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Improved activated sludge process in wastewater treatment

A technology for activated sludge and waste streams, applied in animal processing wastewater treatment, natural water body treatment, water/sewage treatment, etc., can solve the problem of expensive chemical coagulants

Inactive Publication Date: 2016-04-20
ECOLAB USA INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Chemical accelerators are expensive

Method used

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  • Improved activated sludge process in wastewater treatment
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Example 1 describes the cost of using chemical accelerators to treat highly polluted waste streams.

[0034] A highly polluted waste stream (37,000gpd) was assessed to determine whether chemical accelerators could be used to treat the increased pollutants. The results are shown in Table 1. Typical COD, oils, fats and grease, and TSS concentrations for this waste stream are 85,560 ppm, 2,100 ppm, and 21,333 ppm, respectively.

[0035] Table 1 - Estimated Accelerator Chemical Costs

[0036]

[0037] Table 1 shows that if chemical accelerators are used to treat highly polluted waste streams, there is an additional $185,806 in raw material costs to the waste treatment process.

Embodiment 2

[0039] Example 2 examines the effectiveness of this method for treating a highly polluted waste stream. The method was tested on waste streams from pet food processing plants. The waste stream has a flow rate of 30,000 gpd and an influent COD of 36,080 ppm. The waste activated sludge had a flow rate of 6,000 gpd (average 3,000) and a bacterial concentration of 10,000 ppm. The waste stream and spent activated sludge are combined. The ratio of waste activated sludge to the influent stream was an average of 10% and a maximum of 20%. Then add cationic polyacrylamide flocculant. Exemplary cationic polyacrylamide flocculants are commercially available from Kemira, Ciba (BASF), Stockhausen, and SNFF Loerger. No chemical accelerators are used in this method. The results are shown in Table 2.

[0040] Table 2 - Effectiveness of waste activated sludge on COD removal

[0041] Initial COD

36,080ppm

COD at 5 minutes (without polymer flocculant)

6630ppm

...

Embodiment 3

[0045] Example 3 examines the effectiveness of this method for treating a highly polluted waste stream. The method was tested on waste streams from food processing plants. The waste stream has a flow rate of 37,000 gpd and an influent COD of 85,560 ppm. The waste activated sludge had a flow rate of 35,000 gpd and a bacterial concentration of 20,000 ppm. The waste stream and spent activated sludge are combined. The ratio of waste activated sludge to influent stream was an average of 33% and a maximum of 50%. Then add cationic polyacrylamide flocculant. The results are shown in Table 3. No chemical accelerators are used in this method.

[0046] Table 3 - Effectiveness of waste activated sludge on COD removal

[0047] Initial COD

[0048] Table 3 shows that waste activated sludge is a preferred replacement for chemical coagulants, and effectively removes a significant percentage of COD.

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PUM

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Abstract

The present disclosure relates to an improved activated sludge process in wastewater treatment, specifically to methods of treating highly contaminated wastewater using waste activated sludge as an adsorbent.

Description

[0001] This application is a divisional application of an invention patent application with an application date of May 9, 2011, an application number of 201180026353.3, and an invention title of "Improved Activated Sludge Method in Wastewater Treatment". technical field [0002] The present disclosure relates to a method of treating highly polluted wastewater using waste activated sludge as an adsorbent. Background technique [0003] During waste treatment, pollutants need to be removed before discharge. Insoluble contaminants can be physically separated and removed, while soluble contaminants can be metabolized biologically. Bacteria can be used to break down or metabolize soluble contaminants. This bacteria is usually part of a composition called activated sludge. Once the bacteria have been used to break down the soluble pollutants, a portion of the activated sludge (called return activated sludge) is recycled back into the process to continue metabolizing the pollutant...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/12C02F3/28C02F3/30
CPCC02F1/24C02F1/286C02F1/56C02F3/12C02F9/00C02F2103/22C02F2103/327C02F1/5245C02F3/1215C02F3/1221Y02W10/10C02F3/1226
Inventor D·B·米歇尔D·J·瓦格纳K·阿德赫-曼萨
Owner ECOLAB USA INC