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Bio-augmentation treatment sludge in-situ reduction method

A bioaugmentation and sludge technology, applied in the field of environmental biology, can solve problems such as unsatisfactory effects, difficult growth control, and easy sinking at the bottom of the pool, and achieve the effects of high promotion and application value, low operating costs, and quick results

Active Publication Date: 2013-07-31
ENVIRONMENTAL SCI RES & DESIGN INST OF ZHEJIANG PROVINCE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] From the published patents: 1. The sludge in-situ reduction technology that uses the addition of bacterial agents to strengthen the degradation of organic matter, although the operation is simple and the cost is low, the effect is not ideal, and the market application value is not great; Sludge reduction technology based on metazoan predation requires the use of fillers for growth (need to add an attached reactor), which is easy to sink to the bottom of the tank, and growth control is difficult. The ammonia nitrogen and total phosphorus in the effluent exceed the standard, and the process management control requirements are high. , it is difficult to promote

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Using beef extract peptone medium, the formula is beef extract 3g, peptone 10g, Nacl 5g, water 1000mL, pH7.4~7.6, and the yeast, Bacillus, Pseudomonas, photosynthetic bacteria and micrococcus 5 strains obtained by screening were in Cultivate separately in a 10L fermenter for 48 hours, and each obtain 6L of bacterial liquid; inoculate 30L of the above-cultured bacterial mixture into a 100L solid fermenter with an inoculum size of 30% and a solid medium composed of bran 50%, corn Core powder 10%, soybean meal 15%, starch 2%, urea 2%, sodium glutamate 0.5%, ammonium sulfate 2%, KH 2 PO 4 0.8%, add water to adjust the water content to 45% by weight, adjust the pH to 7.2, and ferment for 48 hours at a temperature of 36°C with ventilation and stirring, and then vacuum-dry to make a solid bacterial agent; the number of living bacteria detected by agar-coated plate culture is 10 14 CFU / g.

Embodiment 2

[0032] Adopt LB liquid culture medium, formula is peptone 10g / L, yeast extract 5g / L, sodium chloride 10g / L, culture 5 types of bacterial strains separately in 10L fermenter, culture time 24h, each obtains 4L of bacterial liquid; Inoculate 20L of the above-cultured bacterial mixture into a 100L solid fermenter with an inoculum size of 20%. The solid medium consists of 30% bran, 20% corncob flour, 5% soybean meal, 0.5% starch, 0.1% urea, corn Sodium Amino Acid 2%, Ammonium Sulfate 0.2%, KH 2 PO 4 0.1%, add water to adjust the water content to 65% by weight, adjust the pH to 6.0, and ferment for 24 hours at a temperature of 28°C with ventilation and stirring, and then vacuum-dry to make a solid bacterial agent; the number of living bacteria is 10 by ordinary agar plate culture 9 CFU / g.

Embodiment 3

[0034] The method is used for the in-situ reduction of sludge in the secondary treatment of urban domestic sewage activated sludge process, using anoxic / anaerobic / aerobic (AO / A 2 O) technology, influent water quality average COD 340 mg / L, BOD 155 mg / L, NH3-N 30 mg / L, TN 41 mg / L, TP 4.5 mg / L, SS 107 mg / L, water volume 25,000 t / d, the total hydraulic retention time is 14 h. The average effluent quality of the original process is COD 32 mg / L, BOD 7.6 mg / L, NH3-N 5 mg / L, TN 13 mg / L, TP 0.4 mg / L, SS 8 mg / L, and the total amount of residual sludge generated is 5.5 t / d (after plate and frame filter press, 85% water content). Do not change the original process for biointensification treatment. First, add 5 times the functional bacteria agent to the sterile water for aeration and activation for 2 days, and then use a peristaltic pump to feed it to the anoxic water inlet and the aerobic water inlet respectively, and the flow rate is 10 ppm. After continuous feeding for 2 w, the prope...

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Abstract

The invention discloses a bio-augmentation treatment sludge in-situ reduction method, which is characterized in that: on the basis of a traditional active sludge biochemical treatment system, functional microbial inoculum is additionally added to enhance organic matter degradation and a metazoan is additionally added to enhance predation so as to optimize a biotic community structure, so the sludge in-situ reduction can be realized during the sewage treatment process, and the sludge reduction effect can reach 60 percent to 100 percent. The functional microbial inoculum is a mixed flora which is specially used for the sludge reduction and is obtained through directed selection domestication culture and comprises five types of special bacterial strain selected from soil and active sludge. The metazoan is a vermes-typed micro metazoan which is selected in a laboratory and is used for the bio-augmentation predation of an active sludge system through the propagation. Through the bio-augmentation treatment method, the sludge in-situ reduction can be realized under the situation that the normal running of a sewage plant is not influenced, and the method has the characteristics of less investment, low running expense, fast action, stable running and the like. The method has general adaptability to ordinary sewage biochemical treatment systems.

Description

technical field [0001] The invention relates to the field of environmental biotechnology, in particular to an in-situ weight reduction method for biointensified sludge treatment. Background technique [0002] Activated sludge biological sewage treatment process is widely used in the treatment of urban sewage and industrial wastewater in my country, but the effective disposal of a large amount of excess sludge produced by it has also become a very difficult problem. The in-situ reduction of sludge by biological method is a low-cost sludge reduction technology, which can reduce the output of excess sludge from the source. The current research mainly has two directions: one is to reduce the amount of functional bacteria through external The second is to use metazoans to strengthen the predation effect to achieve sludge reduction. CN200810181192.5 discloses a method for controlling and reducing the sludge output of the wastewater biological treatment system by adding a special ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F11/02C02F3/12C02F3/02
CPCY02W10/10Y02W10/20
Inventor 李明智梅荣武喻治平韦彦斐张刚王慧荣沈浙萍李欲如
Owner ENVIRONMENTAL SCI RES & DESIGN INST OF ZHEJIANG PROVINCE
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