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A red mud leachate wastewater treatment process

A wastewater treatment and leachate technology, applied in water/sludge/sewage treatment, sludge treatment, multi-stage water treatment, etc., can solve the problem of ineffective removal of red mud toxic ions, consumption of large inorganic or organic acids, and cost Difficult to control and other issues, to achieve the effect of avoiding environmental risks, low cost, and easy large-scale application

Active Publication Date: 2020-10-16
LUOYANG INST OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When using inorganic acid or organic acid neutralization method to treat red mud leachate, because of its high alkalinity and pH value generally exceeding 12.0, a large amount of inorganic acid or organic acid will be consumed, the cost is difficult to control, and the acid neutralization method cannot be effective Remove toxic ions in red mud, but also bring certain environmental risks

Method used

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  • A red mud leachate wastewater treatment process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Take 500mL red mud leachate in a 1L beaker and let it stand for 1h. The sludge sank to the bottom of the beaker, and 450mL of the supernatant was sucked into another 1L beaker. Put two aeration heads connected to the air compressor into the beaker and aerate for 96h. Stop the aeration, put 0.9mL polyacrylamide solution with a mass concentration of 5% into the beaker, stir with a magnetic stirrer, the stirring speed is 60rpm, and the coagulation reaction time is 40min. Stop stirring, let it stand for 180min, and the colloidal substance sinks to the bottom of the cup. Pump the supernatant in the beaker to the activated carbon adsorption column. Collect the liquid flowing out of the activated carbon adsorption column, measure its various indicators, and meet the first-level standard of the "Integrated Wastewater Discharge Standard", and its various effluent water quality indicators: pH is 8.8, SS is 3.7mg / L, chromaticity is 19, As 0.01mg / L, fluoride 0.2mg / L.

Embodiment 2

[0042] Using the red mud leachate wastewater treatment system of the present invention, the treatment mode is continuous water inflow and continuous water outflow, running 24 hours a day, the treatment capacity per hour is 2t, and the daily treatment capacity is 48m 3 / d. The red mud leachate is stored in the regulating tank, and the stirring speed is 30rpm. The red mud leachate in the adjustment tank is continuously pumped into the primary sedimentation tank, and the hydraulic retention time is 40 minutes. The supernatant in the primary sedimentation tank is continuously pumped into the aeration neutralization tank, and the aeration intensity is 25m 3 / m 2 h, the hydraulic retention time is 100h. The red mud leachate in the aeration neutralization tank is continuously pumped into the coagulation tank, the stirring speed is 60rpm, the mass concentration of polyacrylamide solution is 5%, and the dosage of polyacrylamide is 2L / m 3 , The hydraulic retention time is 30min. Th...

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Abstract

The invention discloses a treatment technology of red mud leachate wastewater. The technology comprises the following steps: pumping red mud leachate into a regulating tank to perform homogenization treatment, and then pumping the red mud leachate into a primary settling tank to preliminarily precipitate solid impurities in the red mud leachate; discharging supernate into an aeration neutralizingtank, and discharging sludge at the bottom of the tank into a sludge concentration tank; reducing pH of red mud leachate in the aeration neutralizing tank to be 9.0 or smaller, and pumping the red mudleachate into a coagulating tank to perform coagu-flocculation reaction; then pumping the red mud leachate into a settling tank to perform solid-liquid separation, pumping the supernate into an adsorption tower, adsorbing the supernate, discharging the red mud leachate into a clean water tank, discharging the red mud leachate, and pumping sludge into the sludge concentration tank; pumping the supernate in the sludge concentration tank into the regulating tank, pumping concentrated sludge into a plate-and-frame filter press, pumping concentrated filtrate into the regulating tank, loading a filter cake into a hazardous waste device, and outward transporting or recycling metal elements in the filter cake. The technology adopts a combined technology of aeration neutralization, coagulating sedimentation and physical absorption to treat the red mud leachate, is simple in technology, low in cost, and easy for scale promotion and application, and can ensure that the red mud leachate treated through the technology can realize up-to-standard discharge.

Description

technical field [0001] The invention relates to the field of sewage treatment, in particular to a red mud leachate wastewater treatment process. Background technique [0002] Red mud is a solid or semi-solid powder mud solid waste produced by the alumina industry, which is rich in ferric ions and appears red or reddish brown. For every ton of alumina produced, about 1.5 tons of red mud will be produced. As of 2016, the global stockpile of red mud has exceeded 3 billion tons, and it is increasing at a rate of 120 million tons per year. The annual output of red mud in my country has exceeded 60 million tons, and the total stockpiles have exceeded 400 million tons. [0003] Red mud is an industrial solid waste with many undesirable characteristics, such as corrosiveness, saline-alkalinity, leaching toxicity, and radioactivity, etc. The unfavorable characteristics of red mud limit its resource utilization, and the recycling rate of red mud in my country does not exceed 10% of...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/04C02F11/122C02F11/00C02F103/06
CPCC02F1/281C02F1/56C02F1/66C02F9/00C02F11/122C02F2001/007C02F2301/08
Inventor 李辉曲洋田文杰王小庆石犇
Owner LUOYANG INST OF SCI & TECH