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Resourceful treatment system and treatment method for sodium carboxymethyl cellulose production wastewater

A technology for sodium carboxymethyl cellulose and waste water production, which is applied in water/sewage treatment, chemical instruments and methods, heating water/sewage treatment, etc. Realize problems such as salt and water resources, and achieve the effects of low cost, simple operation and resource utilization

Inactive Publication Date: 2019-11-29
JIANGSU LASON CHEM ENVIRONMENTAL PROTECTION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The production wastewater of CMC products is characterized by high salt and high COD, which can reach up to 20-50g / L. Every ton of CMC produced will produce 2-3 tons of wastewater. Among them, high salt and some organic matter can inhibit microorganisms and lead to biochemical Poor degradation performance, great harm to the environment
At present, the commonly used methods are: first evaporation and desalination followed by biochemical; micro-electrolysis + anaerobic + aerobic method; resin exchange method; hydrogen peroxide oxidation method, etc., but these methods have not been able to achieve good salt and water resources. change

Method used

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  • Resourceful treatment system and treatment method for sodium carboxymethyl cellulose production wastewater

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Embodiment 1

[0048] Select a carboxymethyl cellulose production wastewater in Shandong, COD is 40 g / L, TDS is 98 g / L, of which sodium chloride accounts for 85 g / L. The specific operation is as follows:

[0049] (1) Biochemical water distribution: After coagulation and sedimentation of high-salt and high-organic waste water, it is pumped into the distribution tank, and the COD of the wastewater is adjusted to 8g / L, and the TDS is 18g / L. mechanical evaporation of condensed water;

[0050] (2) First-class aerobic for salt-tolerant bacteria + anaerobic for salt-tolerant bacteria + second-level aerobic for salt-tolerant bacteria + aerated biological filter for salt-tolerant bacteria: biochemical water distribution enters first-level aerobic for salt-tolerant bacteria + anaerobic for salt-tolerant bacteria Oxygen + salt-tolerant bacteria secondary aerobic + salt-tolerant bacteria aerated biological filter, in which the residence time of the first-level aerobic and salt-tolerant bacteria anaerob...

Embodiment 2

[0058] Select a carboxymethyl cellulose production wastewater in Jiangsu, COD is 37g / L, TDS is 75g / L, of which sodium chloride accounts for 70g / L. Concrete implementation steps are roughly the same as embodiment 1, the difference is:

[0059] (1) COD of biochemical distribution water is 7.5g / L, TDS is 1.6g / L;

[0060] (2) The pH of the feed water for catalytic reduction and catalytic oxidation is adjusted to 2;

[0061] (3) The dosage of hydrogen peroxide in the process of ozone catalytic oxidation is 0.2‰, and the residence time is 30min.

[0062] Under the above operating conditions, when the biochemical influent water is 7.5g / L, the effluent COD of ozone catalytic oxidation after the above steps Cr Within 100mg / L, after RO treatment, the water quality index of RO effluent is: COD Cr Less than 15mg / L, Cl - Less than 30mg / L, conductivity less than 50μs / cm, the water quality is due to tap water, which can be used for industrial reuse; the purity of sodium chloride is great...

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Abstract

Belonging to the field of water treatment, the invention discloses a resourceful treatment system and treatment method for sodium carboxymethyl cellulose production wastewater. The system sequentiallycomprises a halotolerant bacteria biochemical system, a catalytic reduction catalytic oxidation unit, a catalytic ozonation unit, an RO unit, an MVR mechanical evaporation unit and a crude salt refining unit. The halotolerant bacteria biochemical system comprises a halotolerant bacteria primary aerobic device, a halotolerant bacteria anaerobic device, a halotolerant bacteria secondary aerobic device and a halotolerant bacteria biological aerated filter in order. The system and method provided by the invention combine the halotolerant bacteria biochemical system, catalytic reduction catalyticoxidation, membrane concentration and MVR evaporation technologies, the operation is simple, high efficiency composite halotolerant bacteria are employed for biochemical treatment of wastewater, large-multiple dilution of wastewater is not needed, the treatment water amount and the operation cost are reduced, and reclamation of salt and water is achieved.

Description

technical field [0001] The invention relates to the field of water treatment, in particular to a resource treatment system and treatment method for waste water produced by sodium carboxymethyl cellulose. Background technique [0002] Sodium carboxymethyl cellulose (CMC) is currently the world's largest production and application of cellulose products, commonly known as "industrial monosodium glutamate", is a very important industrial additive, widely used in food, daily chemical industry, building materials industry , petroleum industry, medical industry, etc. [0003] The production wastewater of CMC products is characterized by high salt and high COD, which can reach up to 20-50g / L. Every ton of CMC produced will produce 2-3 tons of wastewater. Among them, high salt and some organic matter can inhibit microorganisms and cause biochemical Poor degradation performance, great harm to the environment. At present, the commonly used methods are: first evaporation and desalinat...

Claims

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Application Information

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IPC IPC(8): C02F9/14C02F101/30
CPCC02F1/04C02F1/441C02F1/5236C02F1/56C02F1/66C02F1/725C02F1/78C02F3/30C02F9/00C02F2101/30
Inventor 夏苏敏刘汉飞王帅李琳蒋伟群
Owner JIANGSU LASON CHEM ENVIRONMENTAL PROTECTION
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