Samsun Sahili midye kabuklarının ağır metal giderim potansiyelinin belirlenmesi

Yıl 2018, Cilt: 24 Sayı: 6, 1135 - 1140, 18.12.2018

Levent Gürel , Selahi Güneş

Öz

Bu
çalışma kapsamında Samsun Sahilleri’nden toplanan midye kabukları kullanılarak,
bu kabukların sentetik olarak hazırlanmış atıksulardan kurşun ve nikel gibi
ağır metalleri giderme kapasitesi araştırılmıştır. Yapılan çalışmalarda, midye
kabukları iki ayrı şekilde kullanılmıştır. Bunlardan ilkinde, ham midye
kabukları sadece öğütülmüştür. Diğerinde ise, kabuklar öğütüldükten sonra
sülfürik asit kullanılarak ön arıtımdan geçirilmiştir. Deneysel çalışmalarda
pH, zaman, midye kabuğu miktarı gibi çeşitli değişkenler kullanılarak midye
kabuklarının ağır metal giderim potansiyeli incelenmiştir. Çalışmalar 25 °C
sabit sıcaklık ve 150 devir/dk. çalkalama hızında yürütülmüştür. Deneylerde
kullanılan midye kabuğu boyutu 45-125 µm olarak seçilmiştir. Yapılan çalışmalar
neticesinde elde edilen sonuçlara göre, ham olarak kullanılan midye
kabuklarıyla yapılan deneylerde, arıtım sonrası pH değerleri dikkate alınarak,
kimyasal çöktürme mekanizmasının hâkim mekanizma olduğu sonucuna varılmıştır.
Ön arıtımlı (asitle muamele edilmiş) midye kabuklarının arıtım performansı
incelendiğinde ise, meydana gelen arıtım mekanizmasının adsorpsiyonu temsil
ettiği anlaşılmıştır. Ham midye kabukları kullanılarak, kurşun ve nikel iyonu
konsantrasyonları yaklaşık olarak 100 mg/L’den sırasıyla en düşük 3.9 mg/L ve
73.62 mg/L’ye indirilmiştir. Ön arıtımlı midye kabukları ile yapılan
çalışmalarda ise sadece kurşun giderimi araştırılmış ve yaklaşık 100 mg/L olan
başlangıç konsantrasyonu pH 2’de 9.22 mg/L’ye düşürülmüştür. Ön arıtımlı midye
kabukları için adsorbent tutma kapasitesi (q) 0.4 g/L midye kabuğu dozajında
244.74 mg/g olarak bulunmuştur.

Anahtar Kelimeler

Karadeniz midye kabuğu, Adsorpsiyon, Kimyasal çöktürme, Ağır metal arıtımı

Determination of heavy metal removal potential of the Samsun Coast mussel shells

Öz

The
removal capacity of mussel shells in removing heavy metals such as lead and
nickel from wastewaters prepared synthetically was investigated by using the
shells collected from Samsun Coasts within the scope of this work. In the
studies, mussel shells were used in two different forms. In the first form, raw
mussel shells were only grinded. On the other one, the mussel shells were
pretreated by using sulfuric acid after grinding. The heavy metal removal
potential of mussel shells was investigated using various variables such as pH,
time and mussel shell dosage in experimental studies. Tests were conducted at
25 °C constant temperature and a shaking speed of 150 rpm. The size of the
mussel shell used in experimental studies was chosen as 45-125 µm. It was
concluded from the results of the studies carried out by using raw mussel
shells that the dominant mechanism was chemical precipitation according to the
pH values after treatment process. It has been understood that the treatment
mechanism was adsorption when the treatment performance of the pretreated
mussel shells was in question. Lead and nickel ion concentrations were reduced
from approximately 100 mg/L to 3.90 mg/L and 73.62 mg/L, respectively by using
raw mussel shells. In the tests conducted with pretreated mussel shells, only
lead removal was studied and lead concentration of approximately 100 mg/L was
decreased to 9.22 mg/L at pH 2. Adsorbent uptake capacity was found to be
244.74 mg/g at 0.4 g/L mussel shell dosage for pretreated mussel shells.

Anahtar Kelimeler

Black Sea mussel shell, Adsorption, Chemical precipitation, Heavy metal treatment

Kaynakça

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