SU956433A1 - Method for treating precipitate - Google Patents

Method for treating precipitate Download PDF

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Publication number
SU956433A1
SU956433A1 SU803258472A SU3258472A SU956433A1 SU 956433 A1 SU956433 A1 SU 956433A1 SU 803258472 A SU803258472 A SU 803258472A SU 3258472 A SU3258472 A SU 3258472A SU 956433 A1 SU956433 A1 SU 956433A1
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USSR - Soviet Union
Prior art keywords
sludge
treatment
reached
treating
precipitate
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SU803258472A
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Russian (ru)
Inventor
Виктор Владимирович Ковалев
Моисей Исаакович Банд
Эмануил Семенович Кандель
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Всесоюзный Проектно-Технологический Институт По Электробытовым Машинам И Приборам
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Priority to SU803258472A priority Critical patent/SU956433A1/en
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(54) СПОСОБ ОБРАБОТКИ ОСАДКА(54) METHOD FOR PROCESSING SEDIMENTS

Изобретение относитс  к способам обработки осадка, образующегос  при электрокоагул ционной очистке сточных вод от ионов т желых металлов   органи еск .их примесей (ПАВ, нефтепродукты и др.), и может ,быть использовано, например, при очистке стоков гальванического производства предпри тий машиностроени , цветной металлургии и т. д.The invention relates to methods for treating sludge formed during electrocoagulation sewage treatment from heavy metal ions of organic impurities (surfactants, oil products, etc.), and can be used, for example, in cleaning up drains of electroplating plants of mechanical engineering, non-ferrous metallurgy, etc.

Осадки, образующиес  при электрокоагул ционной очистке сточных вод от ионов т желых металлов и органических примесей, представл ют собой труднораздел емые суспензии гидроокисей металлов, влаж1ность которых, например, после отсто  в течение 6 ч составл ет в среднем 99,0- 99,5%. Обработка таких осадков представл ет собой сложный технологический процесс, включающий стадии кондиционировани , уплотнени  и обезвоживани .The sediments formed during the electrocoagulation treatment of waste water from heavy metal ions and organic impurities are difficult to separate by suspensions of metal hydroxides, the moisture content of which, for example, after settling for 6 hours, is on average 99.0- 99.5% . The treatment of such sediments is a complex process involving the stages of conditioning, compaction and dewatering.

Известен способ обработки (т. е. улучшени  водоотвод щих свойств) осадков путем их реагентной обработки коагул нтами и флокул нтами 1. Однако этот способ св зан с использованием дефицитных и дорогосто щих реагентов и, кроме того, недостаточно эффективен в случае осадков, образующихс  ири электрокоагул ционной очистке сточных вод.A known method of treating (i.e., improving the drainage properties) of sediments by reagent treatment of them with coagulants and flocculants 1. However, this method is associated with the use of scarce and expensive reagents and, moreover, is not sufficiently effective in the case of precipitation resulting from electrocoagulation wastewater treatment.

Наиболее близки)м по технической сущности и достигаемому результату к предлагаемому способу  вл етс  способ обработки осадка, образующегос  при электро5 коагул ционной очистке стоганых вод, заключающийс  в последовательной обработке осадка сол ной кислотой и щелочью 2.The closest to the technical essence and the achieved result to the proposed method is a method of treating the sludge formed during the electro-coagulation purification of the stacked waters, which consists in the sequential treatment of the sludge with hydrochloric acid and alkali 2.

Недостатком этого способа  вл етс  10 сложность эксплуатации реагентов, приготовлени  и дозировани  ра1боч;их растворов в кислоты и щелочи.The disadvantage of this method is the difficulty of 10 operating reagents, preparing and dispensing workers, their solutions in acids and alkalis.

Целью изобретени   вл етс  уменьшение объема осадка   упрощение процесса.The aim of the invention is to reduce the volume of sediment to simplify the process.

1515

Поставленна  цель дости1гаетс  тем, что обработку осадка, образующегос  при электрокоагул ционной очистке сточных вод от ионов т желых металлов и органических примесей, ведут последователь20 но сначала в анодной, а затем в катодной камерах аиафрагменного электролизера с использованием нерастворимых электродов при плотности тока 2-3 А/дм и напр женности электрического пол  500- 25 1500 В/м, причем обработку осадка в .аиодной камере ведут до достижени  значени  рН 4,0-5,0, а в катодной камере - до достижени  (Значени  рН 9,0-9,5.This goal is achieved by the treatment of sludge formed during electrocoagulation sewage purification from heavy metal ions and organic impurities, followed, first, in the anodic and then in the cathode chambers of the aiaphragm electrolyzer using insoluble electrodes at a current density of 2-3 A / dm and an electric field strength of 500–25 to 1500 V / m, and the sludge is treated in the ion chamber until a pH value of 4.0-5.0 is reached, and in a cathode chamber - until it is reached (pH value 9.0-9 ,five.

При такой обработке происходит агре30 гирование частлц осадка как под вли ниемUnder such treatment, aggregation of the sediment particles as under the influence of

Claims (1)

Формула изобретенияClaim Способ обработки осадка, образующегося при электрокоагуляционной очистке сточных вод, содержащих ионы тяжелых металлов и органические примеси, отличающийся тем, что, с целью уменьшения объема- осадка за счет увеличения степени уплотнения, обработку осадка ведут последовательно в анодной и катодной ка„ мерах диафрагменного электролизера с использованием нерастворимых электродов при плотности тока 2—3 А/дм2 и напряженности электрического поля 500—1500 В/м, причем обработку осадка в анодной камере ведут до достижения значения pH 4,0—5,0, а в катодной камере — до достижения значения pH 9,0—9,5.A method of treating sludge generated during electrocoagulation wastewater treatment containing heavy metal ions and organic impurities, characterized in that, in order to reduce the sludge volume by increasing the degree of compaction, the sludge is treated sequentially in the anode and cathode chambers of a diaphragm electrolyzer with using insoluble electrodes at a current density of 2-3 A / dm 2 and an electric field strength of 500-1500 V / m, and the treatment of the precipitate in the anode chamber is carried out until a pH of 4.0-5.0 is reached, and in to the same chamber — until a pH of 9.0–9.5 is reached.
SU803258472A 1980-12-17 1980-12-17 Method for treating precipitate SU956433A1 (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5047126A (en) * 1989-04-19 1991-09-10 Bernard Greenberg Method for recovering metal from waste stream

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5047126A (en) * 1989-04-19 1991-09-10 Bernard Greenberg Method for recovering metal from waste stream

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