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Regenerative cycle and utilization method for papermaking deep-treatment wastewater

A technology for advanced treatment and waste water, which is applied in the direction of water/sewage treatment, chemical instruments and methods, multi-stage water/sewage treatment, etc. It can solve the problems of recycling without advanced treatment, waste of water resources, waste water discharge, etc. Clean regeneration costs, reduce wastewater discharge, and avoid environmental pollution effects

Inactive Publication Date: 2014-11-05
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. Combining decalcification technology, electrochemical technology and membrane technology, the cost is lower and the efficiency is higher, so that it can achieve the recycling method of papermaking advanced wastewater treatment.

Method used

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  • Regenerative cycle and utilization method for papermaking deep-treatment wastewater

Examples

Experimental program
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Effect test

Embodiment 1

[0042] 500 tons / day papermaking advanced treatment wastewater recycling method.

[0043] The water quality indicators of the papermaking advanced treatment wastewater were determined as shown in Table 1.

[0044] Table 1 Water quality indicators of advanced papermaking wastewater treatment

[0045] serial number project unit measured value serial number project unit measured value 1 COD Cr mg / L 150 4 Chroma 60 2 SS mg / L 140 5 Ca mg / L 200 3 Conductivity μS / cm 1800 6 hardness mmol / L 4

[0046] (1) Chemical decalcification

[0047] The papermaking advanced treatment wastewater flows into the coagulation tank through the pipeline. In the coagulation tank, an appropriate amount of saturated lime solution is added to adjust the pH value to 8.5 under stirring through a dosing device, and then 600mg / L Na 2 CO 3 , and then add 10mg / L of FeSO 4 , then add Na 2 CO 3 Reversely adjust the pH value to 8, and fi...

Embodiment 2

[0064] 6000 tons / day papermaking advanced treatment wastewater recycling method.

[0065] The water quality indicators of the papermaking advanced treatment wastewater have been determined and are shown in Table 3.

[0066] Table 3 Water quality indicators of advanced papermaking wastewater treatment

[0067] serial number project unit measured value serial number project unit measured value 1 COD Cr mg / L 90 4 Chroma 150 2 SS mg / L 60 5 Ca mg / L 160 3 Conductivity μS / cm 1200 6 hardness mmol / L 2

[0068] (1) Chemical decalcification

[0069] The papermaking advanced treatment wastewater flows into the coagulation tank through the pipeline, and in the coagulation tank, an appropriate amount of saturated lime solution is added to adjust the pH value to 9.5 under stirring through a dosing device, and then 300mg / L Na 2 CO 3 , and then add 5mg / L of FeSO 4 , then add Na 2 CO 3 Reversely adjust the pH value...

Embodiment 3

[0086] 20,000 tons / day papermaking advanced treatment wastewater recycling method.

[0087] The water quality index of the papermaking advanced treatment wastewater was determined as shown in Table 5.

[0088] Table 5 Water quality indicators of advanced papermaking wastewater treatment

[0089] serial number project unit measured value serial number project unit measured value 1 COD Cr mg / L 120 4 Chroma 80 2 SS mg / L 120 5 Ca mg / L 200 3 Conductivity μS / cm 1500 6 hardness mmol / L 1.2

[0090] (1) Chemical decalcification

[0091] The papermaking advanced treatment wastewater flows into the coagulation tank through the pipeline, and in the coagulation tank, an appropriate amount of saturated lime solution is added to adjust the pH value to 9 through the dosing device under stirring, and then 500mg / L Na 2 CO 3 , and then add 8mg / L of FeSO 4 , then add Na 2 CO 3Reversely adjust the pH value to 8.5, and...

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Abstract

The invention discloses a regenerative cycle and utilization method for papermaking deep-treatment wastewater. The regenerative cycle and utilization method comprises the steps of chemical decalcification, filtration, electrolysis, biological aerated filter biochemical treatment, ultrafiltration and reverse osmosis. A chemical decalcification system can be used for effectively removing high-concentration calcium ions and magnesium ions in the papermaking deep-treatment wastewater, and the removal rate achieves 50%; the COD (chemical oxygen demand) is further reduced via nano-catalytic electrolysis; 70-85% of the papermaking deep-treatment wastewater can be regeneratively cycled and utilized via the treatment of the method disclosed by the invention, thus greatly reducing the water consumption index and the wastewater discharge index of per ton of paper, increasing the economic and technical indexes of enterprises, reducing the discharge of the wastewater, avoiding the pollution of the wastewater to environment, and reducing the waste of water resources; and the cost of the regenerated cycling water can be lower than the price of running water, so that the regenerative cycle and utilization method is economical, reasonable, and capable of generating good economic benefits.

Description

technical field [0001] The invention relates to a treatment method for papermaking advanced treatment wastewater, in particular to a recycling method for papermaking advanced treatment wastewater 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 Patents(China)
IPC IPC(8): C02F9/14C02F1/44C02F1/461
Inventor 张世文杨幼军
Owner BOYING XIAMEN SCI & TECH
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