Biological treatment method for removing sulfate radicals and COD in lead-zinc beneficiation wastewater

A technology for mineral processing wastewater and biological treatment, which is applied in mining wastewater treatment, biological water/sewage treatment, and water treatment parameter control. The effect of strong adaptability and strong industrial practicability

Active Publication Date: 2021-09-17
广东中金岭南环保工程有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although there are reports on the methods and techniques for separately handling COD and high-concentration sulfate radicals, at the same time for the lead-zinc beneficiation wastewater containing COD and high-concentration sulfate radicals, there are few known treatment processes, and the effect is unstable or unsatisfactory
Moreover, in mineral processing wastewater, according to the large range of mineral processing sulfate content, when production adjustments or fluctuations occur, its chemical composition also has certain changes. Can reach mineral processing index, therefore, urgently need to develop simpler, environmental protection, fast and efficient lead-zinc mineral processing wastewater treatment method, in order to solve current demand

Method used

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  • Biological treatment method for removing sulfate radicals and COD in lead-zinc beneficiation wastewater
  • Biological treatment method for removing sulfate radicals and COD in lead-zinc beneficiation wastewater
  • Biological treatment method for removing sulfate radicals and COD in lead-zinc beneficiation wastewater

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Experimental program
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Effect test

Embodiment 1

[0041] Embodiment 1. Configuration of sewage treatment system

[0042] 1. Build sewage treatment system hardware

[0043] The sewage storage tank, hydrolytic acidification tank, anaerobic reaction device, aerobic reaction device and secondary sedimentation tank are connected through pipelines.

[0044] 2. Cultivation and domestication of activated sludge

[0045] Obtain raw sludge from the urban sewage treatment plant, inoculate the raw sludge into the anaerobic sludge bed of the anaerobic reaction device, operate the treatment system, and control the sewage conditions entering the anaerobic reaction device: pH6.0~6.2, The carbon-sulfur ratio is 2:1, the temperature is 28-33 degrees Celsius, the SV is 30%, and the oxidation-reduction potential is -290--320. After 30 days of continuous operation, anaerobic sludge is obtained and put into formal use.

[0046] Aerobic sludge is obtained by aeration and domestication of the aforementioned anaerobic sludge, the conditions are ph7...

Embodiment 2

[0053] Taking the mineral processing wastewater discharged from a lead-zinc ore dressing plant as the treatment object, since the treated water sample is the production wastewater of the plant, when the production fluctuates, its chemical composition also has certain changes. The water quality analysis is shown in Table 1:

[0054] Table 1 embodiment 2 handles the water quality analysis table of water sample

[0055] sample name SO 4 2-

Ca 2+

pH value COD Lead-zinc beneficiation wastewater 838～1625 535～1024 7.03～8.09 237～446

[0056] Specifically, the biological treatment method for removing sulfate radicals and COD in the lead-zinc mineral processing wastewater in the present embodiment comprises the following steps:

[0057] Step 1: In order to make the ratio of the COD mass concentration to the sulfate radical mass concentration in the treated water sample about 2:1, the waste water enters the hydrolytic acidification tank equipped wi...

Embodiment 3

[0072] Taking the lead-zinc beneficiation wastewater discharged from a factory as the treatment object, it is obtained through testing that the COD in the wastewater is 1960mg / L, and the sulfate radical is 1100mg / L, which meets the condition that the ratio of the mass concentration of COD to the mass concentration of sulfate radical is N, so the treatment For this water sample, the hydrolysis and acidification step was omitted.

[0073] Specifically, the biological treatment method for removing sulfate radicals and COD in the lead-zinc mineral processing wastewater in the present embodiment comprises the following steps:

[0074] Step 1, monitoring and judging the mass concentration ratio of COD and sulfate in the lead-zinc mineral processing wastewater, that is, obtaining the above water quality detection and judging steps, which will not be repeated here.

[0075] Step 3: Add lime water to the water inlet tank containing the lead-zinc mineral processing wastewater in step 1 ...

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Abstract

The invention belongs to the technical field of environment-friendly pollutant treatment methods, and particularly relates to a biological treatment method for removing sulfate radicals and COD (Chemical Oxygen Demand) in lead and zinc beneficiation wastewater. The method comprises the following steps: detecting and judging the mass concentration ratio of COD to sulfate radicals in the lead-zinc beneficiation wastewater, if the mass concentration ratio is less than N, firstly carrying out hydrolytic acidification treatment, and then adding alkali liquor to adjust the pH value of the wastewater; if mass concentration ratio is equal to N, directly adding alkali liquor to adjust the pH value of the wastewater; carrying out anaerobic treatment to reduce sulfate radicals in the wastewater into hydrogen sulfide; carrying out hydrogen sulfide stripping treatment to remove hydrogen sulfide in the wastewater; carrying out aerobic treatment to remove COD in the wastewater; and carrying out solid-liquid separation on the wastewater to obtain a water body meeting the sewage discharge standard. The biological treatment method disclosed by the invention can be used for greatly reducing substances such as sulfate radicals and organic pollutants in the wastewater, so that the effluent reaches the national discharge standard. The method is low in energy consumption, less in residual sludge, resistant to impact load, convenient to operate and manage, high in treatment efficiency, low in operating cost, environment-friendly and efficient.

Description

technical field [0001] The invention belongs to environmental protection pollutant treatment technology, in particular to a biological treatment method for removing sulfate and COD in lead-zinc ore dressing wastewater. Background technique [0002] The beneficiation process of lead-zinc ore requires a large amount of water, and most of the waste water will be discharged outside the recycled water. Due to the addition of beneficiation agents during the beneficiation process, the beneficiation agents contain a large amount of sulfate, and some of the beneficiation agents will remain in the wastewater, so the discharged wastewater contains a large amount of sulfate radicals and heavy metals, which are harmful to the aquatic ecosystem and the human body. It is very harmful. After being discharged into the water body, there are many toxic substances and the water quality changes greatly, resulting in the destruction of the ecosystem and a huge impact on the environment. At the sa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C02F101/10C02F101/30C02F103/10
CPCC02F9/00C02F2101/101C02F2209/08C02F2103/10C02F2305/06C02F3/28C02F1/66C02F2209/06C02F3/2813C02F2101/30C02F3/2806C02F3/2846C02F2209/10C02F2209/22C02F3/32C02F2209/05C02F1/52C02F2001/007C02F2209/44Y02E50/30
Inventor 狄国勋文剑陈伟军黄娅朱兴华李佳怡
Owner 广东中金岭南环保工程有限公司
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