Model based evaluation of plant improvement at a large wastewater treatment plant (WWTP)

Abstract

In this work, the effect of the improvement carried out at a large-scale wastewater treatment plant (WWTP) was evaluated, by means of modelling works, with the aim to determine the influence of the modernization over the process performance. After modernization, the energy consumption due to the aeration decreased about a 20% maintaining the effluent quality. In order to double-check the good effluent quality, modelling works were carried out at the full-scale plant. After calibration, the model was applied to the upgraded full-scale plant obtaining deviations lower than 10%. Then, the performance of the main biochemical processes was evaluated in terms of oxygen uptake rate (OUR), ammonia uptake rate (AUR), and chemical oxygen demand (COD) consumption. The rate of the main processes depending on the aeration, that is OUR and AUR, were about 22 gO/(kg VSS·h) and 2.9 gN/(kg VSS·h), respectively.

Advanced Supervisory Control System Implemented at Full-Scale WWTP—A Case Study of Optimization and Energy Balance Improvement

“…For a "Klimzowiec" WWTP a period of intensive monitoring and sampling probes, which was more than 6 months in duration. Data sets from the full-scale plant (including tracer test and the laboratory/online measurements) were used from this study (as was presented in Table 2 and 3) and compared with historical data and a previous study [2,15]. All these investigations were further used for steady-state and then dynamic-state simulations in the WEST software to accurately calibrate the studied WWTP model.…”

“…By using advanced software (WEST, GPS-x, SIMBA, AQUASIM, etc. ), it is possible to create a model of a full-scale WWTP in order to run a simulation and, subsequently, interpret results under various operational conditions [1][2][3]. The laboratory tests, online measurements and additional calculations (e.g., COD fractions and biochemical processes rates) should be carried out to better integrate the computer model to the conditions prevailing in the local parameters of each individual part of WWTPs [4].…”

“…Moreover, general-purpose modeling and simulation tools (e.g., MATLAB ® /Simulink ® , C++ Generator) lack specific wastewater treatment processes that are integrated into the model libraries and/or general purpose simulation packages, commonly used for the design and implementation of wastewater automatic controllers in full-scale WWTPs. Therefore, the knowledge of the building process of the architecture structure and the complex model to create an advanced supervisory control system (ASCS) through mathematical representation and computer simulations was used according to the literature (e.g., References [12,13]) and the author's experience from this study and a previous study (model-based evaluation of plant improvement at one of the largest facilities in Northern Poland "Debogorze" WWTP presented by Drewnowski et al [2]).…”

Economic Analysis: Trickling Filter/Activated Sludge or Nitrifying Trickling Filter/Activated Sludge?

“…Amount of ammonia in treated water from the MWWTP based on TF/AS process and the MWWTP based on NTF/AS process were 1.38 and 1.29 mg/dm 3 , respectively; which were lower than standard value of about 2 mg/dm 3 (the maximum concentration of ammonia and ammonia compounds allowed for the fish at a temperature of 18 °C and pH of 5-7) [1, 12]. Drewnowski et al [25] studied the effect of the improvement performed at a large-scale WWTP by means of modeling works and reported the rate of the main processes depending on the aeration, that is oxygen uptake rate (OUR) and ammonia uptake rate (AUR), to be about 22 g O 2 /(kg VSS·h) and 2.9 g N/(kg VSS·h), respectively [25].…”

“…Drewnowski et al [25] evaluated the effect of the improvement performed at a large-scale WWTP by means of modeling works, with the aim to determine the influence of the modernization over the process performance. They concluded that the energy consumption because of the aeration reduced about a 20 % maintaining the effluent quality [25].…”