Method for purifying riverbed and treating sewage therefrom

Abstract

The purification riverbed provided by the present invention is arranged in a seriously polluted water basin, and diversion structures are respectively arranged at the upstream and downstream ends of the riverbed, and a plurality of purification reaction bodies are arranged between the two diversion structures. Micro-electrochemical functional powder materials are laid in the purification reaction body, and the micro-electrochemical functional powder materials include quartz monzobrick porphyry ore, hydrous magnesium silicate, potassium aluminum silicate, boron iron cyclic silicate and silicon dioxide powder. A method for treating sewage using the purification riverbed and its application are also provided. The purification reaction function of the purification riverbed of the present invention is long-lasting and stable, and the removal rate of pollutants such as total phosphorus and ammonia nitrogen can reach 70-95%, and the effluent standard is not lower than the surface IV, and the application range is wide, especially in the ecological restoration technology system of seawater pollution caused by land-based pollution transferred to the sea area through rivers entering the sea, which has the advantages of high efficiency, energy saving, low impact and green ecology.

Description

Technical Field

[0001] The present invention relates to the field of ecological environment protection, and in particular to a method for purifying a riverbed and treating sewage thereof. Background Art

[0002] The existing sewage basins generally contain more CODCR, total phosphorus, ammonia nitrogen, petroleum and heavy metal ions. The long-term accumulation of CODCR, total phosphorus, ammonia nitrogen, petroleum and heavy metal ions in sewage will only lead to further deterioration of sewage. The objects that need sewage treatment and restoration include: aquaculture wastewater along the main stream and tributaries, industrial park wastewater, farmland drainage, substandard discharge treatment station water, lake and reservoir water with extremely weak self-purification capacity, and the problem of various land-based pollutants being transported to offshore waters through rivers entering the sea. The existing sewage treatment methods are only suitable for small-scale domestic sewage treatment, and are not suitable for the restoration and management of deterioration of sea water quality caused by aquaculture wastewater along the main stream and tributaries, industrial park wastewater, farmland drainage, substandard discharge treatment station water, lake and reservoir water with extremely weak self-purification capacity, and land-based pollution through rivers entering the sea. Summary of the invention

[0003] In order to solve the above technical problems, the present invention provides a method for purifying a riverbed and treating sewage therefrom, and the specific scheme is as follows:

[0004] A purification riverbed is provided, wherein the riverbed is arranged in a seriously polluted water basin, and diversion structures are respectively arranged at the upstream end and the downstream end of the riverbed, and a plurality of purification reaction bodies are arranged between the two diversion structures.

[0005] Furthermore, the diversion structure is trapezoidal and made of cement material. Both sides of the diversion structure are provided with protrusions or grooves of symmetrical structure, and the bottom is provided with a diversion channel, which is arched.

[0006] Furthermore, the purification reaction body is mainly a conical cavity structure composed of four triangular blocks connected together, and each triangular block is respectively provided with a through channel.

[0007] Furthermore, a micro-electrochemical functional powder material is laid in the purification reaction body, and the micro-electrochemical functional powder material includes quartz monzonite porphyry ore, hydrous magnesium silicate, potassium aluminum silicate, boron iron cyclic silicate and silicon dioxide powder, and the particle size of the powder is not less than 300 meshes.

[0008] Furthermore, the micro-electrochemical functional powder material includes 15-20% quartz monzonite porphyry ore, 20-30% hydrous magnesium silicate, 20-30% potassium aluminum silicate, 30%-40% boron-iron cyclic silicate and 30%-40% silicon dioxide powder.

[0009] The purification riverbed is used in treating polluted rivers, ponds, rivers or lakes entering the sea.

[0010] The sewage treatment method for purifying a riverbed comprises the following steps:

[0011] (1) laying the purification riverbed in a seriously polluted water basin;

[0012] (2) The sewage enters the purification riverbed of step (1), and a plurality of purification reaction bodies laid in the purification riverbed provide a sewage flow channel. The sewage flowing through the purification riverbed is purified by the micro-electrochemical functional powder material laid in the purification reaction bodies. The diversion structures at the upstream and downstream ends of the purification riverbed control the water flow rate and water volume of the water in and out of the purification riverbed, so that the purification time of the sewage entering the purification riverbed is not less than 35 minutes, and finally flows out through the diversion structure at the downstream end of the purification riverbed.

[0013] Advantages of the present invention

[0014] The purification reaction function of the riverbed purification of the present invention is long-lasting and stable, and the removal rate of pollutants such as total phosphorus and ammonia nitrogen can reach 70-95%. The effluent standard is not lower than surface IV, and the application range is wide, especially in the ecological restoration technology system of seawater pollution caused by the transfer of land-based pollution to the sea through rivers entering the sea. It has the advantages of high efficiency, energy saving, low impact and green ecology, and is suitable for promotion. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic structural diagram of the riverbed purification method of the present invention.

[0016] Figure 2 for Figure 1 Schematic diagram of the structure of the diversion structure.

[0017] Figure 3 for Figure 2 A schematic structural diagram of another diversion structure.

[0018] Figure 4 for Figure 1 Schematic diagram of the structure of the purification reaction body.

[0019] Figure 5 This is a schematic diagram of the processing flow of the technical system for treating the deterioration of marine water quality caused by land-based pollution through rivers entering the sea in Example 1.

[0020] Figure 6a The monitoring data summary and change curve of the ammonia nitrogen concentration in the sewage of Example 3 are shown.

[0021] Figure 6b The monitoring data summary and change curve of the total phosphorus concentration in the sewage of Example 3 are shown.

[0022] Figure 6c The monitoring data summary and change curve of SS concentration of sewage in Example 3 are shown.

[0023] Figure 6d The monitoring data summary and change curve of COD concentration of sewage in Example 3 are shown.

[0024] Figures 1 to 4 middle:

[0025] 1: riverbed; 2: diversion structure; 3. purification reaction body; 4: through channel; 5: diversion channel.

[0026] Figure 5 middle:

[0027] AB segment: high tide period; BC segment: low tide period; CD segment: low tide period; DE segment: rising tide period. DETAILED DESCRIPTION

[0028] The present invention is further explained and illustrated below in conjunction with the accompanying drawings and specific embodiments. It should be noted that this specific embodiment is not intended to limit the scope of rights of the present invention.

[0029] like Figures 1 to 4 As shown, a purification riverbed provided by this specific embodiment, the riverbed 1 is set in the downstream water basin section with serious pollution, and the length of the riverbed 1 is determined according to the sewage flow rate and water volume, with the purpose of making the sewage stay in the riverbed 1 for no less than 35 minutes. The riverbed 1 is set in a straight, slightly curved, curved, bifurcated or wandering form according to the geographical location of the river, pond, river or lake that needs to be repaired and managed. The upstream and downstream ends of the riverbed 1 are respectively provided with diversion structures 2, which are trapezoidal and made of cement material. The two sides of the diversion structure 2 are respectively provided with symmetrical protrusions or grooves, and the bottom is provided with an arched diversion channel 5. The functions of the diversion structure 2 are: first, diversion and river water impact during flood control; second, strengthening the mechanical stability of the riverbed 1; third, helping the sewage entering the riverbed 1 to more fully contact with the purification reaction body 3 laid in the riverbed 1, so as to achieve a more effective purification reaction.

[0030] A plurality of purification reaction bodies 3 are arranged between the two diversion structures 2. Specifically, the purification reaction body 3 is mainly composed of a conical cavity structure composed of four triangular blocks connected, and each triangular block is provided with a through hole 4. 15-20% micro-electrochemical functional powder material is laid in the purification reaction body 3. The micro-electrochemical functional powder material belongs to a non-consumable and non-chemical type micro-electrochemical mineral functional material, which is an intrinsically safe composite natural mineral functional material with extremely sensitive thermal and force release response functions. When in contact with water, it can produce a variety of micro-electric functions including inert electrode reaction, electrocatalysis and water electrolysis reaction, and can significantly remove various pollutants in the water body. The micro-electrochemical functional powder material includes 15-20% quartz monzonite porphyry, 20-30% hydrous magnesium silicate, 20-30% potassium aluminum silicate, 30%-40% boron iron cyclic silicate and 30%-40% silicon dioxide powder. The particle size of the powder is not less than 300 meshes.

[0031] The purpose of the purification reaction body 3 is, firstly, to be a structure with long-term sewage purification function, which can be stably laid in a staggered stack in the riverbed 1 to provide a flow channel for sewage; secondly, to reduce the water flow rate and increase the residence time of sewage in the riverbed 1 to achieve a sufficient purification effect.

[0032] The sewage treatment method using riverbed purification includes the following steps:

[0033] (1) The purification riverbed is laid in a seriously polluted water basin. Preferably, the purification riverbed is laid in a seriously polluted downstream water basin. The length of the riverbed 1 is determined according to the sewage flow rate and water volume.

[0034] (2) The sewage enters the purification riverbed of step (1), and a plurality of purification reaction bodies 3 laid in the purification riverbed provide a sewage flow channel. The sewage flowing through the purification riverbed is purified by the micro-electrochemical functional powder material laid in the purification reaction body 3. The guide structures 2 at the upstream and downstream ends of the purification riverbed control the water flow rate and water volume of the water in and out of the purification riverbed, so that the purification time of the sewage entering the purification riverbed is not less than 35 minutes, and finally flows out through the guide structure 2 at the downstream end of the purification riverbed.

[0035] The application of riverbed purification in the treatment of polluted rivers, ponds, rivers or lakes entering the sea.

[0036] Example 1 Application of riverbed purification in ecological restoration and treatment of deterioration of sea water quality caused by land-based pollution through rivers entering the sea

[0037] There are two technical issues that deserve high attention and in-depth discussion: one is the problem of the transfer rules of pollutants stimulated by the rise and fall of seawater tides, and the other is the effect of the rise and fall of tides on the secondary release of bottom mud near the confluence of rivers and seas, which aggravates the dual pollution of seawater and river water. Moreover, there is also a complex correlation between the two in which pollution crosses and influences each other.

[0038] According to the objective natural phenomenon of the normality and periodicity of the rise and fall of seawater, the tidal energy formed provides a considerable driving force for the round-trip transfer of pollutants in the water between the sea and the onshore basin. In this process, the process of re-dilution of pollutant concentration and the process of re-increasing concentration are always accompanied. At the same time, the rise and fall of seawater will greatly stir and stimulate the underwater sediment layer rich in various pollutants in the area where the river and the sea meet to release and deposit them again. At this time, the fixed boundaries between the sea and the basin, and between the sea and the land become blurred, which also increases the technical complexity of the management of the sea and the basin entering the sea.

[0039] The above-mentioned purified riverbed is used for ecological restoration to treat the deterioration of sea water quality caused by land-based pollution through rivers entering the sea. The specific implementation method is as follows:

[0040] (1) The riverbed is set in the downstream river section where the pollutants in the sewage river entering the sea are more seriously enriched in the bottom mud, the gradient is small, and the mixed water body of polluted seawater and river sewage is filled for a relatively long time during high and low tides. The length of the riverbed is determined according to the flow rate and water volume in the sewage river entering the sea during low tide. The purpose is to ensure that the water stays in the riverbed for no less than 35 minutes. If necessary, another riverbed can also be arranged in the river section where land-based pollution entering the river is more concentrated;

[0041] (2) diversion structures made of cement are installed at the downstream and upstream ends of the riverbed. The diversion structure at the downstream end is used for diversion and resistance to wave impact during high tide, and the diversion structure at the upstream end is used for diversion and resistance to river water impact during flood season. The purpose of the diversion structure is to strengthen the mechanical stability of the riverbed on the one hand; on the other hand, it helps the mixed water to be more fully in contact with the purification reaction body laid in the riverbed during high and low tide, so as to achieve a more effective purification reaction;

[0042] A purification reaction body made of cement into a conical cavity structure is installed between the diversion structure at the downstream end and the diversion structure at the upstream end, and 15-20% of micro-electrochemical functional powder material is filled in the purification reaction body to form a riverbed with long-term sewage purification function. The riverbed can be stably laid in an interlaced stack and can stay firmly in place during the high and low tides, and provide a flow channel for seawater and river water during the high and low tides. During the low tide period of about 1 hour twice a day, the mixed water body of seawater and river water flowing through the riverbed and filling the riverbed is purified on site, and the purified mixed water body is sent back to the offshore waters during the low tide period, thereby playing a role in ecological restoration of the seawater.

[0043] In other river sections that discharge sewage into the sea other than the purified riverbed, the micro-electrochemical functional powder materials and biological bacteria are used for targeted spraying treatment in lower and curved parts of the river to stabilize pollutants in the riverbed mud and curb the tendency and risk of secondary release into the water body during the rising and falling tides.

[0044] According to the above installation application of riverbed purification, such as Figure 5 As shown, this embodiment 1 reasonably utilizes the tidal energy formed by the two daily tides of the sea as the driving force of the water body, and the purification process is carried out twice a day with the tide and repeated forever, and the following restoration and treatment process is established, namely: "Seawater is continuously poured into the river entering the sea during the tide period → pollutants in the river sediment are activated and released into the seawater entering the river channel for a second time → the polluted seawater is fully mixed with the sewage in the river → a specially set purification riverbed will dynamically purify the mixed water body flowing through the river channel → the mixed water body is stably purified on-site by the purification riverbed for a period of time before and after entering the flat tide period → sewage from the upstream of the river entering the sea is continuously dynamically purified while flowing through the purification riverbed during the ebb tide period → the purified mixed water body is returned to the sea area during the ebb tide period until the flat tide period". This treatment technical system cannot replace the important role of land source control and pollution interception, but it is an important link in the ecological restoration and management of the water body and sediment of the river entering the sea polluted by land sources, and it is also a necessary supplement for the implementation of source control and pollution interception in the affiliated rivers.

[0045] The purification reaction body provided by the present invention for establishing a purified riverbed and stabilizing the bottom mud is completely different from the well-known chemical agent reaction materials and easily saturated activated carbon and other filter materials, and is also completely different from the activated sludge and membranes used in various biochemical methods. Its purification reaction function is long-lasting and stable, insensitive to changes in the marine environment and its climatic conditions, and has a low risk of secondary pollution. In particular, it is easy to make various components, which is also a relative advantage that other reaction materials do not have. The use of the purified riverbed can make the removal rate of pollutants such as total phosphorus and ammonia nitrogen 70%-95%, and the effluent standard is generally not lower than surface IV.

[0046] This embodiment 1 is an ecological restoration and treatment technology system for seawater pollution caused by land-based pollution transferred to the sea through rivers entering the sea. It rationally utilizes the tidal energy formed by the twice daily rise and fall of the sea water as the driving force of the water body. This natural phenomenon occurs twice a day with the tide and repeats itself forever. The established ecological restoration technology system has the relative advantages of high efficiency, energy saving, low impact and green ecology. It is an overall technical solution that can significantly reduce the risk of pollution to the sea caused by sewage rivers entering the sea.

[0047] Example 2 Application of riverbed purification in large ponds in Sandongqiao Village, Yixing to treat rural domestic sewage

[0048] The purification riverbed was installed in the severely polluted downstream section of the large pond in Sandongqiao Village, Yixing, to treat the mixed water body of rural domestic sewage. The sewage was injected into the purification riverbed through a lifting pump, and the water was discharged from the bottom and passed through the flocculation sedimentation unit and the phosphorus and nitrogen removal unit. The hydraulic retention time was about 60-70 minutes. The actual data for August and September are shown in Table 1:

[0049] Table 1:

[0050]

[0051]

[0052] Note: The * waterfall effluent in the table is the effluent test data of a village in Yixing that originally used an anaerobic and waterfall aerobic treatment station from a university. The data in brackets is the removal rate.

[0053] Example 3 Application of Purified Riverbed in Sewage Treatment Plant to Treat Municipal Domestic Sewage

[0054] The purification riverbed was installed in a severely polluted watershed of a sewage treatment plant in Guiyang to treat local urban domestic sewage containing a certain proportion of industrial sewage. The overall residence time of sewage entering the purification riverbed is 100 to 120 minutes. The purification riverbed has been in use for nearly two months. Figure 6a , 6b As shown in 6c and 6d, the removal rates of ammonia nitrogen, total phosphorus, COD and SS are always stable at 70-95%. The size of the purification riverbed is set as: length 8000 x width 2000 x height 2500 (mm).

[0055] Example 4 Application of Purified Riverbed in Artificial Lake Ecological Restoration and Management Project

[0056] The purification riverbed was installed in the watershed section of the artificial lake in Heqiao Town Park, Yixing, where the water was seriously polluted. The bottom mud of the artificial lake was purified to improve the water quality of the inferior V lake water. By sampling points A and B, the ammonia nitrogen, total phosphorus and chemical oxygen demand of the lake water were compared before and after use, as shown in Table 2.

[0057] Table 2:

[0058]

[0059] Example 5 Application of Purified Riverbed in Treating Highly Acidic Wastewater in Chemical Fiber Plants

[0060] The purification riverbed was installed in a severely polluted watershed of a chemical fiber factory in Xinxiang, and used in a demonstration project to treat 2,000 tons of highly acidic chemical fiber wastewater and safely reuse the treated reclaimed water. The field measured data of this Example 5 is shown in Table 3:

[0061] Table 3:

[0062]

[0063]

Claims

1. Purify riverbed, characterized in that, The riverbed is arranged in a seriously polluted water basin section, and diversion structures are arranged at the upstream and downstream ends of the riverbed respectively, the diversion structures are trapezoidal, and are made of cement material, and protrusions or grooves of symmetrical structures are arranged on both sides of the diversion structures respectively, and a diversion channel is arranged at the bottom, and the diversion channel is arched, and a plurality of purification reaction bodies are arranged between the two diversion structures, and the purification reaction body is a conical cavity structure composed of four triangular blocks connected to form a through hole, and a micro-electrochemical functional powder material is laid in the purification reaction body, and the micro-electrochemical functional powder material includes 15-20% quartz monzonite porphyry ore, 20-30% hydrated magnesium silicate, 20-30% potassium aluminum silicate, 30%-40% boron iron cyclic silicate and 30%-40% silicon dioxide powder, and the particle size of the powder is not less than 300 meshes.

2. Use of the purified riverbed according to claim 1 in treating polluted rivers, ponds, rivers or lakes entering the sea.

3. A sewage treatment method, characterized in that: The steps include: (1) Laying the purification riverbed described in claim 1 in a seriously polluted water basin; (2) The sewage enters the purification riverbed of step (1), and a plurality of purification reaction bodies laid in the purification riverbed provide a sewage flow channel. The sewage flowing through the purification riverbed is purified by the micro-electrochemical functional powder material laid in the purification reaction bodies. The diversion structures at the upstream and downstream ends of the purification riverbed control the water flow rate and water volume of the water in and out of the purification riverbed, so that the purification time of the sewage entering the purification riverbed is not less than 35 minutes, and finally flows out through the diversion structure at the downstream end of the purification riverbed.

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