Subterranean ecosystems harbor globally rare fauna and important water resources, but ecological processes are poorly understood and are threatened by anthropogenic stresses. Ecosystem analyses were conducted from 1997 to 2000 in Cave Springs Cave, Arkansas, situated in a region of intensive land use, to determine the degree of habitat degradation and viability of endangered fauna. Organic matt...

A survey of septic tank design shows that short-circuiting is minimized and effluent quality is improved when quiet, laminar, fluid-flow is encouraged, such as in long, narrow tanks with little hydraulic ‘dead space’. Longitudinal partitions provide better solids retention by providing longer travel distance, but transverse partitions are advantageous only when the opening between compartments ...

although dental foci can be sources of bacteremia and bacterial endocarditis, hematogenous spread of infection presented with septic pulmonary embolism apparently is rare. the occurrence of septic pulmonary embolism in patients with periodontal disease without suppurative thrombophlebitis of the great vessels of the neck is well documented but to our knowledge, there is no report on septic pulm...

India is a country where Atomic Age and near Stone Age people co-exist. On one hand India has achieved development in many areas, but on the other hand there is still the practice of open defecation and manual cleaning of human excreta from bucket privies by scavengers. National sanitation coverage is only about 34% meaning that 66% of the population practises open defecation. Such unhygienic c...

Effluent discharge from septic tanks is affecting the environment in developing countries. The most challenging issue facing these countries is the cost of inadequate sanitation, which includes significant economic, social, and environmental burdens. Although most sanitation facilities are evaluated based on their immediate costs and benefits, their long-term performance should also be investig...

This paper presents three new approaches to reduce excess sludge production in activated sludge systems: 1) modification of conventional activated sludge process with insertion of a sludge holding tank in the sludge return line; 2) chlorination of excess sludge so as to minimize excess sludge production; and 3) utilization of a metabolic uncoupler, 3, 3', 4', 5-Tetrachlorosalicylanilide (TCS) t...

conclusions this phenomenon has been reported as a rare complication of septic arthritis and osteomyelitis. treatment of these patients is controversial and the long term results are unknown but efforts must be done for early diagnosis and anatomic reduction of femoral epiphysis. introduction slipped capital femoral epiphysis (scfe) is one of the complications of septic arthritis that occurs ra...

Alternate cycling of sludge in aerobic, anoxic, and anaerobic regimes is a promising strategy that can reduce the sludge yield of conventional activated sludge (CAS) by up to 50% with potentially lower capital and operating cost than physical- and/or chemical-based sludge minimisation techniques. The mechanisms responsible for reducing sludge yield include alterations to cellular metabolism and...

The literature on reduction of excess sludge production by ozonation is summarized. Two sequencing batch reactor experiments where sludge is ozonated for this purpose are performed. The purpose of these is to evaluate the prospects of using ozonation to reduce excess sludge production in two different kinds of sludge. Urban sewage sludge is used in the first, and paper mill sludge in the second...