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The wastewater of the processing of cassava's flour (manipueira) was submitted to the anaerobic treatment in two phases: acidogenic and methanogenic. In the acidogenic phase, the wastewater was stabilized with NaOH (ASH) and with limestone (ASL). After that, both stabilized effluents were treated by a methanogenic reactor. Then, the effluent of the methanogenic reactor was used as fertilizer on maize in the initial growth stage (30 days), cultivated in pots in a greenhouse. The treatments were T1: control without urea addition (only N from soil); T2: NPK (2.2 g of urea with 45% of N); T3: ASH (84 mL.kg soil-1); T4: ASL (102 mL.kg soil-1); T5: double dose ASH (168 mL.kg soil-1) and T6: double dose ASL (204 mL.kg soil-1). Each treatment was composed by 4 plants/pot in five repetitions. It was observed that all the treatments with stabilized wastewater had favorable effect to the soil pH (> than 7.5) and basis saturation (V%) in the soil around to 90%. The performances of nitrogen absorption by the maize plants were 64, 54, 80 and 78% for T3, T4, T5 and T6, respectively. A água residuária do processamento de farinha de mandioca (manipueira) foi submetida ao tratamento anaeróbio em duas fases: acidogênica e metanogênica. Na fase acidogênica, a água residuária foi estabilizada com NaOH (ASH) e com calcário (ASL). Em seguida, ambos efluentes estabilizados foram tratados por um reator metanogênico. Então, o efluente do reator metanogênico foi usado como fertilizante no milho no estádio inicial de crescimento (30 dias) cultivado em vaso em casa de vegetação. Os tratamentos foram T1: controle sem uréia (somente N do solo); T2: NPK (2,2 g de uréia com 45% de N); T3: ASH (84 mL.kg solo-1); T4: ASL (102 mL.kg solo-1); T5: dose dupla de ASH (168 mL.kg solo-1) e T6: dose dupla de ASL (204 mL.kg solo-1). Cada tratamento foi composto por 4 plantas/vaso com 5 repetições. Foi observado que todos os tratamentos com á água residuária estabilizada tiveram efeitos favoráveis ao pH do solo (> que 7,5) e saturação de bases (V%) no solo ao redor de 90%. A eficiência de absorção de nitrogênio pelas plantas foram 64%, 54%, 80% e 78% para T3, T4, T5 e T6, respectivamente

Use of cassava wastewater treated anaerobically with alkaline agents as fertilizer for maize (Zea mays L.)