Zero-discharge treatment process for pickling passivation wastewater
A treatment process, pickling passivation technology, applied in water/sewage treatment, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc. The effect of effective operation
Pending Publication Date: 2017-05-10
宜兴市苏嘉环保设备有限公司
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Problems solved by technology
At present, the zero discharge in the Taihu Lake Basin requires the effluent water quality to reach: COD Cr ≤30mg / L, BOD r ≤5mg / L, turbidity ≤0.5NTU, NH 4 -N is zero discharge, total nitrogen is zero discharge, total phosphorus is zero discharge, the pH value is 6-9, and the salt content is ≤100mg / L, but the existing pickling passivation wastewater process obviously cannot meet the above requirements
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[0030] The present invention will be further described below with reference to the drawings and embodiments.
[0031] Such as Figure 1-2 Shown: A zero-discharge treatment process for pickling passivation wastewater, including a pretreatment process and an advanced treatment process. The steps of the pretreatment process are as follows:
[0032] 1.1) The pickling passivation wastewater is sent to the mechanical neutralization reaction tank through the wastewater lifting pump, and NaOH solution is added to adjust the pH value while stirring in the mechanical neutralization reaction tank to make phosphorus generate hydroxyapatite for removal;
[0033] 1.2) Calcium chloride solution is added during the process of sending the agitated wastewater to the micro-vortex clarification tank, and the coagulant is added to the micro-vortex clarification tank, and the insoluble sediment produced after full reaction is sent to the sludge tank and pressed The filter is processed into dry mud and tra...
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Abstract
The invention discloses a zero-discharge treatment process for pickling passivation wastewater. The zero-discharge treatment process comprises a pretreatment process and a deep treatment process, wherein the deep treatment process comprises the following steps: lifting the pretreated wastewater into a raw water tank; pressurizing the raw water with a raw water pressure pump, adding a bactericidal scale inhibitor, and then delivering to an ultrafiltration device; filtering the raw water with the ultrafiltration device, delivering to an ultrafiltration water producing tank, and then feeding into a nanofiltration security filter with a nanofiltration water supply pump for filtration; delivering the wastewater filtered by the nanofiltration security filter to a nanofiltration device for filtration, and then delivering to a nanofiltration water producing tank; delivering nanofiltration supernatant in the nanofiltration water producing tank to a reverse osmosis security filter by a reverse osmosis water supply pump for filtration, and delivering the filtered wastewater to a reverse osmosis device by a reverse osmosis high-pressure pump for filtration; delivering the reverse osmosis supernatant filtered by the reverse osmosis device to the reverse osmosis water producing tank, and producing and recycling by a recycling water pump. The treatment process provided by the invention reduces investment cost and can be operated stably and effectively after pretreatment and deep treatment.
Description
Technical field [0001] The invention relates to the technical field of pickling and passivation wastewater treatment, in particular to a zero-discharge treatment process for pickling and passivation wastewater that can meet the zero-discharge standard of wastewater. Background technique [0002] The existing pickling and passivation wastewater process, the wastewater discharge is in accordance with the discharge standard of the pipe, and the wastewater is discharged into the urban sewage pipe network after reaching the standard. The existing sewage treatment system includes: physicochemical and biochemical treatment processes, the system can operate stably, the effluent quality is stable, and the SS and colloids, organic pollutants, chroma, and surfactants in the wastewater have been mostly removed. The existing pickling passivation wastewater process can treat the raw water containing about 1500mg / L COD and then meet the requirements of the nanotube discharge standard (≤500mg / L)...
Claims
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IPC IPC(8): C02F9/04
CPCC02F9/00C02F1/444C02F1/442C02F1/441C02F1/50C02F1/00C02F1/001C02F2303/04C02F2303/20C02F5/08
Inventor 庄叶君
Owner 宜兴市苏嘉环保设备有限公司