阅读说明：本技术 一种造纸废水回收再循环系统及其回收循环方法 (Papermaking wastewater recycling system and recycling method thereof ) 是由 陈浩 张院生 于 2020-06-30 设计创作，主要内容包括：本发明的一种造纸废水回收再循环系统及其回收循环方法,属于造纸污水回收技术领域,纸机的出水口与白水池的入水口管道连通,白水池设有三个出水口,分别为与纸机入水口连通的一级出水口；与多圆盘过滤机入水口连通的二级出水口以及与清洁水池连通的三级出水口,多圆盘过滤机将来自白水池的二级出水口的水进行过滤回收得到超清白水、清白水、浊白水和回收浆,超清白水回注至纸机,清白水注入清洁水池,浊白水在多圆盘过滤机内回流,回收浆进入混合浆池,此设计的结构,将纸机消耗出来的水进行沉淀并进行循环利用,由于纸机在造纸过程中需要消耗大量的水,因此白水池回收后的水进行二次回注给纸机可以节约大量清水,避免了过多的水污染和水消耗。(The invention relates to a recycling system and a recycling method for papermaking wastewater, belonging to the technical field of papermaking wastewater recycling.A water outlet of a paper machine is communicated with a water inlet pipeline of a white water tank, and the white water tank is provided with three water outlets which are respectively a primary water outlet communicated with a water inlet of the paper machine; the multi-disc filter filters and recovers water from the second-level water outlet of the white water tank to obtain ultra-clear water, clear white water, turbid white water and recovered pulp, the ultra-clear water is reinjected to the paper machine, the clear water is injected into the clean water tank, the turbid white water flows back in the multi-disc filter, the recovered pulp enters the mixed pulp tank, and the water consumed by the paper machine is precipitated and recycled.)

1. A papermaking waste water recycling system is characterized in that: the multi-disc pulp mixing machine comprises a white water tank (100), a multi-disc filter (200), a mixed pulp tank (300) and a paper machine (400), wherein a water outlet of the paper machine (400) is communicated with a water inlet pipeline of the white water tank (100), and the white water tank (100) is provided with three water outlets which are respectively a primary water outlet (110) communicated with a water inlet of the paper machine (400); the multi-disc filter comprises a secondary water outlet (120) communicated with a water inlet of the multi-disc filter (200) and a tertiary water outlet (130) communicated with a clean water tank (500), the multi-disc filter (200) filters and recovers water from the secondary water outlet (120) of the white water tank (100) to obtain ultra-clean white water, turbid white water and recovered pulp, the ultra-clean white water is injected back to the paper machine (400), the clean white water is injected into the clean water tank (500), the turbid white water flows back in the multi-disc filter (200), and the recovered pulp enters the mixed pulp tank (300).

2. The recycling system of paper-making waste water according to claim 1, characterized in that: and after being stirred and mixed, the recovered pulp in the mixed pulp tank (300) is conveyed to a multi-disc filter (200) for continuous filtration.

3. The recycling system of paper-making waste water according to claim 1, characterized in that: the white water tank (100) comprises a first-order tank (140) and a second-order tank (150), the first-order tank (140) and the second-order tank (150) are of a stepped structure, the second-order tank (150) is communicated with a paper machine (400) through a pipeline, the first-order tank (140) is communicated with a multi-disc filter (200) through a pipeline, and a filtering mechanism (160) is arranged between the first-order tank (140) and the second-order tank (150).

4. The recycling system of paper-making waste water according to claim 3, characterized in that: the water quality detection device is characterized in that a water quality detector (170) is arranged in the first-order pool (140), the water quality detector (170) is externally connected with a controller (180), electromagnetic valves (190) are arranged on a pipeline between the first-order pool (140) and the multi-disc filter (200) and a pipeline between the second-order pool (150) and the paper machine (400), and the electromagnetic valves (190) are electrically connected with the controller (180).

5. The recycling system of paper-making waste water according to claim 3, characterized in that: the filter mechanism (160) comprises an arc-shaped filter base (161) and a filter screen wheel (162), wherein the filter screen wheel (162) comprises a plurality of filter blades (163), and the maximum interval length between the plurality of filter blades (163) is smaller than the arc length of the arc-shaped filter base (161).

6. A recycling method of a recycling system of papermaking wastewater is characterized in that: the recovery circulation method comprises the following steps:

s100, injecting water, namely connecting a clear water pipeline with a paper machine (400) to perform primary water injection operation, and starting paper production and sewage discharge of the paper machine (400);

s200, precipitating, namely injecting sewage discharged by the paper machine (400) into a white water pool (100) for precipitation to perform a first recovery operation to obtain recovered white water;

s300, filtering, namely injecting the recovered white water into a multi-disc filter (200) to carry out filtering operation to obtain super-clear white water, turbid white water and recovered pulp;

and S400, circulating, and reinjecting the ultra-clear water to the paper machine (400) for recycling.

7. The recycling method of a recycling system of paper making wastewater according to claim 6, characterized in that: in the step S200, water quality detection is required for the recovered white water during precipitation, and if the clarity of the recovered white water after precipitation can reach 10-30 mg/L, the recovered white water is injected back into the paper machine (400) for recycling; if the clarity of the recovered white water after precipitation can reach 30-100 mg/L, injecting the recovered white water into a multi-disc filter (200) for filtering; if the clarity of the recovered white water after precipitation is higher than 100mg/L, the recovered white water is injected into a cleaning water tank (500).

8. The recycling method of a recycling system of paper making wastewater according to claim 6, characterized in that: in the filtering in the step S300, the recovered pulp enters the mixed pulp tank (300) to be mixed with the recovered white water injected from the white water tank (100), and then the recovered white water is filtered and recovered by the multi-disc filter (200).

Technical Field

The invention belongs to the technical field of papermaking wastewater recovery, and particularly relates to a papermaking wastewater recovery and recirculation system and a recovery and recirculation method thereof.

Background

The paper industry is an important post industry closely related to national economic development and social civilization construction, but the extensive development mode causes certain pollution to the environment. The discharge amount of the waste water of the paper industry is large, the untreated waste water contains a large amount of pollutants, the oxygen consumption is large, the color is deep, the taste is smelly, and certain toxicity is realized. The pollutants have certain influence on the quality of the received water body, even destroy the ecological environment, and have large discharge amount of papermaking wastewater, complex components and large treatment difficulty.

Therefore, the recycling of the recycled wastewater is particularly important, and not only can tap water be reduced, but also the fibers dissolved in the water can be extracted for recycling.

Disclosure of Invention

1. Technical problem to be solved by the invention

The present invention aims to solve the above problems.

2. Technical scheme

In order to achieve the purpose, the technical scheme provided by the invention is as follows:

the invention relates to a recycling system for papermaking wastewater, which comprises a white water tank, a multi-disc filter, a mixed pulp tank and a paper machine, wherein the water outlet of the paper machine is communicated with a water inlet pipeline of the white water tank; the multi-disc filter filters and recovers water from the second-stage water outlet of the white water tank to obtain ultra-clear white water, turbid white water and recovered pulp, the ultra-clear white water is reinjected to the paper machine, the clear white water is injected into the clean water tank, the turbid white water flows back in the multi-disc filter, and the recovered pulp enters the mixed pulp tank.

Preferably, the recovered slurry in the mixing slurry tank is stirred and mixed, and then is conveyed to a multi-disc filter for further filtration.

Preferably, the white water tank comprises a first-order tank and a second-order tank, the first-order tank and the second-order tank are of a stepped structure, the second-order tank is communicated with a paper machine pipeline, the first-order tank is communicated with a multi-disc filter pipeline, and a filtering mechanism is arranged between the first-order tank and the second-order tank.

Preferably, a water quality detector is arranged in the first-order tank, the water quality detector is externally connected with a controller, electromagnetic valves are arranged on a pipeline between the first-order tank and the multi-disc filter and a pipeline between the second-order tank and the paper machine, and the electromagnetic valves are electrically connected with the controller.

Preferably, the filtering mechanism comprises an arc-shaped filtering base and a filtering net wheel, the filtering net wheel comprises a plurality of filtering blades, and the maximum interval length among the plurality of filtering blades is smaller than the arc length of the arc-shaped filtering base.

A recycling method of a recycling system of papermaking wastewater comprises the following steps:

s100, injecting water, namely connecting a clear water pipeline with a paper machine to perform primary water injection operation, and enabling the paper machine to start to produce paper and discharge sewage;

s200, precipitating, namely injecting sewage discharged by the paper machine into a white water tank for precipitation to perform a first recovery operation to obtain recovered white water;

s300, filtering, namely injecting the recovered white water into a multi-disc filter for filtering operation to obtain super-clear white water, turbid white water and recovered pulp;

and S400, circulating, and reinjecting the ultra-clear water to a paper machine for recycling.

Preferably, in the step S200 of precipitating, the recovered white water needs to be subjected to water quality detection, and if the clarity of the recovered white water after precipitating can reach 10-30 mg/L, the recovered white water is injected back into the paper machine for recycling; if the clarity of the recovered white water after precipitation can reach 30-100 mg/L, injecting the recovered white water into a multi-disc filter for filtering; and if the clarity of the recovered white water after precipitation is higher than 100mg/L, injecting the recovered white water into the cleaning water tank.

Preferably, in the filtering process of step S300, the recovered pulp enters the mixed pulp tank to be mixed with the recovered white water from the white water tank, and then the mixture is filtered and recovered by the multi-disc filter.

3. Advantageous effects

Compared with the prior art, the technical scheme provided by the invention has the following beneficial effects:

(1) the invention relates to a recycling system for papermaking wastewater, which comprises a white water tank, a multi-disc filter, a mixed pulp tank and a paper machine, wherein the water outlet of the paper machine is communicated with a water inlet pipeline of the white water tank; the multi-disc filter filters and recovers water from the second-level water outlet of the white water tank to obtain ultra-clear water, clear white water, turbid white water and recovered pulp, the ultra-clear water is reinjected to the paper machine, the clear water is injected into the clean water tank, the turbid white water flows back in the multi-disc filter, the recovered pulp enters the mixed pulp tank, and the water consumed by the paper machine is precipitated and recycled.

(2) The invention relates to a recycling system for papermaking wastewater, wherein a white water tank comprises a first-order tank and a second-order tank, the first-order tank and the second-order tank are of a stepped structure, the second-order tank is communicated with a paper machine pipeline, the first-order tank is communicated with a multi-disc filter pipeline, and a filtering mechanism is arranged between the first-order tank and the second-order tank.

(3) According to the recycling system and the recycling method for the papermaking wastewater, the method is adopted to recycle the sewage discharged by the paper machine, so that the amount of tap water directly used by the paper machine is greatly reduced, and simultaneously, a lot of sewage is reduced.

Drawings

FIG. 1 is a schematic view showing the construction of a recycling system for paper-making waste water according to the present invention;

FIG. 2 is a schematic view showing another construction of a recycling system for paper-making waste water according to the present invention;

fig. 3 is a side view of a white water tank of a paper-making waste water recycling system of the present invention;

FIG. 4 is a flow chart of a recycling method of a recycling system of paper-making waste water according to the present invention.

The reference numerals in the schematic drawings illustrate:

100. a white water tank; 110. a primary water outlet; 120. a secondary water outlet; 130. a third-stage water outlet; 140. a first-order pool; 150. a second-order pool; 160. a filtering mechanism; 161. a filter base; 162. a filter screen wheel; 163. a filter blade; 170. a water quality detector; 180. a controller; 190. an electromagnetic valve;

200. a multi-disc filter;

300. a mixed slurry tank;

400. a paper machine;

500. and cleaning the water tank.

Detailed Description

In order to facilitate an understanding of the invention, the invention will now be described more fully hereinafter with reference to the accompanying drawings, in which several embodiments of the invention are shown, but which may be embodied in many different forms and are not limited to the embodiments described herein, but rather are provided for the purpose of providing a more thorough disclosure of the invention.

It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present; when an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present; the terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs; the terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention; as used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.