Method for treating papermaking wastewater based on combined process including integrated membrane technology and advanced oxidation technology

A process method and technical treatment technology, which is applied in the field of wastewater treatment to achieve the effects of high membrane flux, standard discharge, and reduction of total discharge

Inactive Publication Date: 2014-03-26
天津森诺过滤技术有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0014] The purpose of the present invention is to solve the technical problems in the existing papermaking wastewater treatment process, and provide a new method based on the combined process of membrane integration technology and Fenton advanced oxidation technology to treat papermaking wastewater and reuse it, so as to realize low-cost papermaking wastewater Efficient treatment and apply it in the production process

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  • Method for treating papermaking wastewater based on combined process including integrated membrane technology and advanced oxidation technology

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Effect test

Embodiment 1

[0043] A paper mill in the north uses cotton stalks and recycled waste paper as raw materials to produce various papers. The wastewater generated from papermaking is pretreated in the early stage and the primary sedimentation tank, and then enters the biochemical system, secondary sedimentation tank, submerged ultrafiltration system, and nanofiltration system. system. The nanofiltration concentrated wastewater is discharged up to standard after passing through the Fenton advanced oxidation treatment unit.

[0044] The SMF influent is the effluent from the secondary sedimentation tank of the original sewage treatment system. The SMF outlet water enters the SMF product water tank, and the concentrated water returns to the SMF water inlet tank. SMF is constant flow 3.6m 3 / h operation, the backwash operation of the SMF system can be realized by the outlet water through the backwash pump, and the forward flush operation of the system can be realized by the inlet water through th...

Embodiment 2

[0054] A paper mill in the south uses wood as raw material and mainly produces coated paper of various specifications and styles. After passing through the mixing tank, cooling tower and primary sedimentation, the papermaking wastewater enters the biochemical treatment system, secondary sedimentation tank, submerged ultrafiltration system, nano Filtration system, nanofiltration concentrated wastewater is discharged up to the standard after passing through the Fenton advanced oxidation treatment unit, and the produced water is reused in the process section for paper production.

[0055] The SMF outlet water is used as the inlet water of the NF system. It is pumped into the NF membrane module through the suction pump, security filter and booster pump. The NF concentrated water can be completely discharged into the Fenton advanced oxidation treatment unit through the control of the valve, and can also be partially returned to the The SMF water production tank achieves a large reco...

Embodiment 3

[0064] The submerged ultrafiltration membrane module used is a curtain-type hydrophilic polyvinylidene fluoride hollow fiber membrane module. The filtration accuracy of the membrane is 0.1 micron. There are a total of 8 membrane modules, and the area of ​​a single membrane module is 20m 2 , the processing capacity is 4.8T / h.

[0065] The nanofiltration membrane module is a 4-inch pollution-resistant roll-type nanofiltration membrane module, multi-stage treatment, a total of 6 membrane modules, the water production rate is 3.6T / h, and the recovery rate is over 75%.

[0066] Submerged ultrafiltration operation process: one operation cycle is 40 minutes, the backwash time is 30 seconds, the backwash water is ultrafiltration product water, the backwash water volume is 2.1 times the product water volume, and the online chemical cleaning is performed once a week.

[0067] Advanced oxidation process: collect the concentrated wastewater discharged from the nanofiltration membrane trea...

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Abstract

The invention discloses a method for treating papermaking wastewater based on a combined process including an integrated membrane technology and an advanced oxidation technology. The method comprises the steps of treating the papermaking wastewater through a previous period anoxic/aerobic biochemical process, then putting the wastewater into a submerged ultrafiltration unit and a nano-filtration treatment unit in sequence, and treating nano-filtration concentrated discharged water through a Fenton advanced oxidation technology to realize up-to-standard release. The method disclosed by the invention is a novel treatment technology of papermaking wastewater, the papermaking wastewater is formed by mixing pulping production wastewater, papermaking production wastewater and other wastewater on production as well as domestic sewage and abnormal rainwater, the CODcr (chemical oxygen demand) and pH value are adjusted, most of suspended objects and colloidal substances are removed through a rotary-drum filtration process and flocculating sedimentation, then the papermaking wastewater is subjected to anoxic/aerobic biochemical treatment and then enters the submerged ultrafiltration treatment unit, penetrating fluid enters a nano-filtration treatment system, the penetrating fluid subjected to nano-filtration can meet requirements for papermaking production water through detection, and the nano-filtration concentrated discharged water is treated in a Fenton advanced oxidation treatment unit to realize up-to-standard release. The method is particularly suitable for treating papermaking wastewater which is very difficult to recycle through a conventional sewage treatment method.

Description

【Technical field】 [0001] The invention relates to a wastewater treatment method, especially for the treatment and reuse of papermaking wastewater, which is different from the traditional papermaking wastewater treatment process. It has the advantages of low energy consumption, small footprint, and good treatment effect, and can be widely used in Treatment and reuse of various papermaking wastewater. 【technical background】 [0002] The paper industry is an important part of the national economy and one of the six major industrial pollution sources in the world. The discharge of papermaking wastewater in my country ranks second in industrial wastewater. Papermaking wastewater is high-concentration organic wastewater containing lignin, residual alkali, sulfide, chloride and other pollutants. It is characterized by a large amount of wastewater, high COD, a lot of fiber suspended matter in the wastewater, and contains divalent sulfur, which is colored and has a foul smell of mer...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C02F103/28
Inventor 陈玉海李然李大维张磊
Owner 天津森诺过滤技术有限公司
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