Heavy metals-tolerant bacterial agent, preparation method thereof and application of heavy metals-tolerant bacterial agent in wastewater treatment

A technology of heavy metal and bacterial agents, which is applied in heavy metal-resistant bacterial agents, preparation, and sewage treatment. It can solve the problems of weak resistance to environmental impact, high requirements for storage conditions, and poor ecological stability. It achieves fast sedimentation rate, Effect of tolerance to heavy metal ions and improvement of tolerance

Inactive Publication Date: 2019-06-18
SHENZHEN QINGYAN ENVIRONMENTAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Its disadvantages are: (1) the bacterial flora structure in the bacterial agent is single, the ecological stability is poor, the ability to resist environmental impact is weak, and it is easily inhibited by other environmental microorganisms and loses its activity; The removal ability cannot avoid the negative impact of heavy metals on the sludge system; (3) the bacterial agent has low strength, is easily polluted, and has high requirements for storage conditions; (4) the bacterial agent dissolves immediately in the sewage and cannot be recycled, and the application cost is high

Method used

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  • Heavy metals-tolerant bacterial agent, preparation method thereof and application of heavy metals-tolerant bacterial agent in wastewater treatment
  • Heavy metals-tolerant bacterial agent, preparation method thereof and application of heavy metals-tolerant bacterial agent in wastewater treatment
  • Heavy metals-tolerant bacterial agent, preparation method thereof and application of heavy metals-tolerant bacterial agent in wastewater treatment

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] The skeleton network of the heavy metal-resistant bacterial agent is composed of sodium alginate, sodium bicarbonate, diatomaceous earth, ammonia water and calcium nitrate, and its mass ratio is 42:16:24:2:16; Layer network, distribution of a large number of inorganic mineral particles.

[0047] The microbial agent is embedded with microorganisms that can efficiently remove organic matter, ammonia nitrogen and total nitrogen in sewage. The prepared bacterial agent is in the shape of grayish-yellow microspheres, with a density slightly higher than that of water. The sedimentation rate in water is fast and the solid-liquid separation efficiency is high; The bacteria agent particles uniformly distribute a large number of calcium ions in the internal space, which can interact with heavy metal ions (Cu 2+ , Zn 2+ , Cd 2+ ) undergoes ion exchange, thereby fixing heavy metal ions to the internal network of the bacterial agent, protecting the microbial activity embedded insid...

Embodiment 2

[0056] The heavy metal-resistant bacterial agent is prepared according to the preparation method described in Example 1 to obtain the heavy metal-resistant bacterial agent;

[0057] The difference from Example 1 is that the present embodiment specifically describes the application of the heavy metal-resistant bacterial agent in the biofilm method, including the following steps:

[0058] 1) Use plexiglass to make a rectangular reactor with a volume of 110 liters without a cover, and use a peristaltic pump to add 100 liters of fresh urban sewage containing heavy metal pollution to the reactor (influent water quality requirements: COD Cr 150-250 mg / L, ammonia nitrogen 20-30 mg / L, Cu 2+ Less than 100 mg / liter, and add 1 liter of gel microspheres obtained in Example 1;

[0059] 2) A silicone aeration head with a diameter of 90 mm is placed in the center of the bottom of the reactor, and compressed air is supplied by an air compressor pump, and the aeration rate is adjusted to 50 ...

Embodiment 3

[0063] The heavy metal-resistant bacterial agent is prepared according to the preparation method described in Example 1 to obtain the heavy metal-resistant bacterial agent;

[0064] The difference from Examples 1 and 2 is that the present embodiment specifically describes the application of the heavy metal-resistant bacterial agent in the activated sludge process, including the following steps:

[0065] 1) Use plexiglass to make a rectangular reactor with a volume of 110 liters without a cover, and use a peristaltic pump to add 100 liters of fresh urban sewage containing heavy metal pollution to the reactor, and the quality of the influent water is: COD Cr 200-600 mg / L, ammonia nitrogen 20-80 mg / L, Cu 2+ <250 mg / L;

[0066] 2) add 200 milliliters of gel microspheres that obtain in embodiment 1 in the reactor, and 30L are collected from the activated sludge of city sewage treatment plant aeration tank;

[0067] 3) A silicone aeration head with a diameter of 90 mm is placed i...

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Abstract

The invention relates to a heavy metals-tolerant bacterial agent, a preparation method thereof and application of the heavy metals-tolerant bacterial agent in wastewater treatment. The preparation method comprises (1), aerating and domesticating activated sludge via synthetic distributed water; (2) centrifuging the sludge mixed liquid in a centrifuge at room temperature, removing supernate, addingdeionized water, suspending in a vortex oscillator, mixing well, centrifuging again, washing with water, and mixing well; (3) centrifuging the sludge suspension at room temperature, removing supernate, adding sodium alginate solution and sodium bicarbonate solution in sequence under stirring, adding pre-dried diatomite, stirring in a water bath at 35 DEG C for 2 hours to obtain a mixed liquid A;(4) preparing calcium nitrate solution having the mass concentration of 0.02-0.04 g/ml, adding ammonia water having the mass concentration of 0.002-0.008 g/ml slowly, and stirring well to obtain a mixed liquid B; (5) adding the mixed liquid A of (3) into the mixed liquid B of (4), and stirring bacterial agent microspheres in the mixed liquid B overnight; (6) filtering gel of (5) with a screen, andwashing with deionized water to obtain the bacterial agent in microsphere form.

Description

technical field [0001] The invention relates to the field of preparation and application of an immobilized microbial sewage treatment bacterial agent, in particular to a heavy metal-resistant microbial agent, a preparation method and its application in sewage treatment. Background technique [0002] In recent years, enterprises in mining, electroplating, metal processing and other industries have grown rapidly. The heavy metal wastewater generated in the production and processing process is often connected to the municipal pipe network without effective treatment, and discharged into the municipal sewage treatment plant together with domestic sewage. Due to the high levels of heavy metal ions in these waste water, they are highly toxic to activated sludge after entering the traditional biochemical sewage treatment unit, inhibiting microbial metabolism, destroying sludge flocculation and sedimentation, seriously affecting the removal of organic matter and ammonia nitrogen, and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/34C02F101/16C02F101/30
CPCC02F3/34C02F2101/16C02F2101/30
Inventor 李贇刘淑杰陈福明陈光跃
Owner SHENZHEN QINGYAN ENVIRONMENTAL TECH CO LTD
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