文章速读

      

  • 正文开始

    • 第一次看到Nereda这个词还是前两天看到的一则新闻《好氧颗粒污泥污水处理厂（国内首座）通过竣工验收》 ，之前通过彭永臻院士的视频课程  好氧颗粒污泥新技术（视频） 首次了解到好氧颗粒污泥技术，当时还在想这种技术在国内实际工程中较难实现，没成想，我天朝又给了无知的我一记响亮的耳光。于是乎，我就想重新认识一下好氧颗粒污泥技术，首先来具体了解下Nereda好氧颗粒污泥技术。

    一、Nereda工艺的发展历程

    Nereda是一种利用好氧颗粒生物质的独特特性来净化水的污水处理技术，可以使用由微生物构成的致密颗粒污泥来对废水进行净化。 该技术由荷兰代尔夫特大学发明，并由代尔夫特大学、荷兰应用水研究基金会（STOWA）、荷兰水务局和Royal HaskoningDHV组成的PPP项目发展而来。 目前，全球共有25家全规模的污水处理厂投入运营，64家正在建设或设计中。Nereda网站：http://www.royalhaskoningdhv.com/nereda。

    Nereda具有可持续性和成本效益：它需要传统活性污泥装置面积的四分之一，并且该工艺可减少高达50%的能源成本。这项获奖技术是由荷兰代尔夫特理工大学发明的，由该大学、荷兰应用水研究基金会（STOWA）、荷兰水务局和皇家哈斯科宁格达夫公司（Royal HaskoningDHV）通过独特的公私合作关系开发而成。

    好氧颗粒污泥NEREDA工艺的初认知

    以下引用官方原文介绍：

    Nereda is the wastewater treatment technology that purifies water using the unique features of aerobic granular biomass.

    Nereda is sustainable and cost-effective: it requires a quarter of the area of conventional activated sludge installations and the process can reduce up to 50% on energy costs. The award-winning technology was invented by the Delft University of Technology in the Netherlands and developed in a unique public-private partnership between the University, the Dutch Foundation for Applied Water Research (STOWA), the Dutch Water Authorities and Royal HaskoningDHV.

    HOW DOES IT WORK?

    Biomass in Nereda develops as fast settling aerobic granular sludge.

    These granules have excellent settling properties and therefore Nereda does not require a separate time-consuming decant phase like conventional SBR's. Further, all the biological treatment processes take place simultaneously in the granules, requiring only one tank.

    Due to the distinctive characteristics of aerobic granular biomass, Nereda technology uses an optimised SBR cycle:

    Simultaneous influent feed and effluent discharge.

    Simultaneous biological removal of organic, nitrogen and phosphorus components.

    Fast settling phase, in this phase the biomass is separated from the effluent and Nereda is ready for a new cycle.

    Since the effluent is pushed out of the tank, discharge of the effluent does not require moving decanters.

    APPLICATIONS

    GREENFIELDS

    Depending on the wastewater flow and characteristics, a Nereda plant comprises multiple modular reactors (often 3) or a combination of a feed buffer tank plus one or two reactors.

    RETROFIT CAS OR SBR

    Since the detailed configuration of Nereda is quite flexible, the technology can often be used to convert existing conventional CAS or SBR plants into a Nereda. Often the technology enables the use of approximately a two times higher biomass concentration, with outstanding biomass settling characteristics. As a result of a retrofit to Nereda, the biological and/or hydraulic capacity of existing plants will be significantly increased and/or the effluent quality will be considerably improved.

    HYBRID CAPACITY EXTENSION 

    In a hybrid application, a new Nereda plant is fed with only part of the plants raw wastewater while the remaining part is treated by the existing conventional treatment system. An important additional advantage of such a hybrid extension is that by feeding of granular surplus sludge from the Nereda into the conventional activated sludge reactors will augment the activated sludge. By this inoculation process, the sludge characteristics and settling performance of the activated sludge will improve, resulting in improved sludge settling characteristics, increased capacity and enhanced biological nutrient removal.

    一、Nereda工艺的原理

    好氧颗粒污泥具有优良的沉降性能，因此Nereda不需要像传统SBR那样单独的耗时的沉淀时间。此外，所有的生物处理过程都在颗粒中同时进行，只需要一个处理构筑物。由于好氧颗粒污泥的独特特性，Nereda技术采用了优化的SBR循环，具备以下优点：

    • 同时进水和出水排放。
    • 同时生物去除有机物、氮和磷组分。
    • 快速沉淀阶段，在这一阶段，生物质从废水中分离出来，Nereda准备好进行新的循环。
    • 由于流出物被推出罐外，因此不需要移动滗水器来排放废水。

    Nereda工艺相关论文下载：

    Nereda工艺相关出版刊物下载：

    二、Nereda工艺的应用

    根据废水流量和特性，Nereda工厂包括多个模块化反应器（通常为3个）或一个进料缓冲罐加上一个或两个反应器的组合。

    1、升级改造CASS或SBR

    由于Nereda的配置相当灵活，该技术通常可用于将现有的传统CASS或SBR装置转换为Nereda。通常，该技术能够使用大约两倍高的生物质浓度，具有突出的生物质沉降特性。通过对Nereda的改造，现有工厂的生物和/或水力容量将显著提高，并且/或污水质量将得到显著改善。

    2、混合容器扩展

    在混合应用中，一个新的Nereda工厂只使用部分工厂的原水，而其余部分则由现有的常规处理系统处理。这种混合式扩建的另一个重要优点是，通过将Nereda的颗粒剩余污泥送入传统的活性污泥反应器，可以增加活性污泥。接种强化了活性污泥的沉降特性，从而提高了污泥的沉降性能。

    3、案例视频

    https://www.royalhaskoningdhv.com/en-gb/nereda/videos  PS：视频均在YouTube，需通过油管播放~

    文章目录
  • 正文结束