Highly selective and straightforward recovery of gold and platinum from acidic waste effluents using cellulose-based bio-adsorbent

Abstract A feasibility analysis of tertiary treatment for Organic Liquid Agricultural Waste is presented using filamentous algae belonging to the genus Cladophora sp. as an alternative to chemical tertiary treatment. The main advantages of tertiary treatments that use biological systems are the low cost investment and the minimal dependence on environmental variables. In this work we demonstrate that filamentous algae reduces the nutrient load of nitrate (circa 75%) and phosphate (circa 86%) from the organic waste effluents coming from dairy farms after nine days of culture, with the added advantage being that after the treatment period, algae removal can be achieved by simple procedures. Currently, the organic wastewater is discarded into fields and local streams. However, the algae can acquire value as a by-product since it has various uses as compost, cellulose, and biogas. A disadvantage of this system is that clean water must be used to achieve enough water transparency to allow algae growth. Even so, the nutrient reduction system of the organic effluents proposed is friendly to the ecosystem, compared to tertiary treatments that use chemicals to precipitate and collect nutrients such as nitrates and phosphates.

Download Full-text

Decolorization of Textile Waste Effluents by Ozonation

Journal of Environmental Systems ◽

10.2190/81u5-xgcn-gkfk-ua4x ◽

1991 ◽

Vol 21 (2) ◽

pp. 143-156 ◽

Cited By ~ 21

Author(s):

Sheng H. Lin ◽

Chi M. Lin

Keyword(s):

Textile Waste ◽

Waste Effluents

Download Full-text

HOSPITAL ENVIRONMENTAL AND RESIDUES MANAGEMENT: BRAZILIAN EXPERIENCES

Journal of Environmental Assessment Policy and Management ◽

10.1142/s1464333212500184 ◽

2012 ◽

Vol 14 (03) ◽

pp. 1250018 ◽

Cited By ~ 3

Author(s):

ERIC DORION ◽

ELIANA SEVERO ◽

PELAYO OLEA ◽

CRISTINE NODARI ◽

JULIO FERRO DE GUIMARAES

Keyword(s):

Public Health ◽

Environmental Management ◽

Waste Management ◽

Management Practices ◽

Hospital Waste ◽

Environmental Management Practices ◽

Hospital Effluents ◽

Waste Segregation ◽

Waste Effluents ◽

Responsible Attitude

Since Brazilian healthcare institutions have the duty to care about public health service, they also have the social and financial responsibilities to bring environmentally friendly practices and strategies, including principally a responsible attitude towards hospital waste management. Negligent waste management contributes significantly to polluting the environment. Today, a specific regional context in the southern State of Rio Grande do Sul, Brazil, shows an ambivalent situation in terms of hospital waste management. This study aims to analyze the environmental management practices and innovation strategies of the hospitals of the Serra Gaúcha region, as well as conducting a comparison between the environmental management practices versus the current Brazilian laws. Based on data analysis, it was found that all hospitals employ the practice of waste segregation, preserving public health and environmental quality. However, in respect to hospital waste effluents, 75% of the hospitals of the Serra Gaúcha region do not treat their hospital effluents, not complying with the current Brazilian legislation.

Download Full-text