Recep KAYA, HALE ÖZGÜN ERŞAHİN, Börte KÖSE MUTLU, MUSTAFA EVREN ERŞAHİN, MAHMUT ALTINBAŞ, Sema SAYILI, Pelin HOŞHAN, Doğa ATAY, Esra EREN, Cumali KINACI, İSMAİL KOYUNCU

PETROL VE DOĞAL GAZ ÜRETİM ATIKSULARININ BİYOLOJİK ARITILABİLİRLİĞİNİN İNCELENMESİ

Üretim atıksuyu petrol ve doğalgaz üretimi sırasında oluşarak petrol ve doğalgazın yeraltından pompalanması ile birlikte yüzeye çıkmaktadır. Üretim atıksuyu, içerisinde birçok organik ve inorganik bileşik içeren ve bu nedenle deşarjı öncesinde uygun şekilde arıtılması gereken bir atıksu türüdür. Üretim atıksularının arıtılmasında fiziksel, kimyasal ve/veya biyolojik yöntemler kullanılmaktadır. Bu çalışmada, petrol ve doğalgaz üretim atıksularının biyolojik olarak arıtılabilirliğinin ortaya konması amaçlanmıştır. Bu kapsamda; petrol ve doğalgaz üretimi ve sadece doğalgaz üretimi yapan sahalardan elde edilen üretim atıksuyu ardışık kesikli reaktör (AKR) sisteminde arıtılmıştır. Doğalgaz üretim sahasından alınan atıksuyun yüksek tuzluluk içeriğinden dolayı, biyolojik arıtılabilirliğinin düşük seviyede olduğu görülmüştür. Petrol ve doğalgaz üretim sahasından alınan üretim atıksuyunda ise ortalama KOİ giderim verimi %68 seviyesine ulaşmıştır. Petrol ve doğalgaz üretim atıksuyunun biyolojik olarak arıtılamayacak (inert) fraksiyonları da çalışma kapsamında belirlenmiştir. Üretim atıksuyunda %86 oranında biyolojik olarak giderilebilen KOİ içeriği olduğu saptanmış ve geri kalan kısmın inert partiküler ve inert çözünmüş KOİ olduğu tespit edilmiştir. Üretim atıksuyunda inert karakterizayonun ve biyolojik arıtılabilirliğinin belirlenmesi, en uygun arıtma prosesi seçiminde yol gösterici olması bakımından oldukça önemlidir.

Anahtar Kelimeler:

Ardışık kesikli reaktör, biyolojik arıtılabilirlik, inert KOİ, toplam petrol hidrokarbonları, petrol ve doğal gaz üretim atıksuyu

Investigation of Biological Treatability of Produced Water Generated from Oil and Gas Fields

Produced water is co-produced during oil and gas production and the oil/water mixture is pumped out of the well to the surface. Produced water contains various organic and inorganic components and thus, should be treated properly before its discharge. Physical, chemical and biological methods are used for the treatment of produced water. The aim of this study was to determine the biological treatability of produced water originated from oil and natural gas fields. Within this concept, produced water from oil and natural gas field, and from natural gas field was treated by sequencing batch reactors (SBR). Because of the high salinity content of the produced water from natural gas field, biological treatability of the samples from this field was very low. Average COD removal efficiency of 68% was achieved in the SBR treating produced water from oil and natural gas field. Non-biodegradable (inert) fractions of the produced water were also determined in the study. Biodegradable COD constituted 86% of total COD in the produced water. The rest part of the total COD was found as inert (particulate and soluble) COD. Determination of the inert characterization and biological treatability of the produced water is very critical for the selection of the most appropriate treatment method.

Keywords:

Biological treatability, inert COD, produced water, sequencing batch reactor, total petroleum hydrocarbons,

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