A control method for crystallization and phosphorus removal of dairy waste water

A technology for removing phosphorus from dairy wastewater and crystallization, which is used in water treatment parameter control, food industry wastewater treatment, chemical instruments and methods, etc., can solve the problems of large fluctuations in COD concentration and pH value, and achieve sustainable recycling , the effect of reducing phosphorus load

Active Publication Date: 2019-08-02
盐城龙湖污水处理有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the cyclical changes in the dairy product processing process, the COD concentration and pH value of the wastewater discharged at different times fluctuate greatly

Method used

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  • A control method for crystallization and phosphorus removal of dairy waste water
  • A control method for crystallization and phosphorus removal of dairy waste water
  • A control method for crystallization and phosphorus removal of dairy waste water

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Step 1 Take the wastewater (raw water) before the anaerobic tank in the dairy wastewater treatment process; Step 2 Raw water is filtered through a 3-5mm fine grid impurity; Step 3 Then add bone carbon to the filtered dairy wastewater, throw Dosing ratio n(Ca):n(P)=3.0:1, stirring intensity 180r / min, stirring time 60min, pH during the reaction is 7.8, temperature is 25°C; after the reaction in step 4, let stand for 1h, Separate the supernatant; filter through a 0.45 μm microporous membrane in step 5; discharge the filtrate in step 6; place the crystalline precipitated product in step 7 to dry in an oven at 35° C. for 48 hours, and recover the crystalline precipitate. The composition of the composite crystal nucleus agent is composed of bone carbon, tobermorite and diatomaceous earth in a mass ratio of 3:2:1.

Embodiment 2

[0033] Step 1 Take the wastewater (raw water) before the anaerobic tank in the dairy wastewater treatment process; Step 2 Raw water is filtered through a 3-5mm fine grid impurity; Step 3 Then add bone carbon to the filtered dairy wastewater, throw Dosing ratio n(Ca):n(P)=3.3:1, stirring intensity 200r / min, stirring time 60min, adjust the pH value during the reverse process to 8.3, and control the temperature at 26°C; Set aside for 1 hour to separate the supernatant; filter through a 0.45 μm microporous membrane in step 5; discharge the filtrate in step 6; place the crystalline precipitated product in step 7 in an oven at 38° C. for 48 hours to recover the crystalline precipitate. The composition of the composite crystal nucleus agent is composed of bone carbon, tobermorite and diatomaceous earth in a mass ratio of 3:2:1.

Embodiment 3

[0035] Step 1 Take the wastewater (raw water) before the anaerobic tank in the dairy wastewater treatment process; Step 2 Raw water is filtered through a 3-5mm fine grid impurity; Step 3 Then add bone carbon to the filtered dairy wastewater, throw Dosing ratio n(Ca):n(P)=3.5:1, stirring intensity 210r / min, stirring time 60min, adjust the pH value during the reverse process to 8.8, and control the temperature at 28°C; Set aside for 1.5 hours, and separate the supernatant; step 5, filter through a 0.45 μm microporous membrane; step 6, discharge the filtrate; step 7, place the crystalline precipitated product in an oven at 40° C. to dry for 50 hours, and recover the crystalline precipitate. The composition of the composite crystal nucleus agent is composed of bone carbon, tobermorite and diatomaceous earth in a mass ratio of 3:2:1.

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Abstract

The invention relates to a phosphorus removal control method for dairy product wastewater through crystallization and belongs to the technical field of biological treatment for wastewater. The method comprises steps as follows: raw water passes through a fine screen of 3-5 mm for impurity filtration; in the reaction process, a compound crystal nucleus agent is added to the filter dairy product wastewater, the adding ratio n(Ca):n(P) is (3-3.5):1 in molar ratio, the stirring intensity is 180-210 r / min, and the stirring time is 50-70 min; the product is left to stand for 1-1..5 h after the reaction; a reaction liquid is filtered by a microporous filter membrane of 0.45 mu m; filtrate is removed and a crystalized precipitate is recycled; the crystalized precipitate is placed in an oven at 35-40 DEG C to be dried for 48-50 h and recycled. Phosphorus-containing wastewater in low and medium concentration is treated with the phosphorus removal technology, the phosphorus load in the follow-up biological treatment technology is effectively reduced, and sustainable recycling of resources is realized.

Description

technical field [0001] The invention relates to the technical field of sewage biological treatment, in particular to a control method for crystallization and phosphorus removal of dairy waste water. Background technique [0002] The dairy industry is a booming industry that has emerged in recent years, especially in recent years, it has shown a linear development trend. According to relevant statistics in 2000, there are more than 1,500 enterprises producing and processing dairy products in my country, of which 359 have annual sales of more than 5 million yuan, and 12 have annual sales of over 100 million yuan. The types of dairy products include liquid milk, and its output can reach 8 million tons. [0003] With the growth of my country's national economy, people's requirements for quality of life are getting higher and higher, and the demand for dairy products is also increasing. This demand has driven the rapid development of the dairy industry. While meeting the needs ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/04C02F103/32
CPCC02F1/001C02F1/44C02F1/58C02F1/66C02F9/00C02F2103/327C02F2209/02C02F2209/06
Inventor 叶友林周鹏徐启程于洋
Owner 盐城龙湖污水处理有限公司
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