SU810617A1 - Method of aerobic stabilization of waste water sediments - Google Patents

Description

and technology for their further dehydration.

The disadvantages of this method are the considerable duration of the process (8-12 days) of aeration, which entails the need to use large amounts of stabilizers and, accordingly, considerable capital costs for their construction; In addition, as a result of the high coefficient of assimilation process in bacteria of activated sludge, a significant transition of the organic part of the sediment to the newly synthesized biomass of bacteria is observed, which ensures a decrease in the amount of sediment in the stabilization process by only 20-25%. Such a small decrease in the amount of sediment in the stabilization p-process requires BbrcoKiHx costs — on its further processing (dehydration on sludge sludge, wa.kuu {-filters, etc.).

The purpose of the invention is to reduce the duration of aeration and the amount of stabilized sludge.

This goal is achieved by the fact that aeration is carried out in the presence of decomposition of oxidative phosphorylation, as recommended by using 2,4 dinitrophenol or gossypol (2,2-di 8 (formyl-1,6,7-, 3 hydroxy-5 isopropyl- G: meth, yl) naphthalene) in an amount of 0.01-0.1% of the dry matter of the sediment.

The addition of an uncoupler increases the oxidative activity of sludge bacteria as a result of dissociation of the process of oxidative phosphorylation, which intensifies the process of aerobic stabilization of the sediment, i.e., reducing the duration of aeration by 1.5-1.9 times.

In addition, carrying out the process of aerating the mixture of activated sludge and sediment from primary sedimentation tanks in the presence of an isolator reduces the coefficient of assimilation in bacteria of the activated sludge as a result of a decrease in the phosphorylation rate, which leads to a decrease in the biomass of activated sludge bacteria during aerobic stabilization. Such a growth inhibition of biomass determines the decrease in the amount of sludge in the stabilization process and 35-50%, whereas with the known method, the amount of sludge in the stabilization process is reduced by only 20-25%, i.e., it reduces the amount of sediment in 1.25-1 , 5 times more than the known method. This effect of uncoupler reduces the cost of further sediment treatment by 25; -40% compared with the known method.

The fundamental difference between the proposed method and the one used at present is that

the reactor stabilizer reagent leads to the dissociation of the process of oxidative phosphorylation in bacteria of activated sludge, resulting in an intensification of the process is observed 1.5-1.9 times and, moreover, a decrease in the amount of sediment in the process of aeration 1.25-1.5 times , sm.m in a known way.

The method is carried out as follows:

Excessive activated sludge and raw sludge from primary sludges are mixed in a 1: 1 ratio, the resulting mixture, together with 1C uncoupler of oxidative phosphorylation, is fed into the reactor for aeration.

Example 1. The process of aerobic stabilization of a mixture of excess activated sludge and raw sludge from the primary sedimentation tanks in a 1: 1 ratio is carried out. After mixing, the precipitate is fed together with the added uncoupler of the oxidative phosphorus and release of 2,4-dinitrophenol (DNF) to the stabilizer reactor for aeration.

The sediment concentration in the stabilizer is 27-30 g / l dry matter, the air flow rate is 380-4) 20 m per 1 m of sediment. The temperature of the sludge during processing is 26–28 ° C. The process is monitored by the specific filtration resistance of the sludge, the initial level of which is 2000–4000 cm / g, the respiratory activity of bacteria sludge, chemical oxygen consumption, moisture of the sludge and its concentration in the reactor. When the specific solu- tions of sediment filtration are 50–40– 10 cm / g, the respiratory activity of the sludge bacteria reaches an endogenous level and stable values of chemical oxygen consumption of the sediment, the process is considered legitimate. The process of aerobic stabilization of the mixture of active sludge and raw sludge is carried out without additives and with the addition of DNF of different concentrations.

Example 2. Precess are similar to the first example. Goosipol is used as a disconnecting agent.

These examples are summarized in the table.

The table shows that as a result of the addition of the uncoupler of oxidative phosphorylation of DNF to the reactor stabilizer, gossypol there is a reduction in the stabilization time by 1.85 times and a decrease in the amount of sediment during its processing by 1.77 times, i.e. 1.4 times more than without the uncoupler.

Claims (2)

Using the proposed method of aerobic stabilization of sewage sludge provides, compared with the existing method, the following advantages: a) reducing the stabilization time by 1.5-1.9 times, which will reduce the stabilizer volume proportionally and thereby reduce the capital costs of their building. b) reducing the amount of sediment in the process of stabilization and 1.25-1.5 times, which will reduce the cost of further treatment of the sediment by 25-4-0%. The application of the proposed method will give an economic effect of 100-200 thousand rubles. per year (at reduced costs) when vacuum filters are used for sludge dewatering and thou. per year when using “left platforms with an artificial basis for the aeration station with a capacity of 500 thousand meters of wastewater per day. Claim 1. Method for aerobic stabilization of sewage sludge, comprising mixing excess active with sludge from primary settlers in a 1: 1 ratio and aerating the resulting mixture with subsequent dewatering of stabilized sludge, characterized in that in order to reduce the duration of aeration and the amount of stabilized sludge, aeration is carried out in the presence of oxidative phosphorylation uncoupler. 2. The method according to claim 1, characterized in that 2,4-dinitrophenol or gossypol in the amount of 0.01-0.1% of the dry matter of the sludge is used as an uncoupler of oxidative phosphorylation. Sources of information taken into account in the examination: 1. V. Chuprakova. Study of the process of aerobic digestion of sewage sludge. City sewers, scientific papers AKH RSFSR, № 77, 1970. 2. Yozher Olah. Evaluation of production experience in aerobic stabilization of activated sludge. Research results of water quality and hydrotechnology. Budapest, 1974, p. 211 (prototype).