07. Rektörlüğe Bağlı Birimler

Permanent URI for this communityhttps://hdl.handle.net/20.500.13091/1630

Browse

Browsing 07. Rektörlüğe Bağlı Birimler by Department "Fakülteler, Mühendislik ve Doğa Bilimleri Fakültesi, Çevre Mühendisliği Bölümü"

Filter results by typing the first few letters
Now showing 1 - 3 of 3
  • Thumbnail Image
    Article
    Güneydoğu Anadolu Bölgesindeki İllerin Kuraklık Analizi
    (Konya Technical University, 2019) Tuğrul, Türker; Doğan, Selim; Dursun, Şükrü
    Bu çalışmada Güneydoğu Anadolu Bölgesindeki illerin kuraklık analizi yapılmıştır. Çalışmada 9 istasyondan alınan 1960-2016 yılları arasındaki aylık toplam yağış verileri kullanılmıştır. Analiz için en az 30 senelik kesintisiz veri setine ihtiyaç duyulmaktadır. Bu koşul Şırnak istasyonunda sağlanamamıştır. Analizde Efektif Kuraklık İndeksi (EKİ) yönteminden yararlanılmıştır. Çalışma sonucunda Adıyaman istasyonunda 22, Batman istasyonunda 15, Diyarbakır istasyonunda 24, Gaziantep istasyonunda 25, Kilis istasyonunda 20, Mardin istasyonunda 9, Siirt istasyonunda 18, Şanlıurfa istasyonunda 21 olmak üzere toplamda 154 kuraklık olayı tespit edilmiştir. 1970-1979 dönemi kuraklık olaylarının en fazla yaşandığı dönemdir. Analiz yapılan 681 aylık zaman periyodu göz önüne alındığında; bu periyotta tüm zamanların ortalama %19’luk zaman diliminin bölgeyi etkileyen kuraklıklarla geçtiği belirlenmiştir.
  • Thumbnail Image
    Article
    Citation - Scopus: 4
    Life Cycle Assessment of Microbial Electrolysis Cells for Hydrogen Generation Using Traci Methodology
    (Sakarya University, 2022) Tutar Öksüz, Seçil
    Bio electrochemical systems (BESs) use electrochemically active microorganisms to convert the chemical energy of organic matter into electrical energy, hydrogen, or other useful products through redox reactions. Microbial electrolysis cell (MEC) is one of the most common BESs which are able to convert organic substrate into energy (such as hydrogen and methane) through the catalytic action of electrochemically active bacteria in the presence of electric current and absence of oxygen. In the past decades, BESs have gained growing attention because of their potential, but there is still a limited amount of research is done for the environmental effects of BESs. This study initially provides an update review for MECs including general historical advancement, design properties, and operation mechanisms. Later, a life cycle assessment (LCA) study was conducted using a midpoint approach, which is TRACI methodology with EIO-LCA model to identify the potential impacts to the environment whether adverse or beneficial using the MECs to produce hydrogen with domestic wastewater as a substrate. The results show that the cumulative negative impacts were substantially larger than the positive impacts by contrast with the expectations, and the cumulative output data show that human health non-cancer impact provides the highest environmental effects than others mainly because of the inorganic chemicals, pumping and wastewater recycling equipment step. In addition, global warming potential and smog creation potential are also elevated mainly due to electricity usage, inorganic chemical and glassware reactor production. Later we are externally normalized each impact category to compare the results at the normalization level, and we again found that human health (cancer or non-cancer) potential provides the most negative impact on the environment in the MEC system originates on human health indicators. © 2022, Sakarya University. All rights reserved.
  • Thumbnail Image
    Article
    Preliminary Investigation of Anaerobic Co-Digestion Potential of Primary and Secondary Sewage Sludge Fractions With Fruit Waste
    (Konya Technical University, 2021) Erdirençelebi, Dilek
    Co-digestion feasibility of primary (PS) and secondary (SS) sewage sludge fractions produced in a municipal wastewater treatment plant (WWTP) was investigated by the mixing of fruit waste in sequential batch reactors. Toxic threshold level for pH was exceeded as fruit waste digestion produced a high level of volatile fatty acid (VFA) concentration. Alkali (NaOH) addition provided an optimum level of pH at 7.95-8.05 and 8.16-8.25 in the co-digestion of PS and SS, respectively, and efficient conversion of VFA to methane gas eliminating VFA accumulation. Buffered co-digestion resulted in 55% (+227-271 mL) and 400% (+501-546 mL) increase in biogas production compared to solely PS and SS stabilization. Fruit waste digestion’s positive effect was obtained at a higher level in SS digestion. pH rather than VFA proved to be the key parameter and NaOH highly effective as an alkali source producing double buffering effect by converting carbonic acid produced to bicarbonate alkalinity. High carbohydrate content of fruit waste exhibited a beneficial potential to neutralize high pH occurring in PS and SS digestion, thus, minimize free ammonia toxicity balancing hydroxide alkalinity formed from protein hydrolysis. Optimization of fruit waste loading rate based on pH will enable surplus energy gain and stable operation in sewage sludge and protein-rich wastewater digestion.