Recycling treatment process for thermal power plant desulfurization wastewater
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A technology for thermal power plants and desulfurization wastewater, which is applied in gaseous effluent wastewater treatment, multi-stage water treatment, water/sewage treatment, etc. It can solve the problem of difficulty in ensuring the purity of crystalline salt, high dosing cost, steam consumption and electricity consumption. higher question
Inactive Publication Date: 2017-11-03
上拓环境科技(长兴)有限公司
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The above four desulfurization wastewater treatment process routes have their own advantages and disadvantages, but they all have the following problems: 1) The cost of softening and dosing of pretreatment chemicals is high. According to calculations, the cost of softening chemicals per ton of water is about 20-30 yuan/m3; 2) It...
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Embodiment 1
[0054] A resource treatment process for desulfurization wastewater from a thermal power plant comprises the following steps:
[0055] 1) The desulfurization wastewater is treated by the triple box process, and then enters the pre-sedimentation tank for treatment to obtain the sediment at the bottom and the supernatant at the upper part. The bottom of the pre-settling tank is conical for sludge discharge, and the upper part is equipped with an overflow mouth, the pre-sedimentation tank is used to remove the suspended CaSO in the desulfurization wastewater 4 Removal by gravity sedimentation;
[0056] 2), the supernatant obtained in the pre-sedimentation tank in step 1) overflows to the 1# reaction tank after adding NaOH, and the supernatant fully reacts with NaOH in the 1# reaction tank;
[0057] 3), in step 2), the effluent from the 1# reaction tank enters the concentration tank, and the feed liquid in the concentration tank is transported into the TMF system through a large-f...
Embodiment 2
[0062] like figure 1 As shown, a resource treatment system for desulfurization wastewater from a thermal power plant is characterized in that it includes:
[0063] The pre-sedimentation tank is used to treat the desulfurization wastewater after the three-box process. The bottom of the pre-settling tank is conical for sludge discharge, and the upper part is provided with an overflow port. Suspended CaSO 4Remove by gravity sedimentation to obtain the bottom sediment and the upper supernatant;
[0064] 1# reaction tank, the supernatant overflowed from the pre-sedimentation tank enters the 1# reaction tank through the pipeline, and fully reacts with NaOH in the 1# reaction tank;
[0065] Concentration tank, the effluent of 1# reaction tank enters the concentration tank for concentration to obtain Mg(OH) 2 And feed liquid, Mg(OH) 2 Concentration increases continuously, and after reaching a certain concentration, it is discharged to 2# reaction pool;
[0066] In the TMF system,...
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Abstract
The invention discloses a recycling treatment process for thermal power plant desulfurization wastewater. The process includes: 1) subjecting desulfurization wastewater to triple box treatment, and then letting the treated wastewater enter a pre-sedimentation tank; 2) adding NaOH and letting it overflow into a 1# reaction tank to undergo reaction; 3) letting the effluent water of the 1# reaction tank enter a concentration tank, transporting the feed liquid in the concentration tank into a TMF system for filtering, returning the formed Mg(OH)2 to the concentration tank, and discharging Mg(OH)2 into a 2# reaction tank; 4) letting the TMF system produced water enter a seed crystal tank, outputting the waste liquid to a hydrocyclone, and making the clear liquid obtained by the hydrocyclone enter a nanofiltration system; 5) returning the concentrated liquid obtained by the nanofiltration system to the seed crystal tank, making the dialysate enter a reverse osmosis system, and conducting electric treatment on the obtained concentrated liquid; and 6) subjecting the MgCl2 feed liquid formed in the 2# reaction tank to evaporative crystallization to form MgCl2 crystals, and then conducting re-drying to obtain anhydrous MgCl2, and carrying out electrolytic treatment on the anhydrous MgCl2 to obtain elemental Mg and Cl2. The "chemical reaction+TMF system+seed crystal tank+hydrocyclone+nanofiltration system+reverse osmosis system+bipolar membrane" process involved in the invention can reuse 90% or more of water, and can utilize Mg, CaSO4 and NaCl in wastewater.
Description
technical field [0001] The invention relates to the field of desulfurization wastewater treatment in thermal power plants, in particular to a process for resourceful treatment of desulfurization wastewater in thermal power plants. Background technique [0002] At present, among various desulfurization methods in thermal power plants, boiler flue gas wet desulfurization accounts for an increasing proportion due to its high desulfurization efficiency, but the disadvantage of this process is that waste water is generated, and the pH value of waste water is 5-6 At the same time, it contains a large amount of suspended matter (gypsum particles, SO2, hydroxides of Al and iron), fluorides and heavy metal elements such as As, Cd, Cr, Cu, Hg, Ni, Pb, Sb, Se, Sn, Zn, etc. Domestic power plants mostly adopt wet limestone-gypsum treatment process for desulfurization. The flue gas contains a small amount of F-, Cl- and various impurities brought from the raw coal. After entering the des...
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