hospital wastewater has special importance since having pathogens, radioactive materials, pharmaceutical wastes and heavy metals. removing them into environment without any treatment may cause serious problems for the public health. membrane biological reactor is the combination of the activated sludge and membrane filters. this research has investigated the performance of the nano-filtration i...

There are two basic reasons for the treatment of sewage, reuse and proper control wastewater water pollution, safeguarding public environmental health by protecting supplies preventing spread waterborne diseases. Proper design, construction together with good operation maintenance important authorities. In present study, a comprehensive design was developed units Inlet chambers sewage plants, t...

The start-up and performance of the completely autotrophic nitrogen removal via nitrite (CANON) process were examined in a sequencing batch reactor (SBR) with intermittent aeration. Initially, partial nitrification was established, and then the DO concentration was lowered further, surplus water in the SBR with high nitrite was replaced with tap water, and continuous aeration mode was turned in...

A technological system was developed for efficient nitrogen removal from real digester supernatant in a single reactor with shortened aeration to increase the economical aspects of wastewater treatment. The supernatant (600 mg TKN/L, low COD/N ratio of 2.2) was treated in batch reactors with aerobic granules (GSBRs) to test how one, two, or three non-aeration phases and acetate pulse feeding in...

The influence of aeration on algal growth and gamma-linolenic acid (GLA) production in a bubble column photobioreactor was investigated. Studies were performed in a 20-L reactor at different aeration rates (0.2- 2.5 vvm). Static, continuous, and periodic operation of air resulted in 41.9%, 88.4%, and 108% air saturation of dissolved oxygen, for which the corresponding values of GLA were 2.3, 6....

OBJECTIVES To evaluate that the cross-sectional area of the air space in the Eustachian tube (ET) on computed tomography (CT) images could be useful for predicting the postoperative aeration of the middle ear. METHODS The patient group consisted of 80 patients (80 ears) with chronic otitis media and who underwent middle ear surgery from 2006-2007 and who were followed up for more than 1 yr. T...

Live fish businesses are likely to become more popular in Nepal due their reliable source of food. The live food survey data was collected from a Google Form questionnaire the Nepalese language. This study investigates consumers, retailers, and wholesalers Nepal's market identify significant concerns that could be addressed decision-making professionals. Nonparametric tests used for non-normall...

ABSTRACT Wastewater treatment system by activated sludge, the purification of organic matter specific heterogeneous microorganisms, occurs in presence oxygen aeration tanks. The analysis microfauna present sludge is an important indicator performance and efficiency system. Considering this importance, objective work was to identify microorganisms which are part tank effluent plant a soybean pro...

Citric acid production is generally carried out in an aqueous medium stirred tank reactors (STR), where the solubility of oxygen low and demand microbial cultures high. Thus, for this bioprocess, providing adequate mass transfer rate (OTR) from gas phase into culture main challenge bioreactor selection operation. In study, citric by Yarrowia lipolytica W29 crude glycerol, batch cultures, was pe...