Simulation of organic matter and nitrogen removal performance in the treatment of low-strength domestic wastewater using the modified Ludzack-Ettinger process with the ASM1 model

Abstract

In this paper, a system with low-strength domestic wastewater characteristics was modeled. The system, which was structured according to the continuous flow Modified Ludzack-Ettinger (MLE) process, was simulated using LYNX software based on ASM1 (Activated Sludge Model No. 1). During the modeling process, soluble and particulate biodegradable organic matter (Ss, Xs), nitrogen components (SNH, SND, SNO, XND), inert substances (SI, XI), microbial biomass (XBH, XBA, XP), alkalinity, and COD changes were monitored and evaluated over a 24-hour operating period. According to the results obtained, the system was able to remove 96% of soluble COD and 99.9% of particulate COD. NH₄⁺-N removal was quite high (>95%), but total nitrogen removal remained limited. The results demonstrated that the ASM1 model is an effective tool for simulating biological process behavior and that the MLE process has high potential for organic matter and nitrogen removal in the treatment of low-strength wastewater.

Keywords

• Mathematical modelling
• Biological organic matter and nitrogen removal
• LYNX Software Tool
• Modified Ludzack-Ettinger
• ASM1 model

Düşük kuvvetli evsel atıksuyun modified Ludzack-Ettinger prosesiyle arıtımında organik madde ve azot giderim performansının ASM1 modeli ile simülasyonu

Öz

Makalede, düşük kuvvetlikte evsel atıksu karakteristiğine sahip bir sistem modellenmiştir. Sürekli akışlı Modifiye Ludzack-Ettinger (MLE) prosesine göre yapılandırılan sistemde, simülasyonlar ASM1 (Activated Sludge Model No.1) esas alınarak LYNX yazılımı ile gerçekleştirilmiştir. Modelleme sürecinde çözünür ve partikül biyolojik olarak parçalanabilir organik maddeler (Ss, Xs), azot bileşenleri (SNH, SND, SNO, XND), inert maddeler (SI, XI), mikroorganizma biyokütlesi (XBH, XBA, XP), alkalinite ve KOİ değişimleri 24 saatlik işletim süresi boyunca izlenmiş ve değerlendirilmiştir. Elde edilen sonuçlara göre, sistem çözünür KOİ’nin %96’sını, partikül KOİ’nin ise %99,9’unu giderebilmiştir. NH₄⁺-N giderimi oldukça yüksek gerçekleşmiş (>%95), ancak toplam azot giderimi sınırlı kalmıştır. Sonuçlar, ASM1 modelinin biyolojik proses davranışlarının simülasyonunda etkili bir araç olduğunu ve düşük kuvvetlikte atıksuların arıtımında MLE prosesinin organik madde ve azot giderimi açısından yüksek potansiyele sahip olduğunu ortaya koymuştur.

Anahtar Kelimeler

• Matematiksel modelleme
• Biyolojik organik madde ve azot giderimi
• LYNX Yazılım Aracı
• Modifiye Ludzack-Ettinger
• ASM1 modeli

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