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

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 were 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.

Samsun Sahili midye kabuklarýnýn aðýr metal giderim potansiyelinin belirlenmesi

Bu çalýþma kapsamýnda Samsun Sahilleri’nden toplanan midye kabuklarý kullanýlarak, bu kabuklarýn sentetik olarak hazýrlanmýþ atýksulardan kurþun ve nikel gibi aðýr metalleri giderme kapasitesi araþtýrýlmýþtýr. Yapýlan çalýþmalarda, midye kabuklarý iki ayrý þekilde kullanýlmýþtýr. Bunlardan ilkinde, ham midye kabuklarý sadece öðütülmüþtür. Diðerinde ise, kabuklar öðütüldükten sonra sülfürik asit kullanýlarak ön arýtýmdan geçirilmiþtir. Deneysel çalýþmalarda pH, zaman, midye kabuðu miktarý gibi çeþitli deðiþkenler kullanýlarak midye kabuklarýnýn aðýr metal giderim potansiyeli incelenmiþtir. Çalýþmalar 25°C sabit sýcaklýk ve 150 devir/dakika çalkalama hýzýnda yürütülmüþtür. Deneylerde kullanýlan midye kabuðu boyutu 45-125 µm olarak seçilmiþtir. Yapýlan çalýþmalar neticesinde elde edilen sonuçlara göre, ham olarak kullanýlan midye kabuklarýyla yapýlan deneylerde, arýtým sonrasý pH deðerleri dikkate alýnarak, kimyasal çöktürme mekanizmasýnýn hâkim mekanizma olduðu sonucuna varýlmýþtýr. Ön arýtýmlý (asitle muamele edilmiþ) midye kabuklarýnýn arýtým performansý incelendiðinde ise, meydana gelen arýtým mekanizmasýnýn adsorpsiyonu temsil ettiði anlaþýlmýþtýr. Ham midye kabuklarý kullanýlarak, kurþun ve nikel iyonu konsantrasyonlarý yaklaþýk olarak 100 mg/L’den sýrasýyla en düþük 3.9 mg/L ve 73.62 mg/L’ye indirilmiþtir. Ön arýtýmlý midye kabuklarý ile yapýlan çalýþmalarda ise sadece kurþun giderimi araþtýrýlmýþ ve yaklaþýk 100 mg/L olan baþlangýç konsantrasyonu pH 2’de 9.22 mg/L’ye düþürülmüþtür. Ön arýtýmlý midye kabuklarý için adsorbent tutma kapasitesi (q) 0.4 g/L midye kabuðu dozajýnda 244.74 mg/g olarak bulunmuþtur.