Duplex reactor system for removal of tebuconazole and method thereof

Patent metadata

Field	Value
Publication number	US-9879220-B2
Application number	US-201515114225-A
Country	US
Kind code	B2
Filing date	Jul 13, 2015
Priority date	Sep 19, 2014
Publication date	Jan 30, 2018
Grant date	Jan 30, 2018

Abstract

Implementations herein relate to systems and methods for removal of tebuconazole from water using a duplex reactor. Water samples containing tebuconazole enter a double sandwich of the duplex reactor, and then enter a reactor inner shell of the duplex reactor through a water distributor. In the duplex reactor, the tebuconazole is removed by adsorption resins loaded with microorganisms. After the removal, a concentration of the tebuconazole in adsorption effluent is below the standard limit of the national pesticide wastewater discharge. The microorganisms loaded on the resins use organic carbon (e.g., tebuconazole) in water as a carbon source and degrade tebuconazole that is absorbed by the resins. The systems and methods not only solve problems associated with conventional techniques (e.g., poor water quality fluctuations and lacking of time long degradation), but also address issues associated with resin adsorption methods (e.g., secondary pollution derived from resins regeneration).

First claim

What is claimed is:

1. A duplex reactor for removal of tebuconazole from water, the duplex reactor comprising:
a reactor shell;
a reactor inner shell;
an inlet pipe;
a water distributor;
an outlet pipe;
an aeration tube;
an aeration head;
an exhaust pipe;
a gas gathering reflective cone;
a honeycomb support frame;
resins loaded with microorganisms;
an inlet pipe for backwashing water; and
an outlet pipe for backwashing water, wherein:
the inlet pipe is located at the top of the duplex reactor and is connected to the reactor shell;
the exhaust pipe is in the vicinity of a conical collection hood and connected to the reactor inner shell;
the outlet pipe is located in an upper part of the reactor, is located in a lower part of the conical collection hood, and connected to the reactor inner shell;
the honeycomb support frame is located in the reactor inner shell filled with the resins loaded with microorganisms;
the water distributor is located at the bottom of the reactor inner shell;
the outlet pipe for backwashing water is located above a layer of the honeycomb support frame and go through the reactor inner shell;
the inlet pipe for backwashing water is located below the water distributor;
the inlet pipe for backwashing water goes through the reactor shell; and
the aeration tube is connected to the aeration head, and the aeration head is located directly above the water distributor.

2. The duplex reactor of the claim 1 , wherein the resins are adsorption resins including a polystyrene backbone or a polyacrylate backbone.

3. The duplex reactor of the claim 1 , wherein the microorganisms loaded on the resins comprises Sphingomonas paucimobilis.

4. A system for removal of tebuconazole, the system comprising:
the duplex reactor of claim 1 ;
a complementary nutrient solution reserve tank;
an inlet water sample adjustment tank;
a backwash effluent collection tank;
a backwash water reserve tank;
a filter;
a flow meter;
a pump; and
an aeration pump, wherein:
the complementary nutrient solution reserve tank and an inlet adjustment tank are connected, and
the duplex reactor is connected to the inlet water sample adjustment tank, the backwash water reserve tank, the backwash effluent collection tank, and the aeration pump.

5. A method using the duplex reactor of claim 4 , the method comprising:
providing the resins loaded with microorganisms by:
(a) inoculating Sphingomonas paucimobilis colonies from plates into culture media including beef peptone, and keeping culture media from light at temperature 28 degrees Celsius,
(b) collecting Sphingomonas paucimobilis by separating the Sphingomonas paucimobilis at a logarithmic growth phase from the culture media by centrifugation and washing the Sphingomonas paucimobilis using a solution containing disodium hydrogen phosphate and potassium dihydrogen phosphate,
(c) loading the resins by placing the collected bacteria into culture media containing minerals, adding the resins to the culture media containing minerals, and shaking the culture media containing minerals for 3-5 days to obtain the resins loaded with microorganisms, and
(d) washing the resins loaded with microorganisms using deionized water and filling the resins into the honeycomb support frame of the duplex reactor;

adding water by adjusting water flow and flow of a complementary nutrient solution, controlling the inlet water sample adjustment tank such that CODCr of water samples is not less than 20 mg/L, allowing the water samples into the inlet pipe of the duplex reactor, and opening the aeration pump;
performing adsorption and bio-degradation of tebuconazole by allowing the water samples pass through the resins, removing tebuconazole from the resins, discharging adsorption of water from the outlet pipe such that the microorganisms are attached to the resins, wherein complementary nutrients and tebuconazole are used as a carbon source by the microorganisms and are bio-degraded, and the water samples are placed in the duplex reactor for at least 30 minutes; and
performing backwashing in 7-10 days after the bio-degradation to reduce death and loss of the microorganisms attached to the resins by closing feed line pumps, valves, and outlet valves, opening valves of the backwash water inlet pipe for backwashing water and the outlet pipe for backwashing water, backwashing the resins for not less than two minutes, placing the backwash water into the backwash water effluent collection tank, discharging the backwash water into a sewage treatment plant, closing the valves of the inlet pipe for backwashing water and the backwash water inlet outlet pipe for backwashing water, and opening the valve and the pump of an inlet water pipeline, and a water inlet valve to continue operations.

6. The method of claim 4 , wherein the resins are adsorption resins including a polystyrene backbone or a polyacrylate backbone.

7. The method of claim 4 , wherein a complementary nutrient solution comprises methanol, ethanol, glucose, or a solution of sodium acetate.

8. The method of claim 4 , wherein the microorganisms are at in a logarithmic growth phase and are separated from culture media by centrifugation for about 20 minutes with a speed of 5000G.

9. The method of claim 4 , wherein pH of the solution containing disodium hydrogen phosphate and potassium dihydrogen phosphate is of 7.3.

Assignees

• Nanjing University Of Technology
• Nanjing Univ Yancheng Environmental Protection Technology And Engineering Research Institute
• Univ Beijing Technology

Inventors

• Wang Jinnan
• Chen Chen
• Wang Dadao
• Tian Shuyan

Classifications

• C02F3/108

  Immobilising gels, polymers or the like · CPC title

• C02F2209/40

  Liquid flow rate · CPC title

• Y02W10/15

  Cross-Sectional Technologies · mapped topic

• C02F3/341

  Consortia of bacteria · CPC title

• C02F2305/06

  Nutrients for stimulating the growth of microorganisms · CPC title