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A resource treatment method for food pickling wastewater

A treatment method and technology for pickling wastewater, applied in chemical instruments and methods, multi-stage water/sewage treatment, water/sludge/sewage treatment, etc., can solve wastewater discharge, poor environmental protection, high-concentration organic matter and salt waste Problems such as inability to handle liquid

Active Publication Date: 2015-09-30
BEIJING CYCLE COLUMBUS ENVIRONMENTAL SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Although Chinese patent CN200910096098.4 discloses a new type of membrane treatment and salt recovery method for mustard cleaning wastewater, it uses a specific nanofiltration membrane to clean mustard The wastewater is pretreated, neutralized by adding alkali, and then subjected to high-pressure filtration to recover brine. However, this method is mainly aimed at low-salt and low-COD cleaning wastewater. Recycling and utilization of salt and salt respectively, there is still waste water discharge, and the environmental protection is poor
As we all know, a large amount of organic matter will be produced in the process of food pickling. For the treatment of such high-COD and high-salt wastewater, it is difficult to survive in a high-salinity environment by simply applying biological methods and cannot be applied in the treatment of pickling wastewater.
If the advanced oxidation technology is adopted for the removal of organic matter in high-salt wastewater, on the one hand, the high concentration of organic matter makes the oxidation cost high;
[0008]Compared with traditional wastewater treatment methods, membrane technology treatment is not only effective, but also can realize the recycling of water and useful components, and the effective and comprehensive utilization of membrane technology can achieve drinking water quality However, due to the characteristics of the membrane itself and the complexity of the high concentration of organic matter in the wastewater, the simple use of membrane technology often leads to problems such as membrane pollution, reduced membrane efficiency, and high cost. Therefore, membrane technologies such as nanofiltration, ultrafiltration, and reverse Osmosis and electrodialysis technology are combined with other treatment technologies to further realize secondary or advanced treatment of sewage
At the same time, the pure membrane treatment process only concentrates organic matter, and the high-concentration organic matter and salt waste liquid produced cannot be treated and become hazardous waste liquid

Method used

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  • A resource treatment method for food pickling wastewater

Examples

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Effect test

Embodiment 1

[0049] Take mustard pickled waste water, COD is 5000mg / L, TDS is 3%, water inflow is 400m 3 / h, after ultrafiltration to remove suspended solids such as vegetable leaves and large particles, it flows into the nanofiltration device, and the nanofiltration produces high salt water 200m 3 / h flows into the reverse osmosis unit and produces 100 m of pure water 3 / h flows into the dilution device to produce high-concentration saline concentrated water 100 m 3 / h flows into electrodialysis for further concentration; 200m concentrated organic matter is produced 3 / h, COD is 10000mg / L, TDS is 3%, and the product water is further diluted 300 m by the dilution device 3 / h, enter the biochemical treatment and go through the anaerobic-anoxic-aerobic pool in turn, use microorganisms to effectively degrade organic matter, COD is reduced to 80mg / l, TDS is 1%, and after biodegradation, further ozone oxidation is carried out to remove organic matter deeply. The security filter filters the f...

Embodiment 2

[0051] Take mustard pickled waste water, COD is 6000mg / L, TDS is 4%, water inflow is 200m 3 / h, after ultrafiltration to remove suspended solids such as vegetable leaves and large particles, it flows into the nanofiltration device, and the nanofiltration produces high salt water 100m 3 / h flows into the reverse osmosis unit and produces 50 m of pure water 3 / h flows into the dilution device to produce high-concentration saline concentrated water 50m 3 / h flows into electrodialysis for further concentration; 100m concentrated organic matter is produced 3 / h, COD is 12000mg / L, and the product water is further diluted 150m by the dilution device 3 / h, enter the biochemical treatment and go through the anaerobic-anoxic-aerobic tank in turn, use microorganisms to effectively degrade organic matter, COD is reduced to 100mg / l, TDS is 3%, and after biodegradation, further ozone oxidation is carried out to remove organic matter deeply. The security filter filters the flow into the r...

Embodiment 3

[0053] Take mustard pickled waste water, COD is 7000mg / L, TDS is 5%, water inflow is 200m 3 / h, after ultrafiltration to remove suspended solids such as vegetable leaves and large particles, it flows into the nanofiltration device, and the nanofiltration produces high salt water 100m 3 / h flows into the reverse osmosis device, the produced water flows into the dilution device, and the high-concentration saline concentrated water flows into the electrodialysis for further concentration; the organic matter concentrated water is 100m 3 / h, COD is 14000mg / L, and the product water is further diluted 150m by the dilution device 3 / h, enter the biochemical treatment and go through the anaerobic-anoxic-aerobic pool in turn, use microorganisms to effectively degrade organic matter, COD is reduced to 110mg / l, TDS is 3.3%, and after biodegradation, further ozone oxidation is carried out to remove organic matter deeply. The security filter filters the flow into the reverse osmosis device...

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Abstract

The invention discloses a resourceful treatment method for food processing wastewater. The method includes the following steps: pretreatment is used to separate wastewater to obtain high salt water and high-density organic concentrated water; the high salt water is firstly subjected to reverse osmosis desalination to obtain pure water and high-density salty concentrated water; the organic concentrated water is diluted by the pure water obtained from reverse osmosis, is subjected to biochemical treatment and catalytic ozonation to remove organisms, and enters the reverse osmosis treatment after cartridge filtration. Based on the biological method, the invention utilizes the membrane technology to perform resourceful treatment on the food processing wastewater. The resourceful treatment method is widely applicable to the food processing industry; while effectively removing COD (chemical oxygen demand), the resourceful treatment method achieves the recycling of water and salt to the maximum extent, thereby achieving zero discharge of wastewater and environmental and economic benefits.

Description

Technical field: [0001] The invention relates to the field of advanced treatment of waste water in the food industry, in particular to a resource treatment method for food pickling waste water. Background technique [0002] According to the statistics of research data, the current research on the treatment methods of food pickling wastewater in my country is lagging behind, and the main focus is still on how to realize the purification of wastewater to meet the discharge requirements. few. [0003] For example: Chinese patent CN201310472143.8 discloses an integrated treatment method for waste water in a small pickling factory, which completes waste water purification by hydrolytic acidification-anaerobic-aerobic alternating reactor and internal reflux method; [0004] Chinese patent CN201310552875.8 discloses a purification treatment process for salty pickling wastewater in the food industry, which includes the following steps: (1) filtering and removing large particle solid...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/14
CPCY02A20/131
Inventor 李琴芝刘亚丽刘晨明李海波盛宇星
Owner BEIJING CYCLE COLUMBUS ENVIRONMENTAL SCI & TECH