Recycling device used for papermaking advanced treatment wastewater and based on chemical decalcification

A technology of chemical decalcification and advanced treatment is applied in the field of recycling devices for advanced treatment of papermaking wastewater, which can solve the problems of recycling without advanced treatment, waste of water resources, waste water discharge, etc., so as to reduce the cost of membrane cleaning and regeneration, and reduce waste water discharge. , the effect of avoiding environmental pollution

Inactive Publication Date: 2013-08-21
BOYING XIAMEN SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0015] The purpose of the present invention is to provide a chemical-based wastewater treatment method for the problems of high cost, low efficiency, mostly discharged wastewater after treatment, no advanced treatment and recycling, and waste of water resources in the existing papermaking wastewater treatment methods. The combination of decalcification technology, electrochemical technology and membrane technology has lower cost and higher efficiency, making it a recycling device for papermaking advanced wastewater treatment

Method used

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  • Recycling device used for papermaking advanced treatment wastewater and based on chemical decalcification
  • Recycling device used for papermaking advanced treatment wastewater and based on chemical decalcification
  • Recycling device used for papermaking advanced treatment wastewater and based on chemical decalcification

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0063] 800 tons / day papermaking advanced treatment wastewater recycling method.

[0064] The water quality indicators of the papermaking advanced treatment wastewater were determined as shown in Table 1.

[0065] serial number project unit measured value serial number project unit measured value 1 COD Cr mg / L 150 4 Chroma 100 2 SS mg / L 120 5 Ca mg / L 400 3 Conductivity μS / cm 1600 6 hardness mmol / L 9.9

[0066] (1) Chemical decalcification

[0067] After the papermaking biochemical treatment, the effluent from the secondary sedimentation tank (that is, the papermaking advanced treatment wastewater) flows into the primary decalcification reaction tank 11 through the pipeline, and first adds an appropriate amount of lime saturated solution to adjust the pH value to 8.5 through the dosing device under stirring to remove false hardness. (bicarbonate), flow into the secondary decalcification reaction tank 13,...

Embodiment 2

[0082] 5000 tons / day papermaking advanced treatment wastewater recycling method.

[0083] The water quality indicators of the papermaking advanced treatment wastewater have been determined and are shown in Table 3.

[0084] serial number project unit measured value serial number project unit measured value 1 COD Cr mg / L 100 4 Chroma 150 2 SS mg / L 120 5 Ca mg / L 150 3 Conductivity μS / cm 1800 6 hardness mmol / L 4

[0085] (1) Chemical decalcification

[0086] After the papermaking biochemical treatment, the effluent from the secondary sedimentation tank (that is, the papermaking advanced treatment wastewater) flows into the primary decalcification reaction tank 11 through the pipeline, and firstly adds an appropriate amount of lime saturated solution to adjust the pH value to 9 under stirring through the dosing device to remove false hardness. (bicarbonate), flow into the secondary decalcification reaction...

Embodiment 3

[0101] 20,000 tons / day papermaking advanced treatment wastewater recycling method.

[0102] The water quality index of the papermaking advanced treatment wastewater was determined as shown in Table 5.

[0103] serial number project unit measured value serial number project unit measured value 1 COD Cr mg / L 150 4 Chroma 120 2 SS mg / L 80 5 Ca mg / L 200 3 Conductivity μS / cm 1200 6 hardness mmol / L 5

[0104] (1) Chemical decalcification

[0105] After the papermaking biochemical treatment, the effluent from the secondary sedimentation tank (that is, the papermaking advanced treatment wastewater) flows into the primary decalcification reaction tank 11 through the pipeline, and firstly adds an appropriate amount of lime saturated solution to adjust the pH value to 9.5 under stirring through the dosing device to remove false hardness. (bicarbonate), flow into the secondary decalcification reaction tank 13, add...

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Abstract

The invention discloses a recycling device used for papermaking advanced treatment wastewater and based on chemical decalcification. The recycling device comprises a chemical decalcification system, a filter system, an electrolysis system, a membrane separation system and a desalting system, wherein the chemical decalcification system is equipped with a dosing system, and the membrane separation system is one of an ultrafiltration system and an MBR (Membrane Bio-Reactor) system. The recycling device combines a chemical decalcification technology, an electrochemical technology and a membrane technology, and 70-85% of the papermaking advanced treatment wastewater can be regenerated and recycled after treated, so that wastewater discharge is reduced; environmental pollution due to the wastewater is avoided; waste of a water resource is reduced; the cost of the regenerated circulating water can be lower than that of tap water; and the recycling device is economical and reasonable, generates better economic benefits, lowers a water consumption index and a wastewater discharge index per ton of paper greatly, and raises economic and technical indexes of an enterprise.

Description

technical field [0001] The invention relates to a treatment device for papermaking advanced wastewater treatment, in particular to a recycling device for papermaking advanced wastewater treatment based on chemical decalcification technology, electrochemical technology and membrane technology. Background technique [0002] Pulping and papermaking wastewater refers to the cooking waste liquid (also known as black liquor, red liquor) produced by chemical pulping, the middle water produced in the pulp washing and bleaching process and the white water produced in the papermaking process. Generally, 1t of organic matter and 400kg of alkalis and sulfides are dissolved in black liquor for every 1t of sulphate pulp produced; about 900kg of organics and 200kg of oxides (calcium, magnesium, etc.) in the liquid. The discharge of waste liquid into rivers not only seriously pollutes water sources, but also causes a lot of waste of resources. The paper industry is a traditional large wat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C02F9/06
CPCY02A20/131
Inventor 张世文江中央陈艺许雅玲
Owner BOYING XIAMEN SCI & TECH
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