生活工业混合污水处理厂的自控系统

该文介绍了生活工业混合污水处理厂的自控系统,该系统安全可靠、技术先进、维护使用方便.     

开封市西区污水处理厂自控系统介绍

开封市西区污水处理厂是河南省第一批利用外国政府贷款兴建的污水处理工程。对该厂自控系统的组成、工艺操作模式及其运行结果进行了介绍 ,并结合实践 ,谈了一些工作体会     

浙江省东阳市某污水处理厂自控系统介绍

根据某污水处理厂的工艺特点 ,设计了一套计算机控制系统 ,采用了先进的控制策略进行pH的区间控制 ,从而降低了生产成本。目前该处理厂已经能经济可靠地运行 ,处理后污水达到了国家标准     

东莞市市区污水处理厂一期自控系统简介

通过Profibus-DP实现工业控制网络的连接,数字数据网专线实现远程泵站的监控,100Mbit/s以太局域网实现上位机服务器/客户机的连接,使污水处理厂实现对各设备的状态以及水量、水质的监视与控制等管理功能。并可通过Internet联网实现远程监控,异地办公。     

卢沟桥污水处理厂生化系统自控运行的探索与研究

对北京卢沟桥污水处理厂生化系统三年多的自控运行中出现的问题进行探索和研究,并提出可行的解决措施.同时,对生化系统手动运行和自控运行的效果和成本进行了对比统计和分析,结果表明,生化系统自控运行模式下出水水质稳定达标,运行成本经济.     

现代智能建筑中的空调设备自控系统

随着以计算机技术、信息技术为基础的自动控制系统在现代建筑领域的广泛应用,由空调设备自控系统、电器设备自控系统和消防设备自控系统构成的楼宇自控系统代替人员操作管理方式,成为现代智能建筑管理的一种发展趋势。文章着重介绍了空调设备自控系统的主要功能、设备以及应用实例。     

生物除臭系统在污水处理厂中的应用——以武汉市落步嘴污水处理厂为例

1．工程概况 落步嘴污水处理厂位于武汉市青山区洪山乡苏家嘴村的规划用地范围内，紧临新建的武汉火车站，近期规模为12万m^3／d，远期总规模为24万m^3／d，厂区近期控制占地面积约9．172公顷，远期总占地面积约6．793公顷。污水处理工艺为厌氧氧化沟工艺，二级污水处理。污水处理过程中产生的臭气经生物除臭系统处理后的排放气体符合《城镇污水处理厂污染物排放标准》（0818918—2002）中规定的二级标准。     

污水处理厂管理工作的探索

污水处理工作,对环境改善,招商引资,旅游业发展,人民生活水平提高有着十分重要的影响。在新的时期,做好污水厂运行管理工作,提高服务水平是适应市场经济发展的要求;是保护环境、清除污染、保证城市社会经济可持续发展的要求。     

墨西哥城的污水处理厂

简要介绍了墨西哥城几个污水处理厂的工艺流程、处理设备及构筑物的特点 ,及其处理的效果     

Automatic control and remote monitoring system for biological nutrient removal on small wastewater treatment plants in Korea.

Many small-size wastewater treatment plants in Korea's rural communities are designed to remove organic and suspended matter only, and they generally show a large fluctuation in the influent loading compared to municipal wastewater treatment plants (MWWTPs). They also have no professional engineers stationed for efficient operation against mechanical breakdown. For those reasons, the wastewater treatment plants have low efficiency in treatment of nitrogen and phosphorus as well as organic matter. In order to solve those problems, this study developed an automatic control system and RMS (remote monitoring system), which can keep efficiency stable despite any change in the small plants' loading rates and are capable of removing nutrient materials such as nitrogen or phosphorus. According to the results of the Experimental SBR system of the automatic control program, complete nitrification was made under oxic conditions and denitrification occurred as NO3-N concentration decreased by 0.5 mg/l in anoxic conditions and excellent nitrogen removal efficiency was seen generally. The Experimental SBR system created "phosphate release and uptake" effectively and displayed phosphate-removing efficiency up to more than 80% as the concentration of effluent was kept low by 0.4 mg/l. RMS developed in this study transmits a plant's data and operation states to clients in remote locations in real-time interval through the Internet. Therefore, although you are in a remote location, it allows you to see if a plant is properly operated or there is any breakdown.     

Dynamic monitoring system for full-scale wastewater treatment plants.

This paper proposes a new process monitoring method using dynamic independent component analysis (ICA), ICA is a recently developed technique to extract the hidden factors that underlie sets of measurements, whereas principal component analysis (PCA) is a dimensionality reduction technique in terms of capturing the variance of the data. Its goal is to find a linear representation of non-Gaussian data so that the components are statistically independent. PCA aims at finding PCs that are uncorrelated and are linear combinations of the observed variables, while ICA is designed to separate the ICs that are independent and constitute the observed variables. The dynamic ICA monitoring method is applying ICA to the augmenting matrix with time-lagged variables. The dynamic monitoring method was applied to detect and monitor disturbances in a full-scale biological wastewater treatment (WWTP), which is characterized by a variety of dynamic and non-Gaussian characteristics. The dynamic ICA method showed more powerful monitoring performance on a WWTP application than the dynamic PCA method since it can extract source signals which are independent of time and cross-correlation of variables.     

Disturbance detection in wastewater treatment plants

The development in sensor technology has made many wastewater treatment systems data rich but not necessarily information rich. To extract the adequate information from several sensors is not trivial, and it is not sufficient to consider only the time series. Different tools for detecting unusual on-line measurement data and deviating process behaviour are discussed. In this paper various dimension reduction as well as advanced filtering methods are considered in order to extract adequate information for fault detection and diagnosis. Both the operator and the process engineer can take advantage of such methods for proper monitoring of the plant, in particular extreme events and their causes.     

PHA-accumulating microorganisms in full-scale wastewater treatment plants

A study was conducted to clarify phylogenetic affiliations of polyhydroxyalkanoate (PHA)-accumulating microorganisms in full-scale activated sludge processes. Activated sludge samples obtained from three full-scale activated sludge processes were aerobically incubated with excess acetate to increase their PHA content. The buoyant density separation method was applied to selectively collect PHA-accumulating cells, which were then analysed by the group-level FISH and the PCR-DGGE-sequencing methods, and possible PHA-accumulating microbial groups were screened. A set of oligonucleotide probes targeting the microbial groups suspected to accumulate PHA was introduced, and seven oligonucleotide probes were newly designed for this purpose. PHA accumulation of probe-positive cells was confirmed by the post-FISH PHA staining method, wherein PHA staining with Nile Blue A (NBA) was applied after FISH. As a result, the following seven bacterial groups were found to have PHA: Dechloromonas, Accumulibacter, Thauera, Zoogloea, Comamonas, Competibacter and a novel cluster in Beta-proteobacteria. Based on the results of the post-FISH PHA staining method, these seven bacterial groups were estimated to account for around four-tenths to two-thirds of total PHA-accumulating microorganisms.     

德国污水处理厂水质状况介绍

介绍了2004年德国污水处理厂数量和规模情况,以及污水处理厂的进出水水质状况,出水水质等级划分标准和实际污染物排放的统计结果。为我国降低污染物排放浓度,提高污水处理效率提供参考。     

Nitrogen removal in multi-stage wastewater treatment plants by using a modified post-denitrification system

Systems in which denitrification follows nitrification (post-denitrification) copy the natural sequence of nitrogen removal. The disadvantage of post-denitrification, however, is that an external carbon source must be added to the denitrification reactor. In the concept discussed in this paper, excess sludge from a high loaded activated sludge plant is used as carbon source and as source of denitrifiers in a three-stage system. The sludge is fed into a anoxic reactor placed in between the nitrification reactor (e.g., trickling filter) and the final clarifier. Two different operation methods were investigated at a pilot-scale system set up at the Ingolstadt wastewater treatment plant Low nitrate effluent values were obtained at high sludge feeding rates, but at the expense of a significant increase in turbidity and NH4-N effluent concentrations. This problem could be solved by a reduction of the sludge feeding rate and by applying intermittent feeding. The effluent turbidity was kept at an acceptable level, but denitrification was relatively slow in progress. To achieve both low effluent turbidity and low nitrate discharge, a combination of pre- and post-denitrification is recommended.     

Performance indicators for wastewater treatment plants

The Swedish Water & Wastewater Association has operated a web-based system, VASS, for the collection and compilation of key data from the Swedish water utilities since 2003. The VASS system will now be expanded to include data on operation of individual wastewater treatment plants (WWTP). The objective is to provide performance indicators (PIs) for performance and economy and the use of resources such as energy, chemicals and manpower. A set of PIs has been developed that also includes explanatory factors to compensate for differences in the condition of operation between plants. This paper discusses the data required for the calculation of PI but also for explanatory factors, quality checks and for plant operation context. The discussion is based on the experiences from a test round with the participation of 24 WWTP.     

Tertiary filtration in small wastewater treatment plants.

Tertiary filtration can be proposed in small wastewater treatment plants with impact on protected water bodies. Rotating disk filters may be adopted, in respect to conventional sand filters, when low availability of space and low investment costs are the prevailing conditions. The overall objective of this research was to evaluate the filtration efficiency of rotating disk filters; to compare effectiveness with traditional sand filters; to analyse thoroughly the importance of particle size distribution in wastewater tertiary filtration. In the experimental activity, conventional wastewater quality parameters were investigated and particle size distribution (PSD) was characterized to discuss the filter effectiveness. The effect of design and operation parameters of tertiary filters were discussed related to particle removal curves derived from particles counts. Analysis of particle size distribution can be very useful to help comprehension of filtration processes, design of filtration treatments and to decide the best measures to improve filter performance.     

ICEAS工艺在污水处理厂中的运行控制实践

昆明第四污水处理厂采用ICEAS工艺,投产后运行情况良好,但也存在一些问题。针对出现的排泥不畅而导致MLSS控制不良、脱泥量不能满足生产工艺要求、污泥浓缩池不能进行有效浓缩等现象进行了分析。通过对MLSS、剩余污泥排放、DO、水温等工艺参数的调控,对生产工艺过程的摸索调试,以及对生产设备的更新改造,使污水处理厂工艺不但能达到良好的脱氮效果,而且能更好地满足除磷要求。     

生物除臭在污水处理厂中的应用

介绍了污水处理厂臭气测定方法、气味物质浓度设计值及除臭需满足的标准,并重点说明了厌氧池除臭工艺选择及生物除臭系统工程设计,最后根据除臭系统运行情况总结了设计经验。