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Efficient water treatment device and water treatment method

A water treatment device and high-efficiency technology, which is applied in the directions of water/sewage multi-stage treatment, water/sludge/sewage treatment, osmosis/dialysis water/sewage treatment, etc., to save the cost of chemicals, reduce disinfection by-products, and relieve panic Effect

Active Publication Date: 2014-04-23
PACIFIC WATER TREATMENT ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, just as the effluent quality of the traditional process cannot meet the standards, the effluent of the dense medium coagulation sedimentation process cannot meet the standards in terms of microorganisms, Escherichia coli and other indicators

Method used

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  • Efficient water treatment device and water treatment method
  • Efficient water treatment device and water treatment method
  • Efficient water treatment device and water treatment method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] In the operation of the water treatment process, if excessive magnetic powder, PAC and PAM are added in the dense medium coagulation and sedimentation stage, it will not only increase the operating cost, but also aggravate the membrane fouling. The dosing amount of magnetic powder, PAC and PAM is also different due to the different water quality of the water source. Here, water is taken from the lower reaches of the Yangtze River (raw water turbidity: 50-100 NTU, COD Mn : 2-4 mg / L) as an example, such as figure 2 , image 3 and Figure 4 As shown, the dosages of magnetic powder, PAC and PAM in the dense medium coagulation and sedimentation stage (process residence time 10min) were 100 mg / L and 10 mg / L (in the form of liquid polymerized AlCl 3 ρ=1.24g / ml) and 0.1 mg / L are more suitable. At this time, the turbidity removal rate of dense medium coagulation sedimentation water is about 99% (can be lower than 1 NTU), and the COD Mn The removal rate is about 40% (about 1...

Embodiment 2

[0056] In order to investigate the impact of the type and dosage of polymer coagulants used in the water treatment process on membrane fouling, three common polymer flocculants were selected here: cationic polyacrylamide (CPAM), nonionic polyacrylamide (PAM) and anionic polyacrylamide (APAM). The dosages of heavy medium and flocculant polyaluminum (PAC) adopt the preferred dosages in Example 1, which are 100mg / L and 10mg / L respectively. Membrane Flux Operating Flux of 20 Lm -2 h -1 , the running time is 24h. Dimensionless transmembrane pressure difference (NTMP=△P / △P 0 ) change as Figure 5 and Figure 6 Shown: Compared with only adding PAC, the addition of CPAM helps to reduce the membrane fouling, while the addition of APAM will increase the membrane fouling. For PAM, when the dosage is 0.1mg / L, the membrane fouling will be reduced, but when the dosage is 1mg / L, the membrane fouling will increase significantly. Preferably, CPAM should be selected as the polymer floccu...

Embodiment 3

[0059] Table 1: Key effluent quality indicators of dense media coagulation sedimentation / ultrafiltration water treatment process

[0060]

[0061] In order to investigate the effluent water quality of the water treatment process, the following operating conditions were adopted: the dosages of CPAM, PAC and heavy medium were 0.1mg / L, 10mg / L and 100mg / L respectively. Membrane operating flux is 20 Lm -2 h -1 , the running time is 40min. The backwashing method is air-water backwashing, and the washing intensity is 50Lm -2 h -1 , the air washing intensity is 50m 3 / (m 2 membrane pool h), each 60s. As shown in Table 1, the impact of dense media coagulation sedimentation / ultrafiltration treatment on NTU and COD Mn Removal rates of over 99% and 45% respectively; due to the good quality of raw water, the removal effect of total phosphorus and ammonia nitrogen is not obvious here; the removal rate of total coliforms and total bacterial colonies can reach 100%, and no Detecte...

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Abstract

The invention discloses an efficient water treatment device and a water treatment method. The efficient water treatment device is composed of an immersible pump, an original water pool, a pipeline mixer, a sludge pool, a stirring machine, a dense medium coagulation reaction pool, an empty pipe, a PAC (Poly Aluminium Chloride) dosing pump, a PAC storage tank, a dense medium recovery system, a PAM (Polyacrylamide) dosing pump, a PAM storage tank, a sludge pump, a sludge pipe, a disinfectant and chemical cleaning agent dosing device, a rapid settling pool, a water producing or chemical cleaning pipeline, a membrane pool, a disinfectant dosing pipeline, a ultrafiltration membrane module, an aerating system, a cam pump, a water producing or chemical cleaning internal-circulating pipeline, a clean water pool and a sewage draining pipeline. Original water enters the dense medium coagulation reaction pool and then enters the rapid settling pool, excess sludge in the bottom of the settling pool enters the dense medium recovery system, and recovered dense medium reenters a reactor to form circulation. Drained water of the rapid settling pool enters the membrane pool to be filtered and then enters the clean water pool to be disinfected. The efficient water treatment device has the characteristics of saving the used land area and civil engineering cost, good quality of drained water, stable and efficient operation and good economical efficiency, and the dense medium can be recycled.

Description

technical field [0001] The invention relates to the technical field of water treatment, in particular to a high-efficiency water treatment device, and also to a water treatment method using the device. Background technique [0002] In the process of expansion and upgrading of urban water supply facilities, there are two issues worthy of attention: (1) the increasingly precious urban land restricts the application area for new expansion; (2) the space restriction of old water plants for retrofitting technology. These problems make us urgently need to adopt new and efficient water treatment technology when facing the increasing water supply and increasing water quality requirements. [0003] The traditional coagulation and sedimentation process has a long residence time (1-1.5h) and a large footprint, which has gradually become the limiting factor for the development of water treatment processes. Due to the addition of recyclable heavy medium in the coagulation process, the d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F1/52C02F1/56C02F1/50C02F1/44
Inventor 杨志宏范青如冯金荣梅从明秦爱冬贾伯林吴红辉杨雪峰张振华陈晓丹夏存娟
Owner PACIFIC WATER TREATMENT ENG
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