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Technology for treatment of mariculture circulating water of biological filter and membrane filtration

A technology of mariculture and combined treatment, applied in the field of water treatment technology of mariculture, can solve the periodic fluctuations in the removal effect of effluent particles and organic matter, the membrane filtration process does not have the ability to circulate and purify aquaculture water, and the filter has the ability to control and regulate pathogenic bacteria It can achieve the effect of high safety and stability, low operating cost and reducing the amount of membrane used.

Inactive Publication Date: 2012-07-25
QINGDAO SANGAO ZHIDA MARINE SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the biological filter has the following deficiencies in actual operation and application: (1) The packing of the biological filter has poor ability to remove particulate matter in the water body, especially ultrafine particles; (2) The treatment effect of the biological filter is unstable, and the content of effluent particles and organic matter or The corresponding removal effect has periodic fluctuations; (3) The biofilm in the filter constitutes the microbial source of the entire breeding system, so the filter has poor ability to control and regulate pathogenic bacteria
Therefore, the membrane module can intercept almost all particulate matter, microorganisms and solid nutrients in the mariculture water, but it has no ability to remove dissolved pollutants such as ammonia nitrogen and organic matter, that is, the membrane filtration process does not have the function of circulating and purifying the aquaculture water; while the other On the one hand, the membrane bioreactor process combined with membrane filtration process and activated sludge process has a similar effect on the removal of dissolved pollutants in aquaculture wastewater as a biological filter, but it is difficult to be widely used in production-scale recirculating aquaculture due to high cost

Method used

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  • Technology for treatment of mariculture circulating water of biological filter and membrane filtration
  • Technology for treatment of mariculture circulating water of biological filter and membrane filtration

Examples

Experimental program
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Effect test

Embodiment 1

[0030] The wastewater detection indicators in this example are: total ammonia nitrogen=0.25mg / L, COD=12mg / L, nitrite nitrogen=0.004mg / L, SS=250mg / L, microbial content=10 7 CFU / mL.

[0031] The biofilter and membrane filtration combined treatment process of marine aquaculture circulating water in this embodiment comprises the following steps:

[0032] (1) Pretreatment: pretreat the wastewater to be treated through grid filtration and foam separation;

[0033] (2) Preliminary filtration of the biological filter: the pretreated wastewater enters the biological filter, and the biological filter is filled with bamboo ring fillers accounting for 70% of the total volume. After 75 days of film formation, the bamboo ring fillers have mature biofilms on the surface. The hydraulic retention time of the bamboo ring filler is maintained at 0.5h. Under the conditions of temperature 22°C, DO>6.7mg / L, and pH value of 7.3, the wastewater is filtered through the filler and biofilm contact oxid...

Embodiment 2

[0042] The wastewater detection indicators in this example are: total ammonia nitrogen=2.20mg / L, COD=4mg / L, nitrite nitrogen=0.091mg / L, SS=15mg / L, microbial content=10 5 CFU / mL.

[0043] The biofilter and membrane filtration combined treatment process of marine aquaculture circulating water in this embodiment comprises the following steps:

[0044] (1) Pretreatment: pretreat the wastewater to be treated through grid filtration and foam separation;

[0045] (2) Preliminary filtration of biological filter: The pretreated wastewater enters the biological filter, and the biological filter is filled with bamboo ring fillers accounting for 70% of the total volume. After 60 days of film formation, the bamboo ring fillers have mature biofilms on the surface. The hydraulic retention time of the bamboo ring filler is maintained at 0.75h. Under the conditions of temperature 14°C, DO>6.7mg / L, and pH value of 8.0, the waste water is filtered through the filler and contacted with the biofi...

Embodiment 3

[0054] The wastewater detection indicators in this example are: total ammonia nitrogen=1.50mg / L, COD=8mg / L, nitrite nitrogen=0.050mg / L, SS=100mg / L, microbial content=10 6 CFU / mL.

[0055] The biofilter and membrane filtration combined treatment process of marine aquaculture circulating water in this embodiment comprises the following steps:

[0056] (1) Pretreatment: pretreat the wastewater to be treated through grid filtration and foam separation;

[0057] (2) Preliminary filtration of the biological filter: the pretreated wastewater enters the biological filter, and the biological filter is filled with bamboo ring fillers accounting for 70% of the total volume. After 70 days of film formation, the bamboo ring fillers have mature biofilms on the surface. The hydraulic retention time of the bamboo ring filler is maintained at 0.65h. Under the conditions of temperature 18°C, DO>6.7mg / L, and pH value of 7.8, the waste water is filtered through the filler and biofilm contact oxi...

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Abstract

The invention provides a technology for treatment of mariculture circulating water of biological filter and membrane filtration, which comprises the following steps of: (1) pretreating; (2) primarily filtering by a biological filter; (3) moderately filtering by a membrane filtering unit; and (4) precipitating in an impounding reservoir. Firstly, big-particle pollutants are intercepted by the biological filter, and other pollutants are subjected to oxidative degradation to remove main pollution impurities in a water body; and then, small-particle pollutants and microorganisms remained in the water body are intercepted by the membrane filtration so as to achieve the purpose of purifying the water body and circularly using. The technology disclosed by the invention keeps the advantages of the traditional biological filter on resolvable pollutants in the circulating culture water body. By regulating the seawater treatment process step, the efficient, safe and stable circulating culture water body treatment technology is formed by fully utilizing the characteristics of low effluent particles and microorganisms in the membrane filtration technology.

Description

technical field [0001] The invention relates to a seawater treatment process, in particular to the combined treatment of biological filter and membrane filtration to achieve the purpose of seawater purification and recycling, and belongs to the technical field of water treatment process for seawater aquaculture. Background technique [0002] The existing seawater recirculation aquaculture system includes multi-stage treatment units, the most critical of which is the biological treatment part based on the biological filter. This type of process is currently divided into two categories. The first category is traditional biological filters. The main purpose is to remove organic matter and ammonia nitrogen, and at the same time it can intercept some large particle pollutants. Biofilter, rotary drum biofilter. The other type is a biological filter whose main purpose is to remove particulate matter in circulating water bodies. The structure and control conditions of this type of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14
Inventor 刘鹰沈加正刘思涛李贤罗荣强
Owner QINGDAO SANGAO ZHIDA MARINE SCI & TECH
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