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Method for wastewater treatment under low temperature

A technology for wastewater treatment and low temperature conditions, which is applied in the fields of water/sewage multi-stage treatment, water/sludge/sewage treatment, flocculation/sedimentation water/sewage treatment, etc. It can solve the problem of poor biochemical treatment effect and low wastewater coagulation treatment efficiency. and other issues, to achieve the effect of reducing pollution, improving bioavailability, and increasing the amount of reduction

Active Publication Date: 2011-11-09
HANGZHOU CHENGJIE ENVIRONMENTAL PROTECTION
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The invention provides a method suitable for wastewater treatment under low temperature conditions to solve the problems of low coagulation treatment efficiency and poor biochemical treatment effect of wastewater under low temperature conditions, greatly improve the biological effectiveness of microorganisms in biochemical treatment, and improve the biochemical process. Reduction of Pollutants

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  • Method for wastewater treatment under low temperature
  • Method for wastewater treatment under low temperature

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Effect test

Embodiment 1

[0016] 1. For low-temperature printing and dyeing wastewater at 0°C, let it stand in the pre-sedimentation tank for 2 hours to allow larger particles to settle.

[0017] 2. Measure and calculate the volume of wastewater.

[0018] 3. Add polyferric chloride flocculant, so that the dosage of polyferric chloride in low-temperature wastewater reaches 20mg / L (calculated based on the content of Fe element).

[0019] 4. Stir rapidly at 200 rpm for 10 minutes.

[0020] 5. Stir slowly at 60 rpm for 20 minutes.

[0021] 6. Stand for 2 hours to make the flocs in the wastewater fully settle.

[0022] 7. Mix the coagulated sewage and domestic sewage at a volume ratio of 1:1 and perform anaerobic

[0023] - Precipitation, separation of mud and water - aerobic - sedimentation - conventional biochemical treatment of effluent.

[0024] Detection method: COD Cr Potassium dichromate method was used for determination (GB / T11914-1989 "Dichromate Method for Determination of Chemical Oxygen Dem...

Embodiment 2

[0028] 1. For low-temperature chemical wastewater at 4°C, let it stand in the pre-sedimentation tank for 1.5 hours to allow larger particles to settle.

[0029] 2. Measure and calculate the volume of wastewater.

[0030] 3. Add polyferric chloride flocculant, so that the dosage of polyferric chloride in low-temperature wastewater reaches 30 mg / L (calculated based on the content of Fe element).

[0031] 4. Stir rapidly at 200 rpm for 15 minutes.

[0032] 5. Stir at a slow speed of 60 rpm for 60 minutes.

[0033] 6. Stand for 3 hours to make the flocs in the wastewater fully settle.

[0034] 7. Mix the coagulated sewage and domestic sewage with a volume ratio of 1:1, and then perform anaerobic-sedimentation separation sludge and water-aerobic-sedimentation-effluent conventional biochemical treatment. Detection method: COD Cr Potassium dichromate method is used for determination (GB / T11914-1989 "Dichromate Method for Determination of Chemical Oxygen Demand in Water Quality");...

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Abstract

The invention discloses a method applicable to treating wastewater at a low temperature, which pre-treats low-temperature wastewater of 0 to 4 DEG C first, and comprises the following steps: introducing the low-temperature wastewater of 0 to 4 DEG C into a preliminary sedimentation tank, and standing for 2 to 2.5 hours; adding a polymerized iron chloride flocculant to the preliminary sedimentation tank so that the dosage of polymerized iron chloride in the low-temperature wastewater is accumulated to reach 20 to 80 milligrams per liter in terms of the content of Fe element; stirring the mixture for 30 to 75 minutes first, and standing to perform sedimentation for 2 to 3 hours; and subjecting water from the preliminary sedimentation tank after the pretreatment to biochemical treatment. Themethod solves the problem that the wastewater treatment effect is poor at a low temperature, greatly improves the biological effectiveness of microorganisms in the biochemical treatment, improves thepollutant reduction in the biochemical process, and reduces the dosage of aluminum salt in the wastewater treatment so as to reduce the pollution to the environment caused by aluminum simultaneously.

Description

(1) Technical field [0001] The invention relates to a method suitable for wastewater treatment under low temperature conditions. (2) Background technology [0002] Temperature is one of the important influencing factors in the water treatment process. In sewage treatment, low temperature inhibits the growth of activated sludge in biochemical reactions, that is, in water supply treatment, low temperature affects flocculation, making it difficult for effluent water quality to meet standards. Because the temperature in winter is generally low, especially in northern my country, the temperature is below 5°C for most of the year. Therefore, affected by the temperature, the effect of wastewater treatment is affected. In the past, the efficiency of the flocculant at low temperature was mainly improved by adding clay, active silicon and organic polymer compounds, but the amount of sludge would increase, and the effect was not obvious. Experimental research shows that when the tem...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/14C02F1/52
Inventor 刘维屏朱显跃童少平于梅张安平
Owner HANGZHOU CHENGJIE ENVIRONMENTAL PROTECTION