scholarly journals MEJORAMIENTO DE LA CALIDAD MICROBIOLÓGICA DE BIOSÓLIDOS GENERADOS EN PLANTAS DE TRATAMIENTO DE AGUAS RESIDUALES DOMÉSTICAS (MICROBIOLOGICAL QUALITY IMPROVEMENT OF BIOSOLIDS FROM DOMESTIC WASTEWATER TREATMENT PLANTS)

Revista EIA ◽  
2013 ◽  
Vol 6 (11) ◽  
pp. 21
Author(s):  
Patricia Torres ◽  
Carlos Madera ◽  
Jorge Silva
Keyword(s):  
Wastewater Treatment ◽  
Wastewater Treatment Plants ◽  
Treatment Plant ◽  
Microbiological Quality ◽  
Domestic Wastewater ◽  
Nutrient Content ◽  
Pilot Scale ◽  
High Concentration ◽  
Domestic Wastewater Treatment ◽  
Class B

Uno de los principales problemas de calidad que presentan los biosólidos de plantas de tratamiento de aguas residuales domésticas –PTAR– es el contenido de microorganismos patógenos que los clasifica en muchos casos como Clase B con restricción para uso agrícola. Este estudio evaluó la estabilización alcalina de los biosólidos de la PTAR Cañaveralejo (Cali, Colombia) para mejorar su calidad microbiológica, empleando dos tipos de cal (hidratada y viva) en dosis entre 8 y 25 % y dos tipos de ceniza con dosis entre 8 y 40 % en unidades experimentales de 0,2 m2 con un tiempo de contacto de 13 días. Los resultados mostraron que con cal se logró reducción total de las variables de respuesta evaluadas (coliformes fecales, Salmonella sp y huevos de helmintos), mientras que el poder alcalinizante de las cenizas evaluadas fue insuficiente. El biosólido higienizado con cal presenta alto potencial de uso agrícola por su calidad microbiológica y por el contenido final de materia orgánica y nutrientes (N, P) que pueden beneficiar los suelos, pero es recomendable evaluar la optimización a escala piloto de la dosificación de cal y la aplicación del biosólido en diferentes tipos de suelos y cultivos para precisar los beneficios o medidas preventivas antes de la aplicación.Abstract: One of the main quality problems of biosolids from domestic wastewater treatment plants –WWTP– is the high concentration of pathogens, often classified as a class B, with restriction for use in agriculture. This study evaluated the alkali stabilization of biosolids from Cañaveralejo wastewater treatment plant (PTAR-C), located in Cali, Colombia, in order to improve their microbiological quality using two types of lime (quick and hydrated) with doses between 8 to 25 % and two types of ash with 8 to 40 % as doses, in experimental units 0,2 m2with 13 days of contact time. The results showed that both type of lime reached the total reduction of evaluated monitoring variables (faecal coliforms, Salmonella sp, helmints eggs) while the alkali power of ashes were lower. The obtained biosolids treated with lime have a high potential use in agriculture purposes for the good microbiological quality, and for the organic matter and nutrient content (N, P) that can generate benefit to the soil, but it is recommendable to evaluate at pilot scale the lime doses and application of biosolid in different soils types and crops in order to precise the benefits or prevent measurements before application of material in soil.

Study of the Factors Affecting Activated Sludge Settling in Domestic Wastewater Treatment Plants

1992 ◽  
Vol 25 (4-5) ◽  
pp. 273-279 ◽  
Author(s):  
E. Echeverría ◽  
A. Seco ◽  
J. Ferrer
Keyword(s):  
Wastewater Treatment ◽  
Pilot Plant ◽  
Wastewater Treatment Plants ◽  
Treatment Plant ◽  
Domestic Wastewater ◽  
Factors Affecting ◽  
Sulphide Concentration ◽  
Domestic Wastewater Treatment ◽  
Sludge Settling ◽  
Settling Characteristics

A study has been made of the influence of the process parameters on the settling characteristics of sludge in domestic wastewater treatment plants. The experiments were conducted at a pilot plant situated at the Wastewater Treatment Plant of Valencia, Spain (1,000,000 inhabitants). The influent to the pilot plant was the same as that of the plant. It was found that F/M ratios in the range of 0.25-0.60 g DBO5/g MLVSS day produce values of SVI representative of good settleability of the sludge. Values of sulphide concentration in the influent above 1.0 mg/l negatively affect the process, causing bulking and floating sludge. High values of fats were found to have no influence on the SVI, but did affect the performance of depuration. At low DO levels, the appearance of bulking with high SVI values was observed. Throughout the experiments, the permanence of nutrients (basically N and P) above that required for the growth of the microorganisms was proved.

scholarly journals Determination on inhibition effects of coagulants used in wastewater treatment plants on anaerobic digester

2020 ◽  
Vol 82 (9) ◽  
pp. 1877-1884
Author(s):  
Güler Türkoğlu Demirkol ◽  
Gökhan Balcıoğlu ◽  
Nurtaç Öz ◽  
Moiz Elnekave ◽  
Bülent Armağan ◽  
...  
Keyword(s):  
Wastewater Treatment ◽  
Suspended Solids ◽  
Wastewater Treatment Plants ◽  
Settling Tank ◽  
Treatment Plant ◽  
Oxygen Demand ◽  
Domestic Wastewater ◽  
High Concentration ◽  
Biological Methods ◽  
Solids Removal

Abstract Domestic wastewaters causing pollution contain inorganic and/or organic materials. When the domestic wastewater outflows to the receiving waters, it causes physical, chemical, and biological pollution in them, and deteriorates the ecological balance of those waters. In the treatment of wastewater, various treatment methods are available depending on the pollution strength of the wastewater. Besides mechanical and biological methods, wastewater treatment with physicochemical methods is still one of the most effective and economical options. Particularly in wastewater with a high concentration of suspended solids, this method is very successful, and obtaining high suspended solids removal efficiencies is very possible. In this study, the effects of the use of coagulant and coagulant aid to be used in a treatment plant where domestic wastewater treatment is carried out are determined to increase the treatment efficiency of a biological treatment that comes later in the stages of the treatment. The effluent of the pre-settling tank may contain a lot of suspended solids. This presence of excess suspended solids decreases the efficiency at other levels of treatment and causes energy loss. In the experiments, the standard jar and inhibition tests are done as a method. As a result of the conducted studies, it is determined that the FeCl3, Synthetic coagulant LP 526, FeClSO4, and the combination of anionic polyelectrolyte yield the best results in the removal of the parameters of chemical oxygen demand (COD), total suspended solids (TSS), and volatile suspended solids (VSS). While FeCl3, APE 65, APE 85, Synthetic coagulant LP 526, and FeClSO4 did not show any inhibition effect in the sludge, APE 67, CPE 84, and (Al2(SO4)3 are found to cause inhibition in the sludge.

Volatile organic compound emissions during the composting of biosolids from a domestic wastewater treatment plant

2002 ◽  
Vol 46 (10) ◽  
pp. 195-198 ◽  
Author(s):  
C.X. Ramos ◽  
S.L. Estévez ◽  
E. Giraldo
Keyword(s):  
Wastewater Treatment ◽  
Wastewater Treatment Plant ◽  
Solid Phase ◽  
Treatment Plant ◽  
Domestic Wastewater ◽  
Aeration System ◽  
Domestic Wastewater Treatment ◽  
Emission Behavior ◽  
Volatile Organic Compound Emissions ◽  
Aliphatic And Aromatic Hydrocarbons

VOCs emitted by two composting static piles of biosolids coming from the “El Salitre” wastewater treatment plant (Bogotá, Colombia) were analysed during the composting process. Each pile in its sampling time was maintained with a different aeration system. The sampling was made using Solid Phase Microextraction (SPME); separation and identifications were made using Gas Chromatography (GC) coupled to Mass Spectrometry (MS). Aliphatic and aromatic hydrocarbons, chlorinated compounds, ketones, mercaptans, alcohols and amines were identified in concentrations greater than the norms stipulated by the EPA for inhalation in humans beings. The emission behavior varied according to the aeration system used.

Sign in / Sign up

Export Citation Format

Share Document