COST DETERMINATION STUDY FOR THE FULL SCALE TWO STAGE PARTIAL NITRITATION-ANAMMOX UNIT

Abstract

In wastewater treatment plants with anaerobic sludge digestion, 15-20% of the nitrogen load is recirculated to the main stream with the digester effluent from dewatering. The treatment of the digester effluent separately may significantly reduce the nitrogen load of the activated sludge system. Nowadays, Partial Nitritation (PN)/Anammox (A) process is more prefered comparing to the conventional biological applications such as nitrification-denitrification processes due to the sustainability and costs. The sludge digester effluent taken from a full-scale municipal WWTP, in Istanbul, Turkey is successfully deammonified using a pilot-scale two-stage PN/A process. In this study, based on its results, facility design and cost analysis of a full scale plant are demonstrated. The operation cost of a full scale PN/A process is 3.77 TL/m³/day and the construction cost is calculated as 2181 TL/m³. The most important parameter that provides this cost are the temperature holding the Anammox reactor at 30 ° C and lower oxygen demand. However, it is estimated that 80% of the operation cost will be reduced if the heat is provided by the biogas from the anaerobic digesters.

Keywords

• Partial nitration/ anammox,Nitrogen removal,Full scale application,Cost estimation

TAM ÖLÇEK İKİ AŞAMALI KISMİ NİTRİTASYON-ANAMMOX ÜNİTESİ İÇİN MALİYET BELİRLEME ÇALIŞMASI

Abstract

Anaerobik çürütücü bulunan arıtma tesislerinden çamur susuzlaştırma sonucu çıkan atıksuların tesis başına geri devredilmesi tesisin azot yükünü %15-20 arttırmaktadır. Bu atıksuyun ayrı olarak enerji verimli arıtılması aktif çamur sistemine gelecek azot yükünü önemli oranda azaltabilecektir. Günümüzde, Kısmi Nitritasyon (KN)/Anammox (A) prosesinin uygulanması, nitrifikasyon-denitrifikasyon gibi konvansiyonel biyolojik arıtma yöntemlerine göre maliyet ve sürdürülebilirlik nedenleri ile daha çok tercih edilmektedir. İSKİ Ambarlı İleri Biyolojik Atıksu Arıtma Tesisi’ne (İBAAT) ait çamur çürütücü çıkışından, pilot ölçekli iki aşamalı KN/A prosesi kullanılarak başarı ile azotun giderimi sağlanmıştır. Bu tesisten alınan sonuçlar kullanılarak gerçek ölçekli tesis tasarım çalışması ve maliyet belirleme çalışmaları yapılmıştır. Anammox prosesi ile işletilen tam ölçekli bir tesisin işletme maliyeti 3,77 TL/m³/gün, ilk yatırım maliyeti ise 2181 TL/m³/gün olarak hesaplanmıştır. İşletme maliyetinin düşük seviyelerde olmasını sağlayan en önemli parametreler Anammox reaktörü için yeterli olan 30 °C sıcaklık ve oksijen ihtiyacının kısmi olmasıdır. Isıtma ihtiyacından kaynaklanan ısının anaerobik çürütme tanklarından çıkan biyogazın kullanılması ile işletme giderlerinin %80’ i azaltılacağı ön görülmektedir.

Keywords

• Kısmi nitritasyon/ anammox,Azot giderimi,Tam ölçek uygulaması,Maliyet belirleme

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