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Wastewater treatment

A waste water and horizontal technology, applied in food industry waste water treatment, water treatment parameter control, biological water/sewage treatment, etc., can solve the problems of sludge settling degradation, interference stability and reliable EBRP method development, etc.

Inactive Publication Date: 2009-11-04
ENVIRONMENTAL BIOTECH CRC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] However, complete nitrification of wastewater containing high levels of ammonium and other nitrogen sources produces high levels of nitrates that interfere with the development of robust and reliable EBRP methods
[0010] Another difficulty in developing effective biological methods for the simultaneous removal of nitrogen and phosphorus from slaughterhouse wastewater is that such wastewater contains large amounts of fats and oils (FOG), which when fed directly to activated sludge systems Settling deterioration

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0164] Example 1-Treatment of slaughterhouse wastewater, discharged into the drain

[0165] Establishment and operation of the reactor

[0166] In these studies, a laboratory-scale SBR with a working volume of 7L (according to figure 1 And above to build. See also Figure 15 ). The SBR was inoculated with non-EBPR (enhanced biological phosphorus removal) sludge from a real-scale SBR from Queensland, Australia that treats slaughterhouse wastewater. Since there seems to be no EBPR organisms in the initial inoculation sludge used, 1L of EBPR sludge enriched in the laboratory reactor (MLSS about 4g / L) was added on the 60th day to initiate the EBPR process in the reactor . The SBR was run in a temperature-controlled room (18-22°C) with a cycle time of 6 h. In each cycle, 1L of slaughterhouse wastewater (details are shown below) was pumped into the reactor during three filling periods, and the volume distribution was 0.5L, 0.3L and 0.2L, respectively. After each filling period is no ae...

Embodiment 2

[0217] Example 2-Slaughterhouse wastewater treatment for land irrigation

[0218] This plan is used to develop the operating strategy of SBR to produce effluent quality suitable for land irrigation. The same multi-feed principle used to produce effluent suitable for river discharge is used. However, the order of execution is different.

[0219] Land irrigation requires a high level of biological oxygen demand (BOD) removal (>95%), and a moderate level of nitrogen and phosphorus removal. It is believed that the presence of total phosphorus at a level of 10-20 mgP / L and total nitrogen at a level of 50-100 mgN / L in the treated effluent may be suitable for this purpose. Relative to nitrate, ammonia / ammonium is the preferred form of nitrogen in the final process effluent for land applications.

[0220]The SBR was inoculated with sludge from a local slaughterhouse in Queensland in June 2005 and constructed similarly to that described in Example 1. It started from June 2005 to August 200...

Embodiment 3

[0234] Example 3-Establish and maintain nitrosation / denitrification through automatic aeration control

[0235] This research focuses on aeration control to achieve nitrogen removal through nitrite instead of nitrate (see Figure 10A with 10B ). The control strategy is based on the slope of the pH signal and the oxygen uptake rate (OUR). During the aeration period, once the maximum pH value is reached and begins to decrease, the pH slope is calculated.

[0236] When the slope of the pH signal is lower than the minimum value input by the operator, the first condition for automatically stopping aeration is met.

[0237] The second condition is OUR. Since the purpose of the on-off aeration control system is to control DO in the reactor, OUR is directly related to O 2 The time the valve is "closed" is proportional to the filling time. When the valve is closed for longer than the maximum time entered by the operator, the second condition is met.

[0238] The third "safe" condition appl...

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Abstract

The present invention provides a biological process for reducing the levels of nitrogen and phosphorous in wastewater, wherein said wastewater comprises at least 100mg / L total nitrogen wherein said process comprises feeding said wastewater into a reaction vessel in at least two steps, wherein said reaction vessel comprises an active biomass comprising nitrifying and denitrifying organisms and polyphosphate accumulating organisms (PAOs), wherein at least the first feed step is followed by a non-aerated period of sufficient duration to result in sufficiently low concentrations of NOx species in the wastewater to allow for accumulation of polyhydroxyalkanoates in the PAOs, and at least the first non-aerated period is followed by an aerated period of sufficient duration to allow for ammonium oxidation by the nitrifying organisms and assimilation by the PAOs of at least a portion of the phosphorous in the wastewater.

Description

Technical field [0001] The present invention relates to a biological method for at least partially removing nitrogen, phosphorus, and BOD from wastewater with extremely high nitrogen levels and relatively high phosphorus levels, such as slaughterhouse wastewater. Background technique [0002] The meat processing industry requires a large amount of water, most of which is discharged as high chemical oxygen demand (BOD) wastewater containing high levels of nutrients such as nitrogen (N) and phosphorus (P). [0003] Similar to the high BOD and nitrogen levels in the waterway, the presence of excessive phosphorus in the waterway also has a greater hidden danger because it may promote eutrophication. As the main source of phosphorus, including farmland runoff and various household, commercial and industrial processes, the removal of phosphorus in the wastewater treatment process has great environmental significance. [0004] In the past two decades, the removal of BOD and N from slaug...

Claims

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Application Information

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IPC IPC(8): C02F3/30C02F3/34C02F9/14
CPCC02F2101/322C02F3/302C02F2209/08C02F2103/32C02F3/306C02F2209/14C02F2209/06C02F3/308C02F2209/18C02F2209/22
Inventor 袁志国乔格·奇乐罗曼·L·G·黎马瑞
Owner ENVIRONMENTAL BIOTECH CRC
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