Deep bed filter sewage treatment process

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The deep bed filter is a gravity flow sand filter. The raw water flows from the inlet channel of the filter tank, and passes through the new type of quartz sand homogeneous filter material, support layer, new filter brick, and finally the water distribution channel or collecting channel from the bottom.

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Description

Process characteristics:

The deep bed filter is a gravity flow sand filter. The raw water flows from the inlet channel of the filter tank, and passes through the new type of quartz sand homogeneous filter material, support layer, new filter brick, and finally the water distribution channel or collecting channel from the bottom. Flow out. It has the advantages of high load, land occupation, stable water supply and less backwash water. After the feed water is added to the carbon source, the deep bed filter can be converted into a denitrification filter, which can greatly remove the nitrate nitrogen in the sewage, thereby achieving the purpose of reducing TN.

The deep bed filter is the mainstream process for the domestic sewage treatment plant to upgrade the standard. It integrates the removal of SS, TP and TN, and the effluent can meet the Grade A standard of GB18918-2002.

Application scope:

Advanced treatment, upgrading and upgrading of sewage plant

Representative case:

Hangzhou Qige Wastewater Treatment Plant Phase IV Project, Jiaxing Haiyan Joint Wastewater Treatment Plant, Xiamen Tongan Wastewater Treatment Plant Phase III Project, etc.

Denitrification deep bed filter system and its operating principle:

The single function of the turbidity of the filter filter is transformed into a dual-function biological filter filter, and the single-cell completes the denitrification process and the filtration process, and aims to perform three-stage filtration on the secondary biological treatment effluent of the sewage treatment plant. This post-denitrification system can be called bio-remediation technology, which provides an effective measure for the effluent quality of the wastewater treatment plant. This is the denitrification deep-bed filter.

The composition of the denitrification deep bed filter mainly includes filter material, gravel layer, filter brick, seesaw, valve, backwash pump, instrument pipeline, control system, carbon source dosing system, etc., which have both filtering function and Biological nitrogen removal function. Among them, the filter material can filter and adsorb the denitrifying biological flora; the gravel layer can prevent the filter material from entering the water distribution system; the filter brick can distribute the backwashing gas; the seesaw can balance the influent and backwashing water; the valve is The water and gas components are controlled; the backwashing pump backwashes the filter material; the control system controls the equipment and components uniformly; the carbon source dosing system performs the carbon source dosage on the basis of analyzing the amount of nitrogen nitrate in the water. control.

The system operation principle of the denitrification deep bed filter is that after the effluent from the secondary settling tank enters the filter bed, the suspended solids are finally settled in the filter bed by means of sedimentation, filtration, interception, etc.; then they are discharged into the wastewater tank under backwashing, and filtered. The filtration performance of the layer is restored. In winter, due to lower temperatures, the rate of nitrification and denitrification will slow down. In order to solve the problem of insufficient carbon source, the filter will be converted into a denitrification filter by adding a carbon source. At this time, the operation of the denitrification filter, the filter layer is in anoxic state, and the denitrifying biological flora is attached to the surface. When the effluent passes through the filter layer, NO2 and NO3 in the sewage are adsorbed by the biofilm, and then reduced to N2, which is excluded from the sewage, and the process of denitrification and denitrification is realized. Moreover, the particulate filter material also has the effect of trapping the suspended matter.

Deep bed filter sewage treatment process

Figure 1: Unique filter brick system ensures uniform gas and water distribution

Deep bed filter sewage treatment process

Figure 2: Special specifications of sea sand filter to ensure better filtration

Process introduction:

The PDNFTM process is shown in the figure. The operation of the denitrification filter includes: 1 filtration, 2 nitrogen purge, 3 backwashing.

1 filter:

Mode 1: Direct filtration, deep bed filter direct filtration mode operation, efficient removal of SS, simultaneous improvement of BOD, COD and other pollutant removal effects, to ensure that the water reaches the standard.

Mode 2: Micro-flocculation filtration, when the total phosphorus exceeds the standard, it is easy to adjust to run according to the micro-flocculation deep bed filter, effectively remove SS and total P, and ensure that the effluent water quality is up to standard.

Mode 3: Biochemical denitrification and denitrification, when the TN can not reach the standard, the carbon source is added to the denitrification filter to ensure that the effluent water quality is up to standard.

2 nitrogen drive:

Nitrogen is generated during the denitrification process, so that the filter produces a gas barrier. The gas accumulated in the filter layer can be released by a separate water backflush to ensure the operation of the filter.

3 backwashing:

After the process of air washing→gas/water combined backwashing→separate water washing, the backwashing is thorough, the effect is good, and the water volume is small.

Deep bed filter sewage treatment process

Figure 3 Schematic diagram of PWT-PDNFTM process

Technical features:

Patent and software copyright:

At present, our company has applied for 5 patents for the development of denitrification deep bed filter technology, and has obtained 3 authorized patents, including 1 invention patent and 3 utility model patents. The patent content includes process operation and system equipment. New filter bricks, water system and other content. In addition, one software copyright was obtained for the automation control of the system.

Table 1 list of denitrification deep bed filter patents

Number	Type	Patent name	Application number / patent number
1	Patent	Operation method of denitrification deep bed filter system	2018 1 0204678.X
2	Utility model	Denitrification deep bed filter system equipment	2018 2 0340412.3
3	Utility model	Deep medium denitrification and dephosphorization water treatment system for heavy medium coagulation sedimentation deep bed filter	ZL 2017 2 0560662.3
4	Utility model	Effluent system of denitrification filter	ZL 2014 2 0498537.0
5	Utility model	Filter brick for a new type of deep bed filter	ZL 2015 2 0519616.X

Deep bed filter sewage treatment process

Pilot test device:

The pilot test equipment designed independently has participated in the pilot scale test of several sewage treatment plants in Shaoxing, Zhuhai and Nantong.

Deep bed filter sewage treatment process

Case introduction:

Table 2 Cases being implemented

Project name	Tongan Sewage Treatment Plant Phase III Project	Xiamen Xinglin Sewage Treatment Plant Phase III Project	Jiaxing United Wastewater Treatment Plant Improvement Project	Hangzhou Qige Wastewater Treatment Plant Phase IV
Time	August 2017	September 2017	December 2015	January 2017
Location	Tong'an District, Xiamen City	Xiamen Xinglin District	Haiyan County, Jiaxing City	Hangzhou
Scale(m3/d)	100,000	100,000	300,000	300,000
Influent water quality(mg/L)	TN≤20 SS≤15	TN≤20 SS≤20	TN≤20 SS≤20	TN≤20 SS≤25
Effluent water quality(mg/L)	TN≤8 needs to reach 90% guarantee rate; TN ≤ 10 needs to reach 100% guarantee rate.	TN≤8 needs to reach 90% guarantee rate; TN ≤ 10 needs to reach 100% guarantee rate.	TN≤15	TN≤10
Effluent water quality(mg/L)	SS≤8 needs to reach 90% guarantee rate; SS ≤ 10 needs to reach 100% guarantee rate.	SS≤8 needs to reach 90% guarantee rate; SS ≤ 10 needs to reach 100% guarantee rate.	SS≤10	SS≤8
Land occupation(m2)	1425	1680	3870	4553

Deep bed filter sewage treatment process

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

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Deep bed filter sewage treatment process