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Anaerobic-aerobic combined biological treatment method for oily wastewater of cold rolling mill

A biological treatment and anaerobic treatment technology, applied in metallurgical wastewater treatment, aerobic and anaerobic process treatment, water/sewage multi-stage treatment, etc. The effect of simple operation, low processing cost and low equipment investment

Inactive Publication Date: 2011-04-27
武钢集团有限公司 +1
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  • Claims
  • Application Information

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Problems solved by technology

Biological treatment technology is partially applied in the above-mentioned patented methods, but the method of chemical oxidation is also adopted in the above-mentioned two processes. The content of COD (chemical oxygen demand) is high, and the biochemical properties are not good after conventional anaerobic digestion treatment. The oil and COD in the oily wastewater after this step cannot meet the water requirements of the subsequent process, so chemical oxidation must be carried out by chemical reagents. Make the indicators drop to a lower level before subsequent processing
Although the chemical oxidation in the process method has a good oxidation effect, there are also the following problems: (1) There are many related equipments involved in the chemical reaction in the chemical oxidation, the process is complicated, the equipment operation is cumbersome, and the investment cost is high; The high cost of chemical oxidation reagents such as the commonly used Fenton reagent greatly increases the operating cost, and the cost of treating oily wastewater per ton is more than 30 yuan / ton
Based on the above reasons, this kind of process method has been stuck in the laboratory stage, and it is difficult to popularize and apply.

Method used

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  • Anaerobic-aerobic combined biological treatment method for oily wastewater of cold rolling mill

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Embodiment Construction

[0022] After the oily wastewater from the cold rolling steel mill is treated at the first stage, the indicators in the oily wastewater are: SS less than 300mg / L, oil less than 30mg / L, COD Cr Less than 4000mg / L.

[0023] (1) Pre-treatment: Send the oily wastewater after the primary treatment to the regulating tank 1, add biological nutrients urea and ammonium dihydrogen phosphate, so that the nutrient ratio meets COD Cr :N:P=200-300:5:1, NH 3 -N<1000mg / L, at the same time add the following trace elements in proportion, Fe=0.5-1.5mg / L, Co=0.03-0.07mg / L, Ni=0.02-0.04mg / L;

[0024](2) Anaerobic treatment: the pre-treated oily wastewater enters the cooling tower 2 through the pump 5 and is cooled to 35°C-38°C, and then sent to the anaerobic reactor (UASB) 3 through the pump 5, and then adjusted with sodium hydroxide The pH is 6.5-7.8, the alkalinity is controlled at 1000-5000mg / L, the concentration of VFA is less than 3mmol / L, the suspended matter is controlled below 300mg / L, and...

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Abstract

The invention discloses an anaerobic-aerobic combined biological processing method of waste water containing oil of a cold rolling mill, which solves the problems of complexity, high equipment invest, high running cost and unstable outlet water quality of the prior technology for processing waste water containing oil. Anaerobic processing and aerobic processing are orderly carried out to the waste water containing oil, and the parameter of every item is strictly controlled to enable the oil and COD concentrations of the waste water containing oil of cold rolling after second-stage processing to reach the first-grade discharge standard of integrated waste water discharge standards GB8978-1996. The invention has simple and convenient operation, stable running, good biochemical performance and low running cost.

Description

technical field [0001] The invention relates to a treatment method for industrial waste water, in particular to a secondary treatment method for oily waste water in a cold-rolling steel mill in the metallurgical industry. Background technique [0002] Oily wastewater from cold rolling mills (hereinafter referred to as oily wastewater) is one of the most difficult wastewater in the steel industry. The waste water mainly comes from the rolling mill unit, the roller shop, the strip degreasing unit, the skin pass unit and the drainage of oil depots of each unit. According to the shape and separation characteristics of oil, oily wastewater can be divided into floating oil, dispersed oil, emulsified oil, dissolved oil and oil-solid matter. The form of oil in oily wastewater is mainly emulsified. Emulsified oil is milky in sewage, and the particle size of oil droplets is generally 0.1-25 μm. The surface of the oil droplets is covered with a layer of negatively charged hydration ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/14C02F3/30C02F103/16
Inventor 吴高明舒纯王增玉黄祁何晶王剑张平吴启兵任大军
Owner 武钢集团有限公司
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