<h1 class="pgc-h-arrow-right" data-track="1" > Product Description:</h1>
Sodium acetate, also known as sodium acetate, is a sodium salt derived from acetic acid. Sodium acetate is a substance that is easily made with vinegar and baking soda. When the mixture is cooled below the melting point, it crystallizes. Crystallization is an exothermic process, so these crystals actually produce heat, which is why the substance is often referred to as hot ice. This compound has a variety of industrial and everyday uses.
Main indicators:
Assay:58-60%
Appearance: Solid crystal
Water insoluble substances: ≤0.05%
Wastewater applications:
Treat municipal sewage and study the effects of mud age (SRT) and additional carbon sources (sodium acetate solution) on the effect of system nitrogen and phosphorus removal. Sodium acetate was used as a supplementary carbon source to domesticate the denitrification sludge, and then the pH increase during the denitrification process was controlled within the range of 0.5 using a buffer solution. Denitrifying bacteria can overabsorb CH3COONa, so when denitrification with CH3COONa as an applied carbon source, the COD value of the effluent can be maintained at a low level. At present, all cities and counties' sewage treatment needs to add sodium acetate as a carbon source if it wants to meet the emission level one standard.
Calculation of the amount of input:
During the hypoxic denitrification phase, the nitrate nitrogen in the sewage (NO3-N) is reduced to gaseous nitrogen (N2) under the action of denitrifying bacteria. Denitrification is a biochemical reaction performed by heterotrophic microorganisms that use oxygen in nitrates (NO3-N) as electron acceptors and organic matter (carbon sources) as electron donors at very low dissolved oxygen concentrations.
In the actual project, if the sewage BOD5:N < 4:1 entering the denitrification section, the applied carbon source, BOD5/N≥4, should be considered to be completely denitrified. When the carbon source is insufficient, the amount of carbon source added by the system can be calculated according to the corresponding amount of nitrate nitrogen removed, and the calculation formula is as follows:
The amount of dosing X = ( 4-CBOD5 /Cn) × Cn/η
thereinto:
CBOD5: BOD5 concentration of inlet water, mg /L; Cn: TN concentration of inlet water, mg/L; η: BoD5 equivalent of the carbon source.
The BOD5 equivalent of sodium acetate is 0.52 (mgBOD/mg sodium acetate), so when sodium acetate is added as a carbon source, the calculation formula is as follows:
The amount of injection X = ( 4-CBOD5 /Cn) × Cn /0.52
Instance Calculation:
Taking the reconstruction and expansion project of a municipal sewage treatment plant as an example, the designed water treatment amount is 160,000 m3 /d, and the designed water quality reaches the national level A standard, and the main indicators of the water quality of the inlet and outlet water are shown in the table:
Table Water quality index of inlet and outlet water of sewage treatment plant
In this project, the sewage plant originally built a section A aeration tank, after the sewage passes through the A section aeration tank, the removal rate of BOD5 is calculated as 25%, so the BOD5 concentration in the sewage entering the new denitrification tank is 262. 5 mg /L, TN concentration of 70 mg/L, BOD5∶N= 3. 75 < 4, so the carbon source should be added, sodium acetate dosage:
X=( 4-3. 75) × 70 /0.52 = 33. 7 mg/L
The daily injection volume is:
X*16000=0.0337*16000=539.2kg /d