İkincil arıtılmış kentsel atıksulardaki azot ve fosforun toprak-akifer arıtma sistemi kullanılarak giderilmesinde toprak tiplerinin etkisi

Bu çalışmada farklı iki tip toprak kullanılarak hazırlanmış laboratuvar ölçekli bir toprak-akifer arıtma sistemi ile ikincil arıtılmış atıksulardaki azot ve fosforun toprak derinliği boyunca giderim verimi ve toprak tiplerinin arıtma verimine etkisi araştırılmıştır. Killi tınlı toprak (KTT) ve tınlı toprak (TT) ile doldurulmuş kolonlarda besleme atıksuyu olarak Denizli İli (Türkiye) kentsel atıksu arıtma tesisi çıkışından alınmış ikincil arıtılmış kentsel atıksu kullanılmıştır. Deneysel çalışmalar sırasında kolonlara takılmış farklı derinliklerdeki vanalardan alınan süzüntü numunelerinde toplam-N, toplam-P, çözünmüş oksijen, pH ve sıcaklık parametreleri ölçülmüştür. 75 cm derinliğindeki son vanalardan alınan süzüntü numunelerinde KTT’de toplam-N %50.85, toplam-P %97.07 oranında giderilirken TT’de bu değerler sırasıyla %36.72 ve %64.43 olarak hesaplanmıştır. Ayrıca, her iki toprak tipinde de toplam-N ve toplam-P giderimi için ilk 10 cm oldukça etkili olmuştur. Çalışma sonucunda TT’nin hem toplam-N hem de toplam-P gideriminde KTT’ye göre daha az etkili olduğu, her iki toprakta da derinlik arttıkça giderim veriminin de arttığı ve deneysel çalışmalar süresince giderim verimlerinde zamana bağlı herhangi bir azalmanın olmadığı görülmüştür.

Anahtar Kelimeler:

Toprak-akifer arıtma sistemi, Yönetilen akifer şarjı, Azot ve fosfor giderimi, Atıksu arıtımı, Doğal arıtma

The effect of soil types on nitrogen and phosphorus removal from secondary treated municipal wastewater by using soil-aquifer treatment system

In this study, the removal efficiency of nitrogen and phosphorus in secondary treated wastewaters with a laboratory scale soil-aquifer treatment system prepared using two different types of soils and the effect of soil types on treatment efficiency were investigated. In the columns filled with clayey loam soil (CLS) and loamy soil (LS), secondary treated municipal wastewater taken from the effluent of Denizli province (Turkey) municipal wastewater treatment plant was used as feed wastewater. During the experimental studies, the total-N, total-P, dissolved oxygen, pH and temperature parameters were measured in the permeate samples taken from the valves at different depths attached to the columns. In the permeate samples taken from the last valves at a depth of 75 cm, total-N was 50.85% and total-P 97.07% in CLS, while these values were calculated as 36.72% and 64.43% in LS, respectively. In addition, the first 10 cm was highly effective for total-N and total-P removal in both soil types. Consequently, It was observed that TT was less effective than KTT in both total-N and total-P removal, the removal efficiency increased as the depth increased in both soils, and there was no time-dependent decrease in the removal efficiency during the experimental studies.

Keywords:

Nitrogen and phosphorus removal, Soil-aquifer treatment system, Natural treatment, Wastewater treatment, Natural treatment,

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