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Biyolojik arıtma çamurları organik madde, azot ve fosfor içeriği yönünden zengin bir kaynaktır. Bu nedenle tarımda kullanımı oldukça önemlidir. Magnezyum amonyum fosfat (MAP) çöktürmesi sonucu elde edilen strüvit, endüstriyel hammadde ve tarımsal gübre olarak kullanım için uygundur. Arıtma çamurlarından azot ve fosfor geri kazanımı için kullanılan yöntemlerin başında asidik şartlarda azot ve fosforun sıvı faza geçirilmesi gelmekte ve akabinde MAP çökelmesi ile strüvit elde edilmesi sağlanmaktadır. Bu yöntem için en büyük sorun asidifikasyon işlemi ile sıvı faza geçen ağır metallarin strüvite bağlanmasıdır. Çalışmamızda yeni bir çamur dezentegrasyon yöntemi darbeli elektrik alan (PEF) tekniği ile evsel nitelikteki biyolojik atık çamurdan azot ve fosfor geri kazanımı gerçekleştirilmiştir. Çalışma iki aşamadan oluşmaktadır. Birinci aşama; biyolojik atık çamurdaki azot ve fosforun kimyasal eklemeden PEF tekniği ile geri kazanımı. İkinci aşama ise PEF ön arıtımı sonrası sıvı fazda elde edilen yüksek azot ve fosfordan MAP çöktürmesi ile strüvit elde edilmesi şeklindedir. MAP çökeltim testlerinde optimum sıcaklık, pH ve çökelme süresi sırasıyla 20 °C, 9.5 ve 24 saat olarak belirlenmiştir. En iyi çökelme ve giderim verimi 2.5 ml MgCl2.6H2O (0.015 M) ve 2.5 ml H3PO4 (0.049M) eklenmiş örnekte elde edildi. Çökeltim sonrası TN ve TP giderim verimleri sırasıyla %52 ve %14’tür. Çökeltim sonrası kristal yapılı çökelti oluşumu gözlenmiş ve XRD analizi sonucunda bu çökeltinin strüvit olduğu tespit edilmiştir.
Biological purification stems are a rich source of organic matter, nitrogen and phosphorus content. This is why use in agriculture is very important. Magnesium ammonium phosphate (MAP) is suitable for use as a raw material and agricultural fertilizer. The methods used for the recovery of nitrogen and phosphorus from the processing stumps are at the beginning of the acidic conditions that nitrogen and phosphorus are passed through the liquid phase and after that the MAP collapse is achieved with the extract of struvit. The biggest problem for this method is the string of heavy metals that pass through the liquid phase with the acidification process. In our study, a new steam disintegration method has been carried out with the PEF (Packed Electric Field) technique for home-quality biological waste nitrogen and phosphorus recovery from steam. The work consists of two stages. The first phase is the recovery of nitrogen and phosphorus in the biological waste dust with PEF technique without chemical addition. The second phase is in the form of the extract of struvit from high nitrogen and phosphorus obtained in the liquid phase after PEF pre-treatment. In MAP disintegration tests, the optimal temperature, pH and disintegration time are determined at 20 °C, 9.5 and 24 hours respectively. The best breakdown and dissolving efficiency was obtained in 2.5 ml MgCl2.6H2O (0.015 M) and 2.5 ml H3PO4 (0.049M) added sample. After the collapse, the TN and TP expenditure yields are 52% and 14% respectively. The formation of crystal-made waste after the disintegration was observed and the XRD analysis found that this waste was struvite.
Sewage sludge is a rich source of organic matter, nitrogen and phosphorus content. For this reason, its use in agriculture is very important. Strüvite obtained as a result of magnesium ammonium phosphate (MAP) settlement is suitable for use as industrial raw material and agricultural fertilizer. At the beginning of the methods used for the recovery of nitrogen and phosphorus from sludge, nitrogen and phosphorus are introduced into liquid phase under acidic conditions. Then the struvite is obtained by MAP precipitation. The biggest problem for this method is the bonding of heavy metals passing liquid phase by acidification to struvite. In our work, a new sludge disintegration method, pulsed electric field (PEF) technique, has been used to recover nitrogen and phosphorus from the domestic biological waste sludge. The study consists of two phases. In the first stage, nitrogen and phosphorus from biological waste sludge are recovered without the addition of chemical by PEF technique. In the second stage, the strüvite is obtained by MAP precipitation from liquid phase with high nitrogen and phosphore content. The optimum temperature, pH and precipitation time were determined as 20 °C, 9.5 and 24 hours, respectively for the formation of strüvite in the MAP precipitation tests. The best precipitate and removal efficiency was obtained to the sample with 2.5 ml of MgCl2.6H2O (0.015 M) and 2.5 ml of H3PO4 (0.049M). TN and TP removal efficiencies were obtained as 52% and 14% after precipitation. After sedimentation, crystalline precipitate formation was observed and XRD analysis revealed that this precipitate was struvite.
Alan : Mühendislik
Dergi Türü : Ulusal
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