A method of electrocoalescence enhanced nano-adsorption precipitation sewage treatment

A sewage treatment method and nano-adsorption technology, applied in sedimentation treatment, water/sewage treatment, water/sewage multi-stage treatment, etc., can solve the problem of frequent backwashing and regeneration of the filtration system, failure to separate and remove pollutants, and easy blockage of filtration. system and other problems, to achieve the effect of high promotion and application value, small dosage of pharmaceuticals, and high processing efficiency

Active Publication Date: 2021-12-14
BEIJING INSTITUTE OF PETROCHEMICAL TECHNOLOGY
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Problems solved by technology

However, hydrated metal oxide nanoparticles are difficult to be directly applied to sewage treatment, which mainly has the following problems: ①The particle size of hydrated metal oxide nanoparticles is small, and it is easy to be lost with water during sewage treatment, which makes the adsorption pollution The hydrated metal oxide nanoparticles of pollutants are not easy to precipitate and separate, and the purpose of separating and removing pollutants in water cannot be achieved.
②The hydrated metal oxide nanoparticles added in the sewage treatment process are easy to block the filter system at the back end, rapidly increasing the head loss, resulting in frequent backwashing and regeneration of the filter system
③ A small amount of nanoparticles may remain in the treated water, which may affect ecological security after discharge

Method used

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  • A method of electrocoalescence enhanced nano-adsorption precipitation sewage treatment
  • A method of electrocoalescence enhanced nano-adsorption precipitation sewage treatment

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Experimental program
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Embodiment approach

[0032] (1) In step A, the hydrated metal oxide nanoparticles are at least one of hydrated iron oxide nanoparticles, hydrated manganese oxide nanoparticles or hydrated iron manganese oxide nanoparticles. The particle diameter of the hydrated metal oxide nanoparticles is below 200 nanometers; the dosage of the hydrated metal oxide nanoparticles is less than 250 mg / L. FeCl 3 The dosage is less than 50mg / L. The reaction time of nano-adsorption is 15-30 minutes.

[0033] (2) In step B, the anode plate and the cathode plate of the electric coalescence reactor are both made of metal titanium electrodes, the working current is direct current, the working voltage is 5-10V, and the reaction time is 5-10 minutes.

[0034] (3) In step C, the precipitation reactor adopts the method of inclined plate precipitation, and the hydraulic retention time is 1-2 hours.

[0035] (4) In step D, the electrocoalescence operation for a certain period of time usually refers to the continuous operation...

Embodiment 1

[0045] The water quality of a certain arsenic-containing sewage is shown in Table 1 below:

[0046] Table 1

[0047] serial number index value 1 pH value 4～5 2 Total salt content (mg / L) 2300～3000 3 Arsenic (mg / L) 0.53

[0048] The arsenic-containing sewage is treated by using the electric coalescence enhanced nano-adsorption precipitation sewage treatment method provided by the present invention, which may specifically include the following steps:

[0049] Step A, nano-adsorption: add NaOH solution with a concentration of 5% to the sewage, adjust the pH value of the sewage to 7, and then add hydrated iron oxide nanoparticles (HFO) and FeCl to the sewage 3 , the average particle size of hydrated iron oxide nanoparticles is 173nm, the dosage of hydrated iron oxide nanoparticles is 65mg / L, FeCl 3 The dosage is 20-50mg / L, and then stirred and reacted for 15 minutes, so that the pollutants in the sewage are adsorbed on the hydrated metal oxi...

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Abstract

The invention discloses a treatment method for electric coalescence enhanced nano-adsorption precipitation sewage, comprising: nano-adsorption: adjusting the pH value of the sewage to 6-8, and then adding hydrated metal oxide nanoparticles and FeCl to the sewage 3 , so that the pollutants in the sewage are adsorbed on the hydrated metal oxide nanoparticles; electric coalescence: the sewage after the nano-adsorption is passed into the electric coalescence reactor, and the electric coalescence is carried out under the condition of a low-voltage direct current electric field, so that the adsorbed pollutants The hydrated metal oxide nanoparticles are agglomerated with each other to form agglomerated and enlarged hydrated metal oxide nanoparticle clusters; Precipitation: the sewage after electric coalescence is passed into the precipitation reactor to precipitate the hydrated metal oxide nanoparticle clusters, So as to realize the separation and removal of pollutants in sewage. The invention can make the hydrated metal oxide nanoparticles adsorbed with pollutants easy to precipitate and separate, realize efficient removal of pollutants in water, and has the advantages of small dosage of chemicals, high treatment efficiency, small amount of sludge generation and fast reaction speed.

Description

technical field [0001] The invention relates to the field of sewage treatment, in particular to an electric coalescence enhanced nano-adsorption precipitation sewage treatment method. Background technique [0002] Hydrated metal oxide nanoparticles have a strong adsorption effect on many types of pollutants in water. Existing studies have shown that nanoparticles of metal oxides such as nano-hydrated iron oxide, nano-hydrated manganese oxide, and nano-iron-manganese composite metal oxides have high adsorption capacity for various pollutants such as arsenic, phosphorus, mercury, and thallium in water. It has high application potential for deep removal of pollutants. However, hydrated metal oxide nanoparticles are difficult to be directly applied to sewage treatment, which mainly has the following problems: ①The particle size of hydrated metal oxide nanoparticles is small, and it is easy to be lost with water in the process of sewage treatment, which makes the adsorption poll...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/12C02F101/20
CPCC02F9/00C02F1/66C02F1/281C02F1/469C02F2001/007C02F2001/46119C02F2001/46133C02F2101/20
Inventor 胡建龙陈家庆刘帆
Owner BEIJING INSTITUTE OF PETROCHEMICAL TECHNOLOGY
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