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Biochemical treatment method and apparatus for high calcium and high magnesium waste water

A biochemical treatment device and biochemical treatment technology, applied in multi-stage water treatment, water/sewage treatment, anaerobic digestion treatment, etc., can solve problems such as secondary pollution of solid waste, reduce calcium hardness, have a wide range of applications, and process Effects with low requirements

Pending Publication Date: 2016-10-12
桂琪
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Ion exchange and membrane separation methods are only suitable for the removal of low-concentration calcium ions. Precipitation methods are likely to cause secondary pollution of solid waste due to the generation of large amounts of sediment.

Method used

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  • Biochemical treatment method and apparatus for high calcium and high magnesium waste water
  • Biochemical treatment method and apparatus for high calcium and high magnesium waste water
  • Biochemical treatment method and apparatus for high calcium and high magnesium waste water

Examples

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Effect test

Embodiment 1

[0039] A biochemical treatment method for high-calcium and high-magnesium wastewater, comprising the following steps:

[0040] S1. Wastewater pretreatment: The wastewater containing calcium ions and COD ≥ 300mg / L, in which the concentration of calcium ions ≤ 10000mg / L, is filtered through fine grids and flocculant PAC is added to the sedimentation tank to carry out precipitation to remove high Most of the suspended solids in the calcium wastewater, so that the concentration of suspended solids is below 300mg / L; then maintain the pH value of the wastewater at 6.2-6.3; when the fine grid is filtered, the flow rate of the wastewater through the grid is 0.5m / s;

[0041] S2. Biological decalcification anaerobic treatment: the pretreated wastewater enters the biological decalcification and magnesium removal anaerobic reaction tank, and under the action of anaerobic microorganisms in the anaerobic sludge, the biological decalcification hydrolysis acidification reaction is carried out;...

Embodiment 2

[0045] A biochemical treatment method for high-calcium and high-magnesium wastewater, comprising the following steps:

[0046] S1. Wastewater pretreatment: The wastewater containing magnesium ions and COD ≥ 300mg / L, in which the concentration of magnesium ions ≤ 10000mg / L, is filtered through fine grids and flocculant PAM is added to the sedimentation tank to carry out precipitation to remove high Most of the suspended solids in calcium and high magnesium wastewater make the concentration of suspended solids below 300mg / L; then maintain the pH value of the wastewater at 6.9-7; the flow rate of wastewater passing through the grid is 1.0m / s during fine grid filtration;

[0047] S2. Biological magnesium removal anaerobic treatment: the pretreated wastewater enters the biological decalcification and magnesium removal anaerobic reaction tank, and under the action of anaerobic microorganisms in the anaerobic sludge, the biological magnesium removal hydrolysis acidification reaction i...

Embodiment 3

[0051] A biochemical treatment method for high-calcium and high-magnesium wastewater, comprising the following steps:

[0052] S1. Wastewater pretreatment: Wastewater containing calcium ions and magnesium ions, and COD ≥ 300mg / L, wherein the concentration of calcium ions ≤ 10000mg / L, the concentration of magnesium ions ≤ 10000mg / L, is filtered through a fine grid and placed in a sedimentation tank Add flocculants PAM and PAC to the water to remove most of the suspended solids in the high-calcium and high-magnesium wastewater by precipitation, so that the suspended solids concentration is below 300mg / L; then maintain the pH value of the wastewater at 6.5-6.8; fine grid filtration The flow velocity of waste water through the gate is 0.8m / s;

[0053] S2. Biological decalcification and magnesium removal anaerobic treatment: The pretreated wastewater enters the biological decalcification and magnesium removal anaerobic reaction tank, and under the action of anaerobic microorganisms...

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Abstract

The invention discloses a biochemical treatment method for high calcium and high magnesium waste water. The biochemical treatment method comprises the following steps: S1) waste water pretreatment, S2) biological calcium-removal magnesium-removal anaerobic reaction, S3) pH value adjusting and biochemical calcification, magnesiation treatment, and S4) deposition and discharge of calcification and magnesiation sludge. The invention also discloses an apparatus for high calcium and high magnesium waste water. The biochemical treatment method can reduce the calcium ions and magnesium ions content in the waste water with high efficiency as well as reduce the calcium hardness in the waste water; simultaneously can reduce partial COD, increases B / C ratio, and increases the biodegradability of the waste water; avoids generation of calcium deposition phenomenon during a waste water treatment process, prevents corrosion and obstruction of pipeline equipment, and reduces influence of the calcium ions and the magnesium ions to activated sludge performance and nitrogen removal function of a biological treatment A / O system. The method has the advantages of simple process, easy operation, low requirements of technology condition, and easy control. The apparatus has the advantages of high system stability, simple structural setting, and wide application scope.

Description

technical field [0001] The invention relates to a biochemical treatment method and device for high-calcium and high-magnesium waste water, belonging to the technical field of waste water treatment. Background technique [0002] High calcium and high magnesium wastewater refers to the high content of calcium ions and magnesium ions in wastewater, and calcium ions and magnesium ions in wastewater will cause calcium deposition or magnesium deposition in the biochemical treatment system in sewage treatment, resulting in activated sludge. Inorganic components increased, resulting in deterioration of sludge performance. In addition, calcium ions have a strong inhibitory effect on nitrifying bacteria, which seriously affects the denitrification function of the biological treatment A / O system. At the same time, the deposition of calcium salts and magnesium salts on the surfaces of pipes and equipment in the biochemical calcification tank will accelerate the corrosion of pipeline eq...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C02F101/20
CPCC02F9/00C02F1/00C02F1/66C02F1/52C02F2301/08C02F3/28C02F2101/20
Inventor 桂琪邹森林黄睦凯
Owner 桂琪
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