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A method for reuse and treatment of casing processing wastewater

A technology for processing wastewater and casings, which is applied in the fields of water/sewage multi-stage treatment, water/sludge/sewage treatment, chemical instruments and methods, etc. Insufficient depth and other problems, to achieve the effect of feasible industrialization prospects, short wastewater treatment cycle, and outstanding flocculation effect

Inactive Publication Date: 2011-12-28
NANJING UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The existing technology has the following problems. First, the wastewater treatment only reaches the national third-level discharge standard, which cannot meet the national second-level discharge standard for the industry. Second, the depth of wastewater treatment is not enough, and a large amount of processing wastewater cannot be reused.

Method used

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  • A method for reuse and treatment of casing processing wastewater
  • A method for reuse and treatment of casing processing wastewater
  • A method for reuse and treatment of casing processing wastewater

Examples

Experimental program
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Effect test

Embodiment 1

[0058] Casing processing waste water (from a casing processing enterprise in Nantong), collect the waste water into the sump, adjust the pH value of the waste water to 7.5 with dilute sodium hydroxide solution; add chitosan according to the amount of 0.2g / L, and stir first (100r / min) for 5 minutes, and then left to flocculate for 30 minutes, and the supernatant was collected after the wastewater was separated into layers. Compared with raw water, the supernatant obtained by flocculation can achieve 81% removal rate of COD and 90% removal rate of protein.

[0059] Add activated carbon and diatomaceous earth in proportion to the supernatant, the amount of activated carbon added is 2g / L, and the ratio of activated carbon and diatomite is 1:2; after decolorization treatment for 30 minutes, collect the filtrate with a plate and frame filter; plate and frame filter The operating pressure of the machine is 1.8MPa.

[0060] The filtrate is subjected to ultrafiltration treatment with...

Embodiment 2

[0064] Casing processing waste water (from a casing processing enterprise in Nantong), collect the waste water into the sump, adjust the pH value of the waste water to 7.0 with dilute sodium hydroxide solution; add chitosan according to the addition amount of 0.3g / L, first stir (100r / min) for 5 minutes, then left to flocculate for 30 minutes, and the supernatant was collected after the waste water was stratified; compared with the raw water, the supernatant obtained by flocculation had a COD removal rate of 85%, and a protein removal rate of 94%.

[0065] Add activated carbon and diatomaceous earth in proportion to the supernatant, the amount of activated carbon added is 2g / L, and the ratio of activated carbon and diatomite is 1:1; after decolorization treatment for 30 minutes, collect the filtrate with a plate and frame filter; plate and frame filter The operating pressure of the machine is 2.0MPa.

[0066] The filtrate is subjected to ultrafiltration treatment with a cerami...

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Abstract

The invention discloses a method for reuse and treatment of casing processing wastewater, which comprises the following steps: adjusting the pH value of the casing processing wastewater to neutral or slightly alkaline; adding a flocculant to the wastewater for flocculation treatment, and taking the supernatant; The clear liquid is decolorized by adding activated carbon, and the filtrate is collected after plate and frame filtration; the filtrate is treated by ultrafiltration membrane ultrafiltration to collect the permeable liquid; the permeable liquid is treated by nanofiltration membrane nanofiltration, and the water quality of the permeable membrane reaches the level of reclaimed water Reuse requirements. The method of the present invention comprehensively treats casing processing wastewater through flocculation precipitation, activated carbon decolorization, ultrafiltration-nanofiltration treatment and other complete sets of processes, and makes the treated water quality meet the requirements of reclaimed water reuse, solving the problem of resource utilization of a large amount of casing processing wastewater problems, laying the foundation for energy saving and emission reduction in the casing processing industry.

Description

technical field [0001] The invention relates to a resource utilization method of casing processing waste water, in particular to a method for realizing the reuse of casing processing waste water through water treatment. Background technique [0002] Casing is China's traditional export bulk livestock product, and it has been ranked among the top five agricultural products for many years. At present, among the main casing producing countries such as China, the United States, Germany, Brazil, New Zealand, Australia and other countries, China has become the largest casing producing country in the world, and its output accounts for about 80% of the casing output in the world. accounted for more than 50% of world trade. [0003] Casing production uses a lot of water throughout the processing chain and generates large amounts of organic wastewater. The main component of dry matter in wastewater is chloride, and the organic matter is mainly crude protein, amino acid and fat, whic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04
Inventor 熊强许春龙张菲菲姚忠
Owner NANJING UNIV OF TECH
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