SU1214612A1 - System for purifying sewage - Google Patents

Description

2. System: according to claim 1, which differs from the fact that, in order to purify wastewater from mechanical impurities that leaves the press section of the boom, the system

The invention relates to wastewater treatment and is intended to create a closed cycle of water circulation, excluding pollution of waste water by specific production components, and can be applied in pulp and paper, chemical and other industrial sectors, where water soluble polypsichlorohydrin resins enter the wastewater.

The purpose of the invention is to increase the degree of wastewater treatment by reducing the content of water-soluble polyepichlorohydrin resins in the latter and utilizing waste reagents.

The drawing shows a diagram of the proposed system.

The system includes a paper machine pool 1, a mass cleaning unit 2, a grid part 3 of a paper machine, a press part 4, a drying and finishing part 5, register water collection 6, excess water collection 7, a sump 8 for clarifying recycled water, node 9 for demineralizing clarified water , a collection of 10 demineralized clarified water, a mixer 11 of water with bentonite, a mixer 12 of water with a flocculant, a sump 13 for separating the solid phase, a collection 14 of purified purified water.

The press part 4 is connected to a pile containing water purification device, including a pile containing water collection 15 and a pile containing water clarification device 16, which is connected to a mixer 1I.

The system works as follows.

Registered water from collector 6 is fed to the dilution of the mass to node 2 and the excess is sent to collector 7 of excess water, from which further - p OTCToi iHHK 8 ll clarify turnover-214612

It is additionally equipped with a device for the treatment of pile-containing water, which is connected by pipeline to a device for removing tar and deep cleaning water.

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water The clarified water is subjected to demineralization in the unit. 9, and the condensed part, the skop, is directed to the preparation of paper pulp. From collector 10, the demineralized water enters the tar removal and deep cleaning device, which consists of two mixers and a sump. In the mixer 11 serves bentonite - natural mineral sorbent, pre-soaked in water. Bentonite absorbs polyzpychlorohydrin resins dissolved in water. Contact time 20 min. Next, the suspension is fed to mixer 12, where it is treated with flocculant polyacrylamide for 3-5 minutes. In the sump 13 is the separation of the phases within 30 minutes Processed in this way and purified from. Water resins are recycled to mass production, chemicals, cooling and sprinkling. The solid phase containing bentonite and substances included in the paper pulp composition is also returned to production. Moreover, the absence of bentonite in the mass is positively positive, since as a result of this, the foam formation at the ebb of the paper web is reduced.

From the press section 4, the pile-containing water enters the collector 15 and then to the clarifier 16, which is a serially connected mixer with a reagent (aluminum sulfate and polyacrylamide) and a sump for separating the solid phase. The pile pile is removed from the system, and the clarified water is fed to the resin removal and deep water purification unit and then returned to production.

Wastewater production of covering types of paper containing 2-4 mg / l of water-soluble polyepichloro312U6I2 4

hydrine resins (maximum tolerated - from 2000-10000 to 10-30 mg / l

my data content is resin (99.5%). I 0.005 mg / l), purified in the proposed

the system until the resin has a content of 0.005; the known system does not remove sm0.0075 mg / l (95%), the content of the weighted-j wastewater and

substances in press waters; press water without purification.

Claims (2)

1. A SYSTEM FOR CLEANING WASTE WATER discharged from the pool when the paper machine is operating, including a register water collector, excess water collector, a device for clarifying recycled water, a demineralization unit for clarified water, a collector for clarified demineralized water, characterized in that that, in order to increase the degree of wastewater treatment by reducing the content of the latest water-soluble polyepichlorohydrin resins and the disposal of spent reagents, the additional It is additionally equipped with a resin removal and deep water purification device installed after the demineralization unit and containing a water mixer with bentonite, a water mixer with a flocculant and a settler for separating the solid phase in series, the latter being connected by a pipe to the paper-making pool of the machine . > 2. The system · according to claim 1, characterized in that, in order to clean from mechanical impurities of waste iodine coming from the press part of the paper machine, the system is additionally equipped with a pile water purification device, which is connected by a pipe to a resin removal and deep cleaning device water.