A metallurgical industry cold rolling acid wastewater treatment system device and its process method

Abstract

The invention relates to a metallurgical industry cold rolling acid wastewater treatment system device, which is characterized by comprising a regulating tank, a neutralization tank, a dosing device I, a dosing device II and a dosing device III, a flocculation tank, a sedimentation tank, a microporous ceramic filter, a water storage tank for the filter, an RO reverse osmosis device, a reuse water storage tank, a sludge concentrated tank and a mud water separator. The process comprises pre-aeration for flocculation neutralization, sediment muddy water separation by the sedimentation tank, first grade depth treatment by a full automatic microporous ceramic filter; and a second grade depth treatment by the RO reverse osmosis device. The invention starts from the source governance, aims at a permanent cure, and thoroughly solves the problems that the traditional lime milk technology used by the world steel industry for nearly 50 years can not realize "zero discharge" of sewage and resource utilization of sediment, and standard reached discharge after treatment produces new transfer pollution to downstream treatment plant, and damages and reduces the operation function of the sewage treatment plant and ecological environment of the main stem water quality.

Description

technical field [0001] The invention belongs to the technical field of environmental protection in which industrial waste water is reused instead of fresh water and the generated solid waste is utilized as a resource, and in particular relates to a metallurgical industry cold-rolled acid waste water treatment system device and a process method thereof. Background technique [0002] At present, there are thousands of cold-rolled acid wastewater production lines (stations) in the metallurgical industry at home and abroad, all of which adopt the traditional milk of lime process. Make the acidic wastewater neutral, and then add PAC (polyaluminum chloride) and PAM (polyacrylamide) to flocculate and precipitate, the supernatant water is discharged up to the standard, and the sediment is discarded and piled up as solid waste. This process is a backward technology in the 1960s. Its technical feature is standard discharge, which is no longer suitable for the current national require...

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Problems solved by technology

Existence: 1) Waste of new water consumes a lot of energy, and the life cycle of the equipment system is short; 2) CaCO is formed from unqualified pre-treated water 3 Serious membrane pollution makes it difficult to introduce follow-up membrane treatment technology; 3) The sediment is discarded and resources are lost, forming new secondary pollution; 4) Pollution of downstream water sources and increasing the cost of transferred sewage treatment; 5) Cannot directly meet the national discharge standards, It is even impossible to realize the recycling of water and sediment resources; 6) Active lime is a dangerous material, and its safety and stability are difficult to guarantee; 7) Lime milk is highly viscous and can easily block pipes and bond equipment, requiring frequent maintenance, large construction investment, and high maintenance costs. Issues affecting the adoption of automated continuous operation

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