METHOD OF WASTE WATER CLEANING FROM CELLULOSE NITRATES
FIELD: treatment facilities. ^ SUBSTANCE: invention may be used during cellulose nitrates production by periodic, continuous or combined technology. The method of waste water cleaning from cellulose nitrates provides for waste water collecting, desired product extracting from the said waste water an...
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Zusammenfassung: | FIELD: treatment facilities. ^ SUBSTANCE: invention may be used during cellulose nitrates production by periodic, continuous or combined technology. The method of waste water cleaning from cellulose nitrates provides for waste water collecting, desired product extracting from the said waste water and product returning back to production process. Finally, the product is treated to finished product quality. The waste water resulting from the production process is subject to preliminary and final cleaning against process stages. Pre-cleaning is performed as one-stage process. At the end the extracted product is returned to treatment to the same process stage as a water suspension under concentrations to 10-50 kg/m3. Final waste water cleaning, i.e. after-treatment is conducted in two stages. The water suspension extracted at the first stage under concentrations to 3-6 kg/m3 is returned back to the own process stage, whereas the other water suspension extracted at the second stage is mixed up with waste water to be supplied to after-treatment. Applying cleaning method under industrial conditions will increase waste water treatment effectiveness to 97Ç99%, sharply reduce irretrievable losses of cellulose nitrates and minimise their entrainment by waste water into environment. In addition, the above method provides for waste water recycling under industrial conditions in any amounts. ^ EFFECT: invention allows for producing low-quality cellulose nitrates in the form of separate trapping batch and improving quality of cellulose nitrates and economic feasibility of production process. ^ 8 cl, 1 dwg, 3 tbl
Изобретение может быть использовано при получении нитратов целлюлозы по периодической, непрерывной и комбинированной технологии. Способ очистки сточных вод от нитратов целлюлозы включает сбор сточных вод, извлечение из них целевого продукта, возврат в производство и последующая его переработка в продукцию. Образующиеся в ходе технологического процесса сточные воды подвергают предварительной и окончательной очистке по технологическим стадиям. Предварительную очистку осуществляют в одну ступень с возвратом извлеченной продукции на переработку на свою же технологическую стадию в виде водной взвеси с концентрацией до 10-50 кг/м3. Окончательную очистку - доочистку сточных вод проводят в две ступени с возвратом выделенной с первой ступени водной взвеси с концентрацией до 3-6 кг/м3 на свою же технологическую стадию, а извлеченную водную взвесь со второй ступени смешиваю |
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