the properties of excess sludge wasted from two parallel pilot plants membrane bioreactor (mb-mbr and conventional mbr) have been monitored. sludge samples of mb-mbr and mbr have been examined and compared in terms of vss/tss, filtration index, eps and smp concentration, nitrogen and phosphorous in dry matter, fi, svi and polyelectrolyte requirement for sludge conditioning. by keeping similar o...

This paper discusses nitrogen removal mechanisms in an aerobic membrane bioreactor (MBR) treating high strength pet food wastewater characterized by oil & grease, COD, BOD5, TSS, TKN, NH4-N concentrations of 2800 mg/L, 25000 mg/L, 10000 mg/L, 4500 mg/L, 1650 mg/L and 1300 mg/L respectively. An MBR operating at SRT >25 days achieved mixed liquor total suspended solids (MLTSS) concentrations >300...

Bu çalışmada, tam aerobik ve düşük oksijen konsantrasyonlarında eş zamanlı nitrifikasyon-denitrifikasyon (SND) koşullarında, hastane atıksularını arıtan MBR sisteminin çevresel etkileri Yaşam Döngüsü Etki Analizi (YDEA) ile araştırılmıştır. Çalışma sonucunda, her iki koşulda da en yüksek etki tuzlusu ötrofikasyonunda gerçekleşmiştir. Tam koşullardan SND şartlarına geçildiğinde tatlısu ötrofikas...

Twenty-four children and young adults with electrocardiographic evidence of sinus node dysfunction (SND) are described. The patients, whose ages ranged from three days to 25 years, were divided into three groups based on the type of SND. Ten patients had persistent and inappropriate sinus bradycardia (group I): twelve patients had episodes of prolonged sinus arrest (group II); and seven patient...

In the developing brain, excessive neurites are actively pruned in the construction and remodeling of neural circuits. We demonstrate for the first time that the pruning of neurites occurs in the simple neural circuit of Caenorhabditis elegans and that a novel transcription factor, MBR-1, is involved in this process. We identified MBR-1 as a C. elegans ortholog of Mblk-1, a transcription factor...

The pacemaker cells of the cardiac sinoatrial node (SAN) are essential for normal automaticity. Dysfunction in pacemaking results human dysfunction (SND). SND more generally occurs elderly population and is associated with impaired function causing abnormal heart rhythm. Individuals have a variety symptoms including sinus bradycardia, arrest, SAN block, bradycardia/tachycardia syndrome, syncope...

Simultaneous nitrification denitrification (SND) has been referred to as a biological process for nitrogen removal where nitrification and denitrification occur concurrently in the same aerobic reactor. SND facilities, investigated in this study, have been shown to remove 80 to 96 percent nitrogen without additional carbon and alkalinity. Carbon availability and bulk dissolved oxygen (DO) conce...