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Culture method of aerobic nitrosated granular sludge

A technology of nitrosating granules and a culturing method is applied in the field of culturing aerobic nitrosating granular sludge, which can solve the problems of low volume load and low removal rate of the reactor, and achieve the effects of improving operation stability and improving removal efficiency.

Inactive Publication Date: 2005-11-23
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to solve the problems of low reactor volume load and low removal rate due to low sludge concentration in the existing nitrosation reactor, the invention provides a method for cultivating aerobic nitrosation granular sludge, the steps are as follows:

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] The anaerobic granular sludge in a UASB reactor used to treat brewery wastewater and the aerobic activated sludge in a nitrification reactor in the laboratory were mixed uniformly at a ratio of 10:1. Then inoculate the mixed mud into the upflow aerobic reactor, the total volume of the reactor is 3.05L, wherein the volume of the reaction zone is 1.60L, the precipitation zone is 1.04L, and the precipitation zone is equipped with a three-phase separator. After inoculation, the reactor The sludge concentration is 2.34gSS / L. The ammonia nitrogen concentration in the simulated wastewater is 200-600mg / L, and KH is added to the wastewater 2 PO 4 and trace elements, the concentrations are 0.05g P / L, 0.001g Zn / L, 0.0005g Co / L, 0.002g Mn / L, 0.0008g Cu / L, 0.0012g Mo / L, 0.003g Ca / L and 0.002 g Fe / L, the simulated wastewater does not contain organic carbon sources. The operating conditions of the reactor are: temperature 30-35°C, pH value 6.4-7.7, hydraulic retention time 8-12 hou...

Embodiment 2

[0019] Using the same inoculated sludge as in Example 1, the pH value is 7.5 to 8.5, the hydraulic retention time is 5 to 8 hours, the air velocity is 30 to 50 L / h, and the dissolved oxygen is controlled at 6 to 7 mg / L. 1, the nitrosated granular sludge appeared in the reactor after continuous culture for about 75 days.

Embodiment 3

[0021] Using the same inoculation sludge as in Example 1, changing the concentration of Ca and Fe in the trace elements, 0.005g Ca / L and 0.001gFe / L, the rest of the operating process is the same as in Example 1, after continuous cultivation for about 124 days, the reactor Nitrosification granular sludge appears.

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Abstract

Disclosed is a culture method of aerobic nitrosated granular sludge comprising the steps of, loading active sludge into upstream type aerobic reactor equipped with three-phase separator, letting in simulated waste water with an amino-nitrogen concentration of 200-800mg / L and right amount of added phosphate and trace element, flowing the waste water through sludge and exiting from the upper portion of the reactor, employing air aeration with air speed of 20-50L / h, controlling reactor temperature, pH, dissolved oxygen and conditions including waterpower retention period.

Description

technical field [0001] The invention relates to a method for cultivating aerobic nitrosation granular sludge, belonging to the technical field of wastewater biological treatment. Background technique [0002] With the intensification of nitrogen pollution and the enhancement of people's awareness of environmental protection, wastewater biological denitrification technology has attracted widespread attention from all over the world and has become an important research direction for water pollution control. Nitrite-based biological denitrification technology has attracted widespread attention due to its advantages of reducing energy consumption, saving carbon sources, and reducing sludge generation. The core of the nitrous acid type biological denitrification technology is to control the nitrification process in the nitrous acid stage. Usually, the inherent difference in the kinetic characteristics of nitrous acid bacteria and nitric acid bacteria is used to control temperatur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/12
CPCY02W10/10
Inventor 左剑恶杨洋卜德华顾夏声
Owner TSINGHUA UNIV