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提问时间 2014-08-13 09:25
荷兰Noorderzijlvest 水务局采用“Nereda”颗粒活性污泥工艺，只新建了很小的池容，就将Garmerwolde污水厂的处理能力提高了40%，“Nereda”工艺无需二沉池，采用SBR模式运行，颗粒污泥具有很高的沉淀速率，可边沉淀边滗水，与常规活性污泥法相比，能耗至少节省30%！
该工艺最初由荷兰Delft 大学的Mark van Loosdrecht教授发明，他也是Sharon®, Anammox®等革新工艺的发明者，他也是“可持续污水厂”最早的倡导者和推进者，他提出的“NEWs”框架，给全世界污水厂未来发展指明了方向，该框架的精髓是：未来污水处理厂将是营养物（Nutrient）、能源（Energy）与再生水（Water）的制造工厂（factories），因此简称”NEWs"，NEWs框架强调资源回收与能量自给，在此基础上，荷兰制定了面向2030年的NEWS污水厂发展框架及技术路线图，并示范了各种不同回收目的可能采取的工艺步骤（概念工艺）。
具体内容如下（请谅解，英文，来不及翻译）：
Nereda is a new waste water treatment technology featuring a new generation aerobic granular activated sludge technology.
图1 好氧颗粒污泥与活性污泥的沉淀特性比较（沉淀5min)
图2 活性污泥絮体与颗粒污泥结构组成的不同
The technology is invented by Delft University of Technology and developed in a unique public-private partnership between Delft University of Technology, Applied research institute STOWA, the Dutch water boards and Royal HaskoningDHV.
There are currently about 12 international full-scale Nereda® installations in operation for the treatment of industrial and municipal wastewater, and the number of references is growing fast, as shown in table 1.
The Nereda® process operates intermittently, with the fill and decant phase occurring simultaneously. Due to good settling capacity of the aerobic granules, the process does not require mechanical decanters to ensure low solids in the effluent. The key advantages of Nereda® are summarized as follows:
- Cost-effective
• Compact and uncomplicated tank design
• Less mechanical equipment
• No separate clarifiers
• Lower capital expenditures
• Lower Operation & Maintenance costs
• No or minimal chemicals
• Lower energy consumption
- Easy to operate
• Easy plant operation
• Robust and reliable process performance
• Integrated AquaSuite® Nereda® Controller process controller
• Fully automated plant operation
• Remotely controlled or by a central control room
• Remote support capabilities by process specialists
- Sustainable
• Remarkably high effluent purity
• No or minimal use of chemicals
• Significantly lower energy consumption
• Less construction materials required
• As little as a quarter of the land area required
• More efficient nutrient removal
• Lower operational and embedded carbon footprint
The new Nereda plant at wwtp Garmerwolde was officially commissioned on 8 October 2013. It is the second full scale plant in the Netherlands, the first being the Nereda plant at wwtp Epe.
The installation was constructed by GMB Civiel and Imtech Infra. The total cost of the project was 20 million euro.
Largest Nereda installation to date
Secretary-general Siebe Riedstra of the Ministry of Infrastructure and Environment officially opened the new installation.
On the occasion Global director water products René Noppeney of Royal HaskoningDHV congratulated the water board with the milestone: "It is the largest Nereda installation to date. A beautiful project, which we can all be proud of".
The total cost of the new Nereda installation was 20 million euro.
Additional treatment capacity
The new Nereda system is added to the existing conventional treatment plant and gives an additional capacity for the waste water of 140,000 people with less energy and without chemicals .
Wwtp Garmerwolde is now in full compliance with current statutory requirements for purification and discharge of wastewater . The total purification capacity for the whole wwtp now amounts to 375,000 people
Two other Dutch Nereda plants are under construction at wwtp Vroomshoop and wwtp Dinxperlo. Both are expected to be commissioned next year.
Nereda in a nutshell
Nereda is a distinguished, innovative technology to treat wastewater using less energy and chemicals and a smaller footprint than conventional treatment plants. Nereda purifies wastewater with the unique characteristics of aerobic granular sludge. The purifying bacteria in creating Nereda compact granules with excellent settling properties.
The success of Nereda is its high water treatment capability in combination with significantly lower investment and operational costs, a very small physical footprint (up to a factor 4 smaller) and high energy savings (20-30%).
(both photos: Water board Noorderzijlvest)
