Device and method for comprehensive treatment of alkali deweighting wastewater

Abstract

The invention discloses a device and a method for comprehensive treatment of alkali deweighting wastewater. The device comprises an adjusting tank, an acid precipitation-sedimentation tank, a concentration tank and a filter press, wherein two water storage parts of the adjusting tank are respectively communicated with the acid precipitation-sedimentation tank and a coagulative precipitation-sedimentation tank through pipelines, two groups of clapboards are arranged in the coagulative precipitation-sedimentation tank, a PAM adding device is arranged on the inner wall of the water storage part on the side, away from the adjusting tank, of the coagulative precipitation-sedimentation tank, the side, away from the adjusting tank, of the acid precipitation-sedimentation tank is communicated witha micro-electrolysis reactor through a pipeline, and the bottom of the acid precipitation-sedimentation tank is communicated with a concentration tank through a pipeline. The effluent COD is smallerthan 200mg / L and reaches the indirect discharge standard specified by the textile dyeing and finishing industrial water pollutant discharge standard, the pH value is 6-9, the TN is smaller than 15mg / Land the TP is smaller than 0.5 mg / L and reach the direct discharge standard specified by the textile dyeing and finishing industrial water pollutant discharge standard, and meanwhile, the method hasthe characteristics of low medicament consumption, high sewage comprehensive treatment efficiency and low cost.

Description

technical field [0001] The invention relates to the technical field of wastewater treatment, in particular to a device and method for comprehensive treatment of alkali-reduction wastewater. Background technique [0002] The alkali reduction process is an important processing technology in the printing and dyeing industry, and it is one of the important methods to deal with polyester fibers. It changes the properties of polyester fibers, but at the same time it also produces high-concentration, refractory wastewater. The alkali reduction wastewater contains relatively Too much terephthalic acid (TA) and other impurities, high COD and high pH will cause environmental pollution and waste of resources. The water volume of alkali reduction process wastewater accounts for a small proportion of printing and dyeing wastewater, but the amount of TA it discharges accounts for The COD of all mixed wastewater is more than 50%, and the alkali reduction wastewater is directly mixed into t...

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Problems solved by technology

[0002] The alkali reduction process is an important processing technology in the printing and dyeing industry, and it is one of the important methods to deal with polyester fibers. It changes the properties of polyester fibers, but at the same time it also produces high-concentration, refractory wastewater. The alkali reduction wastewater contains relatively Too much terephthalic acid (TA) and other impurities, high COD and high pH will cause environmental pollution and waste of resources. The water volume of alkali reduction process wastewater accounts for a small proportion of printing and dyeing wastewater, but the amount of TA it discharges accounts for The COD of all mixed wastewater is more than 50%, and the alkali reduction wastewater is directly mixed into the ordinary printing and dyeing wastewater, which will cause the original sewage treatment system to fail to meet the standard. The conventional sewage treatment process can no longer meet the treatment requirements of the alkali reduction wastewater. It is necessary to find a suitable and efficient alkali reduction wastewater treatment method

[0003] At present, there are many treatment methods for alkali reduction wastewater, such as acid analysis method, alkali analysis method, coagulation sedimentation method and biological method, etc., but each treatment method has its own advantages and disadvantages. The direct acid analysis method needs to consume A large amount of acid, the treatment cost of the alkali analysis method is relatively high, and a large amount of calcium chloride needs to be added. The coagulation method needs to consume a large amount of flocculant and reduces the purity of terephthalic acid. The high concentration of TA and Other impurities make direct biodegradation less efficient

The existing treatment method is to firstly carry out acid analysis pretreatment on the alkali reduction wastewater and then mix it with other printing and dyeing wastewater. However, the amount of alkali reduction wastewater acceptable to the ordinary printing and dyeing wastewater treatment system is very limited, and a large amount of acid and alkali is required to adjust the pH

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