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Physicochemical-biological combined treating method for high-concentration organic pyrosulfite wastewater

A pyrosulfite and organic wastewater technology, which is applied in food industry wastewater treatment, chemical instruments and methods, water/sewage multi-stage treatment, etc., can solve the system's accompanying scaling and blockage, low air utilization rate, low rate, etc. problem, to achieve the effect of improving biodegradability and good effect

Inactive Publication Date: 2017-06-20
CENT SOUTH UNIV
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Problems solved by technology

However, due to the low rate of the reaction, the utilization rate of the incoming air is low, a large amount of oxygen is wasted, the efficiency of the equipment is also low, and the system is often accompanied by fouling and clogging, and the investment and operating costs are correspondingly increased.

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  • Physicochemical-biological combined treating method for high-concentration organic pyrosulfite wastewater

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[0021] Implementation method: such as figure 1 Shown, the physicochemical-biological joint treatment method of high-concentration pyrosulfite organic wastewater, its method step is as follows;

[0022] 1) Fenton oxidation: Add 30% hydrogen peroxide and FeSO to high-concentration pyrosulfite organic wastewater 4 ·7H 2 O, n(H 2 o 2 ): n(Fe 2+ )=5.5:1, stir for 2 hours to make it fully react; after the reaction is complete, take a water sample to detect its COD Cr and sulfite content;

[0023] 2) Quicklime neutralization: the wastewater oxidized by Fenton flows into the neutralization tank, and 10kg of quicklime is added to 1t of wastewater, and stirred to make it fully react;

[0024] 3) Inclined plate sedimentation: The neutralized wastewater flows to the inclined plate sedimentation tank by itself, and the inclined plate sedimentation can greatly accelerate the CaSO 4 And the excess quicklime settling speed, the inorganic salt content in the wastewater is significantly ...

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Abstract

The invention discloses a physicochemical-biological combined treating method for high-concentration organic pyrosulfite wastewater. The method comprises the following six steps: 1) Fenton oxidation; 2) neutralization with quicklime; 3) inclined-plate precipitation; 4) chemical flocculation; 5) filtering with quartz sand; and 6) biologically reinforced treatment with pyrosulfite-tolerant engineering bacteria. According to the invention, weak acidity of the organic pyrosulfite wastewater is made full use of, the strong oxidation effect of a Fenton reagent under the condition of weak acidity is given to play so as to oxidize pyrosulfite with toxicity into nontoxic sulfate, and macro-molecular organic matters in the wastewater can be degraded small molecules, so biodegradability of the wastewater is improved; and the domesticated engineering bacteria with salinity tolerance of 50 g / L are used as bacteria in a biologically reinforced treatment phase for three-stage biologically reinforced treatment so as to microfloras adaptive to environment, so degradation of the wastewater is efficiently realized under cooperation of the microfloras and effluent totally meets primary standards prescribed in Comprehensive Wastewater Discharge Standard in China.

Description

technical field [0001] The invention relates to the field of waste water treatment, in particular to a combined physicochemical-biological treatment method for high-concentration pyrosulfite organic waste water. Background technique [0002] Currently, sodium metabisulfite (Na 2 S 2 o 5 ) as a food additive has multiple functions such as bleaching, antisepsis, decolorization and anti-oxidation. In the food processing industry, in order to achieve the purposes of bleaching, sterilization, color enhancement, and freshness preservation, it is artificially added through fumigation, soaking, and direct addition. Especially driven by economic interests, unscrupulous traders often add pyrosulfite in excess to make the product have a better appearance and a longer storage period, but long-term consumption of foods with excessive sulfite will cause serious harm to human health. This type of food processing wastewater not only contains a high concentration of pyrosulfite, but also...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C02F103/32C02F101/10C02F101/30
Inventor 曾伟民王亚萍石丽娟陈雷喻子凌陈桢李振桦余润兰李交昆申丽
Owner CENT SOUTH UNIV
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