What are the various Sludge Storage Requirements?
When sludge is to be stored or transferred between various facilities, sludge storage tanks are installed.
Sludge withdrawn intermittently from the primary settling tank, secondary settling tank, and gravity thickener is to be continuously loaded to the post treatment stages and the sludge storage tanks are installed. These tanks are sometimes used when sludge needs to be stored for an extended length of time, such as when sludge dewatering equipment is only used during the day and sludge created in a small-scale facility needs to be stored, or when sludge needs to be temporarily transported.
Factors deciding Sludge Storage Tank Requirements
A: Sludge Storage Tank Capacity
The amount of sludge carried into and pulled out of the tank, the sludge transfer process (continuous, intermittent), and the storage period necessary for O&M should all be considered when determining tank capacity.
Since sludge storage tanks are typically positioned underground, a waterproof reinforced concrete structure with no groundwater permeability should be used. Corrosive gases such as hydrogen sulphide may be released, hence an anti-corrosive coating should be put to the tanks inside surface to prevent corrosion.
C: Number of Tanks
A minimum of 2 tanks, each with a capacity of 50%, may be given.
Scum and sediments will form at the bottom as a result of this process. Thus, air should be blown as needed, or a scum skimmer or agitator should be fitted.
E: Odours in Tank and Deodorization
To prevent leaks, scents should be caught and deodorized. The suction capacity should be greater than the blowing capacity when using air agitation.
F: Methods of Ultimate Disposal
The follo?wing are the techniques of final disposal:
1: Dewatered sludge is reused in agricultural land or landfills in its natural state;
2: Agricultural land applications offer the benefits of simplicity and low costs, but there are safety concerns, such as bacteria; as a result, the addition of a digestion stage and quality stabilization is recommended. In this treatment process, there are also concerns with odour generation and transportation, necessitating environmental considerations. When using sun-dried bedding, special precautions must be taken.
3: Dewatered sludge is dried in granular form by mechanical drying, solar drying, or composting to increase safety and handling abilities before being used as fertilizer on agricultural land.As a result, this type is recommended for use on agricultural land.
4: Dewatered sludge is burnt or fused, with the ash or slag being utilized as construction materials or landfills.
5: With PCB approval, thermal or sun dried sludge can be utilized as a low-grade fuel.
Back-up Techniques of Sludge Handling and Disposal
Back-up sludge handling and disposal solutions must be prepared in the event that sludge treatment and disposal are not possible owing to the failure of sludge treatment facilities.
Consider the following strategies as a backup:
1: Liquid sludge storage in empty or unoccupied settling tanks, etc., and solid sludge storage in open space at STPs if available;
2: Using a tanker lorry to transport liquid sludge to other STPs;
3: Get the mobile dewatering machine ready.
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