Dairy production waste water treatment method

Abstract

The invention relates to the technical field of dairy production waste water treatment, and discloses a dairy waste water treatment method. The method comprises the following steps: adopting ABR+UASBcombined process to treat the dairy production wastewater, so that the COD of the effluent of the anaerobic stage can be stabilized below 150mg / L. The effective effect of the invention is that the process is stable, the automation degree is high, the operation and maintenance cost is low, the dairy production wastewater and the sludge output can be effectively treated, and the final effluent can reach the first-class standard of Discharge Standard of Pollutants for Municipal Wastewater Treatment Plant(18918-2002). At the same time, the sludge production decreased significantly, the process ofbiogas production closed utilization, energy conservation and emission reduction benefits are significant, belonging to clean production.

Description

technical field [0001] The invention relates to the technical field of wastewater treatment, in particular to a treatment method for dairy production wastewater. Background technique [0002] Dairy production wastewater mainly comes from the cleaning process of containers, pipes, equipment, workshops and a small amount of domestic sewage. The main pollutants include not only milk protein, lactose, milk fat, etc., but also COD as high as 800-3500mg / L. With the rapid development of the dairy industry and the continuous deepening of environmental protection requirements, clean production, effective reduction of pollutant emissions, process material flow test management and closed-circuit circulation of resources are important directions for industry and social development. [0003] At present, the treatment methods of dairy production wastewater are mainly physical and chemical methods, biochemical methods, etc., specifically involving ABR and other processes to treat wastewate...

AI Technical Summary

Problems solved by technology

The content of milk fat and milk protein that is difficult to degrade reaches 2 / 3, which brings great difficulties to the entire wastewater treatment process

In particular, the inhibition of anaerobic processes by non-acidic soluble proteins has seriously affected the entire dairy wastewater treatment industry

[0005] The traditional ABR process treats dairy wastewater. Milk protein denatures and coagulates, and enters the aerobic system directly in the form of sludge, resulting in a large amount of sludge. At the same time, the low anaerobic removal rate leads to high power consumption for sewage treatment , low biogas production

[0006] If the UASB process is used alone, due to the high content of milk fat in the wastewater, which is attached to the sludge in large quantities, the sludge will float up and be carried out with the water, making it difficult to retain the sludge in the process, resulting in abnormal operation of the process and low biogas production

[0007] In view of the above-mentioned influence of milk fat and milk protein, the high amount of sludge produced will easily reduce the storage capacity of the regulating tank and the hydrolysis tank, and blockage will also occur. Continuous dredging is required, and the labor cost is high, which increases the difficulty of system operation and maintenance.

[0008] In addition, the above situation has resulted in unfavorable situations such as low efficiency in the anaerobic section of dairy production wastewater treatment, unsatisfactory water discharge effect, difficulty in long-term stable operation and maintenance, large sludge volume and high power consumption, which has become a difficult problem for dairy wastewater treatment