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Recycling method and equipment used for nutrient elements in hydrothermal liquefaction wastewater

A technology of hydrothermal liquefaction and nutrient elements, applied in sterilization methods, chemical instruments and methods, and microorganism-based methods, etc., can solve problems such as incomplete degradation of pollutants

Active Publication Date: 2018-03-16
CHINA AGRI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Photosynthetic bacteria are a large group of microorganisms that are similar to microalgae and have two sets of energy synthesis and transformation systems. They can survive under light or aerobic conditions, and have a wide range of utilization of organic matter, high tolerance to organic loads, and flexible metabolic mechanisms. However, its degradation of pollutants is not complete

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  • Recycling method and equipment used for nutrient elements in hydrothermal liquefaction wastewater

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] In this example, the treated hydrothermal liquefaction wastewater has an initial COD of 195600 mg / L, a TN concentration of 11900 mg / L, a TP concentration of 1240 mg / L, and a pH value of 12.6.

[0037] Such as figure 1 , the equipment for comprehensive treatment of hydrothermal liquefaction wastewater includes: photosynthetic bacteria incubator 4, microalgae incubator 5, photosynthetic bacteria filter unit, microalgae filter unit, air intake unit;

[0038] The photosynthetic bacteria incubator 4 is a cylindrical light-transmitting plexiglass container, which is provided with a waste water inlet 1 and a water outlet 2. The bottom of the photosynthetic bacteria incubator 4 is provided with an aeration pan 3 for feeding air, and the aeration pan 3 is connected with the air. Gas line 15 is connected. Set the waste water inlet 1 at a distance of 15-20cm from the bottom of the incubator, and set the water outlet 2 at a position slightly higher than the aeration pan (1.5-2cm f...

Embodiment 2

[0050] In this example, the initial and diluted properties of the treated hydrothermal liquefaction wastewater are the same as in Example 1, and the same equipment as in Example 1 is used, and the comprehensive treatment steps are as follows:

[0051] 1. Through the water pump, pump the hydrothermal liquefaction waste water, dilution water and photosynthetic bacteria liquid from the water inlet 1 to the photosynthetic bacteria incubator 4, control the total volume of the three liquids to be about 2 / 3 of the photosynthetic bacteria incubator 4, and the photosynthetic bacteria incubator 4 The bacterial inoculation amount is 0.25g / L dry weight, and the pH value in the wastewater is adjusted to 7.0;

[0052] Two, open the air compressor 13, open the air pressure control valve, adjust the rotameter 9, make the air enter the photosynthetic bacteria cultivator 4 through the air intake pipeline 15 and the aeration disc 3, mix the photosynthetic bacteria in the waste water, control The...

Embodiment 3

[0062] In this example, the initial and diluted properties of the treated hydrothermal liquefaction wastewater are the same as in Example 1, and the same equipment as in Example 2 is used, and the comprehensive treatment steps are as follows:

[0063] 1. Through the water pump, pump the hydrothermal liquefaction waste water, dilution water and photosynthetic bacteria liquid from the water inlet 1 to the photosynthetic bacteria incubator 4, control the total volume of the three liquids to be about 2 / 3 of the photosynthetic bacteria incubator 4, and the photosynthetic bacteria incubator 4 The bacterial inoculation amount is 0.30g / L dry weight, and the pH value in the wastewater is adjusted to 7.0;

[0064] Two, open the air compressor 13, open the air pressure control valve, adjust the rotameter 9, make the air enter the photosynthetic bacteria cultivator 4 through the air intake pipeline 15 and the aeration disc 3, mix the photosynthetic bacteria in the waste water, control The...

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Abstract

The invention provides a method for reclaiming and using nutrient elements in hydrothermal liquidation waste water. The method comprises the following steps that (1) the waste water which is generated by making biological crude oil by a hydrothermal liquidation method is diluted by water until the concentration of COD (chemical oxygen demand) is 18,000 to 20,000mg / L; (2) a photosynthetic bacterium is inoculated into the waste water to culture; (3) after being cultured for 11 to 13 days, the waste water is separated by an ultra-filtration membrane; (4) microalgae are inoculated in the separated water, at daytime, CO2 and air-mixed gas are filled into the water to continuously culture for 6 to 8 days. The method of combining the photosynthetic bacterium and the microalgae to reclaim the nutrient elements in the hydrothermal liquidation waste water and reclaim a water resource is provided for the first time, the current gap of treating the hydrothermal liquidation waste water is solved, organics, nitrogen and phosphorus in the waste water can be degraded and reclaimed, biomass materials can also be produced to be applied to hydrothermal liquidation to produce crude oil, meanwhile, the reclaimed water can serve as the dilution water for the primary hydrothermal liquidation waste water, and the functions of protecting environment, reclaiming the organics and the water resource, and producing biomasses are realized.

Description

technical field [0001] The invention belongs to the field of waste water treatment and recycling, and in particular relates to a method and equipment for treating waste water with microorganisms. Background technique [0002] Hydrothermal liquefaction wastewater is wastewater generated during the process of converting microalgae, kitchen waste, and pig manure into bio-crude oil by thermochemical methods. The wastewater is rich in constant elements such as carbon, nitrogen, and phosphorus, and phenols, polycyclic aromatic hydrocarbons, The new type of toxic and harmful wastewater has complex components. Among them COD, TN, NH 3 -N, TP can be as high as 200000, 14000, 8000, 2000mg / L respectively. At present, there is no mature treatment technology and method for hydrothermal liquefaction wastewater, and the research on the treatment of this wastewater is still in the pilot stage. Due to the high concentration of pollutants in wastewater and a large number of toxic and harmf...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/14C12N1/20C12N1/12C12M1/12C12M1/04C12M1/00C12R1/01
Inventor 卢海凤袁国洋黄仕伟张源辉李保明赵煜
Owner CHINA AGRI UNIV
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