Viabilidade da Disposição de Lodo Secundário da Ete de Araraquara (SP) em Argissolo Vermelho

No tratamento de águas residuárias o acúmulo de materiais sólidos (lodo) é comumente verificado ao final dos processos, cuja disposição apresenta-se como problemática e dispendiosa. Dentre as formas de reaproveitamento do lodo ou biossólido gerado nas estações de tratamento de esgotos (ETEs), destaca-se a aplicação agrícola, permitindo a reciclagem de matéria orgânica e nutrientes ao meio. Baseando-se nos potenciais impactos associados ao descarte do biossólido em solos, os efeitos da aplicação do lodo da ETE do Município de Araraquara (SP) em solo do tipo argissolo vermelho foram avaliados. Desta forma, tanques (lisímetros) com o solo estudado foram construídos e doses distintas de lodo – 500 e 1500 gramas de sólidos totais (ST) por m2 – foram aplicadas em cada tanque. Os lisímetros ficaram expostos às condições ambientes e foram monitorados por aproximadamente quatro meses. Cinco aplicações acumulativas de lodo foram realizadas durante 90 dias. As águas de chuva infiltradas nos tanques foram analisadas para detecção de metais e patogenicidade. A composição química de gramíneas eventualmente germinadas nos tanques também foi analisada para detecção de metais e seu poder nutricional. As análises indicaram a ausência de organismos patogênicos nas águas percoladas. Quanto aos teores de metais na água, os valores obtidos foram superiores ao limite de detecção do equipamento utilizado e inferiores aos limites máximos permitidos para classificação de águas doces classe I. Além disso, um acréscimo na fertilidade do solo ao final das aplicações foi observado. Assim, verificou-se que o lodo amostrado apresenta potencial para reuso agrícola, ressaltando-se a necessidade da aplicação das doses recomendadas pela legislação vigente e do monitoramento periódico das areas aplicadas.

Doses de lodo de esgoto compostado em produção de tapete de grama esmeralda imperial

The efficiency of nitrogen fertilization for sod production can be increased by using slow-release sources such as sewage sludge compost, which, due to its characteristics can be a substitute of part or all inorganic fertilization for grass. No results were found for the use of sludge compost in sod production in Brazil. This study evaluated the effect of rates of sewage sludge compost on the production of zoysiagrass. Treatments consisted of five rates of composted sewage sludge compost (0, 12, 24, 36 and 48 Mg ha-1, on a dry basis), plus a treatment of inorganic fertilization (300 kg ha-1 N, 80 kg ha-1 P2O5, and 200 kg ha-1 K2O). The results indicated different mineralization rates of the organic compounds present in the sludge; 120 days after sludge application, more Mg (100 %), K (90 %) and N (67 %) has been released than S (57 %), P (40 %) and Ca (31 %). The use of composted sewage sludge for zoysiagrass adequately supplied nutrients when applied to the soil surface at rates more than 36 Mg ha-1. After sod cutting, the rates of sewage sludge compost provided a linear increase in potential soil acidity, soil contents of OM, P, S, Fe, Cu, Mn, Zn, Cu and Ni, and linear decrease in pH, soil concentration of Ca and Mg and base saturation. Compost rates, increasing from 0 to 48 Mg ha-1, reduced the sod mass, reaching values of 4.0 kg/sod at the highest rate. High compost doses (36 and 48 Mg ha-1, respectively) also induced the highest resistance, with values in the order of 35 and 33 kgf.

Níquel em solo e plantas de milho cultivadas em área tratada com lodo de esgoto durante 15 anos consecutivos

Pós-graduação em Agronomia (Ciência do Solo) - FCAV

Manejo do lodo de esgoto e nitrogênio mineral na fertilidade do solo ao longo do tempo

The use of sewage sludge is a practice highly promising for the development of sustainable agricultural systems. The objective of this study was to assess the improvement in soil fertility management strategies on different sewage sludge and mineral nitrogen after seven application of this residue. The experiment was carried at the Sao Manuel Experimental Farm belonging to the faculty of Agronomic Sciences of UNESP, Botucatu, located in the county of Sao Manuel. It was adopted the experimental design in a randomized blocks consisting of six treatments and five repetitions defined as follows: T0 - without nitrogen fertilizer, T1 - mineral fertilizer nitrogen according to the crop needs, T2 - 50% nitrogen from sewage sludge and 50% in the form of chemical fertilizer, T3 - 100% of nitrogen recommended by the culture, from sewage sludge, T4 - 150% of nitrogen recommended by the culture, from sewage sludge and T5 - 200% of the nitrogen from the sewage sludge. It has done seven application of sewage sludge in crop ( year 1 - sunflower, year 2 sunflower, year 3 - oats and bean, year 4 - triticale and sunflower, year 5 - wheat) and the first three applications were treated with sewage sludge and the other applications were composted sludge. In the depth 0-20 cm, the sewage sludge promoted an increase in levels of organic matter, P, S, H+Al, CEC and decreased in soil pH. In the depth of 20 to 40 cm the sewage sludge promoted a decrease in pH and increase in soil organic matter, P, H+Al, K, Ca, SB, CEC and S. Mineral N influence the increase in the depth S of 20-40 cm.

Cádmio, cobre e cromo em solo e plantas de milho após quinze anos de aplicações anuais de lodo de esgoto

Pós-graduação em Agronomia (Produção Vegetal) - FCAV

Utilização de lodo de esgoto na produção de mudas de aroeira-pimenteira

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Aplicações sucessivas de lodo de esgoto no girassol e efeito residual no trigo e triticale

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Remoção do ácido mefenâmico em água utilizando carvão ativado em pó, lama vermelha e oxidação com cloro

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Elementos-traço em dois latossolos após aplicações anuais de lodo de esgoto por treze anos

This experiment aim was to evaluate the contamination of the trace elements (TE) arsenic, barium, cadmium, chromium, copper, mercury, molybdenum, nickel, lead, selenium, and zinc considered in the CONAMA resolution 375 after 13 years long using sewage sludge (SS) as fertilizer in two soils: an Eutroferric Clayed Red Latosol (Rhodic Eutrudox - RE) and a Dystrophic Red Latosol (Typic Haplorthox - TH). Experiment in the field under maize cultivation had four treatments (0, 5, 10, and 20 t of SS ha(-1), dry weight), five replications and an experimental design in randomized blocks. The agrochemicals (dolomitic limestone, single superphosphate, and potassium chloride), SS, soils, and the certified reference materials were digested according to the USEPA 3051A method and the chemical elements were quantified by ICP OES. The TE contents found in the agrochemicals used should not cause immediate environmental impact. The higher TE values were found in the RE and they did not reach the agricultural (more stringent) Investigation Level (IL) yet, according to 420 CONAMA resolution. Persisting the actual SS fertilization amount applied in the soil and the TE concentration in the SS is foreseen that Ba, Cd, Cr, Cu, Ni, and Zn will be the first elements to reach the IL in the RE.

Incorporação do lodo da estação de tratamento de água (ETA II) do município de Rio Claro-SP, na argila, para produção de cerâmica vermelha

The slugde from decanters in Water Treatment Plants (WTP) has different composition varying, according to the region, coagulant type and dosages, the plant layout. In this work, the physical characterization of the sludge generated from decenties (ETAII the municipality of Rio Claro, Brazil), the manufacture of bodies of evidence-sludge mixture of clay (with humidity of 8% and concentrations of sludge, 5, 15 and 30%) the testing technology after burning the mixture to a temperature of 950 ° C were investigated. The main aim assess the possibility of its use as raw material in the ceramic red production. For comparison of the obtained results it was used values of the testing technology of bodies of evidence only with clay, prepared under the same conditions. In general, the addition of sludge from ETA made worse the properties of the ceramic body, however, the values obtained from the tests on the concentration of 5% of sludge, still remain within the acceptable limits for the production of red pottery pieces.

Projeto de um sistema anaeróbico para estabilização de lodo e recuperação de energia

The treatment of domestic and industrial effluents through Wastewater Treatment Plants (WTPs) generates a residue termed sewage sludge, rich in organic matter, high-volume, occasionally containing pathogens and heavy metals. The sludge generation can minimize the benefits brought by the treatment of sewage, because this residue does not always receive appropriate treatment before final disposal. The disposal is another problem related to sludge. Landfills generally does not have physical space and alternatives such as the use in agriculture requires an intense treatment that could be in many cases operational or economic unfeasible. The objective of this work is the theoretical research about the processes of stabilization of the sludge by anaerobic digestion and the methanogenic activity during the process. Through analysis of each step and contemplating each relevant factor in anaerobic digestion process in order to optimize them, we proposed a theoretical model of reactors capable of stabilize the sludge, reduce its volume and eliminate pathogens. The obtained configuration consists of two anaerobic reactors connected in series. The first one operates in the range mesophilic temperature (35 ° C) and has higher hydraulic retention time (25 days) working primarily in the stabilization of organic matter present in the sludge and producing biogas, whereas the second one operates in the thermophilic range (55 ° C) in order to eliminate pathogens, and to reduce the volume. The hydraulic retention time in the second reactor is lower (10 days). Both mesophilic and thermophilic processes were efficient in what was proposed, promoting the stabilization of organic matter present in the sludge and significant reduction of pathogens. As a final step with the sludge previously digested, it is indicated a final dehydration... (Complete abstract click electronic access below)

Análise do potencial bioindicador do diplópodo Rhinocricus padbergi exposto a substrato contendo lodo de esgoto por meio de estudos histológico e histoquímico do tubo digestivo

Não disponível

Avaliação da toxicidade de lodo de esgoto utilizando a análise morfológica do intestino médio do diplópodo Rhinocricus padbergi como biomarcador

Não disponível

Desidratação de lodo proveniente de ETA através de tubos geotexteis

Currently exists a growing concern for the preservation of the environment Around the world, the environmental awareness in Brazil has strengthened during the past two decades. This concern in Brazil arises from the creation of mechanisms of supervision and punishment on the part of the environmental agencies. In order to meet the pertinent legislation many public and private companies have performed dehydration of waste generated in the process of treatment of industrial effluents, waste water and water treatment in order to reduce transport and disposal costs. The use of geotextile tubes has proven technically and economically feasible to be applied in various situations from water treatment to mining tailings. This work presents the solution adopted for an environmental liability in water treatment plant through the use of geotextile tubes to reduce the water content of the disposal. We evaluated the size distribution curves, Atterberg limits, and chemical composition of the residue. Found high concentrations of aluminum in the waste which would characterize environmental pollution if disposed off directly in nature with no treatment

Avaliação da atenuação da toxicidade de lodo de esgoto por associação com resíduo vegetal da indústria sucro-alcooleira

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)