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Novel enhanced coagulation wastewater treatment method

A technology for treating wastewater and coagulation, which is used in chemical instruments and methods, flocculation/sedimentation water/sewage treatment, water/sewage treatment, etc. and other problems to achieve the effect of reducing costs and optimizing the removal of pollutants

Pending Publication Date: 2021-05-14
联合环境技术(天津)有限公司
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Problems solved by technology

[0023] In order to solve the existing technical problems, the present invention proposes a novel enhanced coagulation method for wastewater treatment, which solves the poor solid-liquid separation effect of single-stage enhanced coagulation through two-stage coagulation under different pH environments. , High turbidity of effluent and incomplete removal of pollutants; it also solves the problem that the effluent of primary coagulation sedimentation in the existing secondary coagulation process has not been adjusted to the corresponding water quality but directly enters secondary coagulation sedimentation Therefore, the technical problem that the removal effect of the secondary coagulation cannot be optimized

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Embodiment

[0078] A sludge THP (thermal hydrolysis) anaerobic fermentation biogas slurry has high COD, high nitrogen, phosphorus and SS, and complex pollution components. The water quality is shown in Table 1. The biogas slurry from sludge fermentation has a certain biological inhibition effect. Without effective pretreatment, the biochemical system cannot operate effectively. The conventional primary coagulation and sedimentation treatment was previously adopted, adding 450mg / L (measured as Fe) ferric chloride, coagulation reaction for 2 hours, PAM dosage was 0.5mg / L, flocculation and sedimentation for 2 hours, and primary coagulation and sedimentation The water was still cloudy ( figure 2 Left), the water quality of the effluent is not very ideal (Table 1). Use the method of the present invention to process instead, and the first-stage coagulation and sedimentation process is: ferric chloride dosage is 400mg / L (measured in Fe), coagulation reaction 2h, PAM dosage is 0.5mg / L, floccula...

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Abstract

The invention provides a novel enhanced coagulation wastewater treatment method. The novel enhanced coagulation wastewater treatment method comprises the following steps of: S1, primary coagulation sedimentation: wastewater is introduced into primary coagulation sedimentation equipment, and a coagulant and a flocculant are added for coagulation reaction and solid-liquid separation; S2, aeration back-regulation of the pH value: the effluent of the primary coagulation sedimentation equipment enters aeration back-regulation equipment, and the pH value is back-regulated through aeration; S3, secondary coagulation precipitation: the effluent of the aeration back-regulation equipment enters secondary coagulation precipitation equipment, and a coagulant and a flocculant are added for secondary coagulation precipitation treatment; and S4, sludge treatment: sludge generated in the primary coagulation sedimentation step enters sludge concentration equipment for subsequent treatment, and sludge generated in the secondary coagulation sedimentation step flows back to the front end of the primary coagulation sedimentation equipment or is directly conveyed into the sludge concentration equipment for subsequent treatment. According to the method provided by the invention, different reaction conditions are respectively optimized in two-stage coagulation sedimentation, so that different types of substances can be efficiently removed, and the cost of an alkaline substance agent for regulating the pH value of the wastewater is saved or reduced by utilizing a method for back-regulating the pH by aeration in the pH back-regulation stage of two-stage coagulation.

Description

technical field [0001] The invention belongs to the field of waste water treatment, and in particular relates to a novel method for strengthening coagulation treatment of waste water. Background technique [0002] The enhanced coagulation method proposed by the American Hydraulic Engineering Association in the 1990s refers to the process of conventional coagulation treatment of water supply, under the premise of ensuring the turbidity removal effect, by increasing the dosage of coagulant or adjusting the pH Value, to improve the removal effect of natural organic matter (NOM) in conventional treatment, remove the precursor of disinfection by-products (DBPFP) to the greatest extent, and ensure that the disinfection by-products of drinking water meet the drinking water standards. [0003] In recent years, the enhanced coagulation method has been widely used in industrial wastewater treatment, especially in the pretreatment of difficult industrial wastewater such as chemical was...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C02F1/52C02F1/56C02F1/66C02F3/34
CPCC02F9/00C02F1/5245C02F1/56C02F1/66C02F3/34
Inventor 郭成洪林玉程李力阎怀国郭海军史英君洪刚
Owner 联合环境技术(天津)有限公司
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