Method for promoting anaerobic reaction and inhibiting calcification by pre-acidifying high-calcium papermaking industrial wastewater with whey

A papermaking industry wastewater, anaerobic reaction technology, applied in water treatment parameter control, chemical instruments and methods, water/sewage treatment, etc. The effect of stable characteristics

Active Publication Date: 2019-11-22
GUANGXI UNIV
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  • Application Information

AI Technical Summary

Problems solved by technology

Decomposing calcified sludge by sludge discharge method did not get good results

Method used

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Effect test

Embodiment 1

[0019] A method for promoting anaerobic reaction and inhibiting calcification by using whey pre-acid treatment of high-calcium papermaking industrial wastewater, the steps are: this embodiment is a pre-acidification treatment of a paper mill in Guangxi, the raw water TCOD concentration is 8000 ± 536mg / L, The calcium ion concentration is 300±50mg / L. First, add papermaking industrial wastewater and cheese whey to the pre-acidification tank. The cheese whey is added from the lower end of the acidification tank through a pipeline. The volume ratio of cheese whey to papermaking industrial wastewater is 1:10 to make the wastewater system nutritionally balanced. The size of the pre-acidification tank 800m 3 . Set up a stirring device in the pre-acidification tank to mix the papermaking wastewater and cheese whey evenly, adjust the speed of the rotor to 170r / min, keep the water temperature in the container at room temperature, and keep the pH value of the solution at 5.5, in order to...

Embodiment 2

[0021] A method for promoting anaerobic reaction and inhibiting calcification by using whey pre-acid treatment of high-calcium papermaking industrial wastewater, the steps are: this embodiment is pre-acidification treatment of a waste paper mill in Guangxi, and the TCOD of raw water is 8000±1350mg / L , the calcium ion concentration is 350±43mg / L. First add papermaking industrial waste water to the pre-acidification tank, and then add a certain amount of cheese whey. Because the paper mill is far away from the dairy product processing and the road conditions make it inconvenient for pipeline transportation, it is transported to the paper mill by tank truck and from the pre-acidification tank. The lower end of the acidification tank is added, and the volume ratio of cheese whey to papermaking industrial wastewater is kept at 1:12, so that the nutrition of the wastewater system is balanced. The size of the pre-acidification tank is 1200m 3 . In order to mix the two evenly, a stir...

Embodiment 3

[0023]A method for promoting anaerobic reaction and inhibiting calcification by using whey pre-acid treatment of high-calcium papermaking industrial wastewater, the steps are: the pre-acid treatment in this embodiment is under laboratory conditions, and the TCOD of the mixed solution of the pre-acidification tank is 8000± 850mg / L, calcium ion concentration is 400mg / L, paper industry wastewater is taken from the factory. The wastewater is first added to the pre-acidification tank, and the cheese whey is taken out under refrigeration at 4°C and added to the pre-acidification tank. The volume ratio of cheese whey to paper industry wastewater reaches 1:15. In order to mix the two evenly, a stirring device is installed in the pre-acidification tank, the speed of the rotor is adjusted to 200r / min, the water temperature in the container is kept at room temperature, and NaOH is added to adjust the pH to keep the pH value of the solution at 6.9. The hydraulic retention time in the pre-...

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Abstract

The invention discloses a method for promoting anaerobic reaction and inhibiting calcification by pre-acidifying high-calcium papermaking industrial wastewater with whey. The method comprises the following steps: before carrying out anaerobic treatment on the papermaking industrial wastewater, mixing cheese whey with the papermaking industrial wastewater to carry out pre-acidification treatment onthe papermaking industrial wastewater. The method can be used for treating two kinds of high-concentration wastewater difficult to degrade at the same time; pretreatment with acidification is adoptedto allow the high-concentration wastewater to generate stable anaerobic reaction performance under the condition of a high organic load; the dynamic balance between acidification is ensured, the pH value is low and stable, the anaerobic reaction of the papermaking industry wastewater is promoted, the anaerobic methanogenesis efficiency of the wastewater is improved, and the serious calcium deposition phenomenon at the high pH value can be inhibited so as to effectively slow down the granular sludge calcification.

Description

technical field [0001] The invention belongs to the technical field of pulping and papermaking wastewater treatment in light industry technology, and specifically relates to a method for promoting anaerobic reaction and inhibiting calcification by using whey pre-acid to treat high-calcium papermaking industrial wastewater. Background technique [0002] In 2018, my country's total pulp consumption was 93.87 million tons, of which waste paper pulp was 54.74 million tons, accounting for 58%. It is the most important raw material for papermaking in my country, saving a lot of wood resources for our country and significantly reducing environmental pollution. Due to the addition of a large amount of filler CaCO in the papermaking process 3 , to reduce costs, improve paper opacity, improve paper smoothness and other properties, resulting in a large amount of calcium ions in the wastewater in the waste paper recycling process. During anaerobic treatment, calcium salts are deposited...

Claims

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Application Information

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IPC IPC(8): C02F9/14C02F3/34C02F1/66C02F101/10
CPCC02F3/34C02F3/28C02F1/66C02F2103/28C02F2209/02C02F2209/06C02F2201/4615C02F2101/10C02F2103/327C02F2001/5218Y02E50/30C02F1/68C02F2305/00
Inventor 王志伟刘辉李美玲武月茹王双飞张健
Owner GUANGXI UNIV
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