Culture method of short-cut nitrification and denitrification granular sludge

A technology of granular sludge and cultivation method, applied in the field of new biological denitrification

Inactive Publication Date: 2012-04-18
DALIAN UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the formation of granular sludge requires high hydraulic shear force (completed by aeration), too high aeration level will increase

Method used

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  • Culture method of short-cut nitrification and denitrification granular sludge
  • Culture method of short-cut nitrification and denitrification granular sludge

Examples

Experimental program
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Example Embodiment

[0012] Examples:

[0013] The ASBR reactor is composed of an inner tube and an outer tube, with an effective volume of 2.5L, an outer tube diameter of 7.0cm, a height of 80cm, an inner tube diameter of 4.4cm, and a height of 70cm.

[0014] Air enters the reactor by an air pump through a microporous aeration head installed in the center of the bottom of the reactor, and the resulting air flow pushes the liquid and granular sludge in the reactor upwards in the inner tube, and then moves down between the inner and outer tube walls. After reaching the bottom of the reactor, it is pulled upward by the air flow again, so that the mixed liquid can circulate between the inner and outer tube walls and mix evenly. Water is fed into the bottom of the reactor through a metering pump, and the drain is at a height of 40 cm at the bottom of the reactor, and the volume exchange rate is 50%. The water inlet, aeration, sedimentation and drainage time of the reactor are automatically controlled by a...

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Abstract

The invention which relates to a culture method of short-cut nitrification and denitrification granular sludge belongs to the technical field of water processing. The culture method is characterized in that: hydroxylamine with the concentration of 5-15mg/L is regularly added to gradually improve COD, ammonia nitrogen, and the phosphorous load in water to culture aerobic granular sludge. The effect of the culture method of the invention is the selective inhibition of hydroxylamine to NOB, so AOB and denitrifying bacteria are enriched. High waterpower shearing force (completed in an aeration mode) is needed to form the granular sludge, so an over-high aeration level allows DO in water to be improved, but low DO is needed by the short-cut nitrification, thereby above problem is solved through the intermit hydroxylamine addition. Hydroxylamine is an intermediate product of a nitration reaction, so the addition of a small amount of hydroxylamine generates no secondary pollution, thereby the culture method of the short-cut nitrification and denitrification granular sludge has a wide market application prospect.

Description

technical field [0001] The invention belongs to the field of novel biological denitrification of waste water, and relates to a method for adding hydroxylamine to an air-lift batch reactor (ASBR) to inhibit nitrification and cultivating short-range nitrification and denitrification granular sludge. Background technique [0002] With the increasingly stringent discharge standards, the removal of ammonia nitrogen in wastewater has attracted increasing attention. The traditional biological denitrification process includes two stages of nitrification and denitrification, in which the nitrification stage is divided into two steps of ammonia oxidation and nitrite oxidation, that is, NH 4 + -N→NO 2 - -N→NO 3 - -N; denitrification is divided into two steps of nitrate reduction and nitrite reduction, namely NO 3 - -N→NO 2 - -N→N 2 , and the short-range nitrification and denitrification process (singlereactorhighactivityammoniaremovalovernitrite, SHARON) is a new type of wast...

Claims

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Application Information

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IPC IPC(8): C02F3/30
Inventor 杨凤林徐光景徐晓晨
Owner DALIAN UNIV OF TECH
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