DE202016000557U1 - Denitrification Biopolymer Reactor (DBR) - Google Patents

Abstract

Biopolymer fluidized bed reactor (BWR) for denitrification of aquatic process water using PHA and PHB biopolymers, characterized in that, in a closed container, a strong pump in the container provides high buoyancy turbulence which keeps the biopolymers in constant suspension.

Description

Biopolymer fluidized bed reactors (BWR) serve the denitrification of nitrate-containing process water of aquatic systems. Here, carbon-containing biopolymers based on polyhydroxyalkonates (PHA) and polyhydroxybutyrate (PHB) are of central importance.

In contrast to aerobic nitrification, nitrate is bacterial from organic, carbonaceous matter used for energy during denitrification. In doing so, the nitrate is reduced back to molecular nitrogen, which largely escapes into the atmosphere. Many aerobic microorganisms are able to denitrify after a short adaptation time, provided, except nitrate and nitrite as the electron acceptor, there is a sufficient supply of readily usable organic substances. With too little influx of such substances, a carbon addition for an effective N2 formation is necessary.

When selecting suitable carbon sources, liquids are per se unfavorable because they do not allow bacterial colonization and thus do not allow multiplication by turfing. Carbon sources should preferably contain no heteroatoms, in particular no nitrogen, phosphorus or sulfur atoms, because unwanted parallel reactions can take place. Carbon-rich aromatic systems, such as lignin, could be used for the application, but for steric and structural reasons would slow down the process too much. Low-oxygen molecular structures, such as solid terpenes or higher saturated carboxylic acids, have low polarity regions and are unsuitable for bacterial attack.

Due to the sensitivity of the products, denitrification of aquatic systems should be based on carbon sources with molecular properties that are as uniform as possible, if the denitrification is not hermetically sealed against the breeding process. This prevents uncontrollable side reactions and helps to keep the breeding process constant.

Optimum carbon sources are polyhydroxyalkonoates (PHA) because they are biogenic storage materials themselves, exist as natural polymers in countless variants, consist only of hydrocarbons and carboxylic acid esters, are fully and rapidly degradable due to their perfect chain enzymes, and exist as denitrifiers since the beginning of life ,

• 1. Anaerober Betrieb
• 2. Trennung vom Zuchtprozess durch Bypassbetrieb
• 3. Nach Einfahrzeit hohe Verweildauer im Reaktor (4–5 h)
• 4. Starke Verwirbelung der Biopolymere zur Vermeidung von Klumpenbildung
• 5. Prozesssteuerung mittels Redox-Sonde im Reaktor.

The BWR reactor described here must fulfill the following conditions:

• 1. Anaerobic operation
• 2. Separation of the breeding process by bypass operation
• 3. After start-up time high residence time in the reactor (4-5 h)
• 4. Strong turbulence of biopolymers to avoid lumping
• 5. Process control by means of redox probe in the reactor.

LIST OF REFERENCE NUMBERS

1

Biopolymer fluidized bed reactor

2

transport pump

3

Redox probe

4

Supply of vortex pump

5

Return to the vortex pump

6

perforated plates

7

biopolymers

8th

Process water return to the separator

9

prefilter

10

Process water supply from the separator

11

vortex pump

12

Screw-in reactor closure

13

Screwable pipe connections

14

Buoyancy flow for biopolymer turbulence

Claims (5)

Biopolymer fluidized bed reactor (BWR) for denitrification of aquatic process water using PHA and PHB biopolymers, characterized in that, in a closed container, a strong pump in the container provides high buoyancy turbulence which keeps the biopolymers in constant suspension. Biopolymer fluidized bed reactor (BWR) for the purpose of denitrification of aquatic process water using PHA and PHB biopolymers according to claim 1, characterized in that the (usually round) container is hermetically sealed. Biopolymer fluidized bed reactor (BWR) for the purpose of denitrification of aquatic process water using PHA and PHB biopolymers according to claim 1, characterized in that the container is operated separately from the breeding process in the bypass. Biopolymer fluidized bed reactor (BWR) for the purpose of denitrification of aquatic process water Use of PHA and PHB biopolymers according to claim 1, characterized in that the process water in the container a high residence time (at least 4-5 h) remains. Biopolymer fluidized bed reactor (BWR) for the purpose of denitrification of aqueous process water using PHA and PHB biopolymers according to claim 1, characterized in that the denitrification is monitored and controlled with a redox probe and a corresponding controller.

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