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Pretreatment of industrial wastewater with high concentration and of difficult degradation

An industrial wastewater, refractory technology, applied in water/sewage treatment, flotation water/sewage treatment, light water/sewage treatment, etc., can solve the problems of poor mixed wastewater effect and unsatisfactory effect.

Inactive Publication Date: 2005-10-12
陈平
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  • Summary
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  • Application Information

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Problems solved by technology

Existing treatment methods such as chemical method, physical method, biological method, incineration method, etc. Experiments have proved that, except for incineration method, the effect of pretreatment by other methods is not ideal, especially for the mixed wastewater after collection.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0019] Taking the high concentration, refractory industrial wastewater initial pH value as an example, the non-limiting examples are described as follows:

[0020] 1. Put the waste water into the reaction kettle, and measure whether the pH value reaches 2-4. If the pH value is not adjusted to the specified value with dilute acid, add 0.5-1.5% ferrous sulfate and 2-12% oxalic acid under stirring, Or add 5-10% hydrogen peroxide or ozone at the same time, and stir for 1 hour.

[0021] 2. Pump the chemically oxidized waste water into the photolytic oxidation tank, which is equipped with an ultraviolet lamp tube capable of emitting 200-400nm ultraviolet light, and irradiates for more than 2 hours.

[0022] 3. Pump the photolytically oxidized waste water into the micro-electrolysis tower. The tower is equipped with a catalyst mixed with cast iron chips and coke at a ratio of 1:1. The waste water circulates in the tower and fully contacts for 1 hour.

[0023] 4. Pump the waste water...

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Abstract

A pretreatment method for hardly degradable high-concentration industrial waste water consists of pH value regulation, oxidization, coagulation and separation. It is characterized by combining each of treatment to form integrated pretreatment according to the order of regulating waste water pH value. It is carried out by chemical oxidizing, photolytic oxidizing and microelectrolytic decomposing at pH 2-4, air float separating tailing at pH 6-7, and coagulating separating settling at pH 8-9. The treatment of every unit is combined by initial pH value of waste water. It achieves higher biological degradability.

Description

1. Technical field [0001] The invention relates to a treatment method for industrial waste water, in particular to a pretreatment method for high-concentration and refractory industrial waste water. 2. Background technology [0002] Chemical industry, pesticide, medicine, printing and dyeing, food and other industries all discharge high-concentration industrial wastewater in the production process. The organic matter contained in these wastewater is various, some are toxic, and the concentration is high. The COD value of wastewater is low. Tens of thousands, tens of thousands, hundreds of thousands, the biodegradability is very poor. [0003] At present, many cities, especially industrial parks, have built sewage treatment stations for uniform biochemical treatment of wastewater, but the COD of wastewater entering the device is required to be below 500mg / L, which requires pretreatment of the above wastewater. [0004] The above-mentioned types of high-concentration, refract...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/24C02F1/32C02F1/52C02F1/66C02F1/72C02F9/02C02F9/06
Inventor 陈平陈耀庭
Owner 陈平
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