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Treatment method of citrus canned production wastewater

A treatment method and technology for producing waste water, which is applied in food industry waste water treatment, flocculation/sedimentation water/sewage treatment, etc. It can solve the problems affecting the treatment effect, high viscosity of pectin waste water, and poor treatment effect, so as to improve process safety and stability, to achieve recycling and resource utilization, and to achieve good wastewater treatment effects

Inactive Publication Date: 2017-02-01
CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The air flotation method has high power consumption, high pectin moisture content, and poor separation effect
The precipitation method not only takes a long time to settle and the treatment effect is poor, but also because of the light density of pectin, it often floats on the water surface and crusts, which seriously affects the subsequent treatment effect
However, when the pectin wastewater is treated by the filter press method, the filter press effect is extremely unsatisfactory due to the high viscosity of the pectin wastewater.

Method used

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  • Treatment method of citrus canned production wastewater
  • Treatment method of citrus canned production wastewater
  • Treatment method of citrus canned production wastewater

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] A method for treating wastewater from canned citrus production, comprising the following steps: extracting acid soaking water and alkali soaking water produced in the production process of canned oranges, mixing the acid soaking water and alkali soaking water at a ratio of 1:2 to form comprehensive wastewater, and measuring its pH=3.5. First, the comprehensive wastewater is filtered with multi-layer (usually 3-5 layers) gauze, that is, the water sample is pretreated, and then the composite flocculant is added to the filtered comprehensive wastewater, in order to compare the effect of different composite flocculants on the comprehensive wastewater treatment. Influenced, four groups of experiments were carried out (since it was only a qualitative experiment to observe the flocculation effect, so the operation of centrifugation was not adopted), each of the filtered water samples was taken 30mL, and the following flocculants were added to the four groups of water samples: ...

Embodiment 2

[0047] A method for treating waste water from canned citrus production of the present invention, comprising the following steps: extracting acid soaking water and alkali soaking water generated during the production of canned oranges, mixing the acid soaking water and alkali soaking water at a ratio of 1:2 to form comprehensive wastewater , so that the pH of the comprehensive wastewater = 3.5. First filter the comprehensive wastewater with three layers of gauze, then add a composite flocculant to the filtered comprehensive wastewater, stir at 30rpm for 10min, and then perform solid-liquid separation by centrifugation, the centrifugal speed is 4000rpm, and the centrifugation time is 10min. Finish processing.

[0048] In this example, the composite flocculant is specifically CPAM (1g / L) and Fe 2 (SO 4 ) 3 (2g / L).

[0049] In this example, 150mL of each of the 4 groups of filtered water samples were taken and added respectively:

[0050] A. 6mL Fe 2 (SO 4 ) 3 +4mLCPAM

...

Embodiment 3

[0060] A method for treating waste water from canned citrus production of the present invention, comprising the following steps: extracting acid soaking water and alkali soaking water generated during the production of canned oranges, mixing the acid soaking water and alkali soaking water at a ratio of 1:2 to form comprehensive wastewater , so that the pH of the comprehensive wastewater = 3.5. First filter the comprehensive wastewater with three layers of gauze, then add a composite flocculant to the filtered comprehensive wastewater, stir at 30rpm for 10min, and then perform solid-liquid separation by centrifugation, the centrifugal speed is 4000rpm, and the centrifugation time is 10min. Finish processing.

[0061] In this example, experiments were carried out with different composite flocculants, 13 groups of filtered water samples of 30 mL each were taken, and reagents were added according to the requirements in Table 4. Each reagent and its concentration were: CaCl 2 (5g / ...

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Abstract

The invention discloses a treatment method of orange can production wastewater. The treatment method comprises the steps of guiding out acid dipping water and alkali dipping water generated in the orange can production process and mixing together into integrated wastewater, adding a composite flocculant to the integrated wastewater, stirring and then performing solid-liquid separation by centrifuging, thereby completing the treatment process; the composite flocculant is composed of an inorganic compound and an organic polymericflocculant; the inorganic compound is an inorganic flocculant and / or an auxiliary; the inorganic flocculant is Fe2(SO4)3, while the auxiliary is one or more of CaCl2, CaO and diatomite; the organic polymeric flocculant is one or more of cationic polyacrylamide, a dimethyl diallyl ammonium chloride-acrylamide copolymer, and cationic dicyandiamide-formaldehyde condensation polymer. The treatment method is good in treatment effect, stable in operation and low in cost.

Description

technical field [0001] The invention relates to a treatment method for canned wastewater, in particular to a treatment method for citrus canned production wastewater. Background technique [0002] After in-depth investigations in many places, due to the characteristics of their own production processes, citrus canned processing enterprises will discharge sewage of different water quality in each production process. Among them, the waste water with high pectin concentration mainly comes from acid immersion water, alkali treatment water, alkali The pectin concentration can reach 5000mg / L in the first rinsing water after soaking, the floor rinsing water in peeling workshops with high COD concentration, fruit scalding water, the second washing water after alkali soaking, and pot washing water. Due to the presence of pectin, the wastewater will be viscous and the chemical coagulation effect will be greatly reduced, which will bring great difficulties to the subsequent biochemical...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/52C02F1/56C02F103/32
CPCC02F1/52C02F1/56C02F2103/32
Inventor 余关龙陈宏杜春艳张波吴方同徐学杨娟娟
Owner CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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