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PTA (Pure Terephthalic Acid) sewage anaerobic sludge granulating accelerant

A technology of anaerobic sludge and granulation, which is applied in the direction of anaerobic digestion treatment to achieve the effect of improving the degradation effect, improving the degradation effect and improving the operation effect.

Active Publication Date: 2014-04-09
威海百克环保工程有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] There are few reports on the agents used to promote anaerobic sludge granulation in anaerobic reactors, especially for PTA sewage anaerobic treatment systems

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] 5000 kg of a PTA sewage anaerobic sludge granulation accelerator of the present invention, which contains 3800 kg of calcium chloride dihydrate (containing 100 kg of calcium, 20% by mass), 1000 kg of potassium chloride (containing potassium 500 kg, 10% by mass), 125 kg of ferric chloride (25 kg of iron, 0.5% by mass), 7.5 kg of hydrolase (0.15% by mass), 7.5 kg of polyacrylamide (0.15% by mass), 60 kg of caustic starch (1.2% by mass).

[0023] The sewage treatment unit of a PTA plant in Liaoning adopts pretreatment + UASB + aerobic + air flotation process. Among them, UASB system design parameters: water intake 400m 3 / h, influent COD 6000-8000mg / l, COD load 3.3-4.5kgCOD / m 3 .d, upflow velocity 0.5m / h, COD removal rate 60%. The corresponding UASB reactor is 24*20*9(10)m, totally 4 seats.

[0024] Start the anaerobic reactor for the first time and add PTA sewage aerobic excess sludge, chemical plant digested sludge, and paper mill anaerobic sludge. The old PTA plant ...

Embodiment 2

[0029] 5000 kg of a PTA sewage anaerobic sludge granulation accelerator of the present invention, which contains 3500 kg of calcium chloride dihydrate (950 kg of calcium, 19% by mass), 1250 kg of potassium chloride (950 kg of potassium 650 kg, 13% by mass), 170 kg of ferric chloride (35 kg of iron, 0.7% by mass), 7.5 kg of hydrolase (0.15% by mass), 12.5 kg of polyacrylamide (0.25% by mass), 60 kg of caustic starch (1.2% by mass).

[0030] The sewage treatment plant of a PTA plant in Jiangsu adopts pretreatment + improved UASB + two-stage aerobic + quicksand filtration process. Among them, the improved UASB system design parameters: water intake 350m 3 / h, influent COD 6000-8000mg / l, COD load 5.0-6.72kgCOD / m 3 .d, upflow velocity 2-3m / h, COD removal rate 75%. The corresponding UASB reactor is 20*18*14(15)m, totally two.

[0031] Start the anaerobic reactor for the first time and add PTA sewage aerobic residual sludge, configure PTA sewage COD3000-4000mg / l, N and P dosing a...

Embodiment 3

[0036]A PTA sewage anaerobic sludge granulation accelerator of the present invention is 3000 kg, which contains 1950 kg of calcium chloride dihydrate (510 kg of calcium, 17% by mass), 840 kg of potassium chloride (including potassium 405 kg, 13.5% by mass), 156 kg of ferric chloride (30 kg of iron, 1.0% by mass), 6 kg of hydrolase (0.2% by mass), 6 kg of polyacrylamide (0.2% by mass), 42 kg of caustic starch (mass percentage 1.4%).

[0037] The sewage treatment plant of a PTA plant adopts pretreatment + external circulation UASB + two-stage aerobic + air flotation process. Among them, UASB system design parameters: water intake 300m 3 / h, influent COD 6000mg / l, COD load 4.5kgCOD / m 3 .d, upflow velocity 0.5-1.5m / h, COD removal rate 75%. The corresponding UASB reactor is 15*22.5*8(9)m, totally 4 seats.

[0038] After the second startup of the anaerobic system of the sewage plant, the average water volume of the system is 230m 3 / h, COD5100mg / l, because the sludge in the UAS...

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Abstract

The invention belongs to the field of environmental-friendly sewage treatment, and in particular to a PTA (Pure Terephthalic Acid) sewage anaerobic sludge granulating accelerant. The accelerant is characterized by comprising the components as follows: calcium salt for providing calcium ions Ca<2+>, sylvite for providing potassium ions K<+>, ferric salt for providing ferric ions F2<3+>, hydrolase, polyacrylamide and caustic starch, wherein the accelerant comprises the components in percentage by weight as follows: 15-20% of Ca<2+>, 10-155 of K<+>, 0.5-105% of F2<3+>, 0.1-0.2% of hydrolase, 0.15-0.25% of polyacrylamide and 1.0-1.5% of caustic starch. By adequately considering granulating mechanism of PTA sewage anaerobic sludge, the accelerant provided by the invention has the advantages of strong pertinence, simpleness in addition and use and the like.

Description

technical field [0001] The invention belongs to the field of environmental protection sewage treatment, in particular to a PTA sewage anaerobic sludge granulation accelerator. Background technique [0002] With the increase in the number of domestic PTA factories, the number of supporting PTA sewage treatment devices is also increasing. Domestic PTA sewage treatment plants generally adopt a combination of anaerobic and aerobic treatment processes, and most anaerobic systems use traditional UASB or improved UASB. Since PTA sewage contains terephthalic acid, p-carboxybenzaldehyde, p-toluic acid and other components that are not easy to be degraded by anaerobic microorganisms or have an inhibitory effect on the growth of anaerobic microorganisms, the initial start-up period of the UASB system is long, and the secondary The start-up effect is unstable, resulting in that the sludge in the anaerobic reactor mostly exists in flocculent form, and the loss is serious. It is necessar...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F3/28
Inventor 赵曦波白岩君王猛
Owner 威海百克环保工程有限公司