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Heavy medium coagulation sedimentation process (magnetic coagulation)

The heavy medium coagulation and sedimentation process is a new type of water treatment process independently researched and developed by the company.

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Description

The heavy medium coagulation and sedimentation process is a new type of water treatment process independently researched and developed by the company. It is commonly known as “magnetic coagulation and sedimentation process”. At present, the company has established the first domestic heavy water powder production line for water treatment. The process is an extremely rapid precipitation technique in which the inert high-density microparticles are used as flocculation nuclei to aid in the formation of flocs. The heavy medium provides high concentration and high density flocs that act as ballast or weighting to accelerate the precipitation process. Compared with the traditional process, the process has the advantages of good phosphorus and organic removal effect and small footprint.

Scope of application: municipal (industrial) sewage treatment plant upgrading, chemical special wastewater dephosphorization, black and odor river treatment, storm water treatment, low temperature and low turbidity water treatment, etc.

Principle introduction:

The heavy medium coagulation and sedimentation process (PWT-DLCSTM) is a kind of extremely fast sedimentation technology, also known as magnetic coagulation process, magnetic medium coagulation and sedimentation process, and heavy medium powder is also called magnetic powder. The technology adopts micron-sized (300-500 mesh) inert high-density heavy medium powder particles (Fe3O4 powder) as flocculation nucleus to form high-concentration and large-density composite flocs under superior hydraulic conditions, and the composite flocs are in the pole. The precipitation process is completed in a short time, so that the water body is quickly purified. The main pollutant removal indicators are SS and TP, and the removal rate is 80%-99%. Under the economical dosage, the effluent SS and TP can be controlled at 5-6mg/L and 0.2-0.3mg/L, respectively. It has a certain removal effect on COD, and the removal rate is 20-60% depending on the characteristics of organic matter. The process has strong impact load resistance.

The heavy (magnetic) medium separation process mainly utilizes the combination of flocs and heavy medium (high density) particles, as shown in Fig. 1, to increase the floc density, thereby completing the precipitation process in a very short time. In the engineering design, the design value of the flow velocity on the sedimentation tank can reach 15-20 m/h. Therefore, the process unit covers only 80-120 m2/m3, which is only 25% of the unit land of the advection sedimentation tank. -35%, 30%-60% of the floor area of the inclined tube/plate sedimentation tank.

Heavy medium coagulation sedimentation process (magnetic coagulation)

Fig.1 Comparison of morphology and precipitation effect of composite flocs in heavy (magnetic) medium (precipitation time 30s)

Heavy medium coagulation sedimentation process (magnetic coagulation)

　　Figure 2 Comparison of heavy (magnetic) medium coagulation sedimentation tank and advection sedimentation tank (300,000 m3/d)

Process introduction:

As shown in Figure 1-2, the source water first enters the reaction cell 1 and is quickly mixed with the added coagulant into the reaction 2 pool, and performs primary flocculation reaction with the PAM and heavy medium particles added in the reaction 2 tank. After the primary flocculation is completed, the reaction into the third tank is carried out for the second-stage flocculation reaction, and the size of the heavy medium composite flocs is further grown. The water after completion of the reaction enters the sedimentation tank for solid-liquid separation. The floc at the bottom of the sedimentation tank is directly returned to the reaction tank 2 through the sludge pump, and partially flows to the heavy medium recovery system. The recovered heavy medium particles enter the reaction tank 2 for reuse, and the remaining sludge is discharged into the sludge tank for dehydration treatment. .

At present, the company has applied for 32 patents for the development of coagulation and sedimentation process of heavy (magnetic) media, and has obtained 20 patents. The patent covers the process, magnetic separator, flocculation machine, heavy medium powder, clarifier online cleaning. Scraper, etc., the technical development content is comprehensive and diverse. In addition, one software copyright was obtained for the automation control of the system.

Table 1 Heavy medium coagulation sedimentation tank patent list

Number	Type	Patent name	Patent No
1	Patent	Formula, preparation method and application method of heavy medium powder for water treatment	2017 1 0223746.2
2	Patent	Heavy medium powder in-situ unpacking and adding machine	2017 1 0606699.X
3	Utility model	Small heavy medium powder quantitative dosing machine	2017 2 0900036.4
4	Utility model	Heavy medium powder in-situ unpacking and adding machine	2017 2 0899625.5
5	Patent	Axial flow high efficiency heavy medium magnetic separator	ZL 2015 1 0042955.8
6	Utility model	Axial flow high efficiency heavy medium magnetic separator	ZL 2015 2 0059633.X
7	Utility model	Heavy medium separator water distribution device	ZL 2016 2 0047968.4
8	Patent	Double cavity high efficiency floundering machine	2016 1 0400363.3
9	PCT international patent	Double cavity high efficiency floundering machine	PTC/CN2017/089992
10	Utility model	Heavy medium powder condensate flocculation machine	ZL 2015 2 0561702.7
11	Utility model	Double cavity high efficiency floundering machine	ZL 2016 2 0549870.9
12	Utility model	Efficient flocculation machine	ZL 2016 2 0522462.4
13	Utility model	Heavy medium powder floc floundering machine	ZL 2015 2 0658318.9
14	Patent	Sampler and detection method for detecting content of heavy medium powder in water	2017 1 0240315.7
15	Utility model	Sampler for detecting the content of heavy medium powder in water	2017 2 0385937.4
16	Utility model	Sedimentation tank water outlet sound absorbing sound insulation noise reduction cover	ZL 2012 2 0293711.9
17	Utility model	Pipeline heavy medium powder trap	2017 2 0440711.X
18	Utility model	Drainage type heavy medium powder trap	2017 2 0561464.9
19	Utility model	An easy-to-clean channel test medium powder trap	2017 2 0864792.6
20	Utility model	Air-washing sedimentation tank for inclined tube sedimentation	ZL 2016 2 0047974.X
21	Utility model	Water treatment sampler for preventing sediment deposition	2017 2 0690037.0
22	Patent	Efficient and compact coupling water treatment device and processing method thereof	ZL 2014 1 0034780.1
23	Utility model	High-efficiency heavy medium/activated carbon coagulation sedimentation water treatment device	ZL 2015 2 0699417.1
24	Utility model	Heavy medium activated carbon coupling water treatment device	ZL 2015 2 0658253.8
25	Patent	Oxygen-containing heavy medium activated sludge reactor for water treatment	2016 1 0400359.7
26	Utility model	Heavy medium coagulation sedimentation/deep bed filter deep denitrification dephosphorization water treatment system	2017 2 0560662.3
27	Patent	High-efficiency water treatment device and water treatment method	ZL 2014 1 0034155.7
28	Utility model	High-efficiency water treatment device	ZL 2014 2 0045912.6
29	Patent	Sequencing batch heavy medium flocculation sedimentation water treatment equipment	ZL 2015 1 0042979.3
30	Patent	Efficient emergency safety water treatment equipment and process	2016 1 0654363.6
31	Utility model	Efficient emergency safety water treatment equipment	ZL 2016 2 0865478.5
32	Patent	Mobile container water plant and water production process thereof	ZL 2013 1 0041245.4

Heavy medium coagulation sedimentation process (magnetic coagulation)

Heavy (magnetic) medium coagulation sedimentation process software copyright

Honor:

The heavy medium coagulation and sedimentation process/equipment was awarded the “First (set) Major Equipment and Key Components” certification of the 2016 Tongshi Economic and Information Committee and the “Good Technology of China” issued by the China Productivity Promotion Center.

Heavy medium coagulation sedimentation process (magnetic coagulation)

High-tech products:

The heavy medium coagulation and sedimentation process equipment won 2 titles of high-tech products in Jiangsu Province.

Heavy medium coagulation sedimentation process (magnetic coagulation)

Process standard setting:

Formulated 4 enterprise standards for complete sets of equipment products, and is cooperating with China Municipal Engineering North China Design and Research Institute to prepare national engineering construction industry standards for heavy medium coagulation and sedimentation process.

Table 2 List of standard preparations

National engineering construction standards
1Technical specification for treatment of heavy medium coagulation sedimentation water		Second editorial unit, in preparation
Business standard
1	Efficient heavy medium water treatment equipment	Q/320602YK05-2017
2	Heavy medium powder for water treatment	Q/320602YK10-2016
3	Heavy medium floc floundering machine	Q/320602YK11-2016
4	Heavy medium powder separator	Q/320605YK12-2017
5	Centrifugal magnetic medium sludge pump	Q/320602YK15-2018

Representative application case:

1. Susu Industrial Park Sewage Treatment Plant

Treatment scale: 10000 m3/d, the proportion of chemical wastewater in the influent water is about 70%, the main feature is low COD and high TP, and the TP is high after the second sinking water. Effluent: SS<6 mg/L, TP=0.15-0.32 mg/L. The on-line turbidity meter generally displays 0.2-0.5 NTU, and the sedimentation tank effluent has a visible depth of more than 2 meters.

Heavy medium coagulation sedimentation process (magnetic coagulation)

2. Huai'an Development Zone Wastewater Treatment Plant

Treatment scale: 80000 m3/d, the industrial water represented by chemical wastewater in the influent water accounts for about 70%, the influent TP concentration is high, and the biochemical section process is CASS process, the effluent water volume fluctuates greatly, and the peak value reaches 6000m3/h. The impact on the original biochemical secondary sedimentation tank is large, the effluent SS and TP are not up to standard, the conventional coagulation and sedimentation process can not stably guarantee the water output index, and the available land area in the plant area is insufficient, so the heavy medium coagulation sedimentation is adopted in the design. Debugging the running phase.

Heavy medium coagulation sedimentation process (magnetic coagulation)

Detailed technical application consultation: Mr. Jia 18605134911, Mr. Shi 13506282131