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Development of a control system based on fuzzy logic for the volatile fatty acid production in a primary sludge fermentation process.

机译：开发基于模糊逻辑的控制系统，用于初级污泥发酵过程中挥发性脂肪酸的生产。

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摘要

The phosphorus removal in the industrial and the urban wastewater is a key point in wastewater treatments, because the control of point-source phosphorus discharges is regarded as the most effective method in limiting the eutrophication of water bodies.; Biological phosphorus removal represents a substantial difference in comparison of chemical phosphorus removal, since it is more profitable. Thus, during the last few years many wastewater treatment plants have adopted biological phosphorus removal mechanisms.; The biological phosphorus removal mechanisms require the presence of certain minimum concentrations of readily biodegradable components, in particular volatile fatty acids (VFA). These VFA can be obtained from the fermentation of the primary sludge. Any wastewater treatment plant could take advantage of the typical infrastructure using the primary settler as an activated primary tank (APT), in order to ferment the primary sludge. This kind of prefermentation system could be optimized through a sludge blanket height control that allows larger sludge blanket heights to be maintaining without seriously affecting the efficiency of the primary settler. As well, it is necessary to control the return sludge flow in order to obtain the minimum necessary amount of VFA in the effluent.; The present thesis has been focused on the development of a system to control the sludge blanket height and the pH of the effluent of the primary settler, in an APT system. Due to the relation between the pH and the AGV, the former has been used as an indirect measurement to control the latter at the effluent. The development of the control system is basically divided into two parts. The first one has been designed to control the sludge blanket height, the other part, has been designed to control the pH of the effluent of the primary settler.; The control system utilizes algorithms based on fuzzy logic, which make it possible to devise a robust control system using an understanding of the APT systems, making it able to confront abnormal situations. Also, the control system has been optimized in order to obtain a proper operation from a minimal number of rules facilitating the tuning of the parameters of the control.
机译：工业和城市废水中的除磷是废水处理中的关键点，因为控制点源磷排放被认为是限制水体富营养化的最有效方法。与化学除磷相比，生物除磷表现出很大的不同，因为它的利润更高。因此，在最近几年中，许多废水处理厂采用了生物除磷机制。生物除磷机理要求存在一定最低浓度的易生物降解组分，尤其是挥发性脂肪酸（VFA）。这些VFA可以从原始污泥的发酵中获得。任何废水处理厂都可以利用将初级沉降器用作活化初级池（APT）的典型基础设施来发酵初级污泥。可以通过污泥层高度控制来优化这种优先系统，该控制允许保持较大的污泥层高度，而不会严重影响主沉降器的效率。同样，有必要控制回流污泥的流量，以使流出物中的VFA最少。本论文的重点是在APT系统中开发一种控制污泥层高度和一级沉降池出水pH值的系统。由于pH和AGV之间的关系，前者已用作间接测量，以控制后者在废水中的含量。控制系统的发展基本上分为两部分。第一个用于控制污泥层的高度，第二个用于控制主沉降器废水的pH。该控制系统利用基于模糊逻辑的算法，这使得有可能通过了解APT系统来设计鲁棒的控制系统，使其能够应对异常情况。同样，控制系统已经过优化，以便从最少数量的规则中获得适当的操作，从而有利于调整控制参数。

著录项

  • 作者

    Chanona Soto, Josue.;

  • 作者单位

    Universidad Politecnica de Valencia (Spain).;

  • 授予单位 Universidad Politecnica de Valencia (Spain).;
  • 学科 Environmental Sciences.; Engineering Environmental.
  • 学位 Dr.
  • 年度 2005
  • 页码 277 p.
  • 总页数 277
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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