Method for restoring sticky expansion of aerobic granular sludge

An aerobic granular sludge and viscous technology, used in chemical instruments and methods, water/sludge/sewage treatment, granular microbial carrier treatment, etc., can solve problems such as swelling and instability, and achieve smooth surface and regular shape. , the effect of good sedimentation performance

Inactive Publication Date: 2017-07-07
ZHEJIANG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a method for repairing the viscous expansion of aerobic granular sludge for the aerobic granular sludge process that has undergone viscous exp

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  • Method for restoring sticky expansion of aerobic granular sludge
  • Method for restoring sticky expansion of aerobic granular sludge
  • Method for restoring sticky expansion of aerobic granular sludge

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Embodiment 1

[0018] (1) Granular sludge with viscous expansion: the reactor influent COD is 1000 mg / L, and the organic load is 3.0 kg COD / m 3 d, COD:N:P=100:7:1, pH=7.2, CaCl 2 100 mg / L, MgSO 4 30 mg / L, FeSO 4 3 mg / L, the concentration of trace elements added are: H 3 BO 3 0.05mg / L, CuSO 4 ·5H 2 O 0.05mg / L, ZnSO 4 ·7H 2 O 0.05mg / L, AlCl 3 ·6H 2 O 0.09 mg / L, CoCl 2 6H 2 O 0.05mg / L, MnSO 4 ·H 2 O 0.05mg / L, (NH 4 ) 2 Mo 7 o 24 0.05 mg / L, NiCl 2 ·6H 2 O 0.09 mg / L. When the viscous swelling problem occurred, the average particle size of the granular sludge was 1.2 mm, the SVI was 82 mL / g, and the sludge concentration was 4.33 g SS / L. The surface of the granular sludge was rough and the structure was loose under the microscope, such as figure 2 (a) shown.

[0019] (2) Bioreactor: The reactor is made of plexiglass, with a height of 70cm, an inner diameter of 10cm, and an effective volume of 4L. It adopts the sequence batch operation mode, and the water inlet, stirring, a...

Embodiment 2

[0023] (1) Granular sludge with viscous expansion: SBR reactor influent COD is about 500mg / L, ammonia nitrogen is 30-50 mg / L, and KH is added 2 PO 4 and K 2 HPO 4 ·3H 2 O is 34 mg / L and 45 mg / L respectively, the control system pH=7.3, CaCl 2 , MgSO 4 , FeSO 4Concentrations were 80 mg / L, 20 mg / L, 6 mg / L, and the dosage of other trace elements were: H 3 BO 3 0.1 mg / L, CuSO 4 ·5H 2 O 0.1 mg / L, ZnSO 4 ·7H 2 O 0.1 mg / L, AlCl 3 6H 2 O 0.18 mg / L, CoCl 2 6H 2 O 0.1 mg / L, MnSO 4 ·H 2 O 0.1 mg / L, (NH 4 ) 2 Mo 7 o 24 0.1 mg / L, NiCl 2 ·6H 2 O 0.18 mg / L. The problem of viscous swelling occurred during the operation. The average particle size of the granular sludge was 0.9 mm, the SVI increased to 90 mL / g, and the sludge concentration decreased to 3.6 g SS / L (of which 1.8 g SS / L was the control group). The turbidity increases, presenting cloudy milky white. Granular sludge under the microscope Figure 4 (a) shown.

[0024] (2) Granular sludge reactor: The react...

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Abstract

The invention discloses a method for restoring sticky expansion of aerobic granular sludge. According to the method, by appropriately increasing the concentration of metal ions Ca<2+>, Mg<2+> and Fe<2+> in inlet water of an aerobic granular sludge reactor, the micro-organism flocculation is facilitated on the surface of a compressive cell by virtue of double electrode layers, the secretion of hydrophobic extracellular proteins (PN) is increased, so that the sticky expansion problem of the granular sludge occurring in the long-term operation process can be solved. The granular sludge SVI having the sticky expansion can be reduced to 20 to 40 mL/g, and a stable structure and sedimentation performance of the granular sludge can be restored.

Description

technical field [0001] The invention relates to a method for repairing viscous expansion of aerobic granular sludge and belongs to the technical field of wastewater biological treatment. Background technique [0002] Aerobic granular sludge is a special form of biological aggregate formed by aerobic sludge microorganisms through self-aggregation, and its granulation process involves biological, physical, chemical and other processes. Compared with ordinary activated sludge, aerobic granular sludge has the advantages of compact structure, excellent settling performance, large biomass, strong resistance to impact load, and rich microbial population, which makes up for the process defects of traditional activated sludge and becomes a wastewater biological Deal with new hotspots in field research. Since the discovery of aerobic sludge granulation in an upflow aerobic sludge bed reactor in 1991, researchers at home and abroad have studied the formation mechanism, physical and ch...

Claims

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Application Information

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IPC IPC(8): C02F3/12C02F101/16
CPCC02F3/12C02F2003/001C02F2101/16C02F2303/14Y02W10/10
Inventor 董晶晶朱亮吴迪徐向阳
Owner ZHEJIANG UNIV
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