What is the Process of high-rate trickling filters in STP?
High-rate trickling filters are comparable to regular or conventional trickling filters, with the exception that the rate of loading (hydraulic and organic) for high-rate filters is significantly higher, than that for traditional trickling filters. By using the method of recirculating sewage in high-rate trickling filters, the rate of loading is increased.
Let’s understand the process of high-rate trickling filters in STPs!
Characteristics of high-rate trickling filters
1: The High-Rate Trickling Filters (HRTF) are built similarly like normal trickling filters, but they also feature an effluent recirculation system.
2: One crucial and significant component of the HRTF is the recirculation of wastewater. As a result, the amount of TSS in the entering wastewater is lowered.
3: Higher hydraulic and organic loadings than low-rate filters are often characteristics of high-rate filters. A higher volume of waste is applied per unit surface area of the filter, to achieve increased BOD loading.
4: Recirculation is one way to boost a trickling filter's effectiveness. The hydraulic loading per unit area of the filter medium increases, when recirculation is utilized.
5: Higher flow velocities will consequently happen, leading to a more regular and uniform sloughing of extra growths. Under typical operation, high-rate trickling filters, including primary and secondary sedimentation, ought to remove 65 to 85 percent of the BOD from the wastewater.
Single Stage Filter vs. Two Stage Filter
One-stage or two-stage filters are both acceptable for high-rate trickling filters.
Single-stage filter: If there are two or more filters, they are run in parallel in a single stage filter plant, because sewage only passes through one filter there. Yet, sewage is repeatedly passed via each single stage filter.
The primary settling tank, parallel-operating filters, secondary settling tank, and facilities for recirculating the effluent, make up a single stage filter system.
Two-stage filter: Sewage is gradually routed via two filters that are installed in succession in a two stage filter. Thus, a two stage filter is made up of a main settling tank, two filters connected in series, an intermediate settling tank that may or may not be used, and a secondary settling tank.
For each level, recirculation facilities are offered. Either after settlement (in the intermediate settling tank) or without settlement, the effluent from the first stage filter is put on the second stage filter.
With the same total volume of filter media, two stage filtration will offer a higher level of treatment than single stage filtration. When the effluent BOD must be less than 30 mg/l, two stage filters are employed for the treatment of strong sewage.
Benefits of high rate trickling filters
- Effective in locations where large tracts of land are inaccessible, for land-intensive treatment methods.
- Depending on the medium used, efficient in treating significant volumes of organics.
- Power requirements are modest.
- Appropriate for populations with a small to medium size.
- Rapid reduction of soluble BOD-5 in wastewater.
Get your sewage treatment solutions from us!
Netsol Water is a top manufacturer of wastewater treatment facilities, and industrial and commercial water treatment facilities in India. For home and industrial wastewaters with medium to moderately high strengths, the high-rate trickling filter, single stage, and two stage are advised. The effluent is only slightly nitrified; however, the BOD removal effectiveness is between 75 and 90%.
We have provided the best high-rate trickling filters with outstanding durability, and wastewater purification capabilities. We have created and implemented new technologies. Our products are suitable for a range of applications. For further information, contact us at +91 9650608473 or firstname.lastname@example.org