Method for promoting formation of anaerobic granular sludge

Abstract

The invention belongs to the field of wastewater treatment, and particularly relates to a method for promoting formation of anaerobic granular sludge, which comprises the following steps: 1) adding an iron-based material into an anaerobic reactor, and adding sludge; 2) pumping synthetic wastewater into the anaerobic reactor, and starting the anaerobic reactor; and 3) when gas production and water outgoing are stable in the reaction, and the measured volatile suspended matter of the granular sludge accounts for 70-90% of the total suspended matter mass of the sludge, determining that the granular sludge is mature, stopping running of the reactor, and recovering mature granular sludge. The iron-based material added in the invention has a large specific surface area, which is beneficial to enrichment of anaerobic microorganisms on the surface of the iron-based material so as to form a sludge aggregate. The iron-based material is close to mature granular sludge in density and can float up and down in the anaerobic reactor, so that sludge deposition caused by increase of the volume weight of the sludge is avoided. The iron-based material is used as a core, so that the mechanical property of the anaerobic granular sludge is improved.

Description

technical field

[0001] The invention belongs to the field of wastewater treatment, and in particular relates to a method for promoting the formation of anaerobic granular sludge. Background technique

[0002] The rapid development of anaerobic biological treatment technology has been widely used in the field of organic wastewater treatment. Compared with aerobic biological treatment, anaerobic biological treatment technology is low in cost, can recover part of energy in the form of methane, can withstand large organic loads, and can process some organic substances that are difficult to biodegrade under aerobic conditions. waste water treatment technology.

[0003] Due to the long generation cycle and low proliferation rate of some anaerobic microorganisms, the problem of long start-up period is common in anaerobic reactors. In general, the start-up time of anaerobic reactors takes several months or even longer, which limits the popularization and application of anaerobic b...

Examples

Embodiment 1

[0042] In two UASB reactors A and B with a diameter of 60 cm and a total volume of 7.5 L, 3.5 L of anaerobic sludge from an urban sewage treatment plant was inoculated, the parameters are shown in Table 1, and the influent was synthetic wastewater (Table 2 ), the reaction temperature is controlled at 35-37°C. In the anaerobic reactor A, the feeding diameter is 3-4mm and the density is 1.2g / cm 3 The hollow iron ball, the dosage is 50g / L. Anaerobic reactor type B does not add hollow iron balls, and other parameters are consistent with A. Each anaerobic reactor was inoculated with 2.5L sludge, the initial hydraulic retention time was 12h, and the reflux ratio was controlled to be 0.6 so that the rising velocity of the influent was 0.1m / h. After 10 days, the hydraulic retention time is still 12h, the reflux ratio is increased to 1.2, and the ascending flow rate is increased to 0.2m / h. On the 20th day of the reaction, the operation was suspended, and the granular sludge was reco...

Embodiment 2

[0052] In two diameters of 300cm, with a total volume of 2m 3 In the UASB reactors A and B, the anaerobic sludge from the urban sewage treatment plant was inoculated. The parameters are shown in Table 1. The influent was diluted chicken farm wastewater with high nitrogen and phosphorus content. The specific components As in Table 4. In the anaerobic reactor A, add PCV plastic balls (diameter 1-2mm, density 1.1g / cm2) with magnet ore powder coating on the surface 3 ), the dosage is 40g / L. No plastic pellets are added to anaerobic reactor B, and other parameters are consistent with A. Each anaerobic reactor was inoculated with 0.5m 3 For sludge, the initial hydraulic retention time is 12h. At the initial stage of start-up, the reflux ratio is controlled to be 0.6 so that the rising velocity of the influent water is 0.1m / h. After 10 days, the hydraulic retention time was maintained at 12h, the reflux ratio was increased to 1.2, and the ascending flow rate was increased to 0.2...

Embodiment 3

[0059] In two diameters of 120cm and a total volume of 1.5m 3 In the UASB reactors A and B, the anaerobic sludge from the urban sewage treatment plant was inoculated, and its parameters are shown in Table 1. In the anaerobic reactor A, the feeding diameter is 3-4mm and the density is 1.1-1.2g / cm 3 Hollow stainless steel balls, the dosage is 60g / L. There is no addition in anaerobic reactor B, and other parameters are consistent with A. Each anaerobic reactor was inoculated with 2.5m 3 Sludge, the reaction runs for a total of 42 days, divided into start-up phase (1-7 days) and acclimation phase (8-42 days). In the start-up stage, the influent water is synthetic wastewater (see Table 2), the hydraulic retention time is 24h, and the reflux ratio is controlled to be 0.6 in the initial stage of start-up so that the influent flow rate is 0.1m / h. During the acclimatization stage, the influent was simulated pesticide chemical factory phenazine-containing wastewater (see Table 6), t...

technical field

[0001] The invention belongs to the field of wastewater treatment, and in particular relates to a method for promoting the formation of anaerobic granular sludge. Background technique

[0002] The rapid development of anaerobic biological treatment technology has been widely used in the field of organic wastewater treatment. Compared with aerobic biological treatment, anaerobic biological treatment technology is low in cost, can recover part of energy in the form of methane, can withstand large organic loads, and can process some organic substances that are difficult to biodegrade under aerobic conditions. waste water treatment technology.

[0003] Due to the long generation cycle and low proliferation rate of some anaerobic microorganisms, the problem of long start-up period is common in anaerobic reactors. In general, the start-up time of anaerobic reactors takes several months or even longer, which limits the popularization and application of anaerobic b...

Examples

Embodiment 1

[0042] In two UASB reactors A and B with a diameter of 60 cm and a total volume of 7.5 L, 3.5 L of anaerobic sludge from an urban sewage treatment plant was inoculated, the parameters are shown in Table 1, and the influent was synthetic wastewater (Table 2 ), the reaction temperature is controlled at 35-37°C. In the anaerobic reactor A, the feeding diameter is 3-4mm and the density is 1.2g / cm 3 The hollow iron ball, the dosage is 50g / L. Anaerobic reactor type B does not add hollow iron balls, and other parameters are consistent with A. Each anaerobic reactor was inoculated with 2.5L sludge, the initial hydraulic retention time was 12h, and the reflux ratio was controlled to be 0.6 so that the rising velocity of the influent was 0.1m / h. After 10 days, the hydraulic retention time is still 12h, the reflux ratio is increased to 1.2, and the ascending flow rate is increased to 0.2m / h. On the 20th day of the reaction, the operation was suspended, and the granular sludge was reco...

Embodiment 2

[0052] In two diameters of 300cm, with a total volume of 2m 3 In the UASB reactors A and B, the anaerobic sludge from the urban sewage treatment plant was inoculated. The parameters are shown in Table 1. The influent was diluted chicken farm wastewater with high nitrogen and phosphorus content. The specific components As in Table 4. In the anaerobic reactor A, add PCV plastic balls (diameter 1-2mm, density 1.1g / cm2) with magnet ore powder coating on the surface 3 ), the dosage is 40g / L. No plastic pellets are added to anaerobic reactor B, and other parameters are consistent with A. Each anaerobic reactor was inoculated with 0.5m 3 For sludge, the initial hydraulic retention time is 12h. At the initial stage of start-up, the reflux ratio is controlled to be 0.6 so that the rising velocity of the influent water is 0.1m / h. After 10 days, the hydraulic retention time was maintained at 12h, the reflux ratio was increased to 1.2, and the ascending flow rate was increased to 0.2...

Embodiment 3

[0059] In two diameters of 120cm and a total volume of 1.5m 3 In the UASB reactors A and B, the anaerobic sludge from the urban sewage treatment plant was inoculated, and its parameters are shown in Table 1. In the anaerobic reactor A, the feeding diameter is 3-4mm and the density is 1.1-1.2g / cm 3 Hollow stainless steel balls, the dosage is 60g / L. There is no addition in anaerobic reactor B, and other parameters are consistent with A. Each anaerobic reactor was inoculated with 2.5m 3 Sludge, the reaction runs for a total of 42 days, divided into start-up phase (1-7 days) and acclimation phase (8-42 days). In the start-up stage, the influent water is synthetic wastewater (see Table 2), the hydraulic retention time is 24h, and the reflux ratio is controlled to be 0.6 in the initial stage of start-up so that the influent flow rate is 0.1m / h. During the acclimatization stage, the influent was simulated pesticide chemical factory phenazine-containing wastewater (see Table 6), t...

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