Carbon Steel Slaughter Sewage Treatment Equipment 50T/D Abattoir Wastewater Treatment

Carbon Steel Slaughter Sewage Treatment Equipment 50T/D SQTZ-50

1, Design basis for slaughterhouse sewage treatment equipment
Management Measures for Environmental Protection of Construction Projects (issued by the State Council Environmental Protection Commission, National Planning Commission, and National Economic Commission on March 26, 1986);
Regulations on Environmental Protection Management of Construction Projects (passed at the 10th Executive Meeting of the State Council on November 18, 1998);
The third level standard in GB13457-92 "Emission Standards for Water Pollutants in the Meat Processing Industry"
Code for Design of Outdoor Drainage GB50014-2006;
The relevant data and materials provided by Party A.
2, Other specifications and standards for slaughterhouse sewage treatment equipment:
Code for Design of Outdoor Drainage GB50014-2006;
Code for Structural Design of Water Supply and Drainage Engineering (GBJ69-2002);
Code for Design of Industrial Corrosion Protection GBJ46-82;
Handbook of Industrial Pollutant Generation and Emission Factors;
Urban Regional Environmental Noise Standard GB3096-93;
Code for Design of Power Supply and Distribution Systems (GB50217-94);
Code for Design of Building Water Supply and Drainage GB50015-2003;
Regulations on Selection of Automation Instruments (HG20507-92);
Code for Design of Low Voltage Electrical Installations (GB50054-95);
Design Specification for Pump Stations GB/T50265-97.

3, Design principles for slaughterhouse sewage treatment equipment
Strictly implement national and local environmental, health, and safety regulations, and after treatment, the main water quality indicators meet relevant national standards;
Adhering to a scientific attitude in the design, the water treatment process adopted should not only reflect advanced technology, economic rationality, but also be mature, safe and reliable, and have the characteristics of simple operation and convenient operation and management;
The processing unit is relatively compact and occupies as little land as possible, while ensuring stable operation and meeting the standard of effluent quality, minimizing engineering and operating costs as much as possible;
Adhere to the principle of combining sewage biochemical treatment with ecological treatment in the design, and create a harmonious ecological environment for sewage treatment.
4, Design and treatment scale of slaughterhouse sewage treatment equipment
According to the provided information, the amount of slaughterhouse wastewater is 200m ³/ d. Wastewater is mainly generated from flushing water during pig slaughter, cleaning water for meat and viscera after slaughter, and cleaning water for slaughtering equipment and venues. Concentrated discharge of wastewater during production.
5, Quality of inlet and outlet water from slaughterhouse sewage treatment equipment
Based on the experience in slaughterhouse sewage treatment, the quality of raw sewage before treatment in this project is shown in the table below.

Unit:mg/L

Effluent quality requirements
The effluent quality indicators in this scheme design strictly follow the third level standard in GB13457-92 "Water Pollutant Discharge Standard for Meat Processing Industry".

Unit:mg/L

6, Analysis on the treatment process of slaughterhouse sewage treatment equipment
Slaughtering wastewater contains pollutants such as animal blood, oil, minced meat, food residue, pig hair, feces, and sediment. The characteristics of wastewater can be summarized as follows: (1) significant changes in water quality and quantity (the wastewater from the factory is discharged in a centralized manner); (2) From the quality of the original wastewater, it can be seen that the wastewater has good biodegradability, with a B/C ratio of over 0.4, making it suitable for biological treatment; (3) The suspended solids content in wastewater is very high, with SS ≤ 1500mg/L. In addition to inorganic impurity particles, there are also many organic substances with poor fluidity such as lipids and proteins, which account for about 40% -50% of CODCr. In this project, CODCr ≤ 2000 mg/L, BOD5 ≤ 900mg/L, and animal and vegetable oil ≤ 125mg/L. Based on the water quality, it can be seen that slaughterhouse wastewater has good biodegradability, with turbid water quality, easy to rot and odor, and forms scum, Pre treatment is necessary before biological treatment.
The use of A/O biological treatment process has been the main method used by domestic and foreign environmental protection workers in recent years to solve wastewater denitrification. This method has the following characteristics:
By utilizing the nitrifying bacteria and denitrification bacteria cultivated in the system, the goal of removing carbon containing organic matter and ammonia nitrogen in wastewater is achieved. Compared with adding a denitrification tertiary treatment system after ordinary activated sludge treatment, it has the advantages of low infrastructure investment, low operating costs, low power consumption, and less land occupation.
The A/O biological treatment system produces less excess sludge than general biological treatment systems, and has good sludge settling performance and is easy to dehydrate.
The A/O biological method has higher impact load resistance and stable operation compared to general biological treatment systems.
The A/O biological treatment system converts NO2-N into N2, so there is no accumulation of NO2-N generated during the nitrification process. However, 1mg/NO2-N can cause a COD value of 1.14mg. Therefore, when only nitrifying, although the ammonia nitrogen concentration may meet the standard, the COD concentration often exceeds the standard seriously. Adopting an A/O biological treatment system can not only solve organic pollution, but also solve nitrogen and phosphorus pollution. In summary, through this process flow, all indicators of the effluent can meet the third level standard in the "Water Pollutant Discharge Standard for Meat Processing Industry" GB13457-92.

7, Precautions for slaughterhouse sewage treatment equipment
(1) Animal hair, food residue, broken meat, bone residue, etc. are prone to clogging the pump, which will affect the entire subsequent process treatment. Therefore, mechanical grids are used in the plan to remove the majority of suspended solids, impurities, etc.
(2) The organic matter content is high, and air flotation treatment is used to remove most of the suspended solids and insoluble organic matter, while reducing emulsified oil and improving the impact of oil and fat in wastewater on subsequent fixed microbial aeration biochemical unit treatment.
(3) Adopting a microbial aeration biochemical treatment system to reduce pollutant concentration and increase nitrification stage to improve wastewater treatment efficiency and ensure stable operation.
(4) In order to further ensure that the water quality meets the standards, this process adopts a combination of two physicochemical and biochemical treatment processes to ensure that the effluent meets the discharge standards.
8, Process flow design of slaughterhouse sewage treatment equipment

Process flow description:
Slaughtering wastewater is collected through a collection pipe network and flows into a mechanical grid to remove large pieces of meat, floating debris, and small suspended solids such as animal hair. Then, it flows into an oil separation sedimentation tank to separate and settle the oil, bone debris, sediment, and other substances in the slaughtering wastewater. Then, it enters a pre aeration tank for regulation. A microporous aeration device is installed in the tank to regulate the water volume and homogenize the water quality, The sewage is then lifted by the sewage pump and enters the air flotation equipment. After the dosing reaction, the sewage enters the mixing zone of the air flotation system and comes into contact with the released dissolved water, causing the floc to adhere to fine bubbles before entering the air flotation zone. Under the action of air buoyancy, the floc floats towards the water surface to form scum. The clean water in the lower layer flows to the clean water tank through a water collector, and a part of it flows back for dissolved air use. The remaining clean water flows out through the overflow port. After the scum on the water surface of the air flotation tank accumulates to a certain thickness, it is scraped into the mud discharge area of the air flotation machine by a foam scraper and then discharged into the sludge tank. The dissolved air flotation machine mainly removes suspended organic matter and oil substances. After treatment, it enters the intermediate water tank to buffer the water volume and quality, and then is lifted by the sewage pump to the hydrolysis acidification tank. The hydrolysis acidification process is mainly used for sewage treatment processes with high organic matter concentration and high SS, and is a relatively important process. Hydrolysis (acidification) treatment method is a method that falls between aerobic and anaerobic treatment methods, and can be combined with other processes to reduce treatment costs and improve treatment efficiency. The hydrolysis acidification process controls anaerobic treatment in the first and second stages of anaerobic treatment with shorter reaction time based on the different growth rates of methane producing bacteria and hydrolysis acid producing bacteria. This involves the hydrolysis of insoluble organic matter into soluble organic matter under the action of a large number of hydrolysis bacteria and acidification bacteria, and the conversion of difficult to biodegradable macromolecular substances into easily biodegradable small molecule substances, thereby improving the biodegradability of wastewater, Laying a solid foundation for subsequent processing. After hydrolysis and acidification, the sewage is pumped into an integrated sewage treatment equipment. The microbial biochemical treatment unit inside the equipment removes the remaining pollutants in the wastewater through biological adsorption and degradation. The suspended solids and turbidity of the effluent are close to zero, and the purified sewage is disinfected and meets the standards before being discharged into the municipal sewage pipeline network.