Treatment process for treating gelatin wastewater

Abstract

The invention discloses a treatment process for treating gelatin wastewater. The treatment process includes steps of delivering the wastewater to primary settling tanks and carrying out settlement treatment on the wastewater; draining wastewater treated by the primary settling tanks into Fenton tanks, carrying out oxidation treatment on the wastewater, to be more specific, adding Fenton reagents into the Fenton tanks, carrying out oxidation reaction, then adding PAC (polyaluminum chloride) into the Fenton tanks, then adding PAM (polyacrylamide) into the Fenton tanks, settling the wastewater bymeans of standing, then conveying lower-layer sludge in the Fenton tanks to sludge treatment units, delivering upper-layer wastewater into flotation tanks and continuing to treat the upper-layer wastewater. The treatment process has the advantages that Fenton oxidation methods are used with the PAC and the PAM, accordingly, raw water of the gelatin comprehensive wastewater can be sufficiently flocculated and settled, comprehensive indexes of the wastewater can be lowered to a great extent, flotation treatment in later periods can be omitted, follow-up treatment load on A/O (anaerobic/anoxic)tanks can be relieved, and the wastewater treatment cost of enterprises can be effectively saved.

Description

technical field [0001] The invention relates to the field of gelatin wastewater treatment, in particular to a treatment process for treating gelatin wastewater. Background technique [0002] At present, most domestic bone gelatin production enterprises use the traditional alkaline process to make gelatin. The process includes: pickling→acidification and water washing→liming→ash removal and water washing→neutralization→water washing→heating and gel extraction→refining treatment→concentration→evaporation→extinguishing Bacteria→squeeze glue and dry. This process consumes 600-1000 tons of water per ton of gelatin, produces 10-20 tons of solid waste, and has a large amount of waste residue and waste water. The waste water produced contains a large amount of soluble protein, including A large number of colloids, oils, organic particles, suspensions and emulsions. This kind of wastewater is difficult to settle and clarify naturally in alkaline media. It must be treated by physical ...

AI Technical Summary

Problems solved by technology

As common knowledge in the industry, the coagulation effect of PAC is worse than that of PAM, but the stability of PAC is better than that of PAM, and the adsorption effect on tiny flocs is better. At the same time, PAC is not sensitive to the pH value and temperature of wastewater. The coagulation effect of PAC as the main coagulant is worse than that of PAM as the main coagulant. Therefore, the use of PAC and PAM by Liu Huantong et al. did not exert the best coagulation effect of the two, that is, That is to say, Liu Huantong and others did not find the difference between PAM and PAC in the process of flocculation and sedimentation, nor did they discover the respective coagulation characteristics of the two, so they did not give full play to the best coagulation effect of the combined addition of PAC and PAM

At the same time, the combined use of PAC and PAM is only for insoluble flocs in wastewater, but has no flocculation and sedimentation effect on dissolved macromolecular proteins in wastewater. Therefore, there is a large room for improvement in the flocculation and sedimentation effect of this method.

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