Device and process for preparing macromolecular aluminum salt coagulant by utilizing sludge of high-salinity wastewater zero discharge system

A high-salt wastewater and zero-discharge technology, which is applied in water/sludge/sewage treatment, water pollutants, water/sewage treatment, etc. Complex process and other issues, to achieve the effect of alleviating the pressure of sludge treatment and disposal, significant economic and environmental benefits, and simple operation

Pending Publication Date: 2021-05-07
SHANGHAI UNIVERSITY OF ELECTRIC POWER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are mainly two deficiencies in this preparation method. One is that there are too many types of raw materials for use, and the Al in bauxite 2 o 3 The mass fraction requirement is not less than 50%, and the mass fraction of CaO in high calcium stone is not less than 80%. The selection of raw materials is too harsh, and the production method is not universal; the second is that the production process is too complicated and needs to be pelletized and High-energy production steps such as rotary furnace calcination convert the aluminum source into calcium aluminate, which is easily reactive with acid, and the excessive amount of hydrochloric acid is not suitable for large-scale production of PAC
[0007] Therefore, in view of the outlet problem of a large amount of solid waste produced by the existing high-salt wastewater zero-discharge process, the present invention proposes a technical route for preparing high-molecular aluminum salt coagulant from the high-salt wastewater dechlorination precipitate. Compensate the operating cost of the zero-emission system while abolishing the outlet

Method used

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  • Device and process for preparing macromolecular aluminum salt coagulant by utilizing sludge of high-salinity wastewater zero discharge system
  • Device and process for preparing macromolecular aluminum salt coagulant by utilizing sludge of high-salinity wastewater zero discharge system
  • Device and process for preparing macromolecular aluminum salt coagulant by utilizing sludge of high-salinity wastewater zero discharge system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0101] A process for preparing aluminum salt coagulant by recovering solid waste from high-salt wastewater with zero discharge, the process flow is as attached figure 1 As shown, it includes the zero-discharge process module of high-salt wastewater and the process module of solid waste recovery and preparation of aluminum salt coagulant.

[0102] The high-salt wastewater zero-discharge process module includes a high-salt wastewater inlet pump 22, a pre-sedimentation tank 1, a first sedimentation tank 2, a magnesium and sulfur removal tank 3, a second sedimentation tank 4, a chlorine removal reaction tank 5, and a chlorine removal tank. Settling tank 6, the third settling tank 7. The pre-sedimentation tank 1 is also connected with the calcium oxide dosing device 15, the magnesium and sulfur removal tank 3 is also connected with the magnesium and sulfur removal agent dosing device 16, and the chlorine removal reaction tank is also connected with the calcium oxide dosing device 1...

Embodiment 2

[0112] For a power plant flue gas desulfurization wastewater Ca 2+ , Mg 2+ , SO 4 2- and Cl - Concentrations are 1500, 1000, 3000 and 5000mg / L respectively, after treatment, Ca 2+ 2+ 4 2- - <2500mg / L, the indicators of PAC prepared by the production of chlorine-removing sediment must meet the requirements of the national standard GB / T22627-2014 for water treatment agents.

[0113] Based on the process in Example 1, a treatment water volume of 0.5m 3 / h productive demonstrative project, to process and productively demonstrate the actual flue gas desulfurization wastewater of a power plant. The operation of the process is divided into three stages, which run continuously for 16 days. The first stage is engineering commissioning, the second stage is to treat the raw water of desulfurization wastewater (2~12d), and the third stage is to treat the desulfurization wastewater of the power plant. (13~16d).

[0114] Such as image 3 and Figure 4 As shown, the concentration o...

Embodiment 3

[0135] A waste incineration power plant Ca 2+ , Mg 2+ , SO 4 2- , Cl - Concentrations of 2.4mg / L, 0.48mg / L, 1717.9mg / L, 5225.6mg / L of smoke washing wastewater, control Cl after treatment - Below 2600mg / L, the PAS produced by the recycling process of the compound salt precipitate formed by the removal of chloride ions must meet the national standard "Water Treatment Agent Polyaluminum Sulfate" (HG / T5006-2016).

[0136] This embodiment is substantially the same as Embodiment 2, but due to the low concentration of suspended solids and calcium and magnesium ions in the tobacco washing wastewater, the wastewater is directly discharged into the magnesium and sulfur removal pool 3 through the high-salt wastewater inlet pump 22 .

[0137] The sulfur removal agent used in the magnesium and sulfur removal tank 3 is calcium oxide, and the dosage is controlled at 3-6kg / m 3 . After the effluent is separated by the second sedimentation tank 4, the supernatant enters the chlorine remov...

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Abstract

The invention relates to a device and a process for preparing a high-molecular aluminum salt coagulant by using sludge of a high-salinity wastewater zero discharge system. Impurities in wastewater are removed in advance through optimal design of a process flow, and the content of Al2O3 in dechlorination precipitates is increased; and the dechlorination precipitate is used as a raw material to prepare a polymer aluminum salt coagulant such as PAC or polyaluminum sulfate (PAS), so that the problem of solid waste discharge is solved, and the running cost of a zero emission system is compensated at the same time. The indexes such as the mass fraction, the basicity and the heavy metal content of the prepared PAC or PAS aluminum oxide respectively meet the requirements of water treatment agent national standards of water treatment agent polyaluminum chloride (GB / T22627-2014) and water treatment agent polyaluminum sulfate (HG / T5006-2016), and the concept of solid waste recycling can be realized.

Description

technical field [0001] The invention belongs to the technical field of solid waste resource treatment, and relates to a device and a process for preparing a high-molecular aluminum salt coagulant from the sludge of a high-salt wastewater zero-discharge system. Background technique [0002] In recent years, high-salt wastewater has attracted much attention due to its large production volume, strong corrosiveness, and serious environmental pollution. As early as 2000, the European Union promulgated a social pact to prevent water bodies from being polluted by high-salt wastewater. In response to this problem, Beijing, Shanghai, Henan, Hebei, Guizhou, Sichuan and other provinces have successively promulgated local standards to limit the discharge concentration of wastewater salt. At present, with the improvement of discharge requirements for industrial production in my country, the chemical industry is in an important stage of transformation and upgrading. Coal chemical industr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F1/52C01F7/56C01F7/74C02F101/10C02F101/12
CPCC01F7/56C01F7/74C02F1/5236C02F1/58C02F1/66C02F9/00C02F2001/007C02F2101/101C02F2101/12C02F2301/04
Inventor 周振郭家明明强赵琦琦孙荣山郗家福余司颀曾丽赵晓丹夏庆
Owner SHANGHAI UNIVERSITY OF ELECTRIC POWER
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