Dynamics of Runoff Quality Associated with an Urban Park and WSUD Treatment Train in a Tropical Climate

Abstract Upgrading conventional single-stage mesophilic anaerobic digestion to an advanced digestion technology can increase sludge stability, reduce pathogen content, increase biogas production, and also increase ammonia concentrations recycled back to the liquid treatment train. Limited information is available to assess whether the higher ammonia recycle loads from an anaerobic sludge digestion upgrade would lead to higher discharge effluent ammonia concentrations. Biowin, a commercially available wastewater treatment plant simulation package, was used to predict the effects of anaerobic digestion upgrades on the liquid train performance, especially effluent ammonia concentrations. A factorial analysis indicated that the influent total Kjeldahl nitrogen (TKN) and influent alkalinity each had a 50-fold larger influence on the effluent NH3 concentration than either the ambient temperature, liquid train SRT or anaerobic digestion efficiency. Dynamic simulations indicated that the diurnal variation in effluent NH3 concentration was 9 times higher than the increase due to higher digester VSR. Higher recycle NH3 loads caused by upgrades to advanced digestion techniques can likely be adequately managed by scheduling dewatering to coincide with periods of low influent TKN load and ensuring sufficient alkalinity for nitrification.

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Recreation and Urban Park Planning: Problems and Prospects

Journal of Environmental Systems ◽

10.2190/9u3t-3lum-yu7l-rg52 ◽

1981 ◽

Vol 11 (4) ◽

pp. 315-323 ◽

Cited By ~ 1

Author(s):

Mike Moore ◽

Woodrow Jones

Keyword(s):

Urban Park ◽

Park Planning ◽

Planning Problems

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AMEBAS PATÓGENAS DE VIDA LIBRE DEL GÉNERO ACANTHAMOEBA EN AGUAS RECREATIVAS EN LA HUASTECA POTOSINA, MÉXICO

BIOCYT Biología Ciencia y Tecnología ◽

10.22201/fesi.20072082.2014.7.76134 ◽

2014 ◽

Vol 7 ◽

Author(s):

Ricardo Ortiz Ortega ◽

Alonso Vilches Flores ◽

Marco Aurelio Rodríguez Monroy ◽

Patricia Bonilla Lemus

Keyword(s):

High Temperature ◽

Water Body ◽

Tropical Climate ◽

Dry Season ◽

Thermal Waters ◽

Free Living ◽

Severe Infections ◽

Amebic Encephalitis ◽

Animal Tests

Studies accomplished in freshwater demonstrate the importance of identify the presence of protozoa like free living amoebae (FLA). In particular, the genera Acanthamoeba is associated with severe infections in man, as the Granulomatous Amebic Encephalitis (GAE). The most important factor for the development of these organisms is the high temperature of the water body. The region of the Huasteca Potosina in Mexico, with a tropical climate and great aquatic resorts, like rivers, waterfalls and pools of thermal waters, that allows the development of amoebae. In this study we evaluated the presence of amoebas in the most visited places on the Huasteca Potosina. Samples of a liter were taken in nine sites during the rainy and dry season. 54 strains of amoebas were identify, 46 belong to the genera Acanthamoeba, resulting 30 of them pathogenic in the animal tests. The pathogenic isolated amoebas were present in the most attended resorts by the people in the waterfalls or pools of the places sampling. Temperature turned out to be the most important factor for the presence of amoebae.

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