A method for synergistic and low-consumption removal of multi-pollutants in nitrogen fertilizer wastewater

A technology for pollutants and waste water, applied in the direction of water pollutants, chemical instruments and methods, water/sewage multi-stage treatment, etc., can solve the problems of high cost and high energy consumption, reduce energy consumption and material consumption, and improve process applicability Effects on sex and flexibility

Active Publication Date: 2021-11-02
ZHENGZHOU UNIVERSITY OF LIGHT INDUSTRY
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  • Claims
  • Application Information

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Problems solved by technology

[0004] The present invention aims to solve the technical problems of high cost and high energy consumption in the existing nitrogen fertilizer production wastewater treatment method, and provides a method for synergistically and low-consumption removal of multiple pollutants in nitrogen fertilizer wastewater. This process can realize low carbon ratio of influent High-efficiency removal of multiple pollutants under high conditions while reducing energy consumption

Method used

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  • A method for synergistic and low-consumption removal of multi-pollutants in nitrogen fertilizer wastewater

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specific Embodiment approach 1

[0016] Specific embodiment one: the collaborative low-consumption method of this embodiment removes multi-pollutants in nitrogenous fertilizer wastewater, comprising the following steps:

[0017] 1. Nitrogen fertilizer wastewater is pumped into the anaerobic digestion reactor directly or after pretreatment. The reactor is a sealed sequencing batch reactor (SBR) with mechanical stirring and a gas collection device at the top; the reaction cycle is: Water for 0.5-1h, stirring for 20-24h, standing still for 0.5-1h, draining for 0.5-1h, water exchange ratio of 60%-80%; during operation, the temperature in the anaerobic digestion reactor is 20-40°C, and the pH is 7.0 ~8.0, the sludge concentration is 7000~9000mg / L; at this stage, 60~80% of organic matter and 70~90% of sulfur-containing pollutants in the wastewater are under the action of methanogenic bacteria and sulfate reducing bacteria in the sludge be removed;

[0018] 2. The effluent from the anaerobic digestion reactor enter...

specific Embodiment approach 2

[0020] Specific embodiment two: the difference between this embodiment and specific embodiment one is the pretreatment described in step one, when the anaerobic digestion section effluent COD of step one is higher than 80mg / L, enable the forward osmosis unit, first Low-concentration nitrogen fertilizer wastewater is concentrated; others are the same as the specific embodiment one.

specific Embodiment approach 3

[0021] Specific embodiment three: the difference between this embodiment and specific embodiment two is that the forward osmosis unit uses a cellulose triacetate (CTA) membrane with a thickness of 50-80 μm and a pore size of 0.2-0.35 nm as the permeable membrane; mol / L NaCl is used as the driving solution, and the concentration ratio is controlled at 2 to 5 times; the others are the same as in the second embodiment.

[0022] In this embodiment, the waste water is concentrated by relying on the pressure difference on both sides of the permeable membrane as the driving force.

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Abstract

A method for synergistic and low-consumption removal of multi-pollutants in nitrogen fertilizer wastewater, which relates to a wastewater treatment method, and it is to solve the technical problems of high cost and high energy consumption of the existing nitrogen fertilizer wastewater treatment method, the method: one, nitrogen fertilizer Anaerobic digestion treatment of wastewater directly or after pretreatment to remove most of the organic matter and sulfur-containing pollutants in the wastewater; 2. Adjust the pH value; 3. Autotrophic denitrification treatment to pollute the remaining organic matter, sulfide and ammonia nitrogen synergistic removal. The pretreatment is to carry out forward osmosis concentration treatment. The indicators of effluent treated by the method of the present invention are: COD<50mg / L, ammonia nitrogen<15mg / L, total nitrogen<25mg / L, sulfide<0.5mg / L. It can be used in the field of wastewater treatment.

Description

technical field [0001] The invention belongs to the field of industrial waste water pollutant control, and in particular relates to a process for removing multi-pollutants in nitrogen fertilizer waste water in cooperation and low consumption. Background technique [0002] my country is a big producer of chemical fertilizers, and its output ranks first in the world, mainly including nitrogen fertilizer, phosphorus fertilizer and potassium fertilizer, among which nitrogen fertilizer is one of the main products of chemical fertilizer in my country. caused serious pollution. A large amount of pollutants discharged into the water will not only cause serious damage to the ecological environment, but will eventually accumulate in the human body through the food chain, endangering human health. [0003] With the promulgation of a series of laws and regulations such as the national "Water Pollution Prevention and Control Plan", the discharge standards and total discharge requirements...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/14C02F101/30C02F101/16C02F101/10
Inventor 张肖静陈召宋亚丽张楠庞启谢旭扬李英哲耿广磊孙高超黄亚宁马永鹏贾金平
Owner ZHENGZHOU UNIVERSITY OF LIGHT INDUSTRY
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