Advanced Materials Research Vols. 374-377

Abstract: DAFF’s treatment effect on Yellow River reservoir water under different reflux ratios is studied in this paper. Determination of indicators are turbidity、COD_Mn、NH⁴⁺-N、UV₂₅₄、particle counter and unconventional indicators, such as biomass、TOC、olfactory threshold and smell of factors. The best reflux ratio is 14%; The average value of NH⁴⁺-N、COD_Mn 、UV₂₅₄、and turbidity of carbon-sand filter’s outlet is 0.125、1.61mg/L、0.033cm^-1 and 0.21NTU, accordingly, the average removal rates are 58.64 %、40.44 %、27.96 % and 90.26 %; The micro-organisms in filter material are mainly existed in the upper layer of activated carbon filter; The micro-organisms provide carbon-sand filter beneficial conditions for its biological degradation effect.

Abstract: To verify the feasibility of micro-filtration membrane process to treat the water treatment plants production wastewater, a submerged polypropylene membrane module was applied in a test pilot plant. It was found that membrane process had remarkable characteristics of stable operation, high water quality and the membrane module were needed to chemical medicine washing as trans-membrane pressure (TMP) to 36 Kpa after running across 41day. The operation cycle was the best period for 20 minutes (filter 18 minutes, backwash 2 minutes). Membrane filtration water was showed as turbidity of 0.1-0.2NTU, COD_Mn generally less than 3mg / L, COD_Mn removal efficiency of 60% -80%.^{Fe2 +}, Mn^{2 +},Al^{3 +} and THMFP of membrane filtration water were lower than the national drinking water health standards.

Abstract: Six water samples from different Yellow River reservoirs in Shandong were selected. The molecular weight distribution and type of organic matter were determined by using ultrafiltration, adsorption experiments and active bio-sand determination methods. The results show that the proportions of TOC and UV_{254Subscript text} in different molecular weight intervals and the type of organic matter are different. But the proportion of adsorbable dissolved organic matter is the largest, which is more than 80%.In addition, the proportion of biodegradable organic matter (BDOC) is little, so the biodegradability of the raw water is not high.

Abstract: The upflow biological aerated filter(UBAF) filled with grain slag was applied in Yellow River treatment. The aim is to study the reactor’s ability withstanding ammonia nitrogen volumetric loading in Yellow River water treatment. As influent NH₄⁺-N concentration increases from 0.2mg/L to 3.0mg/L, the average removal rate of turbidity, COD_Mn and NH₄^{+-N were 82%, 27% and 97% respectively, and removal of NH₄+-N occurs mainly in the filter layer depth changing from 150cm to 210cm. The nitrification performance improves when PO₄3- -P concentration in water reach 60μg/L, and the removal of NH₄+-N occurs mainly in the filter media layer depth shortened from 210cm to 90cm.}

Abstract: By changing the hydrogen peroxide and ozone dosage,the best dosage of hydrogen peroxide to catalyzed ozone- activated carbon-sand filtration process in purify Yellow River Water was found. When the same amount of hydrogen peroxide is filled into the three-level Ozone oxidation column, the combined process’s effect is best.The removal rates of TOC,UV₂₅₄,COD_Mn,Turbidity are 27.72%,58.66%,43.30% and 84.90%,the organic content is reduced in a large extent and the finished water quality is improved.

Abstract: Anaerobic hydrogen production in a continuous two-stage fermentation system was studied. Two continuously stirred tank reactors (CSTR) were employed to evaluate performances of the system. The first stage was fed with molasses wastewater, and the effluent discharged from the first stage was subsequently fed into the second stage. The hydrogen production rate (HPR) in the second stage achieved a remarkable increase from 1.76 L/d to 6.45 L/d during the operation by re-utilizing the residual substrates from the first reactor effluent. The two stages showed a similar metabolic pathway for biohydrogen fermentation. The hydrogen production yield (HY) and acidification efficiency increased markedly by more than 70% and 50% respectively, which indicated the hydrogen recovery and anaerobic acidification of organic substrates can be improved by the combined continuous two-stage hydrogen production process.

Abstract: Nitrate nitrogen in wastewater poses serious threat. D301f anion exchange resin can remove nitrate nitrogen in wastewater, its regeneration is one of the most important procedures, because regeneration efficiency has a direct impact on exchange capacity, water quality and regeneration agent consumption. D301f exchange resin column simulated nitrogen fertilizer plant wastewater (nitrate nitrogen300mg/L) for dynamic regeneration experiment. The results showed that, NH4OH regeneration agent dosage selected 3 to 4 times of theoretical amount more reasonable; regeneration solution concentration and temperature separately used 20% and 30°C better.

Abstract: Abstract. Dissolved Oxygen(DO) is one of the primary influencing factors in the system of short-cut nitrification, In order to find the appropriate DO concentration, in a stable SBR system, to simulate the sewage to treatment target, raction and stability of operation results of nitrification system was studied by changing the DO concentration. Experiments showed when the DO concentration <1mg/L time, the higher the DO concentration, the faster the rate of ammonia oxidation. To achieve the stable operation, the DO concentration must be strictly controlled in the reactor, too low or too high would undermine the stability of the system , the optimal range of DO concentration was0.5 ~ 0.7mg/L.

Abstract: Abstract. The paper aims to study the fast start-up of anaerobic-aerobic-anoxic-aerobic sequencing batch reactor, with domestic sewage as treating object, to solve the problem of SBR that can be used for denitrification or dephosphorization independently and to realize simultaneous nitrogen and phosphorus removal in a single SBR system. Phosphorus accumulating organisms were enriched at the anaerobic condition for 2h/aerobic for 3h after activated sludge were inoculated. Then denitrifying polyphosphate-accumulating organisms were enriched by inserting an anoxic phase into the aerobic phase. The lengths of anaerobic time, anoxic time and aerobic time were adjusted and the nitrogen and phosphorus removal effect of (AO)2SBR system were observed. The (AO)2SBR system was started successfully with 80d of training and domesticating. The nitrogen and phosphorus removal effect was performed preferably at the condition of anaerobic(2h)-aerobic(1.5h)-anoxic(1.5h)-aerobic(0.5h). The removal rate of COD, NH4+-N, TN and TP reached 90%, 97%, 88% and 92% respectively. And 33% of energy was saved when aerobic time was shortened from 3h to 2h, while the treating effect dropped off rarely. The results show that (AO)2SBR is applicable for simultaneous nitrogen and phosphorus removal, and the effluent water quality meets the first level B criteria specified in Discharge Standard of Pollutants for Municipal Wastewater Treatment Plant(GB 18918-2002). The system can also reach the aim of saving energy and providing theoretical basis for the nitrogen and phosphorus removal in single SBR systems.

Abstract: Under ultraviolet radiation, the photocatalytic degradation mechanism of Butyl enzyl phthalate ester (BBP) was studied with TiO₂ as the catalyst. As a result, BBP could be degraded efficiently, and the efficiency was 85% after 6h degradation. During the degradation process, the acidity of the degradation system changed obviously. The initial pH of the solution was 6.0, and it increased to 6.23 after 15min degradation, however it decreased to 3.89 after 6h degradation. Some photodegradation intermediates in the different photocatalytic steps were examined and analyzed by means of GC-MS. For the BBP, the photocatalytic degradation firstly reacted on the benzyloxy chain, and new material occured by the recomposition of the educts in the degradation.