Treatment method and device for silicon containing wastewater

A waste water treatment, waste water technology, applied in the direction of water/sewage multi-stage treatment, water/sludge/sewage treatment, chemical instruments and methods, etc., can solve the problem of poor silicon removal effect of waste water, unstable effluent quality, and removal rate of dissolved silicon Low-level problems, to achieve the effect of convenient source of chemicals, good application prospects, and improved silicon removal effect

Active Publication Date: 2016-07-27
GO HIGHER ENVIRONMENT GRP CO LTD
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Problems solved by technology

[0005] The present invention proposes a method and device for treating silicon-containing wastewater, which solves the problem of low removal rate of dissolved silicon in the existing coagulatio

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  • Treatment method and device for silicon containing wastewater
  • Treatment method and device for silicon containing wastewater
  • Treatment method and device for silicon containing wastewater

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Embodiment 1-4

[0063] The wastewater from a catalyst factory of a petrochemical enterprise is treated by using the method and device for treating silicon-containing wastewater of the present invention, and the specific method steps are as follows.

[0064] After the wastewater was preliminarily precipitated, the process of coagulation and silicon removal was carried out in the coagulation sedimentation tank, wherein all the agents were formulated into solutions, and the dosages are shown in Table 1. First add lime and PAC to the primary coagulation tank, stir for 20 minutes to mix well, then add magnesium sulfate and PAM to the secondary coagulation tank, stir for 30 minutes to form alum flower settlement, after 2 hours of precipitation, the muddy water Separation yielded a clear supernatant. After testing, the effluent after the treatment of each example was analyzed for SiO 2 content, after calculation, the silicon removal rate of each embodiment is shown in Table 1.

[0065] Table 1

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Abstract

The invention provides a treatment method and device for silicon containing wastewater to stably and effectively remove colloidal silicon and dissolved silicon from wastewater. The method mainly consists of the steps of: preliminary sedimentation for recovery part of silicon dioxide, first stage coagulation, adding of a coagulant to remove dissolved silicon and colloidal silicon in the wastewater; and second stage coagulation, adding of a coagulant aid and a magnesium salt to accelerate sediment growth with the precipitated sediment (sludge) as a contact medium; second stage sedimentation for solid-liquid separation and sedimentation of coagulated flocs. Through the synergistic effect of medicaments, the method and the device can achieve a best silicon removal effect, solve the problems of difficult settlement of SiO2 gel and high residual turbidity, the overall process has the characteristics of complete silicon removal, maturity, rational design, simple operation, low cost, and strong impact load endurance, the method and the device can effectively remove colloidal silicon and dissolved silicon from wastewater, and have good application prospects.

Description

technical field [0001] The invention relates to the field of wastewater treatment, in particular to a method and device for treating silicon-containing wastewater. Background technique [0002] At present, in the catalyst production process of the petrochemical industry, a large amount of silicon-containing wastewater is produced in the molecular sieve workshop, and the silicate contained in it is represented by SiO 2 It can reach 2.0%-4.0%, and it is quite stable. The silicon in the wastewater discharged from the production of catalysts is brought in by the raw material water glass, and the new ecological SiO in the reaction process 2 Initially in a crystalline state, a true solution is formed, but dissolved SiO 2 Has great polymerization ability and can gradually combine together to form a typical negatively charged SiO 2 colloidal solution. Colloidal silicon and dissolved silicon in water can be converted to each other. These wastewaters are generally alkaline and hav...

Claims

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Application Information

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IPC IPC(8): C02F9/04C02F101/10
Inventor 陈福泰
Owner GO HIGHER ENVIRONMENT GRP CO LTD
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