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Food processing & fermentation wastewater

Food processing & fermentation wastewater

1. Project Overview

  A biotechnology company in Northeast China is a large-scale carrier base for amino acid production. The company's main products and annual output are glutamic acid, monosodium glutamate, starch, starch sugar, threonine, lysine, compound fertilizer, etc., and its annual output ranks among the top in the world. The raw water mainly comes from fermentation, corn steep liquor preparation, saccharification, refining and evaporation and other processes. The concentration of pollutants is high, the biodegradability is good, and the concentration of nitrogen and phosphorus is high. The sewage system is operating normally, and all indicators are within the environmental protection requirements.


  In July 2018, the total nitrogen of the effluent was required to be raised to below 15mg / L, and the total nitrogen could not be removed due to defects in process conditions. After friendly negotiation, Making Green Environmental Protection carried out technical transformation and used Making Green Biological Promotion Denitrifying Strain MicroBoost@ -Den to quickly establish a denitrification system to reduce the total nitrogen concentration in the effluent.


2. Making Green Technical Route

  1) Process transformation, from the original anaerobic + A / B + sand filtration process to anaerobic + A / O + sand filtration process;

  2) By adding biological promotion denitrifying bacteria MicroBoost@ -Den in A pond, a denitrification system can be quickly established to reduce the total nitrogen in the effluent and meet the requirement for total nitrogen standard.


3. Commissioning summary

  Biochemical inlet and outlet water quality data before commissioning:

Name

COD

(mg / L)

Ammonia nitrogen (mg / L)

Total nitrogen (mg / L)

Total phosphorus (mg / L)

water intake

3500-5000

200-300

200-400

20

Water out

≤40

≤2

40-100

≤0.5

  Making Green Environmental Protection discovered the transformation plan of the tool through on-site investigation. The plan requires completion without stopping the system, and considers low investment and strong operability.


  The secondary aerobic increase nitrification liquid reflux pump matching reflux pipeline to the primary aerobic inlet, the design of the nitrification liquid reflux ratio is 3.5 times, in the first-level aerobic increase buoy mixer for denitrification stirring, the original A / B process is transformed into / O process.


  After the transformation is completed and the conditions for injecting bacteria are added, add Mianjin Environmental Protection MicroBoost@-Den in A pool. The amount of bacteria injected is as follows:

Time

Dosage of bacteria (kg / d)

Day 1-5

150

Day 6-10

50

  The ammonia nitrogen in the effluent after 8 days of inoculation has a downward trend. The total nitrogen in the effluent after 15 days of inoculation is less than 15mg / L. After reaching the standard, the total nitrogen in the effluent is less than 10mg / L on average, reaching the expected target. The data during commissioning is as follows:

  to sum up:

  1) During the commissioning period, the highest total nitrogen in the inlet water is 372mg / L, and the lowest is 305mg / L. In the case of fluctuations in the total nitrogen concentration of the incoming water as high as 22%, the total nitrogen in the effluent began to decline after 8 days of inoculation, indicating that Nitrobacteria MicroBoost@ -Den can quickly adapt to the proliferation in this project, and the denitrification system is quickly established;


  2) The total nitrogen in the effluent reaches the expectation 15 days after the inoculation. After reaching the standard, the total nitrogen concentration in the effluent is stable, with an average of less than 10mg / L. The denitrifying bacteria in the system are efficient and stable;


  3) The reform ideas provided by Making Green Environmental Protection meet the requirements of the owners, with low investment cost and strong operability.