Esparza Torres, Félix, asesor Espinosa Solares, Teodoro, asesor González Rangel, María del Carmen, dir. text drama monographic d

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Disponible en PDF 1 ej. imp. ; 2 ej. CD Aguas residuales Chemical oxygen demand Demanda química de oxígeno Sewage Tratamiento de agua residual México Chapingo Wastewater treatment Mexico Chapingo 186155 220117 IA_Because the COD test is important it can´t be omitted, it uses digester and catalyst solutions, which contain chromium (Cr), silver (Ag) and mercury (Hg), therefore, the residue obtained will contain these heavy metals in high levels, the concentration of these metals exceeds by far the maximum permissible limits established by mexican regulation, this liquid waste is considered hazardous according to NOM-052-SEMARNAT-2005.