Denitrification purification method for marine culture wastewater

A technology of mariculture and denitrification, applied in the direction of anaerobic digestion treatment, etc., can solve the problems of high cost of denitrification, secondary pollution, complex operation of the system, etc.

Inactive Publication Date: 2009-05-27
DALIAN FISHERIES UNIVERSITY
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Problems solved by technology

However, because the aquaculture water is oxygen-enriched water (DO concentration is generally above 5.0 mg / L) and carbon source is lacking, the existing method is to deoxygenate the aquaculture water by nitrogen stripping or prolonging the hydraulic retention time, and at the same time add methanol, Glucose and other exogenous organic carbon sources, denitrification costs are high, system operation is complicated, and there are secondary pollution problems

Method used

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Embodiment Construction

[0014] a. Take the sludge at the bottom of the sedimentation tank in the seawater circulating water fish farming system, and make the hydrolyzed sludge through anaerobic cultivation and training. The specific steps are to take the black flocculent sludge at the bottom of the sedimentation tank in the seawater circulating water fish farming system, Repeatedly wash with tap water until the supernatant is clear, discard the supernatant, take the sludge and the total solids of mariculture wastewater (TS content is 882g / L) and mix them at a volume ratio of 1:4~6, and then use 0.1~0.2mol / L Adjust the pH value of the mixture to 5-6 with NaOH, put it into a stirrer, and cultivate it anaerobically at 20±2°C for 25-35 days;

[0015] b. Take the hydrolyzed sludge into the reactor and add the culture medium at a volume ratio of 1:3~5. The composition of the culture medium is: NaNO 3 500mg / L, methanol 1250mg / L, NaH 2 PO 4 1250mg / L and Na 2 HPO 4 10mg / L, use 0.4~0.6mol / L NaOH to adju...

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Abstract

The invention discloses a seaculture wastewater denitrification purifying method for purifying discharged wastewater of a seaculture system by utilization of home-grown sludge of the seaculture system, which is simple to operation, has low cost, and does not cause secondary pollution. The method comprises: taking sludge at the bottom of a settling tank in a seawater circulating water fish-farming system and preparing hydrolytic sludge through anaerobic cultivation and acclimation; mixing the hydrolytic sludge and a culture solution, and preparing denitrified active sludge through anaerobic cultivation and acclimation; mixing the hydrolytic sludge and seaculture wastewater according to the volume ratio of 1 to 8-10, and preparing an anaerobic solution of the seaculture wastewater, wherein the hydrolysis temperature is between 18 and 22 DEG C, the pH value is between 6 and 7, and the hydrolysis time is between 8 and 10 hours; and mixing the denitrified active sludge and the anaerobic solution of the seaculture wastewater according to the volume ratio of 1 to 3-5, and performing denitrification reaction under the conditions that the temperature is between 18 and 22 DEG C and the pH value is between 7 and 8.

Description

Technical field: [0001] The invention relates to a denitrification purification method for seawater aquaculture water, in particular to a seawater aquaculture method with simple operation, low cost, no secondary pollution, and self-produced sludge from the seawater aquaculture system to purify the wastewater discharged from the seawater aquaculture system Wastewater denitrification purification method. Background technique: [0002] In the seawater recirculating aquaculture system (composed of fish ponds, sedimentation tanks, air flotation devices and nitrification filters), ammonia nitrogen and organic matter are the main sources of water quality deterioration. At present, in production, the ammonia nitrogen and organic matter in the aquaculture water are oxidized and decomposed into nitrate with relatively low toxicity through biological nitrification technology, so that the water quality can be purified to a certain extent. However, because pure nitrification will cause ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/28
Inventor 李秀辰李俐俐张国琛牟晨晓母刚
Owner DALIAN FISHERIES UNIVERSITY
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