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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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  • Summary
  • 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 the DO in the water body, and short-range nitrification requires low DO, through intermittent dosing Hydroxylamine resolves this paradox

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
Comparison scheme
Effect test

Embodiment

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

[0014] The air enters the reactor through a microporous aeration head installed in the center of the bottom of the reactor by the air pump, and the formed airflow pushes the liquid and granular sludge in the reactor to move upward in the inner tube, and then move downward between the inner and outer tube walls, After arriving at the bottom of the reactor, it is pulled upward again by the air flow, so that the mixed liquid can circulate and mix evenly between the inner and outer tube walls. Water is fed into the bottom of the reactor through a metering pump, the outlet is at a height of 40 cm from the bottom of the reactor, and the volume exchange rate is 50%. The water intake, aeration, settlement and drainage time of the reactor are all automatically contr...

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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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