Resource recycling method of chlor-alkali wastewater

A recycling and waste water technology, which is applied in chemical instruments and methods, alkali metal compounds, alkali metal oxides/hydroxides, etc., can solve the problems of resource recycling and resource waste of difficult chlor-alkali wastewater

Pending Publication Date: 2022-04-29
YUNNAN UNIV
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

However, the above-mentioned treatment methods are difficult to realize resource recovery and utilization of chlor-alkali wastewater, resulting in waste of resources

Method used

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  • Resource recycling method of chlor-alkali wastewater

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preparation example Construction

[0042] After obtaining the pH adjusted wastewater, the invention mixes the pH adjusted wastewater with the magnetic mercury adsorbent for solid-liquid separation after adsorption to obtain mercury removal wastewater and mercury magnetic mercury adsorbent. In the invention, the preparation method of the magnetic mercury adsorbent preferably comprises the following steps: filtering, distilling, deodorizing and decolorizing the kitchen waste oil in turn to obtain the refined kitchen waste oil; The refined kitchen waste oil, sulfur powder and Fe 3 O 4 @SiO 2 The magnetic mercury adsorbent was obtained by the mixed reaction of nanoparticles. In the invention, the sulfur powder, refined kitchen waste oil and Fe 3 O 4 @SiO 2 The mass ratio of nanoparticles is preferably 10 ~ 12:4 ~ 6:1, more preferably 10.5 ~ 11.5:4.5 ~ 5.5:1. In the invention, the magnetic mercury adsorbent is preferably prepared according to the method disclosed in Chinese patent cn111167424a, which will not be repeate...

Embodiment 1

[0051] according to Figure 1 Chlor alkali wastewater treatment is carried out according to the flow chart shown in.

[0052] (1) Adjust pH

[0053] Taking a Chlor Alkali Company in Yunnan as an example, the pH value of chlor alkali wastewater is monitored in real time by pH analyzer, and 1m is taken 3 Chlor alkali wastewater (mass: 1.56 tons), under the condition of room temperature, adjust the pH value to 6.5 by adding quicklime to obtain pH adjusted wastewater; Among them, the amount of limestone is 550.0kg.

[0054] (2) Adsorption magnetic separation

[0055] The pH adjusted wastewater is introduced into the chemical reaction tank, 30.0kg magnetic mercury adsorbent is added, mixed evenly, adsorbed at room temperature for 24h, and passed through Hg 2+ Real time monitoring of Hg in solution by content analyzer 2+ Content, then flow into the high gradient magnetic separator at the flow rate of 1.3m / min, and separate by magnetic separation under the condition of 5kgs to obtain Hg a...

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Abstract

The invention provides a resource recycling method of chlor-alkali wastewater, and belongs to the technical field of wastewater treatment. The method comprises the following steps: adjusting the pH value of the chlor-alkali wastewater to 6-7, and then mixing the chlor-alkali wastewater with a magnetic mercury adsorbent for adsorption to obtain mercury-removed wastewater and a mercury-magnetic mercury adsorbent; carrying out desorption adsorption on the mercury-magnetic mercury adsorbent to obtain a recovered magnetic mercury adsorbent and a mercury ion solution; sequentially carrying out organic pollutant removal treatment, free chlorine removal and magnesium precipitation reaction on the mercury-removed wastewater to obtain magnesium hydroxide and magnesium-removed wastewater; carrying out calcium precipitation reaction on the magnesium-removed wastewater to obtain calcium carbonate and calcium-removed wastewater; and collecting brine from the calcium-removed wastewater to obtain light salt brine. The mercury ion solution (used for preparing mercury salt), magnesium hydroxide (used as a flame retardant, a neutralizer and a flue gas desulfurizer and used for preparing calcium carbonate and magnesium salt), calcium carbonate (used as a pigment filler, a raw material of optical neodymium glass and flux limestone in metallurgical industry) and light salt brine (used for brine mining) obtained by the method can realize full utilization of resources in chlor-alkali wastewater.

Description

technical field [0001] The invention relates to the technical field of wastewater treatment, in particular to a resource recovery and utilization method of chlor alkali wastewater. Background technology [0002] Chlor alkali industry is a basic chemical industry and plays an important role in the national economy and national defense construction. However, the wastewater produced by chlor alkali industry has the characteristics of complex water quality components, high salt content, high chloride ion content, many pollutants and poor biodegradability. If targeted treatment measures are not taken, it will seriously harm the environment, including wasting resources, damaging soil quality and causing serious environmental problems. [0003] Chinese patent cn1108138a discloses a chlor alkali wastewater treatment method, which specifically comprises the following steps: Step 1: deliver the chlor alkali wastewater to the wastewater treatment device for treatment to eliminate organic ma...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/08B01J20/30B01J20/10B01J20/28C01F5/22C01F11/18C02F103/34
CPCC02F1/66C02F1/488C02F1/281C02F1/58C02F1/5236C02F1/705B01J20/103B01J20/28009C01F5/22C02F2103/34B01J2220/4875
Inventor 华文婷汤立红吴昊天
Owner YUNNAN UNIV
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