Çöp sızıntı suyu arıtımı için denitrifikasyon ve kısmi nitrifikasyon proseslerinin performansı

Öz

Bu çalışma, çöp sızıntı sularından amonyum-azotun giderimi için ardışık anoksik hareketli yatak biofilm (AnoxHYBR) ve aerobik ardışık kesikli(AeAKR) reaktörün performansını araştırmayı amaçlamaktadır. Bu amaç için, AnoxHYBR ve AeAKR 48 sa.’lik döngü süresinde işletilmiştir. Her iki reaktör performansı kimyasal oksijen ihtiyacı (KOİ), çözünmüş organik karbon (ÇOK), inorganik karbon (İK), amonyum (NH4 +), nitrit (NO2 -), nitrat (NO3 -), toplam azot (TA) renk (Pt-Co ve RES) ve pH parametreleri ile değerlendirilmiştir. Ek olarak, AeAKR performansı serbest amonyum (SA) ve serbest nitröz asit (SNA) konsantrasyonları açısından değerlendirilmiştir. Ardışık sistemdekitoplam KOİ ve amonyumun giderim verimi sırasıyla %75 ve %65, AnoxHYBR'de NO3 - giderim verimi yaklaşık %55 olarak elde edilmiştir. AeAKR'de başarılı bir kısmi nitrifikasyon prosesi gerçekleştirilerek 24 sa. ve 48 sa.’lik hidrolik bekletme süresinde sırasıyla yaklaşık 1630.16 ve 1702.92 mg/L nitrit birikimi gözlemlenmiştir. Bu çalışma, ardışık denitrifikasyon/kısmi nitrifikasyon kullanımının, ham çöp sızıntı suyundan KOİ ve amonyumun giderimi için etkili bir yol olduğunu göstermektedir. Ancak, deşarj standartlarına uygun çıkış su kalitesini elde etmek için ön ve/veya son arıtım olarak ilave arıtma yöntemleri uygulanması önerilmektedir.

Anahtar Kelimeler

• Denitrifikasyon
• Çöp sızıntı suyu
• Kısmi nitrifikasyon
• Hareketli yatak biofilm reaktör
• Ardışık kesikli reaktör

Performances of sequential denitrification and partial nitrification process for treatment of landfill leachate

Abstract

This study aims at investigating the sequential denitrification and the partial nitrification performance of anoxic moving bed reactor (AnoxMBBR)-aerobic sequencing batch reactor (AeSBR) to remove ammonium-nitrogen from landfill leachate (LFL). For this purpose, AnoxMBBR and AeSBR were set-up and operated at a cycle time of 48-h. The both reactor performances were evaluated by chemical oxygen demand (COD), dissolved organic carbon (DOC), inorganic carbon (IC), ammonium (NH4 +), nitrite (NO2 -), nitrate (NO3 -), total nitrogen (TN), color (Pt-Co and RES) and pH parameters. Additionally, the AeSBR performance was evaluated in terms of free ammonium (FA) and free nitrous acid (FNA) concentrations. In the sequential system, total removal efficiency of COD and ammonium was about 75% and 65%, respectively. In AnoxMBBR, also, NO3 - removal efficiency was about 55%. The partial nitrification was successfully occurred in AeSBR and the nitrite accumulation at 24-h and 48-h was about 1630.16 and 1702.92 mg/L, respectively. The results of this study suggest that use of sequential denitrification/partial nitrification is an effective way to remove COD and ammonium from raw LFL However, additional treatment methods to this sequential system can be applied as pretreatment and/or post treatment for achieving the desired water quality because effluent TN and COD values are still not meet with the discharge standards of 40 mg N/L and 600 mg COD/L.

Keywords

• Landfill leachate
• Partial nitrification
• Moving bed biofilm reactor
• Sequencing batch reactor

Kaynakça

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