Preparation method of modified attapulgite particles and method for accelerating granulation of anaerobic sludge by modified attapulgite particles

A technology of modifying attapulgite and attapulgite, which is applied in the field of water treatment, can solve problems such as easy dispersion of attapulgite, influence on sludge granulation effect, poor stability, etc., shorten sludge granulation time and improve operation Efficiency and stability, low cost effect

Active Publication Date: 2017-05-10
NANJING UNIV YIXING ENVIRONMENTAL PROTECTION RES INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although using the modified attapulgite of this application to cultivate activated sludge can shorten the sludge granulation time to a certain extent, and its COD removal rate is relatively high, but the attapulgite in this application is prone to dispersion and stability. Relatively poor performance, which affects the effect of sludge granulation

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  • Preparation method of modified attapulgite particles and method for accelerating granulation of anaerobic sludge by modified attapulgite particles

Examples

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Effect test

Embodiment 1

[0033] A method of using modified attapulgite particles to accelerate anaerobic sludge granulation in this embodiment, the steps are:

[0034] Step 1. Preparation of modified attapulgite particles: firstly carry out acid activation treatment on attapulgite, then carry out modification treatment to obtain modified attapulgite, and granulate modified attapulgite to obtain the modified attapulgite of the present invention. Attapulgite particles, the specific steps are as follows:

[0035](1) Acid activation: Add a hydrochloric acid solution with a molar concentration of 1 mol / L to the original soil of attapulgite, shake at room temperature for 30 minutes, filter after standing for precipitation, wash with deionized water until the pH value is 7, and dry at 105 ℃ drying in an oven, grinding and sieving to obtain acid-activated attapulgite, wherein the mass ratio of attapulgite raw soil to hydrochloric acid solution is 1:20. The number of pores and the specific surface area of ​​t...

Embodiment 2

[0045] The method of using modified attapulgite particles to accelerate anaerobic sludge granulation in this embodiment is basically the same as that in Example 1, the main difference is that the modified attapulgite particles account for 5% of the effective volume of the reactor, and the pH value of the influent 7.2. The water temperature is kept at 38°C, and the rising velocity of the water flow in the reactor is 0.8m / h.

Embodiment 3

[0049] The method of using modified attapulgite particles to accelerate anaerobic sludge granulation in this example is basically the same as in Example 1, the main difference is that the number of polyquaternium-7 taken is 3, and the modified attapulgite Soil particles account for 3% of the effective volume of the reactor, the pH value of the influent water is 7.5, the water temperature is 36°C, and the rising velocity of the water flow in the reactor is 0.7m / h.

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Abstract

The invention discloses a preparation method of modified attapulgite particles and a method for accelerating granulation of anaerobic sludge by the modified attapulgite particles and belongs to the technical field of water treatment. An anaerobic sludge blanket formed by anaerobic granular sludge and the modified attapulgite particles is formed at the bottom of a UASB (upflow anaerobic sludge blanket) reactor, attapulgite is granulated with sodium alginate after being modified with polyquaternium-7, then the modified attapulgite particles are fed into the anaerobic sludge, and the modified attapulgite particles account for 2%-5% of active volume of the UASB reactor; wastewater passes through the reactor from the bottom of the reactor from bottom to top, upward water flow and produced gas rise in the reactor, a better stirring effect is realized, and a suspended sludge layer is formed at the upper part of a sludge blanket reaction area. The modified attapulgite particles are added to active sludge, so that activity and flocculability of the sludge can be enhanced, content of extracellular polymeric substances of the active sludge is increased, the sludge granulation process is shortened, the removal rate of the reactor is increased, besides, the cost is lower, and the stability is good.

Description

technical field [0001] The invention relates to the technical field of water treatment, in particular to a method for preparing modified attapulgite particles and a method for accelerating anaerobic sludge granulation by using the same. Background technique [0002] UASB reactor, the upflow anaerobic sludge bed reactor, is a sewage anaerobic biological treatment device, also known as the upflow anaerobic sludge bed reactor, which was developed by Professor Lettinga in the Netherlands in 1977. . Sewage passes through the anaerobic sludge bed reactor from bottom to top, and the bottom of the reactor is a sludge layer with high concentration and high activity, where most organic matter is converted into CH 4 , CO 2 . The rising water flow and the nitrification gas produced form a relatively thin suspended sludge layer above the sludge layer. A three-phase separator is installed above the UASB reactor, the gas is collected into the gas collection chamber of the three-phase s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/28
CPCC02F3/2846Y02E50/30
Inventor 王庆黄辉任洪强王姗姗
Owner NANJING UNIV YIXING ENVIRONMENTAL PROTECTION RES INST
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