RU94040419A - Method for purification of sewage
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Method for purification of sewage
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Publication number
RU94040419A
RU94040419ARU94040419/25ARU94040419ARU94040419ARU 94040419 ARU94040419 ARU 94040419ARU 94040419/25 ARU94040419/25 ARU 94040419/25ARU 94040419 ARU94040419 ARU 94040419ARU 94040419 ARU94040419 ARU 94040419A
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Application filed by Л.И. БельчинскаяfiledCriticalЛ.И. Бельчинская
Priority to RU94040419ApriorityCriticalpatent/RU2084404C1/en
Publication of RU94040419ApublicationCriticalpatent/RU94040419A/en
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Publication of RU2084404C1publicationCriticalpatent/RU2084404C1/en
FIELD: chemistry, wood processing industry. SUBSTANCE: method involves sustaining sewage and separation in into resin and supernatant fraction. Acid granulated clay sorbent is added into said supernatant fraction, liquid fraction being separated. Then distillation is carried out at pH 9.0-10.0 within definite temperature range. Thus methanol fraction which contains methanol (its quantity being not less 95 %), aqueous condensate with pH 8.0-9.5, urotropin (its quantity being not more 80 mg/l) and formaldehyde (its quantity being 0.5 mg/l) is prepared. EFFECT: improves efficiency of the method.
Claims (1)
Изобретение относится к химии и может быть использовано в деревообрабатывающей промышленности в качестве природоохранных мер, направленных на очистку сточных вод от формальдегида и метанола. Способ включает выдерживание сточных вод до разделения их на смоляную и надсмольную фракции, введение в надсмольную фракцию кислого гранулированного глинистого сорбента, отделение жидкой фракции и проведение отгонки при рН 9 - 10 в определенном температурном режиме. В результате образования метанольной фракции с содержанием метанола не менее 95%, водный конденсат с рН 8,0 - 9,5 содержит уротропина не более 80 мг/л, метанола 20 мг/л, формальдегида 0,5 мг/л, куб второй ступени содержит сульфат аммония до 40 %.The invention relates to chemistry and can be used in the woodworking industry as environmental measures aimed at the treatment of wastewater from formaldehyde and methanol. The method includes maintaining the wastewater before separating them into a tar and tar resin fraction, introducing an acid granular clay sorbent into the tar resin fraction, separating the liquid fraction and conducting distillation at pH 9-10 in a certain temperature regime. As a result of the formation of a methanol fraction with a methanol content of not less than 95%, an aqueous condensate with a pH of 8.0 - 9.5 contains urotropine not more than 80 mg / l, methanol 20 mg / l, formaldehyde 0.5 mg / l, cube of the second stage contains ammonium sulfate up to 40%.
RU94040419A1994-10-311994-10-31Method for treating waste water
RU2084404C1
(en)