处置现状目前,上海市中心城区有12座中小型污水处理厂,加上石洞口污水厂、竹园第一污水厂、白龙港污水处理厂等大型污水处理厂的建成投产,正常运行时的日污泥总量可达到600t多(以干固体计)。这仅是上海市水务局所辖范围内的污泥量,还不包括郊县污水厂所产生的污泥。庞大污泥量的处理处置是上海市面临的一个重要的环境问题。污泥处置近期还是以填埋为主,因为这是最经济的处置方法。在白龙港污水处理厂有43万m2的污泥专用填埋场用地,分两期实施,但是该填埋场的有效库容只有3～5年。在石洞口污水处理厂,污泥焚烧目前刚步…     

南宁市污水厂污泥最终处理处置设想

本文就南宁市污泥处理处置工作的现状及随着污水处理规模的发展趋势面临的问题,根据本地污泥特点,提出对南宁市污水厂污泥最终处理处置的一些设想.     

浅析我国城市污水厂污泥处置途径的选择

面对日益增长的环境污染,污水厂污泥处置成为社会重点关注的问题,本文论述的是我国污水厂对污泥处置途径的研究,如何科学开发污泥的使用价值,从而促进生态环境的和谐发展。     

城市污水厂污泥处置技术分析及福州市污泥处置的思考

本文对城市污水厂污泥处理处置主要技术进行分析,并阐述了国外污泥处置技术发展趋势,提出了污泥处理处置工作急需解决的问题。结合当前的污泥处置技术发展趋势,通过对福州市污水厂污泥处置现状及存在问题分析,提出了福州市今后的污泥处置技术路线:将厌氧消化做为有效减容、减量的手段,对污染物指标达到国家土地利用标准的污泥考虑土地利用,污染物指标不符合国家土地利用标准的污泥考虑焚烧和建材利用。     

现状污水处理厂污泥深度脱水系统设计

目前污泥妥善处理处置已纳入污水总量减排考核,要充分认识当前污泥处理处置工作的重要性和紧迫性,最终实现污泥"减量化、稳定化、无害化、资源化",加快推进污泥处理处置设施的建设。通过晋城市正源水务发展有限公司污泥脱水系统技术改造项目的设计实施,提出污泥干化技术在现状污水厂污泥系统改造技术的应用,为实现污泥处理处置提供条件。     

Thermochemical Treatment of Sewage Sludge

Technologies for the thermochemical treatment of sewage sludge are appraised with reference to their efficacy in terms of (a) operational parameters, (b) pre-and post-treatment requirements, and (c) the extent of their use for the application. Particular attention is given to the characteristics of the solid and gaseous products and how such characteristics affect post-treatment, reuse or disposal – this being dictated by environmental legislation.
Of specific interest is the off-gas treatment, which can contribute significantly to operating and capital costs of incineration. On the other hand, gasification and pyrolysis generate a combustible product for use in heat and/or power generation. Available information, although limited, suggests that gasification offers significant advantages over the conventional incineration process, yielding a combustible gaseous product (which can be directly utilised on site) and a solid char product (which is less prone to leaching of toxic metals).     

Thermal Drying of Sewage Sludge

Over the next decade the UK will experience significant, imposed changes in the quantity of sewage sludge produced and in the means available for its disposal. Existing practices are being reappraised and new technologies are being explored to cope with a predicted 40% increase in the quantity for disposal. Thermal drying of sludge undoubtedly has a role to play in coping with this demand.
The two principal process types, i.e. direct and indirect heat application, are appraised in depth and a comparison is drawn. A case study is identified to examine the energy demands of the process, including the potential for heat recovery and for resource reuse. The environmental impact of a typical process is also examined.     

Developments in Sewage Sludge Incineration

W ithin THE LAST few years there has been a resurgence of UK interest in incineration as a sludge disposal option. However, the last plant installed in the UK represented the technology and design thinking of the 1970s and there have been significant developments since that time. These are reviewed in this paper.
Especial attention is given to changes in legislation and attitudes concerning the environmental impact of incineration, and the effects on process selection. The wide range of options for the achievement of autothermic operation are itemized and a brief review of costs given.
It is considered likely that incineration will have an increased role in the future, though continuing to be rather specialized. Keeping an open mind on equipment selection is urged, as is the conduct of an organized programme of work to establish process design information before going out to tender.     

剩余污泥生态稳定化研究

利用中试规模的人工湿地对污泥进行了为期4 a的生态稳定化处理。系统占地80 m 2,填料层厚度为0.6 m,超高0.5 m,湿地植物选用芦苇。系统前2 a为污泥负荷期,后2 a自然稳定期。进泥TS、VS、含水率分别为平均22.34 g/L、7.76 g/L和97%,污泥负荷平均0.691 kg(TS）/m 2·d。在第1 a的系统调整期内,渗滤液COD去除率在60%～80%;而第2 aCOD去除率低于第1 a,为40％～50%;出水COD在100～200 mg/L之间。在负荷期内,随着运行时间的延长,也即随着污泥积存厚度的增加,渗滤液透过积泥层的时间变化不定,即渗滤液并非均匀下渗,而是部分渗滤液优先沿阻力最小的植物茎壁、根系以及积存污泥中大的孔隙向下流动。在第3 a和第4 a的自然稳定期内,污泥脱水较为充分,含水率分别降至平均34.3%和30.5%;污泥有机质含量分别降至平均16.8%和10.24%;稳定化污泥的全氮和全磷含量分别为平均0.98%和0.27%。对比发现,系统内植物量和植物营养成分都比野生植物高。     

水蚯蚓原位消解技术用于污泥减量的研究

采用水蚯蚓原位消解污泥技术对诸暨和浏阳市污水处理厂的三种工艺、四项工程进行改造,通过生产性试验考察了污泥减量效果以及对去除污染物的影响。结果表明,耦合后的工艺的污泥减量效果显著,其污泥产率最小为0.015 kg/m3,污泥减量可达81.7%,污泥的沉降性变好,MLVSS/MLSS值降至36.7%。系统工艺的耦合调整可使对COD的去除率增加8.9%,出水水质能稳定达到GB 18918—2002的一级B标准。同时,水蚯蚓原位消解污泥技术对于不同地区的水处理工艺均具有良好的适用性。     

污泥焚烧技术研究

污泥焚烧技术具有减量化、稳定化、无害化和资源化等优点,与其他传统污泥处理方法相比,被各国认为是污泥处理效果最佳、最经济实用的工艺之一。详细阐述了污泥焚烧技术的发展现状、原理、影响因素,并提出了污泥发展技术未来的研究方向。     

UK Developments in Sewage Sludge Processing

A considerable amount of research and development has been undertaken in the UK during the last 25–30 years in the field of sewage sludge processing. The research has been sponsored mainly by the water utilities with the objective of improving process efficiency and reliability and reducing costs. Government-funded research has focused mainly on the environmental aspects of sludge disposal to land and to the sea.
Finding ways of reducing sludge production has proved difficult, but one new method of sewage treatment has some advantages in this respect.
Arising from the research on sludge processing, (a) new methods of characterization of sludge have been developed, (b) an improved method for the design and operation of gravity thickeners has been successfully implemented, (c) advances have been made in the process of heated anaerobic digestion, and (d) an effective system for aerobic thermophilic digestion of sludge at small works has been established. A new method for measuring sludge filtrability – the PFT meter – has been developed, and the economics of flocculation have been improved by the introduction of a new type of mixer. An improved method for controlling the operation of filter presses is now available.
The problems of odour nuisance from sludge operations may now be controlled using biological systems to treat odorous air.     

Developments in the Thermal Drying of Sewage Sludge

The application of heat to dried sewage sludge has been practised by the water industry for many years. Early technologies were effective but their utilization of energy was not so efficient. Other industries have faced up to this problem and, as a result, have developed thermal-drying techniques which are more efficient and therefore more cost effective. In recent years, the transfer of this technology to sewage-sludge drying has been taking place, and some companies have designed dryers specifically for this purpose. Commercial and legal pressures have also focused attention on the final product and its use in agriculture, horticulture, land reclamation, landfill, incineration, and as a substitute for fuel.
This paper reviews the work which has been undertaken to determine the changes which occur as sewage sludge is dried, and discusses the technology which is available at present. Factors influencing capital and operating costs and product choice are also included.     

Incineration of Sewage Sludge - A Reappraisal

T he paper briefly reviews the history of incineration in the UK. The need for an integrated flow sheet concept in the design and operation of modern incinerators is stressed. Each element of the flow sheet (dewatering, predrying, the incinerator, waste heat recovery, flue gas cleaning, ash disposal) is reviewed. The economics of the process are discussed and the importance of autogenous combustion and need to avoid the inclusion of spare capacity is emphasised.