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Method for synchronously removing and recovering nitrogen and phosphorus from meat food processing wastewater

A technology for processing wastewater and meat food, which is applied in the fields of food industry wastewater treatment, chemical instruments and methods, water pollutants, etc. Achieve the effect of recycling and efficient removal

Pending Publication Date: 2022-07-29
中欧环保科技南京有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the total phosphorus and total nitrogen in the influent are too high, biochemical nitrogen and phosphorus removal is often difficult to meet the standard. Only phosphorus removal agent is added before (after) biochemical treatment, or ammonia nitrogen removal agent is added after biochemical treatment, resulting in tons The cost of sewage treatment remains high

Method used

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  • Method for synchronously removing and recovering nitrogen and phosphorus from meat food processing wastewater
  • Method for synchronously removing and recovering nitrogen and phosphorus from meat food processing wastewater
  • Method for synchronously removing and recovering nitrogen and phosphorus from meat food processing wastewater

Examples

Experimental program
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Effect test

Embodiment 1

[0041] A method for simultaneous denitrification and dephosphorization of meat food processing wastewater, comprising the following steps:

[0042] 1) Take the wastewater from a beef processing plant, the initial ammonia nitrogen is 189mg / L, and the total phosphorus is 159mg / L, and the wastewater is passed through the grid to remove large solids and fibers;

[0043] 2) After air flotation and flocculation, clear liquid is obtained. Air flotation mainly removes SS and oil impurities, and can also remove some organic matter to ensure the stable operation of subsequent crystallization and precipitation. Mainly add polyaluminum chloride (PAC) through the dosing pump for coagulation, and then add polyacrylamide (PAM) for flocculation. The scum is scraped to the scum tank.

[0044] 3) Control the pH of the clear liquid to be 8, add magnesium chloride MgCl2 6H2O to the clear liquid, use crystallization precipitation, and mix to produce struvite. The dosage of magnesium chloride is ...

Embodiment 2

[0053] 1) Take the wastewater from a beef processing plant, the initial ammonia nitrogen is 189mg / L, and the total phosphorus is 159mg / L, and the wastewater is passed through the grille to remove large solids;

[0054] 2) After air flotation and flocculation, clear liquid is obtained for treatment. Air flotation mainly removes suspended particles and oil impurities, and can also remove some organic substances to ensure the stable operation of subsequent crystallization and precipitation. Mainly add polyaluminum chloride (PAC) through the dosing pump for coagulation, and then add polyacrylamide (PAM) for flocculation. The suspended particles and grease in the wastewater are floated to the air flotation machine through the air pressure and the tiny bubbles generated by the release head. On the surface, use a scraper to scrape the scum to the scum tank.

[0055] 3) Control the pH of the supernatant = 8, add magnesium chloride MgCl to the supernatant 2 ·6H 2 O, with air stirrin...

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Abstract

The invention relates to the fields of sewage treatment and resource recycling, in particular to a method for synchronously removing and recovering nitrogen and phosphorus from meat processing wastewater, which comprises the following steps: 1) enabling the meat processing wastewater to pass through a grid to remove bulk solids or fibers; (2) removing suspended particulate matters after flocculation and air floatation to obtain clear liquid to be treated; (3) adding magnesium salt into the clear liquid, and recovering nitrogen and phosphorus in the wastewater by adopting a crystallization coprecipitation method; and 4) the solid obtained after solid-liquid separation is struvite, and the filtrate can enter a subsequent biochemical treatment system and can also be directly used as a high-quality carbon source of urban sewage or industrial wastewater. According to the invention, nitrogen and phosphorus are synchronously removed by a simple and efficient method, and nitrogen and phosphorus resources in the nitrogen and phosphorus are recovered as high-quality carbon sources or energy consumption and medicament consumption of nitrogen and phosphorus removal in subsequent biochemical treatment are reduced.

Description

technical field [0001] The invention relates to the field of meat food processing sewage treatment and resource recovery and utilization, in particular to a method for synchronously removing and recovering nitrogen and phosphorus from meat food processing wastewater. Background technique [0002] With the improvement of economic level, people's living standards also improve. Global meat production has doubled in the past 30 years, according to a report by the United Nations Food Organization. Various food additives are added during meat food processing: such as starch, salt, monosodium glutamate, water-retaining agent (complex phosphate), various spices, etc. These food additives will enter the sewage with the food processing process. The main pollutants are a large amount of oil, meat protein and various food additives produced in the process of meat thawing, cooking and mixing. These wastewaters contain a lot of suspended solids, high concentrations of COD, ammonia nitro...

Claims

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Application Information

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IPC IPC(8): C02F9/14C01B25/45C02F101/10C02F101/16C02F103/32
CPCC02F9/00C01B25/451C02F2103/32C02F2001/007C02F1/24C02F1/5236C02F1/56C02F1/586C02F2101/16C02F1/00C02F3/00C02F2101/105
Inventor 董永全董宇盛明鑫肖芬
Owner 中欧环保科技南京有限公司