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Purification method for recycling culture wastewater

A technology for aquaculture wastewater and seawater, applied in chemical instruments and methods, animal husbandry wastewater treatment, water pollutants, etc., can solve the problems of high operating cost, low treatment efficiency, impact, etc., and achieve the effect of simplified operation and convenient magnetic separation

Active Publication Date: 2020-01-03
ZHEJIANG OCEAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the research and application of mariculture wastewater treatment, the existing research at home and abroad has made preliminary progress, but many research results are difficult to be applied in actual projects
For example, membrane filtration technology is mainly used for the separation and concentration of some micron-sized particles. However, due to the high investment cost of this technology, membrane filtration technology is mostly used for wastewater treatment in circulating aquaculture systems, especially for aquaculture with high economic value. Treatment of wastewater produced by aquatic products; although ozone treatment technology and ultraviolet radiation disinfection technology can obtain better treatment effects, the operating cost is high and the treatment efficiency is low, which seriously affects the application of these two technologies

Method used

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  • Purification method for recycling culture wastewater
  • Purification method for recycling culture wastewater
  • Purification method for recycling culture wastewater

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Experimental program
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Effect test

Embodiment 1

[0038] The preparation method of the magnetic composite flocculant is as follows:

[0039] S1. Preparation of magnetic nanoparticles: 10g of ferric chloride hexahydrate and 20g of ferrous chloride tetrahydrate were heated up to the reaction temperature in a nitrogen atmosphere, and then 100mL of 20wt% ammonia water was added dropwise, and reacted at a constant temperature of 50°C for 2h under the protection of nitrogen. to room temperature, the synthesized magnetic nanoparticles were washed with deionized water several times, separated by a magnet, and magnetic nanoparticles were obtained for use;

[0040] S2. Preparation of magnetic composite flocculant: Add 2g of magnetic nanoparticles and 20mL of 20wt% ammonia water to deionized water, add 0.01g of silane coupling agent dropwise after heating up to the reaction temperature, react at constant temperature under nitrogen protection for 3 hours, add 7g of composite flocculation agent (terpolymer of polyacrylamide, methacrylic a...

Embodiment 2

[0042] The preparation method of the magnetic composite flocculant is as follows:

[0043] S1. Preparation of magnetic nanoparticles: 10g of ferric chloride hexahydrate and 30g of ferrous chloride tetrahydrate were heated up to the reaction temperature in a nitrogen atmosphere, and 300mL of 24wt% ammonia water was added dropwise, and reacted at a constant temperature of 60°C for 5h under the protection of nitrogen. to room temperature, the synthesized magnetic nanoparticles were washed with deionized water several times, separated by a magnet, and magnetic nanoparticles were obtained for use;

[0044]S2. Preparation of magnetic composite flocculant: Add 2g of magnetic nanoparticles and 40mL of 24wt% ammonia water into deionized water, add 0.03g of silane coupling agent dropwise after heating up to the reaction temperature, react at constant temperature under nitrogen protection for 6 hours, add 7g of composite flocculation agent (a copolymer of polyacrylamide and acrylic acid,...

Embodiment 3

[0046] The preparation method of the magnetic composite flocculant is as follows:

[0047] S1. Preparation of magnetic nanoparticles: 10g of ferric chloride hexahydrate and 25g of ferrous chloride tetrahydrate were heated to the reaction temperature in a nitrogen atmosphere, and 200mL of 22wt% ammonia water was added dropwise, and reacted at a constant temperature of 55°C for 3.5h under the protection of nitrogen. Cool down to room temperature, wash the synthesized magnetic nanoparticles with deionized water several times, and separate them with a magnet to obtain magnetic nanoparticles for use;

[0048] S2. Preparation of magnetic composite flocculant: Add 2g of magnetic nanoparticles and 30mL of 22wt% ammonia water into deionized water, add 0.02g of silane coupling agent dropwise after heating up to the reaction temperature, react at constant temperature under nitrogen protection for 4.5h, add 7g of composite Flocculant (composite of polyacrylamide and N,N-dimethylacrylamide...

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Abstract

The invention provides a purification method for recycling culture wastewater. Culture seawater is discharged into a water collecting well, is preliminarily purified, is discharged into an ionizationtank, is ionized to accelerate the decomposition of organic matters, and then is discharged into a filter tank, a magnetic composite flocculant is added to settle suspended pollutants in the wastewater, composite sponge iron is added to perform adsorption and chemical degradation, the obtained wastewater is filtered again through a pebble filter layer, and is discharged after being detected and reaching standards, and if the obtained water does not reach the standards, the obtained water is discharged into the water collecting well again, and undergoes above steps. Magnetic nanoparticles and an immobilized compound enzyme are connected through a silane coupling agent, so that the prepared composite flocculant is magnetic, can be easily magnetically separated, avoids complex steps such as filtration and centrifuging after a settling reaction, and simplifies the operation.

Description

technical field [0001] The invention relates to the technical field of waste water treatment, in particular to a purification method for recycling aquaculture waste water. Background technique [0002] Compared with domestic sewage and industrial wastewater, the main pollutants of mariculture wastewater are nutrients (nitrogen and phosphorus), and the concentration is relatively low. At the same time, there are a certain amount of suspended solids and dissolved organic matter, which affects the transparency of the water body. Reducing the nitrogen and phosphorus content in wastewater can fundamentally solve the eutrophication problem in the corresponding receiving sea area. Therefore, such aquaculture wastewater containing nutrients needs to be treated urgently. [0003] In the research and application of mariculture wastewater treatment, the existing research at home and abroad has made preliminary progress, but many research results are difficult to be applied in actual pr...

Claims

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Application Information

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IPC IPC(8): C02F9/12C02F9/14C02F1/54C02F1/52B01J20/20B01J20/30C02F101/16C02F101/20C02F101/30C02F103/20
CPCC02F9/00C02F1/54C02F1/5236B01J20/20B01J20/02C02F2101/30C02F2101/16C02F2101/166C02F2303/04C02F2209/08C02F2103/20C02F1/4691C02F1/5281C02F2001/007C02F1/001C02F1/488C02F2101/20C02F3/342C02F1/281C02F1/283
Inventor 杨金生
Owner ZHEJIANG OCEAN UNIV
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