Regenerative cycle and utilization method for papermaking deep-treatment wastewater

A technology for advanced treatment and wastewater, applied in water/sewage treatment, chemical instruments and methods, multi-stage water/sewage treatment, etc. The effect of cleaning and regeneration cost, reducing waste water discharge and avoiding environmental pollution

Inactive Publication Date: 2013-07-24
BOYING XIAMEN SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0016] 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...

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

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Experimental program
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Effect test

Embodiment 1

[0043] 500 tons / day papermaking advanced treatment wastewater recycling method.

[0044] The water quality index of the papermaking advanced treatment wastewater was determined as shown in Table 1.

[0045] Table 1 Water quality index of advanced papermaking treatment wastewater

[0046] 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

[0047] (1) Chemical decalcification

[0048] 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 under stirring to adjust the pH value to 8.5, and then 600mg / L of Na is added. 2 CO 3 , and then add 10 mg / L FeSO 4 , then add Na 2 CO 3 Inversely adjust the pH value to 8, and finally add 2mg / L polyphen...

Embodiment 2

[0065] Recycling and recycling method of 6000 tons / day advanced papermaking wastewater treatment.

[0066] The water quality index of the described papermaking advanced treatment wastewater was determined as shown in Table 3.

[0067] Table 3 Water quality indicators of advanced papermaking wastewater treatment

[0068] 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

[0069] (1) Chemical decalcification

[0070] 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 under stirring to adjust the pH value to 9.5, and then 300mg / L of Na is added. 2 CO 3 , then add 5mg / L FeSO 4 , then add Na 2 CO 3 Inversely adjust the pH value to 9, and ...

Embodiment 3

[0087] 20,000 tons / day papermaking advanced treatment wastewater recycling method.

[0088] The water quality index of the described papermaking advanced treatment wastewater was determined as shown in Table 5.

[0089] Table 5 Water quality indicators of advanced papermaking wastewater treatment

[0090] 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

[0091] (1) Chemical decalcification

[0092]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 first added to adjust the pH to 9 through the dosing device under stirring, and then 500 mg / L of Na is added. 2 CO 3 , then add 8 mg / L FeSO 4 , then add Na 2 CO 3 Inversely adjust the pH val...

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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

[0001] technical field [0002] 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 [0003] 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 ...

Claims

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Application Information

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IPC IPC(8): C02F9/14C02F1/44C02F1/461
Inventor 张世文方俊辉杨幼军
Owner BOYING XIAMEN SCI & TECH
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