Method for processing wastewater with high content polyvinyl alcohol

A polyvinyl alcohol, high-content technology, applied in chemical instruments and methods, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc. The problems of increasing the use cost of the filter membrane and easily blocking the ultrafiltration membrane can achieve the effect of improving the recycling rate, lowering the cost and reducing the cost.

Inactive Publication Date: 2013-04-17
TONGXIANG JIANMIN FILTER MATERIALS
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Problems solved by technology

At the same time, although the polyvinyl alcohol content in the aforementioned waste water is huge, it still cannot be easily extracted from the waste water. Designed to recover polyvinyl alcohol, the main method is to further increase the concentration of polyvinyl alcohol by ultrafiltration, and then process to extract polyvinyl alcohol
However, this method cannot be applied to industrial wastewater treatment and recovery, because polyvinyl alcohol is a viscous substance, which can easily block the ultrafiltration membrane, resulting in a very long ultrafiltration process, and the use cost of the ultrafiltration membrane is greatly increased.

Method used

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Embodiment 1

[0008] The method for the treatment of high-content polyvinyl alcohol waste water described in the present embodiment, the method comprises the following steps: (1) add the sodium sulfate of 0.5-3.0% weight ratio and the sodium chloride of 0.5-3.0% weight ratio in waste water, sulfuric acid Sodium and sodium chloride reduce the solubility of polyvinyl alcohol in water as a salting-out agent, so that most of the polyvinyl alcohol dissolves into a suspended state, but does not form a precipitate at this time, and cannot achieve the effect of removing polyvinyl alcohol; (2) a Hours later, the polyvinyl alcohol is dissolved into fibrous form, and 0.05-0.30% by weight of borax is added, and sodium hydroxide is added to adjust the pH value of the wastewater to 8-9. In a weakly alkaline environment, borax and polyvinyl alcohol are crosslinked to produce The double glycol structure makes the single polyvinyl alcohol fibers slowly flocculate together. At this time, the flocculent polyvi...

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Abstract

The invention which mainly aims to solve technical problems existing in the prior art provides a method for processing wastewater with high content polyvinyl alcohol. The method comprises the following steps: 1, 0.5-3.0 wt% of sodium sulfate and 0.5-3.0 wt% of sodium chloride which are used as salting-out agents are added to the wastewater to reduce the solubility of polyvinyl alcohol in the wastewater and dissolve partial polyvinyl alcohol out, and the partial polyvinyl alcohol is suspended; 2, one hour later, the partial polyvinyl alcohol is fibrous in shape, 0.05-0.30 wt% of borax is added, sodium hydroxide is added to adjust the pH value of the wastewater to 8-9, a didiol structure is generated through crosslinking borax with polyvinyl alcohol under weak alkaline environment to slowlyflocculate single polyvinyl alcohol fibers; and 3, three hours later, 0.05-0.30 wt% of aluminum chloride is added when the polyvinyl alcohol fibers are flocculated into a cluster to make the flocculated polyvinyl alcohol fibers acceleratedly settle, wherein aluminum chloride is used as a precipitating agent.

Description

technical field [0001] The invention belongs to the technical field of wastewater treatment, and in particular relates to a method for treating wastewater with high content of polyvinyl alcohol. Background technique [0002] In the prior art, in the recycling process of special paper added with polyvinyl alcohol as a strengthening agent, the method of hot water cooking is used to recycle the plant fibers in the scraps of special paper, and the waste water after cooking contains a large amount of polyvinyl alcohol (6-10g / l), the COD value is as high as 6000-15000, direct discharge will cause serious pollution; directly into the papermaking water circulation system, it is easy to cause the water quality of papermaking water to deteriorate, and the bonding effect of polyvinyl alcohol also affects production stability and product quality. Polyvinyl alcohol has a 1,3-ethylene glycol structure and is a non-ionic organic polymer. The adsorption effect of the charge on it is very w...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/04C02F101/34
Inventor 吴素花杜宝山张伯坤肖坤杨树学方明
Owner TONGXIANG JIANMIN FILTER MATERIALS
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