Over the past decade, the environmental impact of wastes discharged from high-density flow-through fish-production systems has been viewed with increasing concern. Recirculating aquaculture systems are gaining wider acceptance because of their ability to reduce waste discharges, improve quality control, and reduce costs. The crucial processes that must be addressed in treating recirculating wat...

The dewatering process reduces the water quantity in sludge, allowing decrease its volume, which facilitates storage, transport, stabilization, and improves post-treatment efficiency. Chemical polymers including aluminum sulphate polyaluminum chloride were applied as flocculants conditioning order to prepare sludge for dewatering. However, these synthetic may cause risks human health, should be...

Carbon storage in soil increases along with remediation of post-mining soils. Despite many studies on the issue carbon sequestration soils, there is a knowledge gap potential and mechanisms C areas. This research, including nuclear magnetic resonance analysis, determines organic formation progress long-term study limestone (S1), lignite (S2) under different stages. The main target reforesting; ...

Abstract This article discusses and analyzes modern technologies for the waste disposal from municipal treatment facilities according to ecological point of view. A review current their indicates that they have a valuable resource potential due high content organic substances mineral components. Thermal biological methods utilization are considered. The advantages disadvantages recycling specif...

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...

The main objective of this study was to investigate the rheology of mixed primary and secondary sludge and its dependency on solid content and temperature. Results of this study showed that the temperature and solid concentration are critical parameters affecting the mixed sludge rheology. It was found that the yield stress increases with an increase in the sludge solid content and decreases wi...